An SRV record is an advanced type of DNS record that allows you to specify certain services your domain offers. Use an SRV record if a certain application or software requires this.

For example you may point out that your domain allows FTP services. This can be done with a simple CNAME record, specifying a subdomain to the FTP server, but by using an SRV record you may specify more information:

• The service name (e.g. _ftp)
• The protocol (e.g. _tcp)
• The port number of this service (e.g. 21)
• The priority (a number that passes what record must be chosen if multiple SRV records exist)
• The weight (another number that passes which records must be used more frequently if multiple SRV records are available for the same name and protocol)