Available RAW IRC commands?

Not sure where else to ask something like this.
What are the available IRC commands for irc.twitch.tv?

I tried NAMES, MOTD, TOPIC etc but the server returns unknown command.
I want to get the count of viewers in the channel without using the API.

You can’t.

The available commands: NICK, PASS, PING, PRIVMSG, and JOIN.

you can count the number of users based on JOIN/PARTs but you’ll have to code it. it can’t be done with a command.

Keep in mind that the number of users in chat is not the same as the number of stream viewers.

As I solution I just decided to add users to a list on JOIN, PART or PRIVMSG, with checks in place to do it only once ofcourse.