Subnets

IPv6 subnet calculator

Enter an IPv6 address with a prefix. Any notation works: compressed with ::, fully written out, with an embedded IPv4 address or a zone such as %eth0.

Network bits are blue, host bits are amber. Click any bit to move the boundary.

Result

Address: 2001:db8:abcd:12::1
Full form: 2001:0db8:abcd:0012:0000:0000:0000:0001
Network: 2001:db8:abcd::/48
Prefix mask: ffff:ffff:ffff::
First address: 2001:db8:abcd::
Last address: 2001:db8:abcd:ffff:ffff:ffff:ffff:ffff
Total addresses: 2^80 = 1,208,925,819,614,629,174,706,176
/64 subnets: 65,536
Address type: Documentation (2001:db8::/32)
Reverse DNS zone: d.c.b.a.8.b.d.0.1.0.0.2.ip6.arpa
PTR record name: 1.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.2.1.0.0.d.c.b.a.8.b.d.0.1.0.0.2.ip6.arpa

Split into subnets

Subnet size

256 subnets

1	2001:db8:abcd::/56	2001:db8:abcd:: – 2001:db8:abcd:ff:ffff:ffff:ffff:ffff
2	2001:db8:abcd:100::/56	2001:db8:abcd:100:: – 2001:db8:abcd:1ff:ffff:ffff:ffff:ffff
3	2001:db8:abcd:200::/56	2001:db8:abcd:200:: – 2001:db8:abcd:2ff:ffff:ffff:ffff:ffff
4	2001:db8:abcd:300::/56	2001:db8:abcd:300:: – 2001:db8:abcd:3ff:ffff:ffff:ffff:ffff
5	2001:db8:abcd:400::/56	2001:db8:abcd:400:: – 2001:db8:abcd:4ff:ffff:ffff:ffff:ffff
6	2001:db8:abcd:500::/56	2001:db8:abcd:500:: – 2001:db8:abcd:5ff:ffff:ffff:ffff:ffff
7	2001:db8:abcd:600::/56	2001:db8:abcd:600:: – 2001:db8:abcd:6ff:ffff:ffff:ffff:ffff
8	2001:db8:abcd:700::/56	2001:db8:abcd:700:: – 2001:db8:abcd:7ff:ffff:ffff:ffff:ffff
9	2001:db8:abcd:800::/56	2001:db8:abcd:800:: – 2001:db8:abcd:8ff:ffff:ffff:ffff:ffff
10	2001:db8:abcd:900::/56	2001:db8:abcd:900:: – 2001:db8:abcd:9ff:ffff:ffff:ffff:ffff
11	2001:db8:abcd:a00::/56	2001:db8:abcd:a00:: – 2001:db8:abcd:aff:ffff:ffff:ffff:ffff
12	2001:db8:abcd:b00::/56	2001:db8:abcd:b00:: – 2001:db8:abcd:bff:ffff:ffff:ffff:ffff
13	2001:db8:abcd:c00::/56	2001:db8:abcd:c00:: – 2001:db8:abcd:cff:ffff:ffff:ffff:ffff
14	2001:db8:abcd:d00::/56	2001:db8:abcd:d00:: – 2001:db8:abcd:dff:ffff:ffff:ffff:ffff
15	2001:db8:abcd:e00::/56	2001:db8:abcd:e00:: – 2001:db8:abcd:eff:ffff:ffff:ffff:ffff
16	2001:db8:abcd:f00::/56	2001:db8:abcd:f00:: – 2001:db8:abcd:fff:ffff:ffff:ffff:ffff
17	2001:db8:abcd:1000::/56	2001:db8:abcd:1000:: – 2001:db8:abcd:10ff:ffff:ffff:ffff:ffff
18	2001:db8:abcd:1100::/56	2001:db8:abcd:1100:: – 2001:db8:abcd:11ff:ffff:ffff:ffff:ffff
19	2001:db8:abcd:1200::/56	2001:db8:abcd:1200:: – 2001:db8:abcd:12ff:ffff:ffff:ffff:ffff
20	2001:db8:abcd:1300::/56	2001:db8:abcd:1300:: – 2001:db8:abcd:13ff:ffff:ffff:ffff:ffff
21	2001:db8:abcd:1400::/56	2001:db8:abcd:1400:: – 2001:db8:abcd:14ff:ffff:ffff:ffff:ffff
22	2001:db8:abcd:1500::/56	2001:db8:abcd:1500:: – 2001:db8:abcd:15ff:ffff:ffff:ffff:ffff
23	2001:db8:abcd:1600::/56	2001:db8:abcd:1600:: – 2001:db8:abcd:16ff:ffff:ffff:ffff:ffff
24	2001:db8:abcd:1700::/56	2001:db8:abcd:1700:: – 2001:db8:abcd:17ff:ffff:ffff:ffff:ffff
25	2001:db8:abcd:1800::/56	2001:db8:abcd:1800:: – 2001:db8:abcd:18ff:ffff:ffff:ffff:ffff
26	2001:db8:abcd:1900::/56	2001:db8:abcd:1900:: – 2001:db8:abcd:19ff:ffff:ffff:ffff:ffff
