How to check RDNS Records

Reverse DNS lookup or reverse DNS resolution (rDNS) is the determination of a domain name that is associated with a given IP address using the Domain Name Service (DNS) of the Internet. Many of the website’s is available but as a server administrator why we using those third party tools. Everything is possible in our server. So i’m going to check RDNS in my server.

RDNS Advantages

1) Network troubleshooting assistance
2) Anti-spam
3) Verifying the Forward Confirmed reverse DNS (FCrDNS) format

1) How to check RDNS using host command

You can check the RDNS on your IP using host command in your Linux terminal, Here i’m going to check the RDNS using host command on my server and the results are.

# host 109.123.79.88
88.79.123.109.in-addr.arpa domain name pointer server.2daygeek.com.

2) How to check RDNS using nslookup command

You can check the RDNS on your IP using nslookup command in your Linux terminal, Here i’m going to check the RDNS using nlookup command on my server and the results are.

# nslookup 109.123.79.88
Server:         83.170.64.2
Address:        83.170.64.2#53

88.79.123.109.in-addr.arpa      name = server.2daygeek.com.

3) How to check RDNS using dig command

You can check the RDNS on your IP using dig command in your Linux terminal, Here i’m going to check the RDNS using dig command on my server and the results are.

# dig -x 182.71.233.70 +noall +answer

; <<>> DiG 9.8.2rc1-RedHat-9.8.2-0.23.rc1.el6_5.1 <<>> -x 182.71.233.70 +noall +answer
;; global options: +cmd
70.233.71.182.in-addr.arpa. 86388 IN    PTR     NSG-Static-070.233.71.182.airtel.in.

Note : If you want to add the reverse DNS, you need to contact your IP Provider or Hosting Provider to do it.

Magesh Maruthamuthu

Love to play with all Linux distribution

You may also like...