Well there are alot of raw numbers..you can use 2 ways to find out what number it is

1.
Code:
/debug @Debug
tells mIRC show all data sent to and from the server in @Debug, when the raw is sent, it will be in there.

2.
Code:
raw *:*:{ echo -s $numeric $1- }
echoes all raws recieved to the status window, along with the data in them.