Regarding cdn-cgi/trace

Website, Application, Performance DNS & Network
1

Dear Team Cloudflare,

My question relates to https://www.cloudflare.com/cdn-cgi/trace

  • Is it possible to see IPV4 address while being on IPV6 supported ISP?

Thanks

2

This should do it:
curl -4 https://www.cloudflare.com/cdn-cgi/trace

3 Likes
3

Thanks!
Any more cleaner way like by adding some query string, directly with URL?

4

What? That’s totally clean! I promise.

It’s really up to the app making the connection. This is generally selected by the operating system, but some apps, like ‘curl’ can force a specific connection. I suppose if you modified the network settings of your device, you could disable IPv6.

7 Likes
5

To my knowledge, we don’t have any test URLs which are v4 or v6 only, thus requiring the client to choose which address family (ipv4 or ipv6) is used to connect.

6

HTTP is at the wrong layer of the protocol stack to make that possible.

The best you could get is an IPv4 only hostname (IPv4.example.com) and a separate IPv6 only hostname (IPv6.example.com). But in Cloudflare, I think you can only have a v4 only
zone, or a dual stack zone, but not a v6 only zone.

3 Likes
7

Thank you Michael, that’s really a useful tip in direct URL way.

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