nanog mailing list archives
Re: Making Use of 240/4 NetBlock
From: Masataka Ohta <mohta () necom830 hpcl titech ac jp>
Date: Fri, 11 Mar 2022 13:44:21 +0900
William Herrin wrote:
Ever since we started our study, we were quite puzzled by why the 240/4 netblock was regarded so special? Why no one could tell us what led to its current status, and even after IPv4 was set to transition to IPv6?
https://www.iana.org/assignments/iana-ipv4-special-registry/iana-ipv4-special-registry.xhtml Which leads to RFC 1112 section 4, the disposition of which last changed in 1989.
IIRC, at some time, perhaps when CIDR was deployed widely and having something other than IPv4 was a hot topic, there was a discussion on releasing 240/4 in IETF. Reasonings against it were that the released space will be consumed quickly (at that time, NAT already existed but was uncommon) and that new IP will be designed and deployed quickly (we were optimistic). Masataka Ohta
Current thread:
- Re: Making Use of 240/4 NetBlock, (continued)
- Re: Making Use of 240/4 NetBlock John R. Levine (Mar 09)
- Re: Making Use of 240/4 NetBlock John Kristoff (Mar 09)
- Re: Making Use of 240/4 NetBlock David Conrad (Mar 09)
- Re: Making Use of 240/4 NetBlock John Levine (Mar 09)
- Re: Making Use of 240/4 NetBlock Masataka Ohta (Mar 09)
- Message not available
- 202203081821.AYC Re: 202203071610.AYC Re: Making Use of 240/4 NetBlock Abraham Y. Chen (Mar 09)
- Re: 202203071610.AYC Re: Making Use of 240/4 NetBlock William Herrin (Mar 09)
- Re: 202203071610.AYC Re: Making Use of 240/4 NetBlock William Herrin (Mar 10)
- Re: Making Use of 240/4 NetBlock Masataka Ohta (Mar 10)
- Re: Making Use of 240/4 NetBlock Greg Skinner via NANOG (Mar 11)
- Re: Making Use of 240/4 NetBlock JORDI PALET MARTINEZ via NANOG (Mar 12)
- Re: Making Use of 240/4 NetBlock William Herrin (Mar 12)
- Re: Making Use of 240/4 NetBlock JORDI PALET MARTINEZ via NANOG (Mar 12)
- Re: Making Use of 240/4 NetBlock Joe Maimon (Mar 13)
- Re: Making Use of 240/4 NetBlock William Herrin (Mar 13)
- Re: Making Use of 240/4 NetBlock Christopher Morrow (Mar 13)
- Re: Making Use of 240/4 NetBlock Joe Maimon (Mar 13)
- Re: Making Use of 240/4 NetBlock William Herrin (Mar 13)
- Re: Making Use of 240/4 NetBlock Christopher Morrow (Mar 13)