Finding IP Addresses (OT)

[beno]

Hi;
I'm configuring my IP filter and I need to figure out what IP addresses 
I use (via SSH2) to contact my server. However, my ISP is DirecWay 
bouncing off a satellite. I've got a sample IP address from 
/var/log/messages and I'm sure over time I could collect a truckload, 
but I'd still miss some. Is there someplace on the Web that has those 
ranges of IP addresses posted that the big companies use?
TIA,
beno