WHOIS is generally very reliable - there are identity checks when you register for IP space (especially with ARIN, which is who provides Google's IP space).

One other way you can check is by looking at the organisation handle in the WHOIS - it's GOGL, which is the same org handle as you'll find on all their IP addresses if you WHOIS them. That ties up with the ARIN site:

http://whois.arin.net/rest/org/GOGL

I've done a fair bit of network engineering and I'm convinced that this is actually a Google address.

I upvoted you, but WHOIS is quite reliable for checking domain names. It's also part of a /16 block, i.e. 65,000 IP addresses. They don't just give those out willy-nilly, you need to explain how and why you need them. A 2 bit operation with a name that sounds like a massive internet company can't just get a /16.

Those IP addresses are assigned to Google.

(Obvious caveat, just cause they're assigned to Google doesn't mean this is a Google mandated operation. Other explainations: Rougue Employees, Rouge Outsources, compromised PC in Google office, Google App Engine, etc.)