About prefixkit

prefixkit is a set of free tools for people who work with networks and telephony: administrators, telecom engineers, developers, and anyone who needs to quickly understand what is going on with an address, a number or a call.

What is here

• What is my IP, IP lookup and autonomous systems with ready-made firewall prefix lists.
• Is it down? checks from Russia, the UAE and other countries, ping, traceroute and a speed test.
• DNS lookup with SPF, DKIM and DMARC checks, DNS propagation, a blacklist check and WHOIS.
• VoIP pcap analyzer and references for SIP codes and Q.850 causes.
• Calling codes for countries, cities and operators, and phone number lookup.
• Subnet calculators for IPv4 and IPv6 and the CIDR table.

Where the data comes from

Numbering plans come from Google libphonenumber, IP data from DB-IP and IPinfo, registration data from registries over RDAP, the map from Natural Earth, flags from flag-icons, and multi-country checks from the open Globalping network. All are open or licensed sources, credited on the tool pages.

Contact

Found a mistake or want to suggest a tool? Write to hello@prefixkit.com.