Reverse DNS and IP Lookup

A reverse IP lookup can help you identify other domain names that may be owned by the same entity. A reverse IP lookup can also help you identify spammers who may be using more than one IP that is within the same block or provided by the same ISP or other provider. Reverse IP lookup can also sometimes be used to identify the actual domain name that spammers might be using. Violators of a trademark can also be identified with a reverse IP lookup, as can someone trying to hack your network, server or website.

When you perform a reverse IP lookup you can also gather competitive information and possibly identify who is using an IP and its related domain name, or at a minimum, the name of the Internet Service Provider (ISP) or vendor who owns a particular IP address. In the case of an Internet connection, a reverse IP lookup will display the server, server address and non-authoritative answer for the IP address you search by. If a domain name is being used the reverse IP will still display the same information.

You can use a combination of different tools here on the WhoIs website to find out more information. For example, you can use the reverse IP lookup tool on this page to find the IP address for a domain name. Use our Whois lookup to review details about the entity that owns a specific domain. This tool identifies the referral URL, the name of the registrar, name server information and the expiration date of the domain and many more.