Which of the following DNS records allows for reverse lookup of a domain?
A.
PTR
B.
AAAA
C.
A
D.
MX
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A- Address record: Returns a 32-bit IPv4 address, most commonly used to map hostnames to an IP address of the host, but also used for DNSBLs, storing subnet masks in RFC 1101, etc.
MX- Mail exchange record: Maps a domain name to a list of message transfer agents for that domain
AAAA- IPv6 address record: Returns a 128-bit IPv6 address, most commonly used to map hostnames to an IP address of the host.
PTR- Pointer record: Pointer to a canonical name. Unlike a CNAME, DNS processing does NOT proceed, just the name is returned. The most common use is for implementing reverse DNS lookups, but other uses include such things as DNS-SD.
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