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SRV record

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An SRV record is a data entry in the DNS. As opposed to the A (or AAAA) record type, it does not define the address of a specific host in a domain (like www.innovaphone.com), but a specific service provided in a domain (hence the name).

For example, if a domain provides a callable SIP service, it would be defined by an SRV record called _sip._tcp.example.com like so:
name TTL class SRV priority weight port target
_sip._tcp.example.com. 86400 IN SRV 10 60 5060 sip.example.com.
The nature of the service is denoted as a fixed string prefixed to the domain name (_sip._tcp. in our sample case). The prefix itself is defined in the RFC that defines the service (RFC3263 in our case).

Also, multiple entries may be provided to provide for load balancing and/or redundancy using the priority and weight fields.

-> www.png RFC2782 location of services (DNS SRV)

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