Registro Glue
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Definición
Un registro A o AAAA proporcionado por una zona DNS padre que resuelve la dirección IP del servidor de nombres de una zona hija, rompiendo una dependencia circular cuando el nombre de host del servidor de nombres está dentro de la zona que sirve.
The Circular Reference Problem
A glue record solves a fundamental bootstrapping problem in DNSDomain Name System. The hierarchical, distributed naming system that translates human-readable domain names (e.g., example.com) into IP addresses (e.g., 93.184.216.34). Often called the "phonebook of the internet.": if your domain (example.com) is delegated to name servers that themselves are within your domain (ns1.example.com), a resolver faces a circular dependency — it needs to resolve example.com to find ns1.example.com, but it needs ns1.example.com to resolve example.com. Glue records break this loop.
How Glue Records Work
The parent zone (e.g., .com) stores glue records — AA DNS record that maps a domain name to an IPv4 address (e.g., example.com -> 93.184.216.34). The most fundamental DNS record type for resolving domain names to IP addresses. or AAAAA DNS record that maps a domain name to an IPv6 address. Named "AAAA" (quad-A) because an IPv6 address is four times the size of an IPv4 address. records for your name servers — alongside the NSName Server record. A DNS record that delegates a domain or subdomain to a set of authoritative DNS servers. Every domain must have at least two NS records for redundancy. delegation records. When a resolver queries the .com TLDTop-Level Domain. The rightmost label in a domain name (e.g., .com, .org, .net). TLDs are managed by ICANN and include generic TLDs (gTLDs), country-code TLDs (ccTLDs like .kr, .uk), and sponsored TLDs (.edu, .gov). servers for example.com, the response includes both the NS records (ns1.example.com, ns2.example.com) and the glue A records (the IP addresses of those name servers). The resolver can then contact the authoritative servers directly without needing to resolve their hostnames first.
When Glue Is Required vs. Optional
Glue is required only when the name server hostname is within the delegated zone itself. If you delegate example.com to ns1.somedns-provider.com (a name server in a different domain), no glue is needed — the resolver can look up somedns-provider.com independently. Missing or stale glue records cause delegation failures and intermittent resolution errors, making them a frequent cause of "domain not resolving" incidents after registrar migrations. DNS Lookup