DNS LOOKUP TYPE
DNS Lookup Type | Description | Function |
A | IPv4 address record |
Returns a 32-bit IP address, which typically maps a domain’s hostname to an IP address, but also used for DNSBLs and storing subnet masks
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AAAA | IPv6 address record |
Returns a 128-bit IP address that maps a domain’s hostname to an IP address
|
MX | Mail exchange record |
Maps a domain name to a list of message transfer agents for that domain
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NS | Name server record |
Delegates a DNS zone to use the specified authoritative name servers
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PTR | Pointer record |
Pointer to a canonical name that returns the name only and is used for implementing reverse DNS lookups
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SOA | Start of authority record |
Specifies authoritative information about a DNS zone, including the primary name server, the email of the domain administrator, the domain serial number, and several timers relating to refreshing the zone
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SRV | Service locator |
Generalized service location record, used for newer protocols instead of creating protocol-specific records such as MX
|
TXT | Text record |
Carries extra data, sometimes human-readable, most of the time machine-readable such as opportunistic encryption, DomainKeys, DNS-SD, etc.
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