In message <CACnPsNUxTa3vYQSxuTE4x9NXFm_o+2Bp7HqMBApXcm5_G5Zr2Q@mail.gmail.com> , Scott Howard writes:
On Wed, Oct 30, 2013 at 2:33 PM, Nolan Rollo <nrollo@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: marka@isc.org