is there a charcater limit for attribute table headers

[AlexGeritz]

In arcmap online, is there a character limit for the headers of the data in the attribute table?

Example: Column 'A' can have how many characters before it maxes out?

I hope this isn't too obscure of a question...

[DanPatterson_Retired]

You mean field names character limits, I am guessing...

File geodatabase size and name limits—Help | ArcGIS for Desktop

Defining fields in tables—Help | ArcGIS for Desktop

some tidbits from the latter... it all depends on where the table is from

Field names in the same table must be unique; for instance, you can't have two columns with the name ObjectID. Field names must also start with a letter and not contain spaces or reserved words. Field names are limited to 64 characters for both file and personal geodatabases, 31 characters in SQL Server and SQLExpress, 30 characters in Oracle and DB2; dBASE is limited to 10 characters.