The ‘service’ record specifies a host and port for specific services such as Voice Over IP (VOIP), instant messaging, etc. When an application needs to find the location of a specific service, it will search for a related SRV record. If it finds one, it will sift through the list of services and their connecting hostnames to find the following:
- Hostname
- Ports
- Priority and Weight
- IP Addresses, if relevant
Example of an SRV record:
| example.com | record type: | value: | TTL |
| @_sip._tcp.example.com. | SRV | 8080 exampledomain.com | 41200 |
In the above example, ‘_sip’ indicates the type of service, ‘_tcp’ indicates the protocol, and ‘8080’ indicates the port while ‘example.com’ is the host.
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