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20 & 21
FTP - File Transfer Protocol – Port 20 for data
22
SSH - Secure Shell – Encrypted remote login
23
Telnet - Unencrypted remote login (not secure)
25
SMTP - Simple Mail Transfer Protocol – Sends email
53
DNS - Domain Name System – Resolves domain names to IP addresses
80
HTTP - HyperText Transfer Protocol – Unencrypted web traffic
110
POP3 - Post Office Protocol v3 – Retrieves email from a server
143
IMAP - Internet Message Access Protocol – Advanced email retrieval
443
HTTPS - HTTP Secure – Encrypted web traffic over SSL/TLS
3389
RDP - Remote Desktop Protocol – Windows remote GUI access