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CyberGhost VPN allows you to hide your external IP and route your entire traffic over their servers. This way it becomes much harder to trace and identify your real identity, because others will see a CyberGhost IP instead of your real one. The service is completely free for everyone, although they only provide 1GB of monthly traffic for free users, while premium plans currently include between 10 and 50GB traffic.

Since many users are using the same servers and IP addresses at the same time while they are connected with the CyberGhost network, it’s also a problem for web admins to distinguish good from bad users. Banning a single address might indirectly lead to dozens of people getting banned. In addition, many bad users might use their anonymity to bypass bans or similar regulations.

Update: April, 2018

The below list from 2011 is not valid anymore. One may nowadays simply use the following URL which will return a JSON response on wether or not an IP address is part of the Cyberghost network:


https://www.cyberghostvpn.com/is-using-cyberghost?ip=84.19.169.162


Outdated post from 2011:

I created the following (incomplete) listing of IPs affiliated with the CyberGhost network:

x	Name	IP
	Amsterdam	79.141.173.22
	Andromeda	84.19.169.231
	Apus	84.19.169.162
	Ara	217.114.211.242
	Bern	82.195.234.50
	Bootes	84.19.169.168
	Bukarest	93.114.43.204
	Camelopardalis	84.19.165.216
	Cancer	217.114.211.243
	Carina	84.19.165.213
	Cetus	84.19.165.220
	Corvus	84.19.165.219
	Dorado	84.19.169.227
	Draco	84.19.169.226
	Dublin	79.141.162.7
	Eridanus	84.19.165.211
	Fillmore	67.221.255.15
	Fornax	84.19.169.169
	Gallus	84.19.169.234
	Gemini	84.19.169.165
	Grus	84.19.165.221
	Helsinki	79.141.172.14
	Horologium	84.19.169.235
	Hydra	84.19.169.173
	Indus	84.19.165.217
	Kobehavn	79.141.165.21
	Lacerta	84.19.169.228
	Leo	84.19.169.172
	Libra	217.114.211.244
	London	79.141.161.8
	Lupus	84.19.169.170
	Luzern	82.195.234.51
	Lynx	84.19.165.218
	Madrid	95.141.26.2
	Monroe	208.100.2.186
	Musca	217.114.211.245
	Norma	84.19.165.222
	Octans	85.17.161.83
	Oslo	79.141.164.5
	Pavo	84.19.169.237
	Pegasus	84.19.165.214
	Perseus	84.19.169.236
	Phoenix	84.19.169.229
	Pictor	85.17.161.82
	Pierce	67.221.255.16
	Pisces	84.19.165.215
	Praha	79.141.166.7
	Sagitta	85.17.161.84
	Scorpius	91.206.226.128
	Sculptor	84.19.169.167
	Taurus	84.19.169.174
	Tigris	84.19.169.238
	Timisoara	93.114.40.93
	Triangulum	84.19.169.232
	Virgo	84.19.169.171
	Volans	178.170.255.4
	Vulpecula	84.19.165.212
	Washington	208.100.3.173
	Warszawa	79.141.160.21

There are more servers which belong to their network, I was unable to resolve their IP adresses though:

x	Name	IP
	Adams	??? (adams.cyberghostvpn.com)
	Chamaeleon	??? (chamaeleon.cyberghostvpn.com)
	Crater	??? (crater.cyberghostvpn.com)
	Delphinus	??? (delphinus.cyberghostvpn.com)
	Jefferson	??? (jefferson.cyberghostvpn.com)
	Madison	??? probably 173.224.122.10 (madison.cyberghostvpn.com)

Update: July 4th, 2011:
I’ve resolved and added the following new servers to the list: Ara, Carina, Pisces, Perseus, Sculptor

Update: July 7th, 2011:
I’ve resolved and added the following new servers to the list: Phoenix, Virgo

Update: August 13th, 2011:
I managed to resolve the IP addresses of the following servers: Bukarest, Timisoara

Update: December 9th, 2011:
I managed to resolve the IP addresses of the following servers: Fillmore, London, Pictor, Pierce, Scorpius, Volans

Update: January 18th, 2012:
I managed to resolve the IP addresses of the following servers: Amsterdam, Dublin, Helsinki, Kobehavn, Madrid, Oslo, Praha, Warszawa