I'm looking for a way to check if a server is support xmpp protocol, i.e. xmpp-server is running on this domain.

Maybe special DNS check or something like that?


The main default port for non-SSL jabber is 5222. You could spit some xml at it using telnet and see if you get an XML response:

telnet suspectedServer 5222
<?xml version="1.0"?>  <stream:stream to="foo.com" xmlns="jabber:client" xmlns:stream="http://etherx.jabber.org/streams" version="1.0"> 

This can of course be scripted for multiple servers and multiple ports, probably easier to script with nc (netcat).

For XMPP servers which require TLS connections, test with : -

openssl s_client -starttls xmpp -connect suspectedserver:5222

If an XMPP server is configured to work with other XMPP servers, it is possible the domain would have an SRV record in DNS. For example:

$ dig _xmpp-server._tcp.google.com srv +short
20 0 5269 xmpp-server1.l.google.com.
20 0 5269 xmpp-server4.l.google.com.
20 0 5269 xmpp-server3.l.google.com.
5 0 5269 xmpp-server.l.google.com.
20 0 5269 xmpp-server2.l.google.com.

This is by no means a definitive way to find XMPP servers, since stand-alone sites most likely do not have this data in DNS. It is, however, a nicer way to find a jabber server, since the data is published and does not require any port probing. It is also defined in RFC 3920 (the XMPP protocol definition).


There's no definitive way of checking. Nmap would give you some indication, but there would be some ethical, and possibly legal issue with running it against other people's servers.


If it's your network, you could try running something like Spiceworks across the subnet to look for systems running an XMPP server.


If this is a federation server (no, not Startrek), then you can check for the SRV DNS entries as explained here.

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