ejabberd/data/conf.d/44-irc.yml

listen:
-
   port: 5347 # default port as per https://doc.biboumi.louiz.org/9.0/admin.html
   ip: "::"
   module: ejabberd_service
   access: all
   password: "secret"
   hosts:
     IRCDOMAIN
     #"irc.im.example.com":
     #  password: "SecretPasswortBetweenEjabberdAndBiboumi"