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The allowed IPv4 ranges are the same as before. But we now also accept IPv6 addresses in the ULA range FC00::/7. These addresses don't require an interface identifier and are roughly equivalent to the IPv4 private ranges. Typical usecases: VPN interface IPs: Wireguard, OpenVPN, Tailscale, ... fixed IPv6 LAN addressing while the provider assigns a dynamic prefix. e.g used by pihole https://cs.opensource.google/go/go/+/refs/tags/go1.21.0:src/net/ip.go;l=146