User creates many accounts - track IP address??

My configuration requires pre-approval, but I suspect some people are trying to spam by asking a question about something, create another account and answering it to promote their product/service. Some of this is within the same day, which is unusual for my forum.

I just noticed if I mouse over "Block Poster's IP" I get the IP address. Is this the only way to see the IP? It would be more convenient if it was displayed in the header, this would allow for much quicker review of the IPs.