Hi.  Just wanted to ask if there is a directory that could tell me,
given the IP address of my subscribers, which city they subscribed
from?

Thank you for your help.

Hello amirehsans-ga,


The following IP Address Locator Tool will give you the information
you are seeking.
http://www.geobytes.com/IpLocator.htm?GetLocation


This IP Address Map lookup service is provided for FREE by Geobytes,
Inc to assist you in locating the geographical location of an IP
Address. When you enter an IP address you will be able to obtain the
following information:
  

- Country
- City
- Latitude
- Longitude
- Capital City
- Time Zone
- Currency
- Distance to Nearby Cities

Geobytes Inc
http://www.geobytes.com/IpLocator.htm?GetLocation


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Another good tool is IP2 Location.

There is a demo available for download 
http://www.ip2location.com/

You may also use their online live demo application.
(Limited to 20 lookups per day only)
http://www.ip2location.com/free.asp


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Search Criteria:
find city by IP address 
IP address search
City from IP address


I hope this helps. If anything is unclear please request clarification
and I'll be glad to offer further assistance before you rate my
answer.

Best Regards,
Bobbie7-ga

Just a note that the services listed in the answer above provide the
location information for the subscriber's ISP, which could be in a
different city, state, or even country.

answerguru-ga

Thanks to both of you guys for helping me out!