Reverse DNS Lookup

About Reverse DNS Lookup

Reverse DNS Lookup finds the PTR record of an IP address - the hostname officially associated with that IP by the owner of the network block. A correct PTR that matches the A record (forward-confirmed reverse DNS) is important for mail servers: many providers reject or flag as spam any email sent from an IP without a valid PTR. This tool also helps identify the machine behind an IP when reading logs.

How to use

1. 1 Enter the target you want to check (a domain, IP address, or URL) in the field provided.
2. 2 Click the run button - the request is processed on Computing ID servers and the results are shown in the panel.
3. 3 Read the results; copy the parts you need, or change the input and run it again to compare.

Free tools from Computing ID

Reverse DNS Lookup is one of dozens of network, security, and developer utilities provided free of charge by Computing ID (PT Intprism Computing Technology). Every tool can be used without creating an account or logging in. For tools that run entirely in the browser, your data is never sent to our servers; for tools that need to call a server (such as a DNS lookup or SSL check), only the target you enter is processed, and it is not stored. If you need infrastructure to run your own services, Computing ID also offers Linux and Windows VPS, cPanel hosting, email hosting, S3 Object Storage, WireGuard VPN, and domain registration, with data centers in Indonesia and Singapore and 24/7 technical support.