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 192.168.0.1
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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