Can i configure same the api to get location for multiple sub domains?

Yes it is possible to use the same Geo Location service API code for multiple websites / sub domains.

You will need to change the 'Website URL' field in the settings to 'http://*'

This is a wild card URL and will allow the service to work on any domain.

However we strongly recommend NOT to do this as it allows anyone to make use of your Geo Location service in their website.

Also by using separate Geo Location services for each website as you will get usage data for each site.