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DNS SRV Record

Definition of DNS SRV Record

A DNS SRV (Service) record is a specification within the Domain Name System (DNS) that defines the location, i.e., the hostname and port number, of servers for specified services. It's a fundamental part of how internet services are accessed and routed. Unlike a standard A record, which only provides an IP address for a domain, an SRV record provides specific details like the port number and the service's priority and weight, facilitating more complex network configurations and service discovery.

Origin of DNS SRV Record

The origin of the DNS SRV record can be traced back to the late 1990s. It was introduced in 2000 as part of RFC 2782 by the Internet Engineering Task Force (IETF). The primary motivation behind its development was to enable the use of multiple servers for a single domain, thus enhancing load balancing and providing a mechanism for traffic management and failover capabilities.

Practical Application of DNS SRV Record

A practical example of DNS SRV record usage is in the Voice over Internet Protocol (VoIP) communications and email services. For instance, in the SIP (Session Initiation Protocol) used for VoIP, the SRV record allows a SIP client to locate a SIP server in a domain, facilitating seamless communication. Similarly, email services use SRV records to determine the mail servers and corresponding protocols for sending and receiving emails.

Benefits of DNS SRV Record

The benefits of using DNS SRV records are multifaceted. They provide enhanced flexibility in network configurations, allow for efficient load balancing and traffic management, and improve the redundancy and reliability of network services. By specifying the priority and weight of servers, SRV records ensure that traffic is distributed according to the infrastructure's needs and capacities, which is crucial for maintaining the performance and availability of online services.


Unlike an A record that only maps a domain to an IP address, an SRV record provides additional details like the service's specific port, priority, and weight, enabling more complex service configurations.

By allowing the specification of multiple servers with priorities and weights, SRV records enable efficient load balancing and failover, thereby enhancing the reliability and uptime of network services.

Yes, DNS SRV records are versatile and can be used for a wide range of internet services, including email, VoIP, and various web services, to specify the location and protocols of the servers handling these services.


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