With the new power-up GEO Headers you can add X-GEO-Country,X-GEO-Region,X-GEO-City, X-GEO-Ipaddress, X-GEO-PostalCode in event data inside your server Google Tag Manager.
This product includes GeoLite2 data created by MaxMind, available from https://www.maxmind.com
GEO Headers power-up is available on any plan. In order to enable it, all you need to do is log in to your stape.io account, open container, choose power-ups and click "Use" button.
Learn about how you can use the User Agent Info and GEO Headers power-ups for improved server-side tagging.
Discover what is region-specific tag behavior in Google Tag Manager and how to customize tracking based on user geographic location.