Our reverse DNS tool allows you to do a reverse DNS lookup on any IP address and see the reverse DNS (rDNS) value, i.e. you can see what domain sits at that IP address (this is why it is sometimes referred to as a “reverse IP lookup tool”). Reasons that you may want to do a reverse DNS lookup are many, however in the context of email you want to be sure that the IP address through which you send email is associated with your sending domain.

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