Reverse mapping: Difference between revisions
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imported>Howard C. Berkowitz (start of article; too much for basic DNS; getting the courage to face CIDR mapping) |
John Leach (talk | contribs) m (Text replacement - "address registry" to "address registry") |
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In the [[Domain Name Service]] (DNS), '''reverse mapping''' is the function that, when given an [[Internet Protocol version 4]] or an [[Internet Protocol version 6]] address, returns an associated '''domain name'''. | In the [[Domain Name Service]] (DNS), '''reverse mapping''' is the function that, when given an [[Internet Protocol version 4]] or an [[Internet Protocol version 6]] address, returns an associated '''domain name'''. | ||
When a block of address space is assigned by an | When a block of address space is assigned by an address registry or upstream provider, there is usually a mapping for the entire block, which links to a database at an address registry. This database will provide administrative information about the recipient of the allocation, such as receiving organization, and its technical and administrative contacts. | ||
In configuring DNS, where type A (IPv4) or AAAA (IPv6) '''resource records (RR)''' do name-to-address '''forward mapping''', type PTR RRs describe the reverse mapping. | In configuring DNS, where type A (IPv4) or AAAA (IPv6) '''resource records (RR)''' do name-to-address '''forward mapping''', type PTR RRs describe the reverse mapping. | ||
Revision as of 06:27, 17 March 2024
In the Domain Name Service (DNS), reverse mapping is the function that, when given an Internet Protocol version 4 or an Internet Protocol version 6 address, returns an associated domain name.
When a block of address space is assigned by an address registry or upstream provider, there is usually a mapping for the entire block, which links to a database at an address registry. This database will provide administrative information about the recipient of the allocation, such as receiving organization, and its technical and administrative contacts.
In configuring DNS, where type A (IPv4) or AAAA (IPv6) resource records (RR) do name-to-address forward mapping, type PTR RRs describe the reverse mapping.