Define your IP yourself (Tested with only ICQ98)
If you want people not to see your real IP at that moment, this topic is for you. Process this easy steps :

 

1- Choose "Preferences" from ICQ Menu.

 

2- Come to "Conncetion" tab.

3- After choosing "I'm using a parmanent internet connection (LAN)" click on "I'm behind a firewall or proxy" which is in the 2nd line below it, and click on "Firewall Settings".

4- From the "ICQ Firewall Setting Wizard" window, choose "I am using a SOCKS4 proxy server" and click on "next" button.

5- Enter any IP no you want in "SOCKS Host" box at the top. Leave the "SOCKS4 Port" box with the value 1080 and click on the "next" button.

6- And click on "Done" button. Click on "OK" in the "Preferences" section. Restart ICQ.

We managed!! But what kind of advantages and disadvantages this can bring us? Firstly, as a disadvantage the message sending time will be increased and also receiving time. You can't use the chat option and file transfer option. But the most important thing, noone can see your real IP from ICQ...