27	2001:db8:abcd:1a00::/56	2001:db8:abcd:1a00:: – 2001:db8:abcd:1aff:ffff:ffff:ffff:ffff
28	2001:db8:abcd:1b00::/56	2001:db8:abcd:1b00:: – 2001:db8:abcd:1bff:ffff:ffff:ffff:ffff
29	2001:db8:abcd:1c00::/56	2001:db8:abcd:1c00:: – 2001:db8:abcd:1cff:ffff:ffff:ffff:ffff
30	2001:db8:abcd:1d00::/56	2001:db8:abcd:1d00:: – 2001:db8:abcd:1dff:ffff:ffff:ffff:ffff
31	2001:db8:abcd:1e00::/56	2001:db8:abcd:1e00:: – 2001:db8:abcd:1eff:ffff:ffff:ffff:ffff
32	2001:db8:abcd:1f00::/56	2001:db8:abcd:1f00:: – 2001:db8:abcd:1fff:ffff:ffff:ffff:ffff
33	2001:db8:abcd:2000::/56	2001:db8:abcd:2000:: – 2001:db8:abcd:20ff:ffff:ffff:ffff:ffff
34	2001:db8:abcd:2100::/56	2001:db8:abcd:2100:: – 2001:db8:abcd:21ff:ffff:ffff:ffff:ffff
35	2001:db8:abcd:2200::/56	2001:db8:abcd:2200:: – 2001:db8:abcd:22ff:ffff:ffff:ffff:ffff
36	2001:db8:abcd:2300::/56	2001:db8:abcd:2300:: – 2001:db8:abcd:23ff:ffff:ffff:ffff:ffff
37	2001:db8:abcd:2400::/56	2001:db8:abcd:2400:: – 2001:db8:abcd:24ff:ffff:ffff:ffff:ffff
38	2001:db8:abcd:2500::/56	2001:db8:abcd:2500:: – 2001:db8:abcd:25ff:ffff:ffff:ffff:ffff
39	2001:db8:abcd:2600::/56	2001:db8:abcd:2600:: – 2001:db8:abcd:26ff:ffff:ffff:ffff:ffff
40	2001:db8:abcd:2700::/56	2001:db8:abcd:2700:: – 2001:db8:abcd:27ff:ffff:ffff:ffff:ffff
41	2001:db8:abcd:2800::/56	2001:db8:abcd:2800:: – 2001:db8:abcd:28ff:ffff:ffff:ffff:ffff
42	2001:db8:abcd:2900::/56	2001:db8:abcd:2900:: – 2001:db8:abcd:29ff:ffff:ffff:ffff:ffff
43	2001:db8:abcd:2a00::/56	2001:db8:abcd:2a00:: – 2001:db8:abcd:2aff:ffff:ffff:ffff:ffff
44	2001:db8:abcd:2b00::/56	2001:db8:abcd:2b00:: – 2001:db8:abcd:2bff:ffff:ffff:ffff:ffff
45	2001:db8:abcd:2c00::/56	2001:db8:abcd:2c00:: – 2001:db8:abcd:2cff:ffff:ffff:ffff:ffff
46	2001:db8:abcd:2d00::/56	2001:db8:abcd:2d00:: – 2001:db8:abcd:2dff:ffff:ffff:ffff:ffff
47	2001:db8:abcd:2e00::/56	2001:db8:abcd:2e00:: – 2001:db8:abcd:2eff:ffff:ffff:ffff:ffff
48	2001:db8:abcd:2f00::/56	2001:db8:abcd:2f00:: – 2001:db8:abcd:2fff:ffff:ffff:ffff:ffff
49	2001:db8:abcd:3000::/56	2001:db8:abcd:3000:: – 2001:db8:abcd:30ff:ffff:ffff:ffff:ffff
50	2001:db8:abcd:3100::/56	2001:db8:abcd:3100:: – 2001:db8:abcd:31ff:ffff:ffff:ffff:ffff
51	2001:db8:abcd:3200::/56	2001:db8:abcd:3200:: – 2001:db8:abcd:32ff:ffff:ffff:ffff:ffff
52	2001:db8:abcd:3300::/56	2001:db8:abcd:3300:: – 2001:db8:abcd:33ff:ffff:ffff:ffff:ffff
53	2001:db8:abcd:3400::/56	2001:db8:abcd:3400:: – 2001:db8:abcd:34ff:ffff:ffff:ffff:ffff
54	2001:db8:abcd:3500::/56	2001:db8:abcd:3500:: – 2001:db8:abcd:35ff:ffff:ffff:ffff:ffff
55	2001:db8:abcd:3600::/56	2001:db8:abcd:3600:: – 2001:db8:abcd:36ff:ffff:ffff:ffff:ffff
56	2001:db8:abcd:3700::/56	2001:db8:abcd:3700:: – 2001:db8:abcd:37ff:ffff:ffff:ffff:ffff
57	2001:db8:abcd:3800::/56	2001:db8:abcd:3800:: – 2001:db8:abcd:38ff:ffff:ffff:ffff:ffff
58	2001:db8:abcd:3900::/56	2001:db8:abcd:3900:: – 2001:db8:abcd:39ff:ffff:ffff:ffff:ffff
59	2001:db8:abcd:3a00::/56	2001:db8:abcd:3a00:: – 2001:db8:abcd:3aff:ffff:ffff:ffff:ffff
60	2001:db8:abcd:3b00::/56	2001:db8:abcd:3b00:: – 2001:db8:abcd:3bff:ffff:ffff:ffff:ffff
61	2001:db8:abcd:3c00::/56	2001:db8:abcd:3c00:: – 2001:db8:abcd:3cff:ffff:ffff:ffff:ffff
