On Tue, May 16, 2017 at 01:36:57PM +0200, Tobi wrote: > host 185.140.48.241 > 241.48.140.185.in-addr.arpa is an alias for > 241.192/26.48.140.185.in-addr.arpa. > 241.192/26.48.140.185.in-addr.arpa domain name pointer psp3.ntp.org. > > If you say that the above result cannot not trigger such a reject then I > would assume a timeout issue too. > I just wanted to be sure as I've never seen such a rdns reply before :-)
The first I saw it, I was also surprised. Plesantly surprised. These days I wonder why we don't see it more often?? It is named Classless IN-ADDR.ARPA delegation Quoting introduction from https://tools.ietf.org/html/rfc2317 This document describes a way to do IN-ADDR.ARPA delegation on non- octet boundaries for address spaces covering fewer than 256 addresses. The proposed method should thus remove one of the objections to subnet on non-octet boundaries but perhaps more significantly, make it possible to assign IP address space in smaller chunks than 24-bit prefixes, without losing the ability to delegate authority for the corresponding IN-ADDR.ARPA mappings. The proposed method is fully compatible with the original DNS lookup mechanisms Groeten Geert Stappers -- Leven en laten leven
