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Is there a limit to the number of allowed characters for Windows computer names? If so, what is the limit?

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I've heard it will handle over 9,000 before you start to see issues. – Josh K Mar 16 '10 at 20:42
    
The text field in the dialog for changing the name on XP seems to have a 64 character limit. – FogleBird Mar 16 '10 at 20:53
    
The other issue you could run into is UNC paths. There is a max length for UNC paths (256 characters???) so if your machine name is long, and you have long share names, or deep directory structures, you could have issues. – BillN Mar 16 '10 at 23:13
    
The input field in Windows 10 let you enter a much longer name then 15 characters, but responds with "too long computer name". The question is: Which number between 15 and 63 is actually valid? – PeterCo May 19 at 10:19
up vote 26 down vote accepted

According to MS KB, maximum length varies based on the name resolution protocol.


NetBIOS computer names:
Minimum name length
1 character.

Maximum name length
15 characters.


DNS computer names:
Minimum name length
2 characters.

Maximum name length
63 characters.

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2  
Microsoft also notes this in the same article: Note Windows does not permit computer names that exceed 15 characters, and you cannot specify a DNS host name that differs from the NETBIOS host name. You might however create host headers for a web site hosted on a computer and that is then subject to this recommendation. – Jack Nov 6 '15 at 20:43

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