Protocols and Ports - a quick reckoner

1. DNS(Domain Name Service): 53
2. FTP(File Transfer Protocol): 20/21
3. HTTP(Hypertext Transfer Protocol or WWW): 80
4. HTTPS(SecureHypertext Transfer Protocol): 443
5. ICA(Independent Computing Architecture): 1494
6. POP(Post Office Protocol): 110
7. RDP(Remote Desktop Protocol): 3389
8. RPC(Remote Procedure Call): 135
9. SQL Server: 1433
10.SMTP(Simple Mail Transfer Protocol): 25
11.Telnet: 23

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