121.56.204 is a class C of IPs

Sample IPs from the class C 121.56.204

121.56.204.234	View precise location of 121.56.204.234 on the map!
121.56.204.113	View precise location of 121.56.204.113 on the map!
121.56.204.76	View precise location of 121.56.204.76 on the map!
121.56.204.177	View precise location of 121.56.204.177 on the map!
121.56.204.155	View precise location of 121.56.204.155 on the map!
121.56.204.51	View precise location of 121.56.204.51 on the map!
121.56.204.150	View precise location of 121.56.204.150 on the map!
121.56.204.205	View precise location of 121.56.204.205 on the map!
121.56.204.16	View precise location of 121.56.204.16 on the map!
121.56.204.76	View precise location of 121.56.204.76 on the map!
121.56.204.46	View precise location of 121.56.204.46 on the map!

10 Random IPs

162.19.221.146	Find precise map location of 162.19.221.146
4.190.178.32	Find precise map location of 4.190.178.32
34.177.127.144	Find precise map location of 34.177.127.144
108.122.118.42	Find precise map location of 108.122.118.42
90.17.34.23	Find precise map location of 90.17.34.23
66.183.141.93	Find precise map location of 66.183.141.93
64.94.72.16	Find precise map location of 64.94.72.16
117.231.20.79	Find precise map location of 117.231.20.79
38.202.179.3	Find precise map location of 38.202.179.3
191.2.88.202	Find precise map location of 191.2.88.202
132.237.158.81	Find precise map location of 132.237.158.81

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