62	2001:db8:abcd:3d00::/56	2001:db8:abcd:3d00:: – 2001:db8:abcd:3dff:ffff:ffff:ffff:ffff
63	2001:db8:abcd:3e00::/56	2001:db8:abcd:3e00:: – 2001:db8:abcd:3eff:ffff:ffff:ffff:ffff
64	2001:db8:abcd:3f00::/56	2001:db8:abcd:3f00:: – 2001:db8:abcd:3fff:ffff:ffff:ffff:ffff
65	2001:db8:abcd:4000::/56	2001:db8:abcd:4000:: – 2001:db8:abcd:40ff:ffff:ffff:ffff:ffff
66	2001:db8:abcd:4100::/56	2001:db8:abcd:4100:: – 2001:db8:abcd:41ff:ffff:ffff:ffff:ffff
67	2001:db8:abcd:4200::/56	2001:db8:abcd:4200:: – 2001:db8:abcd:42ff:ffff:ffff:ffff:ffff
68	2001:db8:abcd:4300::/56	2001:db8:abcd:4300:: – 2001:db8:abcd:43ff:ffff:ffff:ffff:ffff
69	2001:db8:abcd:4400::/56	2001:db8:abcd:4400:: – 2001:db8:abcd:44ff:ffff:ffff:ffff:ffff
70	2001:db8:abcd:4500::/56	2001:db8:abcd:4500:: – 2001:db8:abcd:45ff:ffff:ffff:ffff:ffff
71	2001:db8:abcd:4600::/56	2001:db8:abcd:4600:: – 2001:db8:abcd:46ff:ffff:ffff:ffff:ffff
72	2001:db8:abcd:4700::/56	2001:db8:abcd:4700:: – 2001:db8:abcd:47ff:ffff:ffff:ffff:ffff
73	2001:db8:abcd:4800::/56	2001:db8:abcd:4800:: – 2001:db8:abcd:48ff:ffff:ffff:ffff:ffff
74	2001:db8:abcd:4900::/56	2001:db8:abcd:4900:: – 2001:db8:abcd:49ff:ffff:ffff:ffff:ffff
75	2001:db8:abcd:4a00::/56	2001:db8:abcd:4a00:: – 2001:db8:abcd:4aff:ffff:ffff:ffff:ffff
76	2001:db8:abcd:4b00::/56	2001:db8:abcd:4b00:: – 2001:db8:abcd:4bff:ffff:ffff:ffff:ffff
77	2001:db8:abcd:4c00::/56	2001:db8:abcd:4c00:: – 2001:db8:abcd:4cff:ffff:ffff:ffff:ffff
78	2001:db8:abcd:4d00::/56	2001:db8:abcd:4d00:: – 2001:db8:abcd:4dff:ffff:ffff:ffff:ffff
79	2001:db8:abcd:4e00::/56	2001:db8:abcd:4e00:: – 2001:db8:abcd:4eff:ffff:ffff:ffff:ffff
80	2001:db8:abcd:4f00::/56	2001:db8:abcd:4f00:: – 2001:db8:abcd:4fff:ffff:ffff:ffff:ffff
81	2001:db8:abcd:5000::/56	2001:db8:abcd:5000:: – 2001:db8:abcd:50ff:ffff:ffff:ffff:ffff
82	2001:db8:abcd:5100::/56	2001:db8:abcd:5100:: – 2001:db8:abcd:51ff:ffff:ffff:ffff:ffff
83	2001:db8:abcd:5200::/56	2001:db8:abcd:5200:: – 2001:db8:abcd:52ff:ffff:ffff:ffff:ffff
84	2001:db8:abcd:5300::/56	2001:db8:abcd:5300:: – 2001:db8:abcd:53ff:ffff:ffff:ffff:ffff
85	2001:db8:abcd:5400::/56	2001:db8:abcd:5400:: – 2001:db8:abcd:54ff:ffff:ffff:ffff:ffff
86	2001:db8:abcd:5500::/56	2001:db8:abcd:5500:: – 2001:db8:abcd:55ff:ffff:ffff:ffff:ffff
87	2001:db8:abcd:5600::/56	2001:db8:abcd:5600:: – 2001:db8:abcd:56ff:ffff:ffff:ffff:ffff
88	2001:db8:abcd:5700::/56	2001:db8:abcd:5700:: – 2001:db8:abcd:57ff:ffff:ffff:ffff:ffff
89	2001:db8:abcd:5800::/56	2001:db8:abcd:5800:: – 2001:db8:abcd:58ff:ffff:ffff:ffff:ffff
90	2001:db8:abcd:5900::/56	2001:db8:abcd:5900:: – 2001:db8:abcd:59ff:ffff:ffff:ffff:ffff
91	2001:db8:abcd:5a00::/56	2001:db8:abcd:5a00:: – 2001:db8:abcd:5aff:ffff:ffff:ffff:ffff
92	2001:db8:abcd:5b00::/56	2001:db8:abcd:5b00:: – 2001:db8:abcd:5bff:ffff:ffff:ffff:ffff
93	2001:db8:abcd:5c00::/56	2001:db8:abcd:5c00:: – 2001:db8:abcd:5cff:ffff:ffff:ffff:ffff
94	2001:db8:abcd:5d00::/56	2001:db8:abcd:5d00:: – 2001:db8:abcd:5dff:ffff:ffff:ffff:ffff
95	2001:db8:abcd:5e00::/56	2001:db8:abcd:5e00:: – 2001:db8:abcd:5eff:ffff:ffff:ffff:ffff
96	2001:db8:abcd:5f00::/56	2001:db8:abcd:5f00:: – 2001:db8:abcd:5fff:ffff:ffff:ffff:ffff
