137.56.66 is a class C of IPs

Sample IPs from the class C 137.56.66

137.56.66.233	View precise location of 137.56.66.233 on the map!
137.56.66.6	View precise location of 137.56.66.6 on the map!
137.56.66.16	View precise location of 137.56.66.16 on the map!
137.56.66.227	View precise location of 137.56.66.227 on the map!
137.56.66.161	View precise location of 137.56.66.161 on the map!
137.56.66.50	View precise location of 137.56.66.50 on the map!
137.56.66.137	View precise location of 137.56.66.137 on the map!
137.56.66.245	View precise location of 137.56.66.245 on the map!
137.56.66.42	View precise location of 137.56.66.42 on the map!
137.56.66.118	View precise location of 137.56.66.118 on the map!
137.56.66.66	View precise location of 137.56.66.66 on the map!

10 Random IPs

76.153.209.151	Find precise map location of 76.153.209.151
2.244.192.42	Find precise map location of 2.244.192.42
178.24.68.144	Find precise map location of 178.24.68.144
54.100.124.198	Find precise map location of 54.100.124.198
188.33.66.232	Find precise map location of 188.33.66.232
202.53.103.238	Find precise map location of 202.53.103.238
28.113.81.34	Find precise map location of 28.113.81.34
41.101.88.57	Find precise map location of 41.101.88.57
219.31.183.208	Find precise map location of 219.31.183.208
205.40.12.171	Find precise map location of 205.40.12.171
76.33.218.213	Find precise map location of 76.33.218.213

TestURI.org is a free web-sniffer.net alternative. It alows you to send custom HTTP request and check the HTTP response.