[jojohohanon]

I feel like I missed a preread that teaches me about these strangle super-numeric ip addresses. Eg 400.564.987.500

Am I just seeing ipv6 in an unusually familiar format? Or is it an intentionally malformed format used by wireguard for internal routing?

[cameroncooper]

Looks like modified placeholder addresses because the author didn't want to use real addresses. I don't think it could be used for internal routing since each octet is represented with a single byte (0-255) so having larger numbers for some internal routing would likely break the entire IP stack.

[Arrowmaster]

Yes the author needs to be beaten over the head with RFC 5737.