How many characters in a hostname

If as an example I have a hostname of dc1-prod-monitoring If I deployed a second server with a hostname dc1-prod-monitoring We need to be in a position where Active Directory as an example does not have a reliance on NETBIOS which would allow for a hostname of x number of characters to match that of the computer account that is created.

Maybe I should have made the above clearer in my initial post. Products 75 Special Topics 42 Video Hub Most Active Hubs Microsoft Teams. Security, Compliance and Identity. Microsoft Edge Insider. Azure Databases. Project Bonsai. Education Sector.

Microsoft Localization. Microsoft PnP. The following sections describes changes required. The section 1 speaks about hostname length and it's character set. Sections 3 lists performance schema and sys schema columns that are affected. Section 4 discusses about various macros that deal with hostnames. Section 5 lists all the commands that are related to hostnames. Section 6 discusses about changes related to plugin.

Section 7 speaks about upgrade and Section 8 deals with fixing error messages to show long hostnames. Valid characters for hostnames are ASCII 7 letters from a to z, the digits from 0 to 9, and the hyphen -. A hostname may no start with a hyphen. And not for columns which store both username and hostname, e. See below for more details.

This will also help reduce the index element size for various metadata tables. The original specification of hostnames in RFC , mandated that labels could not start with a digit or with a hyphen, and must not end with a hyphen. However, a subsequent specification RFC permitted hostname labels to start with digits. No other symbols, punctuation characters, or white space are permitted.

A "name" Net, Host, Gateway, or Domain name is a text string up to 24 characters drawn from the alphabet A-Z , digits , minus sign - , and period. Note that periods are only allowed when they serve to delimit components of "domain style names". No blank or space characters are permitted as part of a name.

No distinction is made between upper and lower case.