Where it says:

Username
IP: 77.97.79.136

Could we not have the

IP address resolves to 77-97-79-136.cable.ubr12.live.blueyonder.co.uk

Under the IP address, I think it would make it alot easier to choose who to validate or not.

Something like this:

Username
IP: 77.97.79.136
77-97-79-136.cable.ubr12.live.blueyonder.co.uk

What do you think?

The IP address is clickable now. Hence one click and I can check those that need checking now.

Though I can see to not require to click it would make the process more efficient. Perhaps show this informaiton in a tooltip if it'll make the interface too cluttered?

I prefer not to add overhead which resolving the IP address would certainly do. Perhaps a mod is the way to satisfy the need for those who need it on every membership application. I certainly do not need it ever on address changes which also enter the validation queue.