138.57.16 is a class C of IPs

Sample IPs from the class C 138.57.16

138.57.16.255	View precise location of 138.57.16.255 on the map!
138.57.16.54	View precise location of 138.57.16.54 on the map!
138.57.16.62	View precise location of 138.57.16.62 on the map!
138.57.16.98	View precise location of 138.57.16.98 on the map!
138.57.16.123	View precise location of 138.57.16.123 on the map!
138.57.16.17	View precise location of 138.57.16.17 on the map!
138.57.16.15	View precise location of 138.57.16.15 on the map!
138.57.16.162	View precise location of 138.57.16.162 on the map!
138.57.16.69	View precise location of 138.57.16.69 on the map!
138.57.16.8	View precise location of 138.57.16.8 on the map!
138.57.16.119	View precise location of 138.57.16.119 on the map!

10 Random IPs

231.172.3.198	Find precise map location of 231.172.3.198
114.240.16.165	Find precise map location of 114.240.16.165
141.143.91.225	Find precise map location of 141.143.91.225
32.26.153.160	Find precise map location of 32.26.153.160
123.210.214.90	Find precise map location of 123.210.214.90
172.176.98.1	Find precise map location of 172.176.98.1
31.59.210.157	Find precise map location of 31.59.210.157
101.53.198.22	Find precise map location of 101.53.198.22
102.144.159.19	Find precise map location of 102.144.159.19
167.120.159.118	Find precise map location of 167.120.159.118
183.30.31.75	Find precise map location of 183.30.31.75

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