It's a sample of IPs that have recently been looked up, which doesn't necessarily mean that IP visited the site or used the API.

@prawn (sorry can't reply directly) - interesting, I didn't think this was a big deal at all. Can you explain your reservations?

The page is actually only there for SEO purposes, so that google indexes these IPs without me having to go to the trouble of building a site map. If there's genuine concerns or issues with that page then I'll kill it.

I wouldn't use the service as long as recent look-ups were publicised.