## C.3 DiscoveryUrl Mapping

An DiscoveryUrl has the form:

scheme://hostname:port/path


scheme: the protocol used to establish a connection.

hostname: the domain name or IPAddress of the host where the Server is running.

port: the TCP port on which the Server is to be found.

path: additional data used to identify a specific Server.

Table 70 – DiscoveryUrl to DNS SRV and TXT Record Mapping

URL Field Mapping
scheme The scheme maps onto SRV record service field.
The following mappings are defined at this time:
opc.tcp   _opcua-tcp._tcp.
opc.wss   _opcua-tls._tcp.
https   _opcua-https._tcp.
The first two are OPC UA service names assigned by IANA.