DNS Record

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

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

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

DNS data in a zone file sometimes comply with the identical sample, beginning with the domain or hostname, adopted by a file sort, after which itemizing particulars for that file sort. Several examples are listed under.

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   internet.instance.com

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