domain
Click on the red underlined text to get to the source
... The SRV RR allows administrators to use several servers for a single
domain, to move services from host to host ...
... Clients ask for a specific service/protocol for a specific domain
(the word domain is used here in the strict RFC 1034std13 ...
... service/protocol for a specific domain
(the word domain is used here in the strict RFC 1034std13 sense), and get
back the names of any available servers.
...
... 16 bit unsigned integer in network byte order. Domain
administrators SHOULD use Weight 0 when there isn't any server
...
... Domain administrator advice ...
... Where the services for a single domain are spread over several
hosts, it seems advisable to have a list of address ...
... Currently there's a practical limit of 512 bytes for DNS replies.
Until all resolvers can handle larger responses, domain
administrators are strongly advised to keep their SRV ...
... it is not intended that it will necessarily use SRV records. This is
(part of) the zone file for example.com, a still-unused domain:
...
... Mockapetris, P., "Domain names - concepts and facilities", STD 13, RFC 1034std13, November 1987. ...
... Mockapetris, P., "Domain names - Implementation and Specification", STD 13, RFC 1035std13, November 1987. ...
... Partridge, C., "Mail routing and the domain system", STD 14, RFC 974(-> 2821prop), January 1986. ...