Registros DNS

Busca y aprende los tipos de registro DNS — ejemplos, cuándo usarlos, referencias RFC

Referencia de tipos de registro DNS. Cada entrada incluye una descripción, ejemplo de sintaxis de zona y notas sobre cuándo usarlo.

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14 tipos de registro

Address (IPv4)RFC 1035

Maps a hostname to a 32-bit IPv4 address.

Ejemplo

example.com.    300    IN  A    93.184.216.34

Cuándo usarlo

Standard hostname → IPv4 mapping. Most websites have at least one A record.

AAAA

Address (IPv6)RFC 3596

Maps a hostname to a 128-bit IPv6 address.

Ejemplo

example.com.    300    IN  AAAA  2606:2800:220:1:248:1893:25c8:1946

Cuándo usarlo

IPv6 endpoint resolution. Modern dual-stack deployments include both A and AAAA.

CNAME

Canonical NameRFC 1035

Alias of one hostname to another. The DNS lookup follows the alias.

Ejemplo

www.example.com.   300   IN  CNAME  example.com.

Cuándo usarlo

Pointing subdomains (www, app) to a primary host. Cannot coexist with other records on the same name.

Mail ExchangeRFC 1035

Specifies mail servers for a domain, with a priority value.

Ejemplo

example.com.    300    IN  MX    10 mail.example.com.

Cuándo usarlo

Required for receiving email. Lower priority = higher preference.

TXT

TextoRFC 1035

Arbitrary text strings. Used for verification and policy declarations.

Ejemplo

example.com.    300    IN  TXT   "v=spf1 include:_spf.google.com ~all"

Cuándo usarlo

SPF/DKIM/DMARC email auth, domain verification (Google/Facebook), public keys.

Name ServerRFC 1035

Delegates a DNS zone to authoritative name servers.

Ejemplo

example.com.    300    IN  NS    ns1.example.com.

Cuándo usarlo

Required at the apex of every zone. Lists which servers answer queries for this domain.

SOA

Start of AuthorityRFC 1035

Authoritative info about the zone: primary NS, admin email, serial, timers.

Ejemplo

example.com.   3600   IN  SOA   ns1.example.com. admin.example.com. 2026050701 7200 3600 1209600 3600

Cuándo usarlo

Exactly one per zone, at the apex. Required by DNS spec.

SRV

Service LocatorRFC 2782

Specifies the host/port for a service — protocol, weight, priority.

Ejemplo

_sip._tcp.example.com. 300 IN SRV 10 60 5060 sipserver.example.com.

Cuándo usarlo

SIP/XMPP/LDAP/Minecraft service discovery. Format: _service._proto.name.

CAA

Certification Authority AuthorizationRFC 8659

Restricts which CAs can issue TLS certificates for the domain.

Ejemplo

example.com.   300    IN  CAA   0 issue "letsencrypt.org"

Cuándo usarlo

Prevent unauthorized CAs from issuing certs for your domain. Recommended for security.

PTR

Pointer (Reverse DNS)RFC 1035

Maps an IP address back to a hostname (in in-addr.arpa or ip6.arpa).

Ejemplo

34.216.184.93.in-addr.arpa.  300  IN  PTR  example.com.

Cuándo usarlo

Reverse DNS for email server reputation (spam filters), logging.

HTTPS

HTTPS Service BindingRFC 9460

Encrypted ALPN/SNI hints for HTTPS connections; supports ECH.

Ejemplo

example.com.   300    IN  HTTPS  1 . alpn="h3,h2"

Cuándo usarlo

Modern HTTPS optimization (HTTP/3 hint, encrypted client hello). Browser support growing.

SVCB

Service BindingRFC 9460

Generic service binding (HTTPS is a specific subtype).

Ejemplo

_dns.example.com. 300 IN SVCB 1 dns.example.com. alpn="dot"

Cuándo usarlo

Generic service alias with hints (e.g., DNS over TLS). Less common than HTTPS.

Delegation SignerRFC 4034

DNSSEC — fingerprint of child zone's KSK, stored in parent zone.

Ejemplo

example.com. 86400 IN DS 12345 13 2 ABC123...

Cuándo usarlo

DNSSEC chain of trust. Required when a zone is DNSSEC-signed.

DNSKEY

DNS Public KeyRFC 4034

DNSSEC — public key for verifying signatures in the zone.

Ejemplo

example.com. 86400 IN DNSKEY 257 3 13 ABC456...

Cuándo usarlo

DNSSEC verification. Stored at zone apex; signed by KSK referenced by parent's DS.

Cómo usar

Escriba un tipo de registro, palabra clave o caso de uso en el campo de búsqueda (p. ej., "MX", "mail", "DNSSEC").
Examine las tarjetas coincidentes, cada una mostrando la insignia de tipo de registro, nombre completo, referencia RFC, descripción, un ejemplo concreto y cuándo usarlo.
Deje el campo vacío para ver los 14 tipos de registro a la vez.

Ejemplos

Buscar "MX" muestra el registro de intercambiador de correo, RFC 1035, con ejemplo "example.com. IN MX 10 mail.example.com." y explica que se usa para enrutar el correo de un dominio.
Buscar "DNSSEC" devuelve tarjetas DS y RRSIG que explican cómo se firman criptográficamente las respuestas DNS.

Verifica las salidas antes de usar en producción. Sin garantía — ver Términos.