Classify an IP address as private, loopback, link-local, multicast, or public. Browse all RFC-defined special-purpose ranges for IPv4 and IPv6 .
Classify an IP Address (optional)
IPv4 Special-Purpose Ranges
| Range (CIDR) | Description | RFC | Type |
|---|---|---|---|
| 10.0.0.0/8 | Private network (Class A) | RFC 1918 | private |
| 172.16.0.0/12 | Private network (Class B) | RFC 1918 | private |
| 192.168.0.0/16 | Private network (Class C) | RFC 1918 | private |
| 127.0.0.0/8 | Loopback addresses | RFC 5735 | loopback |
| 169.254.0.0/16 | Link-local / APIPA (Auto-IP) | RFC 3927 | link-local |
| 224.0.0.0/4 | Multicast addresses | RFC 5771 | multicast |
| 240.0.0.0/4 | Reserved for future use | RFC 1112 | reserved |
| 192.0.2.0/24 | Documentation (TEST-NET-1) | RFC 5737 | documentation |
| 198.51.100.0/24 | Documentation (TEST-NET-2) | RFC 5737 | documentation |
| 203.0.113.0/24 | Documentation (TEST-NET-3) | RFC 5737 | documentation |
| 0.0.0.0/8 | This network (unspecified) | RFC 1122 | reserved |
| 100.64.0.0/10 | Shared address space (CGN) | RFC 6598 | private |
| 192.88.99.0/24 | 6to4 relay anycast (deprecated) | RFC 7526 | reserved |
| 198.18.0.0/15 | Benchmarking (BMWG) | RFC 2544 | reserved |
| 255.255.255.255/32 | Limited broadcast | RFC 919 | reserved |
IPv6 Special-Purpose Ranges
| Range | Description | RFC | Type |
|---|---|---|---|
| ::1/128 | Loopback address | RFC 4291 | loopback |
| ::/128 | Unspecified address | RFC 4291 | reserved |
| fc00::/7 | Unique local addresses (ULA) | RFC 4193 | private |
| fe80::/10 | Link-local addresses | RFC 4291 | link-local |
| ff00::/8 | Multicast addresses | RFC 4291 | multicast |
| 2001:db8::/32 | Documentation | RFC 3849 | documentation |
| 2002::/16 | 6to4 (deprecated) | RFC 7526 | reserved |
| 64:ff9b::/96 | IPv4/IPv6 translation (NAT64) | RFC 6052 | reserved |
| 100::/64 | Discard-only address block | RFC 6666 | reserved |
| 2001::/32 | Teredo tunneling | RFC 4380 | reserved |
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