DNS records in Linux

常用的各种dns记录

Understanding PTR MX SRV SPF AAAA DNS Records

• NS record - The Name Server record simply specifies the other name
  servers for the domain, or maps a domain name to that of the primary
  server for the zone.
• A record The Address record holds the IP address of the name.
• CNAME record The Canonical Name record is an alias field allowing you
  to specify more than one name for each TCP/IP address.
• MX record The Mail Exchange record specifies the name of the host
  that processes mail for this domain.
• HINFO record The Host record is the record that actually specifies
  the TCP/IP address for a specified host. All hosts that have static
  TCP/IP addresses should have an entry in this database.
• PTR record Pointer records are used for reverse lookup entries. They
  specify the IP address in reverse order and the corresponding host
  name.

用dig查询DNS记录

Using Linux Dig to Query DNS Records

• Simple lookup : dig hackersgarage.com
• Lookup Name Servers: dig @8.8.8.8 hackersgarage.com NS
• Lookup using external DNS Server: dig @8.8.8.8 hackersgarage.com
• Lookup MX record: dig @8.8.8.8 hackersgarage.com MX
• Lookup CNAME record: dig @8.8.8.8 hackersgarage.com CNAME
• Look TXT record (e.g will it will return SPF records, google verification methods): dig @8.8.8.8 hackersgarage.com TXT