SRV Record

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A Service record also known as a SRV record provides information about specific services such as HTTP, FTP, LDAP, TCP, UDP etc. An SRV Record has 4 fields the Service or protocol, weight, port number and hostname.

An example of an SRV Record is below.

Example of an SRV Record
Service  Protocol  TTL  Priority  Weight  Port  Resolves to
_autodiscover _tcp 30 10 10 443 webmail.loadmail.com.

  • Service: Defines the symbolic service name (see IANA port-numbers) prepended with a '_' (underscore).
  • Protocol: Defines the protocol name (see IANA service-names) prepended with a '_' (underscore). Case insensitive. Common values are
    • _tcp - TCP protocol
    • _udp - UDP protocol
  • TTL (Time to Live):  The TTL number 1200  is in seconds and corresponds to how long the record stays cached in other systems.  The lower the number the more frequent systems will go to the DNS servers for queries.
  • Priority:  The relative Priority of this service (range 0 - 65535). Lowest is highest priority, usage is the same as the MX pref field.
  • Port:  Normally the port number assigned to the symbolic service but this is not a requirement, for instance, it is permissible to define a _http service with a port number of 8100 rather than the more normal port 80.
  • Resolves To: The Resolves To field is the destination mail server 

     

    See also:
    Resource Record

     

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