97	2001:db8:abcd:6000::/56	2001:db8:abcd:6000:: – 2001:db8:abcd:60ff:ffff:ffff:ffff:ffff
98	2001:db8:abcd:6100::/56	2001:db8:abcd:6100:: – 2001:db8:abcd:61ff:ffff:ffff:ffff:ffff
99	2001:db8:abcd:6200::/56	2001:db8:abcd:6200:: – 2001:db8:abcd:62ff:ffff:ffff:ffff:ffff
100	2001:db8:abcd:6300::/56	2001:db8:abcd:6300:: – 2001:db8:abcd:63ff:ffff:ffff:ffff:ffff
101	2001:db8:abcd:6400::/56	2001:db8:abcd:6400:: – 2001:db8:abcd:64ff:ffff:ffff:ffff:ffff
102	2001:db8:abcd:6500::/56	2001:db8:abcd:6500:: – 2001:db8:abcd:65ff:ffff:ffff:ffff:ffff
103	2001:db8:abcd:6600::/56	2001:db8:abcd:6600:: – 2001:db8:abcd:66ff:ffff:ffff:ffff:ffff
104	2001:db8:abcd:6700::/56	2001:db8:abcd:6700:: – 2001:db8:abcd:67ff:ffff:ffff:ffff:ffff
105	2001:db8:abcd:6800::/56	2001:db8:abcd:6800:: – 2001:db8:abcd:68ff:ffff:ffff:ffff:ffff
106	2001:db8:abcd:6900::/56	2001:db8:abcd:6900:: – 2001:db8:abcd:69ff:ffff:ffff:ffff:ffff
107	2001:db8:abcd:6a00::/56	2001:db8:abcd:6a00:: – 2001:db8:abcd:6aff:ffff:ffff:ffff:ffff
108	2001:db8:abcd:6b00::/56	2001:db8:abcd:6b00:: – 2001:db8:abcd:6bff:ffff:ffff:ffff:ffff
109	2001:db8:abcd:6c00::/56	2001:db8:abcd:6c00:: – 2001:db8:abcd:6cff:ffff:ffff:ffff:ffff
110	2001:db8:abcd:6d00::/56	2001:db8:abcd:6d00:: – 2001:db8:abcd:6dff:ffff:ffff:ffff:ffff
111	2001:db8:abcd:6e00::/56	2001:db8:abcd:6e00:: – 2001:db8:abcd:6eff:ffff:ffff:ffff:ffff
112	2001:db8:abcd:6f00::/56	2001:db8:abcd:6f00:: – 2001:db8:abcd:6fff:ffff:ffff:ffff:ffff
113	2001:db8:abcd:7000::/56	2001:db8:abcd:7000:: – 2001:db8:abcd:70ff:ffff:ffff:ffff:ffff
114	2001:db8:abcd:7100::/56	2001:db8:abcd:7100:: – 2001:db8:abcd:71ff:ffff:ffff:ffff:ffff
115	2001:db8:abcd:7200::/56	2001:db8:abcd:7200:: – 2001:db8:abcd:72ff:ffff:ffff:ffff:ffff
116	2001:db8:abcd:7300::/56	2001:db8:abcd:7300:: – 2001:db8:abcd:73ff:ffff:ffff:ffff:ffff
117	2001:db8:abcd:7400::/56	2001:db8:abcd:7400:: – 2001:db8:abcd:74ff:ffff:ffff:ffff:ffff
118	2001:db8:abcd:7500::/56	2001:db8:abcd:7500:: – 2001:db8:abcd:75ff:ffff:ffff:ffff:ffff
119	2001:db8:abcd:7600::/56	2001:db8:abcd:7600:: – 2001:db8:abcd:76ff:ffff:ffff:ffff:ffff
120	2001:db8:abcd:7700::/56	2001:db8:abcd:7700:: – 2001:db8:abcd:77ff:ffff:ffff:ffff:ffff
121	2001:db8:abcd:7800::/56	2001:db8:abcd:7800:: – 2001:db8:abcd:78ff:ffff:ffff:ffff:ffff
122	2001:db8:abcd:7900::/56	2001:db8:abcd:7900:: – 2001:db8:abcd:79ff:ffff:ffff:ffff:ffff
123	2001:db8:abcd:7a00::/56	2001:db8:abcd:7a00:: – 2001:db8:abcd:7aff:ffff:ffff:ffff:ffff
124	2001:db8:abcd:7b00::/56	2001:db8:abcd:7b00:: – 2001:db8:abcd:7bff:ffff:ffff:ffff:ffff
125	2001:db8:abcd:7c00::/56	2001:db8:abcd:7c00:: – 2001:db8:abcd:7cff:ffff:ffff:ffff:ffff
126	2001:db8:abcd:7d00::/56	2001:db8:abcd:7d00:: – 2001:db8:abcd:7dff:ffff:ffff:ffff:ffff
127	2001:db8:abcd:7e00::/56	2001:db8:abcd:7e00:: – 2001:db8:abcd:7eff:ffff:ffff:ffff:ffff
128	2001:db8:abcd:7f00::/56	2001:db8:abcd:7f00:: – 2001:db8:abcd:7fff:ffff:ffff:ffff:ffff
129	2001:db8:abcd:8000::/56	2001:db8:abcd:8000:: – 2001:db8:abcd:80ff:ffff:ffff:ffff:ffff
130	2001:db8:abcd:8100::/56	2001:db8:abcd:8100:: – 2001:db8:abcd:81ff:ffff:ffff:ffff:ffff
131	2001:db8:abcd:8200::/56	2001:db8:abcd:8200:: – 2001:db8:abcd:82ff:ffff:ffff:ffff:ffff
