Right that does work without spaces. But its still really screwed up.

If you enter an IP without a subnet, it appears to work but doesn't actually do anything.

If you enter one with a subnet, it works. However, if you try to add more than one with a subnet, it just dissapears after hitting apply.

All I want to do is block everything except 192.168.1.220, 192.168.2.220, 192.168.3.220, and 192.168.4.220. It appears this is impossible to do.

Also, you can only enter the subnet as short form. Long form doesn't work despite what the manual says (not that I care about this).