CDN-CGI is interesting, cloudflare pages would return either VIE or FRA, however my service always returns EWR.
https://cloudflare.com/cdn-cgi/trace:
fl=114f307
h=cloudflare.com
ip=censored
ts=1707263704.973
visit_scheme=https
uag=Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36
colo=VIE
sliver=none
http=http/3
loc=PL
tls=TLSv1.3
sni=plaintext
warp=off
gateway=off
rbi=off
kex=X25519Kyber768Draft00
https://censored/cdn-cgi/trace:
fl=650f64
h=censored
ip=censored
ts=1707263584.453
visit_scheme=https
uag=Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36
colo=EWR
sliver=005-tier1
http=http/3
loc=PL
tls=TLSv1.3
sni=plaintext
warp=off
gateway=off
rbi=off
kex=X25519Kyber768Draft00
My ISP is T-Mobile Poland
1 172.20.10.1 6.344 ms 5.543 ms 5.381 ms
2 10.9.33.129 118.998 ms 57.369 ms 76.524 ms
3 * * *
4 * * *
5 * * *
6 * * *
7 * * *
8 * * *
9 87.128.239.250 145.066 ms 145.816 ms 144.591 ms
10 * * *
11 66.198.70.2 325.638 ms 218.941 ms 168.813 ms
12 162.158.156.3 165.168 ms
172.70.108.2 171.685 ms
172.70.228.2 230.950 ms
13 172.67.171.164 241.315 ms 211.805 ms 160.127 ms