Reserverade IP-adressintervall
De adressblock som inte är vanliga offentliga adresser, från IANA:s register över specialadresser – och en kontroll som visar vilket block en adress hör till.
100.64.12.7 ligger i 100.64.0.0/10: Delat adressutrymme (CGNAT).
Specialblock i IPv4
| Block | Syfte | Definierat i | Nåbar från internet |
|---|---|---|---|
| 0.0.0.0/8 | OspecificeradThis network | RFC 791 | Nej |
| 10.0.0.0/8 | Privat nätverkPrivate-Use | RFC 1918 | Nej |
| 100.64.0.0/10 | Delat adressutrymme (CGNAT)Shared Address Space (CGNAT) | RFC 6598 | Nej |
| 127.0.0.0/8 | LoopbackLoopback | RFC 1122 | Nej |
| 169.254.0.0/16 | LänklokalLink-Local | RFC 3927 | Nej |
| 172.16.0.0/12 | Privat nätverkPrivate-Use | RFC 1918 | Nej |
| 192.0.0.0/24 | ProtokolltilldelningIETF Protocol Assignments | RFC 6890 | Nej |
| 192.0.2.0/24 | DokumentationDocumentation (TEST-NET-1) | RFC 5737 | Nej |
| 192.31.196.0/24 | AnycastAS112-v4 | RFC 7535 | Ja |
| 192.52.193.0/24 | ProtokolltilldelningAMT | RFC 7450 | Ja |
| 192.88.99.0/24 | ReserveradDeprecated 6to4 Relay Anycast | RFC 7526 | Nej |
| 192.168.0.0/16 | Privat nätverkPrivate-Use | RFC 1918 | Nej |
| 192.175.48.0/24 | AnycastDirect Delegation AS112 Service | RFC 7534 | Ja |
| 198.18.0.0/15 | PrestandatestBenchmarking | RFC 2544 | Nej |
| 198.51.100.0/24 | DokumentationDocumentation (TEST-NET-2) | RFC 5737 | Nej |
| 203.0.113.0/24 | DokumentationDocumentation (TEST-NET-3) | RFC 5737 | Nej |
| 224.0.0.0/4 | MulticastMulticast | RFC 5771 | Nej |
| 240.0.0.0/4 | ReserveradReserved for future use | RFC 1112 | Nej |
| 255.255.255.255/32 | BroadcastLimited Broadcast | RFC 919 | Nej |
Specialblock i IPv6
| Block | Syfte | Definierat i | Nåbar från internet |
|---|---|---|---|
| ::/128 | OspecificeradUnspecified Address | RFC 4291 | Nej |
| ::1/128 | LoopbackLoopback Address | RFC 4291 | Nej |
| ::ffff:0:0/96 | ÖversättningIPv4-mapped Address | RFC 4291 | Nej |
| 64:ff9b::/96 | ÖversättningIPv4-IPv6 Translation (NAT64) | RFC 6052 | Ja |
| 64:ff9b:1::/48 | ÖversättningLocal-use IPv4/IPv6 Translation | RFC 8215 | Nej |
| 100::/64 | ReserveradDiscard-Only Address Block | RFC 6666 | Nej |
| 2001::/32 | ÖversättningTEREDO | RFC 4380 | Nej |
| 2001:2::/48 | PrestandatestBenchmarking | RFC 5180 | Nej |
| 2001:db8::/32 | DokumentationDocumentation | RFC 3849 | Nej |
| 2001:10::/28 | ReserveradDeprecated (ORCHID) | RFC 4843 | Nej |
| 2001:20::/28 | ProtokolltilldelningORCHIDv2 | RFC 7343 | Ja |
| 2002::/16 | Översättning6to4 | RFC 3056 | Nej |
| 3fff::/20 | DokumentationDocumentation | RFC 9637 | Nej |
| 5f00::/16 | ProtokolltilldelningSegment Routing (SRv6) SIDs | RFC 9602 | Nej |
| fc00::/7 | Unik lokal adress (ULA)Unique-Local | RFC 4193 | Nej |
| fe80::/10 | LänklokalLink-Local Unicast | RFC 4291 | Nej |
| ff00::/8 | MulticastMulticast | RFC 4291 | Nej |
Hämtat ur IANA:s register över specialadresser för IPv4 och IPv6, plus multicast och den gamla klass E. ”Nåbar från internet” följer IANA:s kolumn ”globally reachable”. En privat adress routas aldrig på det offentliga internet.
Den här texten finns inte på svenska ännu. Den visas på engelska tills en översättning har publicerats.
Not every IP address is meant to be routed on the internet. IANA keeps two special-purpose address registries, one for IPv4 and one for IPv6, listing the blocks set aside for private networks, loopback, link-local use, documentation, benchmarking, protocol translation and other purposes. Together with the multicast ranges and IPv4’s old class E, they are the addresses a router should never accept as ordinary public destinations, often called bogons.
The ones you are most likely to meet: the three private ranges of RFC 1918 (10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16) used in almost every home and office network; shared address space 100.64.0.0/10 used by providers for carrier-grade NAT; link-local 169.254.0.0/16 and fe80::/10, which a device gives itself when nothing else configures it; and the documentation blocks (192.0.2.0/24, 198.51.100.0/24, 203.0.113.0/24, 2001:db8::/32) reserved for examples like the ones on this site.
The table is generated from the same registry data this site uses to classify every lookup, and the checker tells you which block an address belongs to, right in your browser.
Vanliga frågor
My router's WAN address starts with 100.64. Is that a problem?
It means your provider uses carrier-grade NAT: you share a public IPv4 address with other customers. Browsing works normally, but you cannot open ports to the internet over IPv4. IPv6 or a fixed public address solves it.
Why did my PC get a 169.254.x.x address?
It asked for an address (DHCP) and got no answer, so it assigned itself a link-local address. Check the cable or Wi-Fi connection and the router's DHCP server.
Can I use 192.0.2.0/24 or 2001:db8::/32 in my network?
You should not. They are reserved for documentation, so examples never collide with real networks. Use the private ranges, or unique local addresses (fd00::/8) for IPv6.