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Here are common ports used by various software and services.
21 FTP Server
25 SMTP SERVER, EXIM, MAIL ENABLE, HMAILSERVER, etc
53 DNS SERVER
80 WEB SERVER (iis, apache)
110 POP3
135 Windows RPC, Remote Procedure Calls
139 NetBIOS Session (TCP), Windows File and Printer Sharing
143 IMAP
445 Windows Server Message Block, NetBIOS, File Sharing
1433 MS SQL
3306 MYSQL
3389 DRP, Windows Remote Desktop
8081 Error loading stylesheet: Parsing an XSLT stylesheet failed. (on windows 2003 servers)
8086 HELM Control Panel (windows)
9418 git demon port