On Tue, Mar 28, 2017 at 11:52 AM, 建民郭 <[email protected]> wrote:
> Is it based on RFC or any other document?

   1. A "name" (Net, Host, Gateway, or Domain name) is a text string up
   to 24 characters drawn from the alphabet (A-Z), digits (0-9), minus
   sign (-), and period (.).

https://tools.ietf.org/html/rfc952 via https://tools.ietf.org/html/rfc1123
-- 
Eric Covener
[email protected]

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