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rDNS Last modified: Wednesday, September 15, 2004
(pronounced as separate letters) Short for reverse DNS, a method of name resolution in which an IP address is resolved into a domain name, which is the opposite of the typical resolution method of DNS, which resolves domain names into IP addresses. One practical application of reverse DNS is as an anti-spam measure. Because spammers often use invalid IP addresses to send e-mails, rDNS will determine the authenticity of a domain name compared to the IP address from which it is originating.
	Related Categories Addressing Domain Name System Related Terms DNS DNS parking domain domain name dynamic DNS IP address spam