I tested them all with my own script. I just called a cgi script I wrote that writes the remote address of the browser fetching the cgi. In my main loop I look at the html coming back. If it comes from my cgi then I know the proxy worked and I output the IP. If not, I output the error. The results are below. The left column is the IP of the proxy server, the right column is the REMOTE_ADDR environment variable. You would expect them to be the same, but there are quite a few aliases, so you may think you are using a different proxy when in fact the site you are connected to will see it as the same IP as last time. There are in fact 13 unique aliases of proxies that actually work. They are at the top of the list. Here are the results:
Proxy Alias/Error 128.223.8.111:3124 128.112.139.97 128.195.54.163:3124 128.135.11.152 141.76.45.18:3124 128.31.1.14 141.76.45.18:3127 129.82.12.187 (this proxy and the next one are both 129.82.12.187)
129.74.74.15:3128 129.82.12.187 164.73.47.242:3127 146.57.249.98 146.57.249.98:3128 155.246.12.163
141.76.45.18:3128 155.246.12.163 137.226.138.156:3124 155.246.12.163 146.57.249.98:3127 169.229.50.12 134.151.255.180:3128 192.42.43.22 134.151.255.180:3124 194.36.10.154 134.151.255.180:3127 194.36.10.154 164.73.47.244:3124 204.8.155.226 204.85.191.10:3124 204.8.155.226 133.1.74.162:3128 204.8.155.226 128.195.54.163:3128 204.8.155.226 164.73.47.244:3127 204.8.155.226 212.100.132.149:3128 212.100.132.146 219.93.178.162:3128 219.93.178.162 86.105.181.238:3128 86.105.181.238 218.60.146.200:80 ( æ‹’ç»è¿žæŽ¥ ) 118.144.187.156:80 Can't connect to 118.144.187.156:80 (connect: timeout) 12.13.94.227:9090 Can't connect to 12.13.94.227:9090 (connect: timeout) 124.126.252.88:8080 Can't connect to 124.126.252.88:8080 (connect: Connection refused) 125.248.151.58:8080 Can't connect to 125.248.151.58:8080 (connect: timeout) 128.195.54.161:3124 Can't connect to 128.195.54.161:3124 (connect: Connection refused) 138.238.250.155:3124 Can't connect to 138.238.250.155:3124 (connect: Connection refused) 138.238.250.155:3128 Can't connect to 138.238.250.155:3128 (connect: Connection refused) 143.215.129.115:3124 Can't connect to 143.215.129.115:3124 (connect: timeout) 143.215.129.115:3128 Can't connect to 143.215.129.115:3128 (connect: timeout) 143.215.129.116:3124 Can't connect to 143.215.129.116:3124 (connect: timeout) 143.215.129.117:3124 Can't connect to 143.215.129.117:3124 (connect: Connection refused) 195.89.143.211:8080 Can't connect to 195.89.143.211:8080 (connect: Connection refused) 196.211.3.179:8083 Can't connect to 196.211.3.179:8083 (connect: No route to host) 200.110.130.129:3128 Can't connect to 200.110.130.129:3128 (connect: timeout) 200.110.130.43:3128 Can't connect to 200.110.130.43:3128 (connect: timeout) 200.175.44.195:80 Can't connect to 200.175.44.195:80 (connect: timeout) 200.93.149.124:8080 Can't connect to 200.93.149.124:8080 (connect: No route to host) 201.68.7.15:3127 Can't connect to 201.68.7.15:3127 (connect: Connection refused) 209.94.64.70:8080 Can't connect to 209.94.64.70:8080 (connect: timeout) 211.136.253.234:80 Can't connect to 211.136.253.234:80 (connect: Connection refused) 212.193.5.228:80 Can't connect to 212.193.5.228:80 (connect: Connection refused) 218.64.114.29:8080 Can't connect to 218.64.114.29:8080 (connect: Connection refused) 221.11.27.110:8080 Can't connect to 221.11.27.110:8080 (connect: timeout) 221.2.145.28:3128 Can't connect to 221.2.145.28:3128 (connect: timeout) 221.2.216.38:8080 Can't connect to 221.2.216.38:8080 (connect: Connection refused) 60.251.140.10:3128 Can't connect to 60.251.140.10:3128 (connect: timeout) 66.198.41.11:3128 Can't connect to 66.198.41.11:3128 (connect: timeout) 66.26.119.22:9090 Can't connect to 66.26.119.22:9090 (connect: timeout) 83.136.1.154:8118 Can't connect to 83.136.1.154:8118 (connect: timeout) 83.17.123.186:8080 Can't connect to 83.17.123.186:8080 (connect: Connection refused) 87.120.58.65:8080 Can't connect to 87.120.58.65:8080 (connect: Connection refused) 94.23.3.198:8080 Can't connect to 94.23.3.198:8080 (connect: Connection refused) 210.51.14.197:80 EOF 201.229.208.2:80 Forbidden 60.12.227.246:80 Forbidden 93.91.144.130:80 Forbidden 58.22.101.251:80 Forbidden 123.255.250.5:3128 Forbidden 150.188.8.211:80 Not Found 60.28.209.8:80 Not Found 213.246.39.67:80 Not Found 129.74.74.15:3127 OK 169.235.24.232:3127 OK 128.223.8.113:3124 OK 134.34.246.4:3124 OK 134.2.172.253:3127 OK 142.150.3.78:3127 OK 194.117.20.214:3124 OK 137.226.138.156:3127 OK 203.162.183.222:80 OK 133.1.74.163:3128 OK 89.207.240.235:3128 read timeout 211.115.185.41:8080 Service Unavailable 211.115.185.45:8080 Service Unavailable 211.115.185.50:8080 Service Unavailable 211.115.185.44:8080 Service Unavailable 211.115.185.46:8080 Service Unavailable 211.115.185.42:8080 Service Unavailable 211.115.185.43:8080 Service Unavailable