There's truly no fool-proof way to go from 1.2.3.4 to US, UK, CN, etc. IP addresses are constantly changing hands. I'm in the Southern US and yet a residential ISP I had showed up as coming from Montreal, Canada for years in many geo IP databases. A friend's house down the street sometimes gets mistaken as a Brazilian IP address.

Almost every time I've used a WAF's geo-IP blocking tool I've either personally experienced or had customers complain about being blocked incorrectly.

If you're dynamically getting IP addresses and you're allow-listing based on country of origin, expect to get locked out eventually even if you're sitting in the same place.