SRV Recordp>The SRV Record is a specification of data in the Domain Name System (DNS) defining the location (i.e. the hostname and port number) of servers for specified services. It is frequently used when configuring SIP or some other third-party service.
The service of SRV record has the following components:
Service: The symbolic name of the desired service.
Protocol: The transport protocol of the desired service; this is usually either TCP or UDP.
Name: The domain name for which this record is valid, ending in a dot.
TTL: The standard DNS time to live field.
The SRV record has the following look in your ICBS SYSTEMS Control Panel:
|_service._protocol e.g.: _sip._tcp*||SRV||hostnameofthemashine.com.||1 Hour|
*This hostname is used as an example.
Why do you need an SRV record?
Let say you want to run a video or/and audio connection on a specific port of your server. Typically, you will use the SIP protocol to regulate this communication. And here is where the SRV record comes in. It allows you to specify how your domain name handles this particular service.
How to create a DNS SRV record?
Go to your Control Panel and click on Add new record. Type, as follow:
- Type: SRV
- TTL: 1 Hour
- Host: _service._protocol e.g.: _sip._tcp
- Priority: (From 0 to 65535) The priority of the target host, lower value means more preferred.
- Weight: From 0 to 65535) A relative weight for records with the same priority, higher value means more preferred.
- Port: (From 0 to 65535) The TCP or UDP port on which the service is to be found.
- Points to: The canonical hostname of the machine providing the service, ending in a dot.
SRV record VS CNAME record
CNAME's role is quite trivial. It simply maps a certain hostname of your domain to another hostname or domain. The SRV purpose is a bit more complicated. It defines a host of your domain for which a certain service is supported.
SRV record VS A record
As the most commonly used resource record, the DNS "A" record is used for Forwarding DNS Resolution. It just points your hostname to an IP address. And the SRV is used to specify the location (hostname and port number) of specific service and how does your domain handle that service.
How to start managing SRV records for your domain name?
- Open free trial account from here - free forever
- Verify your e-mail address
- Log into your control panel
- Create new Master DNS from the [add new] button - read more here
- Add the SRV record(s) you need as it is described in this article
Support of SRV records
ICBS SYSTEMS provides full support for SRV records for all our DNS services, including the listed below. Just write to our technical support, if you need any assistance with your SRV records configuration. Our Technical Support team is online for you 24/7 via live chat and tickets.
Question: I can't see where to fill my service and protocol. Am I doing something wrong?
Answer: The crucial moment here is that there aren't any separate fields for service and protocol. You must add them in the Host field with your hostname, like _sip._tcp.hostname for example.
Question: What are the differences between Priority and Weight?
Answer: The Priority defines which SRV record of the target host will be preferenced. Lower value means more preferred. And the Weight parameter represents the relative weight for records with the same priority. Higher value means more preferred.