Internet Assigned Numbers Authority (IANA) Procedures for the Management of the Service Name and Transport Protocol Port Number Registry

UDP Usage Guidelines

“…The rules and procedures for the management of the "Service Name and Transport Protocol Port Number Registry" are specified in [RFC6335]. Recommendations for use of UDP ports are provided in [RFC7605].…”

DNS-Based Service Discovery

“…The first label of the pair is an underscore character followed by the Service Name [RFC6335]. The Service Name identifies what the service does and what application protocol it uses to do it.…”

“…There are only 65535 TCP port numbers available. These port numbers are traditionally allocated one per application protocol [RFC6335]. Some protocols like the X Window System have a block of 64 TCP ports allocated (6000-6063).…”

“…The rules for Service Names [RFC6335] state that they may be no more than fifteen characters long (not counting the mandatory underscore), consisting of only letters, digits, and hyphens, must begin and end with a letter or digit, must not contain consecutive hyphens, and must contain at least one letter. The requirement to contain at least one letter is to disallow Service Names such as "80" or "6000-6063", which could be misinterpreted as port numbers or port number ranges.…”

NETCONF Call Home and RESTCONF Call Home

“…These ports will be the default ports for NETCONF Call Home and RESTCONF Call Home protocols. Below is the registration template following the rules in [RFC6335]. …”