Most Linux, Windows and macOS systems have already an integrated tool with nslookup that allows any requests to be sent to the Domain Name System. You can therefore use this program to execute both standard DNS requests as well as reverse DNS lookups, whereby the local DNS server defined by the provider is contacted by default. But another name server can be defined, if necessary.
Alternatively, you can perform rDNS address requests via the web. There are many online tools available based on nslookup, which allow you to submit DNS server requests directly in the browser. Here are three such solutions:
- MxToolBox: MxToolBox is an online service that provides a range of network diagnostics and lookup tools. While some of these functions are subject to a charge, the reverse DNS check using the SuperTool is always free. To use it, simply select the option “Reverse Lookup” and enter either an IPv4 or IPv6 address.
- WhatIsMyIP.com: Not only can you check your IP address on WhatIsMyIP.com – as the name suggests – you can also execute rDNS requests. Select the “Reverse DNS Lookup” option, type the IPv4 or IPv6 address into the entry field, and press “Lookup”.
- Debouncer: The Debouncer web service is aimed specifically at anyone who wants to check whether their own domain or mail server is on a spam blacklist. For this purpose, the “Reverse DNS check” also allows reverse DNS requests. However, it is only possible to check IPv4 addresses.
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