132	2001:db8:abcd:8300::/56	2001:db8:abcd:8300:: – 2001:db8:abcd:83ff:ffff:ffff:ffff:ffff
133	2001:db8:abcd:8400::/56	2001:db8:abcd:8400:: – 2001:db8:abcd:84ff:ffff:ffff:ffff:ffff
134	2001:db8:abcd:8500::/56	2001:db8:abcd:8500:: – 2001:db8:abcd:85ff:ffff:ffff:ffff:ffff
135	2001:db8:abcd:8600::/56	2001:db8:abcd:8600:: – 2001:db8:abcd:86ff:ffff:ffff:ffff:ffff
136	2001:db8:abcd:8700::/56	2001:db8:abcd:8700:: – 2001:db8:abcd:87ff:ffff:ffff:ffff:ffff
137	2001:db8:abcd:8800::/56	2001:db8:abcd:8800:: – 2001:db8:abcd:88ff:ffff:ffff:ffff:ffff
138	2001:db8:abcd:8900::/56	2001:db8:abcd:8900:: – 2001:db8:abcd:89ff:ffff:ffff:ffff:ffff
139	2001:db8:abcd:8a00::/56	2001:db8:abcd:8a00:: – 2001:db8:abcd:8aff:ffff:ffff:ffff:ffff
140	2001:db8:abcd:8b00::/56	2001:db8:abcd:8b00:: – 2001:db8:abcd:8bff:ffff:ffff:ffff:ffff
141	2001:db8:abcd:8c00::/56	2001:db8:abcd:8c00:: – 2001:db8:abcd:8cff:ffff:ffff:ffff:ffff
142	2001:db8:abcd:8d00::/56	2001:db8:abcd:8d00:: – 2001:db8:abcd:8dff:ffff:ffff:ffff:ffff
143	2001:db8:abcd:8e00::/56	2001:db8:abcd:8e00:: – 2001:db8:abcd:8eff:ffff:ffff:ffff:ffff
144	2001:db8:abcd:8f00::/56	2001:db8:abcd:8f00:: – 2001:db8:abcd:8fff:ffff:ffff:ffff:ffff
145	2001:db8:abcd:9000::/56	2001:db8:abcd:9000:: – 2001:db8:abcd:90ff:ffff:ffff:ffff:ffff
146	2001:db8:abcd:9100::/56	2001:db8:abcd:9100:: – 2001:db8:abcd:91ff:ffff:ffff:ffff:ffff
147	2001:db8:abcd:9200::/56	2001:db8:abcd:9200:: – 2001:db8:abcd:92ff:ffff:ffff:ffff:ffff
148	2001:db8:abcd:9300::/56	2001:db8:abcd:9300:: – 2001:db8:abcd:93ff:ffff:ffff:ffff:ffff
149	2001:db8:abcd:9400::/56	2001:db8:abcd:9400:: – 2001:db8:abcd:94ff:ffff:ffff:ffff:ffff
150	2001:db8:abcd:9500::/56	2001:db8:abcd:9500:: – 2001:db8:abcd:95ff:ffff:ffff:ffff:ffff
151	2001:db8:abcd:9600::/56	2001:db8:abcd:9600:: – 2001:db8:abcd:96ff:ffff:ffff:ffff:ffff
152	2001:db8:abcd:9700::/56	2001:db8:abcd:9700:: – 2001:db8:abcd:97ff:ffff:ffff:ffff:ffff
153	2001:db8:abcd:9800::/56	2001:db8:abcd:9800:: – 2001:db8:abcd:98ff:ffff:ffff:ffff:ffff
154	2001:db8:abcd:9900::/56	2001:db8:abcd:9900:: – 2001:db8:abcd:99ff:ffff:ffff:ffff:ffff
155	2001:db8:abcd:9a00::/56	2001:db8:abcd:9a00:: – 2001:db8:abcd:9aff:ffff:ffff:ffff:ffff
156	2001:db8:abcd:9b00::/56	2001:db8:abcd:9b00:: – 2001:db8:abcd:9bff:ffff:ffff:ffff:ffff
157	2001:db8:abcd:9c00::/56	2001:db8:abcd:9c00:: – 2001:db8:abcd:9cff:ffff:ffff:ffff:ffff
158	2001:db8:abcd:9d00::/56	2001:db8:abcd:9d00:: – 2001:db8:abcd:9dff:ffff:ffff:ffff:ffff
159	2001:db8:abcd:9e00::/56	2001:db8:abcd:9e00:: – 2001:db8:abcd:9eff:ffff:ffff:ffff:ffff
160	2001:db8:abcd:9f00::/56	2001:db8:abcd:9f00:: – 2001:db8:abcd:9fff:ffff:ffff:ffff:ffff
161	2001:db8:abcd:a000::/56	2001:db8:abcd:a000:: – 2001:db8:abcd:a0ff:ffff:ffff:ffff:ffff
162	2001:db8:abcd:a100::/56	2001:db8:abcd:a100:: – 2001:db8:abcd:a1ff:ffff:ffff:ffff:ffff
163	2001:db8:abcd:a200::/56	2001:db8:abcd:a200:: – 2001:db8:abcd:a2ff:ffff:ffff:ffff:ffff
164	2001:db8:abcd:a300::/56	2001:db8:abcd:a300:: – 2001:db8:abcd:a3ff:ffff:ffff:ffff:ffff
165	2001:db8:abcd:a400::/56	2001:db8:abcd:a400:: – 2001:db8:abcd:a4ff:ffff:ffff:ffff:ffff
