21.107.152 is a class C of IPs

Sample IPs from the class C 21.107.152

21.107.152.32	View precise location of 21.107.152.32 on the map!
21.107.152.161	View precise location of 21.107.152.161 on the map!
21.107.152.150	View precise location of 21.107.152.150 on the map!
21.107.152.155	View precise location of 21.107.152.155 on the map!
21.107.152.132	View precise location of 21.107.152.132 on the map!
21.107.152.29	View precise location of 21.107.152.29 on the map!
21.107.152.5	View precise location of 21.107.152.5 on the map!
21.107.152.239	View precise location of 21.107.152.239 on the map!
21.107.152.31	View precise location of 21.107.152.31 on the map!
21.107.152.72	View precise location of 21.107.152.72 on the map!
21.107.152.7	View precise location of 21.107.152.7 on the map!

10 Random IPs

242.36.25.51	Find precise map location of 242.36.25.51
97.91.47.104	Find precise map location of 97.91.47.104
171.98.75.171	Find precise map location of 171.98.75.171
208.137.69.28	Find precise map location of 208.137.69.28
177.148.65.102	Find precise map location of 177.148.65.102
151.16.184.54	Find precise map location of 151.16.184.54
33.230.65.121	Find precise map location of 33.230.65.121
90.99.58.14	Find precise map location of 90.99.58.14
247.30.101.32	Find precise map location of 247.30.101.32
127.99.65.79	Find precise map location of 127.99.65.79
240.243.30.125	Find precise map location of 240.243.30.125

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