How many characters are allowed in various administrative names?

Domain name: 31
Notes named network: 31
Organization (O) name: 3 (min) to 64 (max), or 2 (min) if you include Country code
Organizational unit (OU) name: 32
Common name (CN): 80
Server name: 79
User name: 79
Group name: 62
Country code (C): 2 (or 0 since it is optional)
Port: No maximum