// REFERENCE

PTR record (reverse DNS)

Type number: 12

The reverse of A: it points an IP to a name. It lives in the in-addr.arpa zone. It's key for mail reputation: many servers reject MTAs without a consistent PTR.

Related tools

Work with this in:

IP lookup
DNS tool

a
A record aaaa
AAAA record cname
CNAME record txt
TXT record ns
NS record soa
SOA record

Types per the IANA DNS parameters registry and their RFCs. Educational content.