81.57.30 is a class C of IPs

Sample IPs from the class C 81.57.30

81.57.30.175	View precise location of 81.57.30.175 on the map!
81.57.30.42	View precise location of 81.57.30.42 on the map!
81.57.30.225	View precise location of 81.57.30.225 on the map!
81.57.30.109	View precise location of 81.57.30.109 on the map!
81.57.30.132	View precise location of 81.57.30.132 on the map!
81.57.30.220	View precise location of 81.57.30.220 on the map!
81.57.30.227	View precise location of 81.57.30.227 on the map!
81.57.30.5	View precise location of 81.57.30.5 on the map!
81.57.30.143	View precise location of 81.57.30.143 on the map!
81.57.30.78	View precise location of 81.57.30.78 on the map!
81.57.30.77	View precise location of 81.57.30.77 on the map!

10 Random IPs

15.139.220.215	Find precise map location of 15.139.220.215
127.57.17.185	Find precise map location of 127.57.17.185
241.177.236.62	Find precise map location of 241.177.236.62
195.160.221.161	Find precise map location of 195.160.221.161
125.185.230.122	Find precise map location of 125.185.230.122
42.150.21.239	Find precise map location of 42.150.21.239
161.193.226.141	Find precise map location of 161.193.226.141
205.240.242.84	Find precise map location of 205.240.242.84
246.82.135.166	Find precise map location of 246.82.135.166
62.55.15.123	Find precise map location of 62.55.15.123
7.181.230.89	Find precise map location of 7.181.230.89

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