[gtld-tech] number of characters in a domain?

Stephane Bortzmeyer bortzmeyer at nic.fr
Sat Jul 23 12:44:04 UTC 2016

On Sat, Jul 23, 2016 at 12:31:15PM +0000,
 Ryan Finnesey <ryan at 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

labels          63 octets or less

names           255 octets or less

Quizz: how many labels does it authorize? :-)

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