<reference anchor="SERVICE-NAMES-PORT-NUMBERS" target="http://www.iana.org/assignments/service-names-port-numbers">
<front>
<title>
Service Name and Transport Protocol Port Number Registry
</title>
<author>
<organization>IANA</organization>
</author>
<date/>
</front>
</reference>
Data source is available here:
https://github.com/ietf-ribose/iana-registries
e.g. https://raw.githubusercontent.com/ietf-ribose/iana-registries/main/service-names-port-numbers/service-names-port-numbers.xml
Output in a manner like https://xml2rfc.tools.ietf.org/public/rfc/bibxml-iana/reference.IANA.service-names-port-numbers.xml