Enter an IP Address
Enter any IPv4 or IPv6 address to identify which special or reserved range it belongs to
Supports IPv4 (e.g. 10.0.0.1) and IPv6 (e.g. ::1, 2001:db8::1, fe80::1)
Quick Reference
Complete list of special-purpose IPv4 and IPv6 address ranges
About This Tool
What It Does
- Classifies any IPv4 or IPv6 address into its special-purpose range
- Identifies private (RFC 1918), CGNAT (RFC 6598), link-local, multicast, and more
- Shows routability — whether the address can appear on the public internet
- References RFCs — links to the authoritative standards for each range
Common Use Cases
- Checking if an IP in logs is private, CGNAT, or public
- Verifying whether an address should be filtered at a firewall
- Identifying 6to4, Teredo, or NAT64 tunnel addresses
- Quick reference for documentation and benchmarking ranges