reverse DNS

(redirected from reverse mapping)

reverse DNS

(Reverse Domain Name System) Name resolution that is the opposite of the standard forward 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" and "reverse mapping," 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 email message is coming from the domain name indicated in the message header. Reverse DNS is an option and not mandatory in a DNS server. See DNS records, DNS and SPF.
References in periodicals archive ?
The text includes a new chapter on the relational model and functional dependencies, expanded chapters on Enhanced Entity Relationship diagrams and reverse mapping, updated exercises, case studies, and a glossary.
The skill is to be able to interpret this jumble of surface rock and, by a process of reverse mapping, come up with a three-dimensional plan of what might be underneath.
It also has information of SPF, the Sender Policy Framework, incremental zone transfer, forward zones, Ipv6 forward and reverse mapping, transaction signatures, ENUM, architecture for an organization, IDN, and revised DNS Security Extensions, and more on NOTIFY, securing nameservers, and dealing with internet firewalls.
Kodo JDO has been available since 1999 and provides forward mapping, reverse mapping and 'meet in the middle' mapping as well as a level 2 database cache, statement balancing, query caching, prepared statement caching and custom fetch groups.
The content server passes the result through the passage back to the proxy, called reverse mapping.