DNS Records

NS record (name server)

Specifies the authoritative DNS servers for your domain/subdomain.

example.com. 86400 IN NS ns1.exampledns.com

example.com: The domain.
86400: The TTL (Time to Live), the time in seconds the record is valid (86400 = 24 hours).
IN: Internet record type. (?)
NS: Indicates it’s a name server record. (?)
ns1.exampledns.com: The DNS server for the domain.

MX record (mail exchange)

Specifies which mail servers should receive email for the domain.

example.com. 3600 IN MX 10 mail1.example.com. example.com. 3600 IN MX 20 mail2.example.com.`

example.com: The domain.
3600: TTL, valid for 1 hour.
MX: Mail Exchange record.
10 and 20: The priority values (lower numbers indicate higher priority, so mail1.example.com is preferred over mail2.example.com).
mail1.example.com: The mail server that accepts emails for the domain.

A record (address)

Maps a domain name to an IPv4 IP address.

www.example.com. 600 IN A 192.0.2.1

CNAME (canonical)

Points a domain name to another domain name (often used for aliases).

blog.example.com. 3600 IN CNAME www.example.com.

blog.example.com: The alias or subdomain.
3600: TTL, valid for 1 hour.
CNAME: Canonical Name record.
www.example.com: The target domain name. When someone visits blog.example.com, it will resolve to the same address as www.example.com.

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