reverse DNS

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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 e-mail 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.
Supporting both forward and reverse mapping, it offers transparent persistence for your DAL and business objects.
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.
Pocket Express' mobile mapping service is integrated with 411, offers turn-by-turn driving directions, and reverse mapping.
Full Lifecycle Support: The Reverse Mapping Tool automatically generates all the files needed to interact with the database using Kodo JDO from an existing database schema.
Reverse Mapping: A Reverse Mapping Wizard detects existing legacy data models and creates respective object models, which can be easily edited.
Two involve Web Services: One defines a mapping from Web Services Definition Language (WSDL) and SOAP to CORBA(R), complementing the reverse mapping from CORBA to WSDL/SOAP; the other standardizes a Web Services representation for Enterprise Collaboration.
Enhancements to WARP's Reverse Mapping and Policy Routing technologies have resulted in improved methods for better control of bi-directional IP traffic.
InfiniBridge devices include a hardware Transport Protocol Engine (TPE) that automatically maps PCI to InfiniBand semantics and performs reverse mapping.