136.21.37 is a class C of IPs

Sample IPs from the class C 136.21.37

136.21.37.192	View precise location of 136.21.37.192 on the map!
136.21.37.241	View precise location of 136.21.37.241 on the map!
136.21.37.172	View precise location of 136.21.37.172 on the map!
136.21.37.56	View precise location of 136.21.37.56 on the map!
136.21.37.243	View precise location of 136.21.37.243 on the map!
136.21.37.157	View precise location of 136.21.37.157 on the map!
136.21.37.233	View precise location of 136.21.37.233 on the map!
136.21.37.243	View precise location of 136.21.37.243 on the map!
136.21.37.108	View precise location of 136.21.37.108 on the map!
136.21.37.123	View precise location of 136.21.37.123 on the map!
136.21.37.125	View precise location of 136.21.37.125 on the map!

10 Random IPs

33.146.75.199	Find precise map location of 33.146.75.199
152.177.89.20	Find precise map location of 152.177.89.20
102.129.88.154	Find precise map location of 102.129.88.154
72.88.253.135	Find precise map location of 72.88.253.135
246.104.72.33	Find precise map location of 246.104.72.33
94.115.249.5	Find precise map location of 94.115.249.5
195.80.137.186	Find precise map location of 195.80.137.186
96.90.242.155	Find precise map location of 96.90.242.155
28.155.149.37	Find precise map location of 28.155.149.37
177.21.39.40	Find precise map location of 177.21.39.40
72.187.11.163	Find precise map location of 72.187.11.163

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