"Shulgin, Oleksandr" <oleksandr.shul...@zalando.de> writes:
> On Mar 20, 2016 01:09, "Dmitrii Golub" <dmitrii.go...@gmail.com> wrote:
>> Alex, actually subdomain can start with digit,

> Not according to the RFC you have linked to.

The powers-that-be relaxed that some time ago; I assume there's a newer
RFC.  For instance, "163.com" is a real domain:

$ dig 163.com
;163.com.                       IN      A

163.com.                600     IN      A
163.com.                600     IN      A

163.com.                4516    IN      NS      ns3.nease.net.
163.com.                4516    IN      NS      ns2.nease.net.

$ whois 163.com
Registry Registrant ID: 
Registrant Name: Domain Admin
Registrant Organization: Guangzhou NetEase Computer System Co., Ltd
Registrant Street: No. 16, Keyun Road, Tianhe District, 
Registrant City: Guangzhou
Registrant State/Province: Guangdong
Registrant Postal Code: 510665
Registrant Country: CN
Registrant Phone: +86.2085106370
Registrant Phone Ext: 
Registrant Fax: +86.2085106370
Registrant Fax Ext: 
Registrant Email: nsad...@corp.netease.com

                        regards, tom lane

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