reverse DNS

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reverse DNS

(Reverse Domain Name System) Name resolution that is the opposite of the standard DNS query. Most of the time, the DNS is queried with a domain name to return the host's IP address. With reverse DNS, also called "inverse DNS," the DNS system is sent an IP address, and the domain name is returned.

Reverse DNS is used to log incoming traffic by domain name for statistical purposes. It is also used to prevent spam by determining if the e-mail message is coming from the domain name indicated in the message header. Reverse DNS is only an option and not mandatory in a DNS server. See DNS records, DNS and SPF.

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DNS	DNS records

DynDNS can also reject e-mail which comes from a server without proper reverse DNS.

DynDNS' MailHop Sees Major Anti-Spam Improvements by Business Wire

Reverse DNS Lookup: allows administrators to look up a hostname using the IP address to find information about an IP address that is causing problems, to verify that a mail server has a reverse DNS entry, or to gather information about who is visiting your website.

Leading Web Application for DNS Monitoring Will Introduce Targeted ... by Business Wire

Even a reverse DNS lookup report gives only one host name and misses the correct answer most of the time.

Intrusion Announces Internet Investigation Tool to Track Down Bad ... by Business Wire

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