How to verify rDNS (reverse DNS)/PTR Record

RDNS (Reverse DNS) resolves an IP address to a domain name. To find rDNS for an IP address, you can use the command nslookup.

nslookup IP_ADDR_HERE

In the above screenshot, IP address 51.38.246.115 have reverse DNS set to ok.serverok.in

You also need to verify the hostname points to IP address. Many server providers check this before settings reverse dns entry.

root@server12:~# nslookup ok.serverok.in
Server:		213.133.99.99
Address:	213.133.99.99#53

Non-authoritative answer:
Name:	ok.serverok.in
Address: 51.38.246.115

root@server12:~# 

Find rDNS using dig command

To find rDNS of an IP address, use the command

dig +short -x IP_ADDR_HERE

Example

root@server12:~# dig +short -x 51.38.246.115
ok.serverok.in.
root@server12:~# 
root@server12:~# dig +noall +answer -x 51.38.246.115
115.246.38.51.in-addr.arpa. 86400 IN	PTR	ok.serverok.in.
root@server12:~# 

Find rDNS using host command

host IP_ADDR_HERE

Example

root@server12:~# host 51.38.246.115
115.246.38.51.in-addr.arpa domain name pointer ok.serverok.in.
root@server12:~# 

Back to Reverse DNS