[judge2020]

It would also probably be good to use Cloudflare's own ip lookup service, available on every CF website's "/cdn-cgi/trace" page. The only thing is that you need to find a ipv4-only CF website to get the v4 instead of v6.

[miyuru]

Accessing the cloudflare IP address directly works.

For example http://1.1.1.1/cdn-cgi/trace

[elithrar]

IIRC that's never been a public API; more of an artifact for troubleshooting/support. Relying on it / parsing it directly was never recommended when I was there.

[markovbot]

Is this documented somewhere? Are there other endpoints available by default under /cdn-cgi/? I looked around a bit but couldn't find any official documentation of this.

[kissgyorgy]

This is actually the fastest, always responds under 100ms! I put this in, thanks!

[creeble]

very groovy, thanks!

[bhhaskin]

Huh. didn't know this existed! Thanks! Is there a list of other pages cloudflare serves outside of this one?

[judge2020]

Don't think there's a list; the only other pages that I see regularly are for email protection[0], CF apps[1] (the ones that inject scripts), expect-ct (CT monitoring), and image resizing[2].

0: https://blog.cloudflare.com/introducing-scrapeshield-discove...

1: https://www.cloudflare.com/apps/

2: https://blog.cloudflare.com/announcing-cloudflare-image-resi...

[ianlevesque]

Or just have the tool open an ipv4 socket when accessing it.

[Godel_unicode]

That only works if you're not behind carrier grade NAT.

[paulfurtado]

The goal is to lookup your own public IP address to store it in a DNS record. If you're behind a carrier grade NAT, there isn't much use in that exercise, right?

[tracker1]

If you're behind a carrier NAT, would dyndns even have a purpose?