DNS Record

A DNS file is a plain textual content entry in a zone file that comprises essential details about a domain, and is a vital a part of the Domain Name System. A site’s zone file comprises a number of DNS information that assist translate human-readable domains into machine-readable IP addresses, together with a site’s title server and mail server info. A DNS file can even embody domain aliases for forwarding domains and subdomains.

Each DNS file in a zone file comprises a single piece of knowledge, which work collectively to offer a full set of directions for accessing that domain and its sources. There are a number of varieties of DNS file that every present completely different info. Some of the commonest varieties of DNS file are listed beneath.

  • NS information record the domain’s title servers.
  • A information record the domain’s IPv4 deal with.
  • AAAA information record the domain’s IPv6 deal with.
  • SOA (Start of Authority) information embody authoritative info for a site, together with its main title server and timers that instruct how typically to refresh its DNS info.
  • MX information record mail servers that deal with electronic mail despatched to the domain.
  • CNAME information create aliases (or canonical names) that ahead requests to a different domain or subdomain.

DNS information in a zone file sometimes observe the identical sample, beginning with the domain or hostname, adopted by a file kind, after which itemizing particulars for that file kind. Several examples are listed beneath.

instance.com   IN   NS   ns1.instance.com

instance.com   IN   A

instance.com   IN   AAAA   2001:db8:85a3::8a2e:370:7334

instance.com   IN   MX   mail.instance.com

app.instance.com   IN   CNAME   net.instance.com

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