166	2001:db8:abcd:a500::/56	2001:db8:abcd:a500:: – 2001:db8:abcd:a5ff:ffff:ffff:ffff:ffff
167	2001:db8:abcd:a600::/56	2001:db8:abcd:a600:: – 2001:db8:abcd:a6ff:ffff:ffff:ffff:ffff
168	2001:db8:abcd:a700::/56	2001:db8:abcd:a700:: – 2001:db8:abcd:a7ff:ffff:ffff:ffff:ffff
169	2001:db8:abcd:a800::/56	2001:db8:abcd:a800:: – 2001:db8:abcd:a8ff:ffff:ffff:ffff:ffff
170	2001:db8:abcd:a900::/56	2001:db8:abcd:a900:: – 2001:db8:abcd:a9ff:ffff:ffff:ffff:ffff
171	2001:db8:abcd:aa00::/56	2001:db8:abcd:aa00:: – 2001:db8:abcd:aaff:ffff:ffff:ffff:ffff
172	2001:db8:abcd:ab00::/56	2001:db8:abcd:ab00:: – 2001:db8:abcd:abff:ffff:ffff:ffff:ffff
173	2001:db8:abcd:ac00::/56	2001:db8:abcd:ac00:: – 2001:db8:abcd:acff:ffff:ffff:ffff:ffff
174	2001:db8:abcd:ad00::/56	2001:db8:abcd:ad00:: – 2001:db8:abcd:adff:ffff:ffff:ffff:ffff
175	2001:db8:abcd:ae00::/56	2001:db8:abcd:ae00:: – 2001:db8:abcd:aeff:ffff:ffff:ffff:ffff
176	2001:db8:abcd:af00::/56	2001:db8:abcd:af00:: – 2001:db8:abcd:afff:ffff:ffff:ffff:ffff
177	2001:db8:abcd:b000::/56	2001:db8:abcd:b000:: – 2001:db8:abcd:b0ff:ffff:ffff:ffff:ffff
178	2001:db8:abcd:b100::/56	2001:db8:abcd:b100:: – 2001:db8:abcd:b1ff:ffff:ffff:ffff:ffff
179	2001:db8:abcd:b200::/56	2001:db8:abcd:b200:: – 2001:db8:abcd:b2ff:ffff:ffff:ffff:ffff
180	2001:db8:abcd:b300::/56	2001:db8:abcd:b300:: – 2001:db8:abcd:b3ff:ffff:ffff:ffff:ffff
181	2001:db8:abcd:b400::/56	2001:db8:abcd:b400:: – 2001:db8:abcd:b4ff:ffff:ffff:ffff:ffff
182	2001:db8:abcd:b500::/56	2001:db8:abcd:b500:: – 2001:db8:abcd:b5ff:ffff:ffff:ffff:ffff
183	2001:db8:abcd:b600::/56	2001:db8:abcd:b600:: – 2001:db8:abcd:b6ff:ffff:ffff:ffff:ffff
184	2001:db8:abcd:b700::/56	2001:db8:abcd:b700:: – 2001:db8:abcd:b7ff:ffff:ffff:ffff:ffff
185	2001:db8:abcd:b800::/56	2001:db8:abcd:b800:: – 2001:db8:abcd:b8ff:ffff:ffff:ffff:ffff
186	2001:db8:abcd:b900::/56	2001:db8:abcd:b900:: – 2001:db8:abcd:b9ff:ffff:ffff:ffff:ffff
187	2001:db8:abcd:ba00::/56	2001:db8:abcd:ba00:: – 2001:db8:abcd:baff:ffff:ffff:ffff:ffff
188	2001:db8:abcd:bb00::/56	2001:db8:abcd:bb00:: – 2001:db8:abcd:bbff:ffff:ffff:ffff:ffff
189	2001:db8:abcd:bc00::/56	2001:db8:abcd:bc00:: – 2001:db8:abcd:bcff:ffff:ffff:ffff:ffff
190	2001:db8:abcd:bd00::/56	2001:db8:abcd:bd00:: – 2001:db8:abcd:bdff:ffff:ffff:ffff:ffff
191	2001:db8:abcd:be00::/56	2001:db8:abcd:be00:: – 2001:db8:abcd:beff:ffff:ffff:ffff:ffff
192	2001:db8:abcd:bf00::/56	2001:db8:abcd:bf00:: – 2001:db8:abcd:bfff:ffff:ffff:ffff:ffff
193	2001:db8:abcd:c000::/56	2001:db8:abcd:c000:: – 2001:db8:abcd:c0ff:ffff:ffff:ffff:ffff
194	2001:db8:abcd:c100::/56	2001:db8:abcd:c100:: – 2001:db8:abcd:c1ff:ffff:ffff:ffff:ffff
195	2001:db8:abcd:c200::/56	2001:db8:abcd:c200:: – 2001:db8:abcd:c2ff:ffff:ffff:ffff:ffff
196	2001:db8:abcd:c300::/56	2001:db8:abcd:c300:: – 2001:db8:abcd:c3ff:ffff:ffff:ffff:ffff
197	2001:db8:abcd:c400::/56	2001:db8:abcd:c400:: – 2001:db8:abcd:c4ff:ffff:ffff:ffff:ffff
198	2001:db8:abcd:c500::/56	2001:db8:abcd:c500:: – 2001:db8:abcd:c5ff:ffff:ffff:ffff:ffff
199	2001:db8:abcd:c600::/56	2001:db8:abcd:c600:: – 2001:db8:abcd:c6ff:ffff:ffff:ffff:ffff
200	2001:db8:abcd:c700::/56	2001:db8:abcd:c700:: – 2001:db8:abcd:c7ff:ffff:ffff:ffff:ffff
