153.211.21 is a class C of IPs

Sample IPs from the class C 153.211.21

153.211.21.134	View precise location of 153.211.21.134 on the map!
153.211.21.105	View precise location of 153.211.21.105 on the map!
153.211.21.122	View precise location of 153.211.21.122 on the map!
153.211.21.249	View precise location of 153.211.21.249 on the map!
153.211.21.35	View precise location of 153.211.21.35 on the map!
153.211.21.16	View precise location of 153.211.21.16 on the map!
153.211.21.69	View precise location of 153.211.21.69 on the map!
153.211.21.117	View precise location of 153.211.21.117 on the map!
153.211.21.88	View precise location of 153.211.21.88 on the map!
153.211.21.97	View precise location of 153.211.21.97 on the map!
153.211.21.253	View precise location of 153.211.21.253 on the map!

10 Random IPs

58.96.31.168	Find precise map location of 58.96.31.168
252.205.167.6	Find precise map location of 252.205.167.6
126.3.88.211	Find precise map location of 126.3.88.211
170.101.154.195	Find precise map location of 170.101.154.195
7.133.125.196	Find precise map location of 7.133.125.196
112.213.124.27	Find precise map location of 112.213.124.27
57.216.187.103	Find precise map location of 57.216.187.103
39.159.21.135	Find precise map location of 39.159.21.135
253.11.249.74	Find precise map location of 253.11.249.74
70.160.160.219	Find precise map location of 70.160.160.219
226.11.183.221	Find precise map location of 226.11.183.221

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