Whoiswebsitebot

[keyplyr]

UA: Mozilla/5.0 (compatible; Whoiswebsitebot/0.1; +http://www.whoiswebsite.net)
Protocol: HTTP/1.1
Robots.txt: No
Host: linode.com
139.162.0.0 - 139.162.255.255
139.162.0.0/16

Another domain info utility, this one in Singapore

[aristotle]

I must be confused. What kind of whois "domain info" can it get by visiting your site?

[keyplyr]

I must be confused.

Eat more fish.

What kind of whois "domain info" can it get by visiting your site?

Quite a bit: Whether the domain is parked or in use. Whether it forwards to a different domain or not. The host. The DNS. The range. Dedicated or shared. Other domains on that IP. Type of server config, etc...

These "domain info" type businesses deal with more than "domain info."