There are several:
*.googleusercontent.com
More individual entries:
127.0.0.1 googletagservice.com
127.0.0.1 googletagservices.com
127.0.0.1 google-analytic.com
127.0.0.1 google-analytic.net
127.0.0.1 google-analytic.org
127.0.0.1 google-analytics.net
127.0.0.1 google-analytics.org
www.google.com is required for reCAPTCHA in some instances.
India:
adservice.google.co.in
Other:
127.0.0.1 adservice.google.ca
127.0.0.1 adservice.google.com
127.0.0.1 adservice.google.com.au
127.0.0.1 adservices.google.com
Thanks.
It is hard to keep up with them all. And I bet there dozens, if not hundreds, of other google owned web addresses that are not obviously connected to them.
I quit doing businesses with sites that you have to enable google Java spy bots to get past recaptcha... or indeed any sites that require ANY Google java to use their site.