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Active Directory domain name length

I have a customer that has a external domain name which is 23 characters long that they want to use for a new office 365 tenant so as an example domain looks like this 23characters.com . I need to build them a new internal active directory domain and was going to use int.23characters.com but was wondering if a active directory domain name with 23 characters not including the int. or .com is to long ?
Microsoft 365Active Directory

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Shaun Vermaak

8/22/2022 - Mon
Lee W, MVP

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Great, thanks for that. The company name is 3 words so I can make the netbios name 3 characters to keep it short.

I was thinking of shortening the internal AD name but i thought it was best practice to have the internal AD domain a sub-domain of the external.
Sajid Shaik M

onpremise domain and azure ad are different things... you can create a domain and sync users ... it sync only UPN and Password which authenticates at office 365 by azure ad..

for detailed guidiance please check the following


all the best
Shaun Vermaak

You can probably then just add an shorter UPN, change it on users and sync
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