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Rangos de direcciones IP reservados

Los bloques de direcciones que no son direcciones públicas normales, según los registros de IANA, y una comprobación que indica a qué bloque pertenece una dirección.

100.64.12.7 está en 100.64.0.0/10: Espacio de direcciones compartido (CGNAT).

Bloques IPv4 de uso especial

BloqueUsoDefinido enAccesible desde internet
0.0.0.0/8No especificadaThis networkRFC 791No
10.0.0.0/8Red privadaPrivate-UseRFC 1918No
100.64.0.0/10Espacio de direcciones compartido (CGNAT)Shared Address Space (CGNAT)RFC 6598No
127.0.0.0/8Bucle localLoopbackRFC 1122No
169.254.0.0/16Enlace localLink-LocalRFC 3927No
172.16.0.0/12Red privadaPrivate-UseRFC 1918No
192.0.0.0/24Asignación de protocoloIETF Protocol AssignmentsRFC 6890No
192.0.2.0/24DocumentaciónDocumentation (TEST-NET-1)RFC 5737No
192.31.196.0/24AnycastAS112-v4RFC 7535Sí
192.52.193.0/24Asignación de protocoloAMTRFC 7450Sí
192.88.99.0/24ReservadaDeprecated 6to4 Relay AnycastRFC 7526No
192.168.0.0/16Red privadaPrivate-UseRFC 1918No
192.175.48.0/24AnycastDirect Delegation AS112 ServiceRFC 7534Sí
198.18.0.0/15Pruebas de rendimientoBenchmarkingRFC 2544No
198.51.100.0/24DocumentaciónDocumentation (TEST-NET-2)RFC 5737No
203.0.113.0/24DocumentaciónDocumentation (TEST-NET-3)RFC 5737No
224.0.0.0/4MultidifusiónMulticastRFC 5771No
240.0.0.0/4ReservadaReserved for future useRFC 1112No
255.255.255.255/32DifusiónLimited BroadcastRFC 919No

Bloques IPv6 de uso especial

BloqueUsoDefinido enAccesible desde internet
::/128No especificadaUnspecified AddressRFC 4291No
::1/128Bucle localLoopback AddressRFC 4291No
::ffff:0:0/96TraducciónIPv4-mapped AddressRFC 4291No
64:ff9b::/96TraducciónIPv4-IPv6 Translation (NAT64)RFC 6052Sí
64:ff9b:1::/48TraducciónLocal-use IPv4/IPv6 TranslationRFC 8215No
100::/64ReservadaDiscard-Only Address BlockRFC 6666No
2001::/32TraducciónTEREDORFC 4380No
2001:2::/48Pruebas de rendimientoBenchmarkingRFC 5180No
2001:db8::/32DocumentaciónDocumentationRFC 3849No
2001:10::/28ReservadaDeprecated (ORCHID)RFC 4843No
2001:20::/28Asignación de protocoloORCHIDv2RFC 7343Sí
2002::/16Traducción6to4RFC 3056No
3fff::/20DocumentaciónDocumentationRFC 9637No
5f00::/16Asignación de protocoloSegment Routing (SRv6) SIDsRFC 9602No
fc00::/7Local única (ULA)Unique-LocalRFC 4193No
fe80::/10Enlace localLink-Local UnicastRFC 4291No
ff00::/8MultidifusiónMulticastRFC 4291No

Según los registros de IANA de direcciones IPv4 e IPv6 de uso especial, más multicast y la antigua clase E. «Accesible desde internet» sigue la columna «globally reachable» de IANA. Una dirección privada nunca se enruta en la internet pública.

Este texto aún no está disponible en español. Se muestra en inglés hasta que se publique una traducción.

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.

Preguntas frecuentes

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.

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