Knowledge Base

Where is the IPv4 address?

The IPv4 external address is informed on the e-mail, depending on your product (and server).

Usually, IPv4 NAT would have an internal address on the ranges 10.x.x.x, 172.x.x.x or 192.168.x.x. Since nothing stops anyone in Linux from specifying which types of addresses will be working as internal addresses, our internal addresses are not IPv4, but IPv6, which is technically possible (with translators, which we have in-place with NAT64, DNS64 and NAT46) and allowed - to use IPv4 NAT, it's irrelevant which type of internal addresses one has, it's the external public one that matters.

This way, direct IPv6-to-IPv6 communication can be used along with routing to external IPv4 and back, and routing from IPv4, as long as it's executed on the correct ports.

If you need to have an internal-formatted IPv4 on one of these ranges because your application absolutely needs to have it, check this article that gives further orientations on how to implement it on your VPS:

https://web.c-servers.co.uk/info/my-application-needs-an-ipv4-formatted-ip-on-linux-but-ip-addr-shows-ipv6s-only-how-can-i-communicate-to-from-it