Get User's IP Address on Web Service

Hi experts,

I have created a Web Service and all is working just fine.

For tracking purposes, I would like to know the UserName & from which IP address did my web service get invoked.

What do I need to do to extract the IP address from the web service request?

Is there any Table / TCode that store User Name & IP Address of user who call my Web Service?

Thanks for any hints/tips.

JC