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What’s an SRV record?

The SRV Record identifies the host(s) that will support particular services. The SRV record is a general purpose name server record to discover any service. The SRV record allows control over prioritisation of delivery and usage.
The theory behind SRV is that given a domain name, for instance, example.com, and a service name, for example, web (http) which runs on a protocol (tcp in the web case), a DNS query may be issued to find the host name that provides such a service for the domain - and which may, or may not, be within the domain.

  • Owner : Owner for this record (must be a hostname within this domain). E.g. _http._tcp.example.com means "http traffic via the tcp protocol within the domain example.com".
  • Priority : Priority for this record (0 to 65535). The lowest number indicate the highest priority.
  • Weight : If you use more services with the same priority, you can define a weight (0 to 65535). 0 indicate that no weighting should be applied. If the weight is 1 or higher the record with the highest number will be delivered most frequently.
  • Port : Port where the service is assigned.
  • Target : Hostname that will provide the service. Does not have to be in the same domain, but must be a fully qualified domain name (FQDN).
 

Example: _http._tcp.example.com 1 1 80 www.voorbeeld.net
An application for instance can now ask the DNS server example.com which site supports http traffic via tcp on example.com. The DNS server will reply that www.voorbeeld.net on gate 80 offers such a service. So the application knows that www.voorbeeld.net is the place to be for http traffic via the tcp protocol.
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