201	2001:db8:abcd:c800::/56	2001:db8:abcd:c800:: – 2001:db8:abcd:c8ff:ffff:ffff:ffff:ffff
202	2001:db8:abcd:c900::/56	2001:db8:abcd:c900:: – 2001:db8:abcd:c9ff:ffff:ffff:ffff:ffff
203	2001:db8:abcd:ca00::/56	2001:db8:abcd:ca00:: – 2001:db8:abcd:caff:ffff:ffff:ffff:ffff
204	2001:db8:abcd:cb00::/56	2001:db8:abcd:cb00:: – 2001:db8:abcd:cbff:ffff:ffff:ffff:ffff
205	2001:db8:abcd:cc00::/56	2001:db8:abcd:cc00:: – 2001:db8:abcd:ccff:ffff:ffff:ffff:ffff
206	2001:db8:abcd:cd00::/56	2001:db8:abcd:cd00:: – 2001:db8:abcd:cdff:ffff:ffff:ffff:ffff
207	2001:db8:abcd:ce00::/56	2001:db8:abcd:ce00:: – 2001:db8:abcd:ceff:ffff:ffff:ffff:ffff
208	2001:db8:abcd:cf00::/56	2001:db8:abcd:cf00:: – 2001:db8:abcd:cfff:ffff:ffff:ffff:ffff
209	2001:db8:abcd:d000::/56	2001:db8:abcd:d000:: – 2001:db8:abcd:d0ff:ffff:ffff:ffff:ffff
210	2001:db8:abcd:d100::/56	2001:db8:abcd:d100:: – 2001:db8:abcd:d1ff:ffff:ffff:ffff:ffff
211	2001:db8:abcd:d200::/56	2001:db8:abcd:d200:: – 2001:db8:abcd:d2ff:ffff:ffff:ffff:ffff
212	2001:db8:abcd:d300::/56	2001:db8:abcd:d300:: – 2001:db8:abcd:d3ff:ffff:ffff:ffff:ffff
213	2001:db8:abcd:d400::/56	2001:db8:abcd:d400:: – 2001:db8:abcd:d4ff:ffff:ffff:ffff:ffff
214	2001:db8:abcd:d500::/56	2001:db8:abcd:d500:: – 2001:db8:abcd:d5ff:ffff:ffff:ffff:ffff
215	2001:db8:abcd:d600::/56	2001:db8:abcd:d600:: – 2001:db8:abcd:d6ff:ffff:ffff:ffff:ffff
216	2001:db8:abcd:d700::/56	2001:db8:abcd:d700:: – 2001:db8:abcd:d7ff:ffff:ffff:ffff:ffff
217	2001:db8:abcd:d800::/56	2001:db8:abcd:d800:: – 2001:db8:abcd:d8ff:ffff:ffff:ffff:ffff
218	2001:db8:abcd:d900::/56	2001:db8:abcd:d900:: – 2001:db8:abcd:d9ff:ffff:ffff:ffff:ffff
219	2001:db8:abcd:da00::/56	2001:db8:abcd:da00:: – 2001:db8:abcd:daff:ffff:ffff:ffff:ffff
220	2001:db8:abcd:db00::/56	2001:db8:abcd:db00:: – 2001:db8:abcd:dbff:ffff:ffff:ffff:ffff
221	2001:db8:abcd:dc00::/56	2001:db8:abcd:dc00:: – 2001:db8:abcd:dcff:ffff:ffff:ffff:ffff
222	2001:db8:abcd:dd00::/56	2001:db8:abcd:dd00:: – 2001:db8:abcd:ddff:ffff:ffff:ffff:ffff
223	2001:db8:abcd:de00::/56	2001:db8:abcd:de00:: – 2001:db8:abcd:deff:ffff:ffff:ffff:ffff
224	2001:db8:abcd:df00::/56	2001:db8:abcd:df00:: – 2001:db8:abcd:dfff:ffff:ffff:ffff:ffff
225	2001:db8:abcd:e000::/56	2001:db8:abcd:e000:: – 2001:db8:abcd:e0ff:ffff:ffff:ffff:ffff
226	2001:db8:abcd:e100::/56	2001:db8:abcd:e100:: – 2001:db8:abcd:e1ff:ffff:ffff:ffff:ffff
227	2001:db8:abcd:e200::/56	2001:db8:abcd:e200:: – 2001:db8:abcd:e2ff:ffff:ffff:ffff:ffff
228	2001:db8:abcd:e300::/56	2001:db8:abcd:e300:: – 2001:db8:abcd:e3ff:ffff:ffff:ffff:ffff
229	2001:db8:abcd:e400::/56	2001:db8:abcd:e400:: – 2001:db8:abcd:e4ff:ffff:ffff:ffff:ffff
230	2001:db8:abcd:e500::/56	2001:db8:abcd:e500:: – 2001:db8:abcd:e5ff:ffff:ffff:ffff:ffff
231	2001:db8:abcd:e600::/56	2001:db8:abcd:e600:: – 2001:db8:abcd:e6ff:ffff:ffff:ffff:ffff
232	2001:db8:abcd:e700::/56	2001:db8:abcd:e700:: – 2001:db8:abcd:e7ff:ffff:ffff:ffff:ffff
233	2001:db8:abcd:e800::/56	2001:db8:abcd:e800:: – 2001:db8:abcd:e8ff:ffff:ffff:ffff:ffff
234	2001:db8:abcd:e900::/56	2001:db8:abcd:e900:: – 2001:db8:abcd:e9ff:ffff:ffff:ffff:ffff
235	2001:db8:abcd:ea00::/56	2001:db8:abcd:ea00:: – 2001:db8:abcd:eaff:ffff:ffff:ffff:ffff
