On Wed, Dec 17, 2025 at 11:08 AM Christopher Morrow <morrowc.lists@gmail.com> wrote:
On Wed, Dec 17, 2025 at 12:06 AM William Herrin via NANOG <nanog@lists.nanog.org> wrote: I don't think, really, there was ever any REAL hope that 100.64 was
If you know it's 4.10 space (not address space allocated under a different policy section) and you know they're using it for plain IPv4 or generic dual stack, please file a report at https://account.arin.net/public/fraud
Is it abuse/fraud if the LIR is treating this as RFC1918 / private space?
Hi Chris, Did I miss the part where we pivoted to talking about RFC 6598 space? I thought we were talking about ARIN NRPM 4.10 space. An ISP can employ 100.64.0.0/10 (RFC 6598 space) any way they choose. ARIN is not a party to that process. It's usually not a good idea to use 100.64.0.0/10 for anything other than numbering downstream customers in conjunction with CGNAT, but that's an operational choice for the ISP. Regards, Bill Herrin -- For hire. https://bill.herrin.us/resume/