Where Does Cloudflare Think I Am? (wheredoescloudflarethinkiam.com)

was off by 15 miles / 24 kms for me

Off by 300 kms for me

Ir gets my zip code right but doesn't geolocate it properly. My zip code is a 0.2 sq miles.

1000km off though checking here it has the right ISP https://radar.cloudflare.com/ip

Other ip locations have the correct location.

It claims London E1W for my IPv4 and IPv6 RIPE PI space, and the same location/postcode for my EE home broadband. Generic 'London data centre' postcode? Or the location of the nearest Cloudflare POP, maybe? (Whois on the PI blocks shows a correct postcode some distance from London FWIW.)

[Edit: same location and postcode for a Vodafone UK v4 address too.]

2.33 km off for me. Pretty cool

Correct country (in the EU) but off by hundreds of kilometers. I find it rarely to be correct whenever I get a "new login from..." mail from Google or others.

Shows the town my ISP is in. Which seems like an odd approach.