OSN

Reference

Bogons and special-purpose addresses

The IPv4 and IPv6 ranges reserved for special purposes, which no public host uses.

Address ranges that are never hosts on the public internet: private networks, loopback, link-local, documentation, multicast and reserved space. Traffic from them on the internet is spoofed or misconfigured. This site never calls them blocklisted, and space no registry has allocated is treated the same way.

IPv4

RangePurposeDefined in
0.0.0.0/8"This network"RFC 791
10.0.0.0/8Private useRFC 1918
100.64.0.0/10Shared address space (carrier-grade NAT)RFC 6598
127.0.0.0/8LoopbackRFC 1122
169.254.0.0/16Link localRFC 3927
172.16.0.0/12Private useRFC 1918
192.0.0.0/24IETF protocol assignmentsRFC 6890
192.0.2.0/24Documentation (TEST-NET-1)RFC 5737
192.88.99.0/24Deprecated 6to4 relay anycastRFC 7526
192.168.0.0/16Private useRFC 1918
198.18.0.0/15BenchmarkingRFC 2544
198.51.100.0/24Documentation (TEST-NET-2)RFC 5737
203.0.113.0/24Documentation (TEST-NET-3)RFC 5737
224.0.0.0/4MulticastRFC 5771
240.0.0.0/4Reserved for future use (and the limited broadcast address 255.255.255.255)RFC 1112, RFC 919

IPv6

Only 2000::/3 is global unicast space today; everything outside it is not a public host address either.

RangePurposeDefined in
::/128Unspecified addressRFC 4291
::1/128LoopbackRFC 4291
::ffff:0:0/96IPv4-mapped addressesRFC 4291
64:ff9b::/96IPv4/IPv6 translationRFC 6052
100::/64Discard onlyRFC 6666
2001:db8::/32DocumentationRFC 3849
3fff::/20DocumentationRFC 9637
2002::/166to4RFC 3056
fc00::/7Unique local addressesRFC 4193
fe80::/10Link-local unicastRFC 4291
ff00::/8MulticastRFC 4291

Blocklisted networks · Address directory