How to verify RDNS works

Introduction

Once you have configured Reverse DNS (RDNS), you may need to verify it works. To do this, you may follow the steps listed below.

Procedure

Windows systems:

1. Press the "Windows" key or open the start menu manually.

2. Search for "cmd" and open the Command Prompt.

3. Run the following command ( replace 192.168.0.1 with the IP address you need to verify RDNS on ):

nslookup 192.168.0.1

If you correctly configured reverse DNS, the output will be similar to the following example:

Name: host.example.tld
Address: 192.168.0.1

Unix-based systems:

1. Open a terminal.

2. Run the host or dig command (replace 192.168.0.1 with the IP address you need to verify RDNS on).

host:

host 192.168.0.1

If you correctly configured reverse DNS, the output will be similar to the following example:

1.0.168.192.in-addr.arpa domain name pointer host.example.tld.

dig:

dig +noall +answer -x 192.168.0.1

If you correctly configured reverse DNS, the output will be similar to the following example:

1.0.168.192.in-addr.arpa. 85524 IN PTR host.example.tld