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Private & Special-Use IP Ranges

IANA Special-Purpose IPv4 and IPv6 blocks, plus well-known multicast. Two-sided print — IPv4 on page 1, IPv6 on page 2.

IPv4 special-purpose blocks

BlockNameUsageRFC
0.0.0.0/8“This network”Source only, never routedRFC 1122
10.0.0.0/8PrivateRFC 1918 enterprise / homeRFC 1918
100.64.0.0/10Shared / CGNATISP carrier-grade NAT poolRFC 6598
127.0.0.0/8LoopbackLocalhost (only 127.0.0.1 typ.)RFC 1122
169.254.0.0/16Link-local / APIPAAuto-config when no DHCPRFC 3927
172.16.0.0/12PrivateRFC 1918RFC 1918
192.0.0.0/24IETF protocol assign.IANA-reserved protocol useRFC 6890
192.0.2.0/24TEST-NET-1Documentation onlyRFC 5737
192.88.99.0/246to4 anycastDeprecated relayRFC 7526
192.168.0.0/16PrivateRFC 1918 — most common for homeRFC 1918
198.18.0.0/15BenchmarkingPerformance testingRFC 2544
198.51.100.0/24TEST-NET-2DocumentationRFC 5737
203.0.113.0/24TEST-NET-3DocumentationRFC 5737
224.0.0.0/4MulticastOne-to-many deliveryRFC 5771
240.0.0.0/4Reserved (future)Experimental / unallocatedRFC 1112
255.255.255.255/32Limited broadcastLocal link onlyRFC 8190

Well-known IPv4 multicast

224.0.0.1All Systems on subnet
224.0.0.2All Routers on subnet
224.0.0.5OSPF All Routers
224.0.0.6OSPF Designated Routers
224.0.0.9RIP-2
224.0.0.10EIGRP
224.0.0.13PIM
224.0.0.18VRRP
224.0.0.22IGMPv3
224.0.0.251mDNS (Bonjour)
224.0.0.252LLMNR
239.0.0.0/8Admin-scoped (org-local)

IPv6 special-purpose prefixes

PrefixNameUsageRFC
::/128UnspecifiedSource when no address configuredRFC 4291
::1/128LoopbackIPv6 localhostRFC 4291
::ffff:0:0/96IPv4-mappedDual-stack socketsRFC 4291
64:ff9b::/96NAT64 well-knownStateful NAT64 translationRFC 6052
64:ff9b:1::/48NAT64 localSite-local NAT64RFC 8215
100::/64Discard-onlyBlack-hole / sink prefixRFC 6666
2001::/32TeredoIPv4 tunneling (legacy)RFC 4380
2001:db8::/32DocumentationExamples only — never routedRFC 3849
2002::/166to4Deprecated transitionRFC 7526
fc00::/7Unique Local (ULA)Enterprise-internal, unroutedRFC 4193
fe80::/10Link-localAuto-assigned per interfaceRFC 4291
ff00::/8MulticastOne-to-many deliveryRFC 4291

Well-known IPv6 multicast

ff02::1All nodes on link
ff02::2All routers on link
ff02::5OSPFv3 All Routers
ff02::6OSPFv3 Designated Routers
ff02::9RIPng routers
ff02::aEIGRP routers
ff02::dPIM routers
ff02::12VRRP
ff02::16MLDv2 reports
ff02::1:2All DHCP agents on link
ff02::fbmDNS (IPv6)
ff02::1:ff00:0/104Solicited-node range

IPv6 multicast scope prefixes

PrefixScope
ff01Interface-local
ff02Link-local
ff04Admin-local
ff05Site-local
ff08Organization-local
ff0eGlobal
Private & Special-Use IP Ranges everydayapps.io v1