3/30/2023 0 Comments Recordit and otherWhen an A record lookup for is carried out, the resolver will see a CNAME record and restart the checking at and will then return 192.0.2.23. (If the resolver is specifically told to look for CNAME records, the canonical name (right-hand side) is returned, rather than restarting the query.) The canonical name that a CNAME record points to can be anywhere in the DNS, whether local or on a remote server in a different DNS zone.įor example, if there is a DNS zone as follows: When a DNS resolver encounters a CNAME record while looking for a regular resource record, it will restart the query using the canonical name instead of the original name. Then, if the IP address ever changes, one only has to record the change in one place within the network: in the DNS A record for .ĬNAME records must always point to another domain name, never directly to an IP address.ĭNS CNAME records are specified in RFC 1034 and clarified in Section 10 of RFC 2181.ĬNAME records are handled specially in the domain name system, and have several restrictions on their use. One can, for example, use CNAME records to point and to the DNS entry for, which in turn has an A record which points to the IP address. This can prove convenient when running multiple services (like an FTP server and a web server, each running on different ports) from a single IP address. For RTCP CNAME records, see RTP Control Protocol.Ī Canonical Name (CNAME) record is a type of resource record in the Domain Name System (DNS) that maps one domain name (an alias) to another (the canonical name).
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