In message <cacnpsnuxta3vyqsxute4x9nxfm_o+2bp7hqmbapxcm5_g5z...@mail.gmail.com> , Scott Howard writes: > On Wed, Oct 30, 2013 at 2:33 PM, Nolan Rollo <nro...@kw-corp.com> wrote: > > > So in the four examples below, 3 of them preface the IP with an alpha > > character. Charter however, starts the rDNS off with a number. I'm not > > arguing with anyone but what potential problems could that cause with DNS? > > I'm also thinking of the famous www.1and1.com, where the number "1" > > starts off one of the sections. > > > > Using domain name parts that start with a number will likely cause issues > for anyone running resolvers written in the 80's. > > Anyone running resolvers that are less than ~25 years will likely not have > any issues. > > Scott
To be more precise it will cause no problems with the DNS. Some pre RFC 1123 gethostbyname implementations may reject the name but the DNS doesn't care. Mark -- Mark Andrews, ISC 1 Seymour St., Dundas Valley, NSW 2117, Australia PHONE: +61 2 9871 4742 INTERNET: ma...@isc.org