Let me add a couple of suggestion on how to find out some of the ops of a channel when you are unable to join. Although these methods usually don't work, why not give them a try.
1) You can try the /names command like this:
/names #channelname
You may see a list of nicknames. Look for a nickname that has an @ sign in front of it. If there's any, they are the channel ops.
2) You can also try the /topic command to see who has set the topic.
/topic #channelname
You may see a line like this:
topic set by nickname
That nickname is possibliy a channel op.
