Google Datacenters are located at specific IP Addresses, these IP addresses have 4 set of numbers, 010.020.030.040, separated by decimal places. In the number I just used, 010 is set “A”, 020 is set “B”, 030 is set “C”.

IP Addresses are generally grouped together like this group of Google IP Addresses

64.233.161.99
64.233.161.104
64.233.161.105
64.233.161.107
64.233.161.147

The highlighted first three part is the C-Block (the first 3 sets of numbers)

Google has 10,000 servers spread in 13 data centers which are located in different places Check few of Google Domain names and IP addresses of different google’s data centers as below;

www-ab.google.com 216.239.51.100
www-in.google.com 216.239.53.100
www-fi.google.com 216.239.41.100
www-gv.google.com 216.239.59.100
www-kr.google.com 66.102.11.100
www-mc.google.com 66.102.7.100
www-lm.google.com 66.102.9.100
www-ex.google.com 216.239.33.100
www-sj.google.com 216.239.35.100
www-va.google.com 216.239.37.100
www-dc.google.com 216.239.39.100
www-zu.google.com 216.239.55.100
www-cw.google.com 216.239.57.100