236	2001:db8:abcd:eb00::/56	2001:db8:abcd:eb00:: – 2001:db8:abcd:ebff:ffff:ffff:ffff:ffff
237	2001:db8:abcd:ec00::/56	2001:db8:abcd:ec00:: – 2001:db8:abcd:ecff:ffff:ffff:ffff:ffff
238	2001:db8:abcd:ed00::/56	2001:db8:abcd:ed00:: – 2001:db8:abcd:edff:ffff:ffff:ffff:ffff
239	2001:db8:abcd:ee00::/56	2001:db8:abcd:ee00:: – 2001:db8:abcd:eeff:ffff:ffff:ffff:ffff
240	2001:db8:abcd:ef00::/56	2001:db8:abcd:ef00:: – 2001:db8:abcd:efff:ffff:ffff:ffff:ffff
241	2001:db8:abcd:f000::/56	2001:db8:abcd:f000:: – 2001:db8:abcd:f0ff:ffff:ffff:ffff:ffff
242	2001:db8:abcd:f100::/56	2001:db8:abcd:f100:: – 2001:db8:abcd:f1ff:ffff:ffff:ffff:ffff
243	2001:db8:abcd:f200::/56	2001:db8:abcd:f200:: – 2001:db8:abcd:f2ff:ffff:ffff:ffff:ffff
244	2001:db8:abcd:f300::/56	2001:db8:abcd:f300:: – 2001:db8:abcd:f3ff:ffff:ffff:ffff:ffff
245	2001:db8:abcd:f400::/56	2001:db8:abcd:f400:: – 2001:db8:abcd:f4ff:ffff:ffff:ffff:ffff
246	2001:db8:abcd:f500::/56	2001:db8:abcd:f500:: – 2001:db8:abcd:f5ff:ffff:ffff:ffff:ffff
247	2001:db8:abcd:f600::/56	2001:db8:abcd:f600:: – 2001:db8:abcd:f6ff:ffff:ffff:ffff:ffff
248	2001:db8:abcd:f700::/56	2001:db8:abcd:f700:: – 2001:db8:abcd:f7ff:ffff:ffff:ffff:ffff
249	2001:db8:abcd:f800::/56	2001:db8:abcd:f800:: – 2001:db8:abcd:f8ff:ffff:ffff:ffff:ffff
250	2001:db8:abcd:f900::/56	2001:db8:abcd:f900:: – 2001:db8:abcd:f9ff:ffff:ffff:ffff:ffff
251	2001:db8:abcd:fa00::/56	2001:db8:abcd:fa00:: – 2001:db8:abcd:faff:ffff:ffff:ffff:ffff
252	2001:db8:abcd:fb00::/56	2001:db8:abcd:fb00:: – 2001:db8:abcd:fbff:ffff:ffff:ffff:ffff
253	2001:db8:abcd:fc00::/56	2001:db8:abcd:fc00:: – 2001:db8:abcd:fcff:ffff:ffff:ffff:ffff
254	2001:db8:abcd:fd00::/56	2001:db8:abcd:fd00:: – 2001:db8:abcd:fdff:ffff:ffff:ffff:ffff
255	2001:db8:abcd:fe00::/56	2001:db8:abcd:fe00:: – 2001:db8:abcd:feff:ffff:ffff:ffff:ffff
256	2001:db8:abcd:ff00::/56	2001:db8:abcd:ff00:: – 2001:db8:abcd:ffff:ffff:ffff:ffff:ffff

Prefix sizes you will meet in practice

Prefix	Where it is used
/32	Typical allocation from a regional registry to a provider (LIR).
/48	One site or one organisation. 65,536 /64 networks.
/56	Common assignment to a home or small business customer. 256 /64 networks.
/64	One LAN segment. SLAAC needs exactly /64.
/127	Point-to-point link between routers (RFC 6164).
/128	A single address: loopbacks, host routes.

Short and full notation

An IPv6 address is eight groups of 16 bits. RFC 5952 defines one canonical text form: leading zeros in a group are dropped, the longest run of all-zero groups becomes ::, and letters are lowercase. The calculator always shows the address in that form and gives the full form on its own row.

Common questions

Why is every LAN a /64?

Stateless address autoconfiguration (SLAAC) builds a 64-bit interface identifier, so it stops working with a longer prefix. That made /64 the standard for every LAN, however small.

How do ULAs differ from IPv4 private ranges?

fc00::/7 addresses (fd00::/8 in practice) are not routed on the internet, just like 10.0.0.0/8. Their prefix is generated at random, though, so two merged networks almost never collide.