On 23 Jul 2016, at 8:44, Stephane Bortzmeyer wrote:
On Sat, Jul 23, 2016 at 12:31:15PM +0000, Ryan Finnesey <ryan@finnesey.com> wrote a message of 5 lines which said:
I was hoping someone can help me confirm my research. I am correct that domains are now limited to 67 characters in length including the extension?
"Extension" is for file names, not for domains.
Otherwise, easy question, see RFC 1035 :
2.3.4. Size limits
Various objects and parameters in the DNS have size limits. They are listed below. Some could be easily changed, others are more fundamental.
labels 63 octets or less
names 255 octets or less
I would like to emphase here that this is the number of octets, not the number of characters. For example, if one is using idn, then the idn is encoded into punycode and a prefix is added (xn—) therefore costs many octets for a single character when encoded. Marc.
Quizz: how many labels does it authorize? :-)