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
 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
 NS Name server record
 Delegates a DNS zone to use the specified authoritative name servers
 PTR Pointer record
 Pointer to a canonical name that returns the name only and is used for implementing reverse DNS lookups
 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
 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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