The SRV record
The SRV (service) record is an enhancement of the
AAAA records, used to return not just addresses, but address–port combinations.
Here, we query for
SRV records of the domain
The result is a record that specifies a service with the address
dns.lookup.dog:5000, with priority 10 and weight 20.
$ dog SRV srv-example.lookup.dog SRV srv-example.lookup.dog. 1h00m00s 10 20 "dns.lookup.dog.":5000 A dns.lookup.dog. 53m49s + 22.214.171.124
In the Additional section of the response, specified by the
+ character, the IPv4 address of the service is also returned, to save another request from being made.