Now THIS is very handy!
A couple points to add:
1. I've run into a few cameras that will try DHCP first, then "fail over" to a default IP if none is provided by DHCP. I think a Panasonic was one of those. Most seem to just be one or the other out-of-the-box, though.
2. An IP scanner is handy, BUT the computer you're running it on must already be configured on the same subnet as the camera(s). Not a problem with DHCP, but if cameras are using 192.168.1.xxx but your computer is configured with 192.168.0.xxx, it won't find anything on an IP scanner (not that you'd be able to connect to those cameras anyway). Of course, there's a bunch of other parenthetical stuff here, like, this assumes you're directly connected to the same LAN as the cameras and not going through any kind of NAT or routing, etc.
IP scanners are also handy for finding other things on the network, like managed switches :)