I've always advocated returning icompetent obstinacy with enthusiastic incompetency. Such as sending them a list of every IP address used in the lab, without any note of which IP corresponds with what device in the lab. Technically, that's all they asked for.
I argee that it's likely that the IT manager didn't understand what he was asking for, either. Probably some sysop or admin told him they needed a list of 'servers running on each labs network' or something, and he interpreted it in some strange way.