/usr/lib/firewalld/services/ Current File: //usr/lib/firewalld/services/snmp.xml

<?xml version="1.0" encoding="utf-8"?>
<service>
  <short>SNMP</short>
  <description>Simple Network Management Protocol is an "Internet-standard protocol for managing devices on IP networks". Enable this service if you run SNMP agent (server).</description>
  <port protocol="tcp" port="161"/>
  <port protocol="udp" port="161"/>
</service>