reply to Skippy25
Re: LOL Actually the IETF is part of the problem. rfc6598 was only published *last* month with the 100.64.0.0/10 recommended usage. Very late; after these CPE notices started going out. ISPs have been working on CGN solutions for several years now. ISPs in Japan (APNIC or Asia Pac has already run out of public IPv4 addresses) asked for this very thing several years ago of IANA/IETF and it was shot down by various factions. They are already using 10/8 in their access networks. If this had been done when originally asked then probably CPE firmware updates would not be removing use of 10/8. Although that /10 is 4 times smaller making its use a little more problematic (Comcast received a /10 alone at the end of 2010 just for their 2011 growth allocation); it requires a more complicated plan to be reused multiple times across the footprint at a large ISP (as pointed in the RFC; which by the way is not a "standard" but a only practice recommendation by its authors).