I have designed a Google web form. This form is sent to number of clients. All the fields that are submitted are recorded to Google spreadsheet. I need to capture the IP Addresses of clients and time-stamp to spreadsheet when client updates his information.
How can I make the client to include its own IP address to store it in spreadsheet?
To make the clients to include their own IP address in a Google Form you should ask them to write the IP address themselves.
The alternative is to pre-populate the answers and send the custom URL to them. For identification purposes, if you don't know the IP address, instead use a unique ID.
References
Pre-populate form answers - Docs editor Help