How to check PTR (pointer) records with nslookup

Use nslookup to check the PTR (pointer) records of a domain.

A PTR record provides the domain name associated with an IP address. A PTR record is the reversed A record (A record provides the IP associated with a domain name).

View the PTR records of a domain using nslookup and -debug option:

$ nslookup -debug IP_ADDRESS

The PTR records are displayed under the "ANSWERS" and "Non-authoritative answer" sections:

Server:      192.168.0.1
Address:    192.168.0.1#53

------------
    QUESTIONS:
    46.39.251.142.in-addr.arpa, type = PTR, class = IN
    ANSWERS:
    ->  46.39.251.142.in-addr.arpa
    name = bud02s38-in-f14.1e100.net.
    ttl = 28040
    AUTHORITY RECORDS:
    ADDITIONAL RECORDS:
------------
Non-authoritative answer:
46.39.251.142.in-addr.arpa  name = bud02s38-in-f14.1e100.net.

Authoritative answers can be found from: