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FTP (File Transfer Protocol)
tcp/20 (active data mode), tcp/21 (control)
SSH (Secure Shell)
tcp/22
Telnet (Telecommunication Network)
tcp/23
SMTP (Simple Mail Transfer Protocol)
tcp/25
DNS (Domain Name System)
udp/53
DHCP (Dynamic Host Configuration Protocol)
udp/67 (server), udp/68 (client)
HTTP (Hypertext Transfer Protocol)
tcp/80
HTTPS (Hypertext Transfer Protocol Secure)
tcp/443
POP3 (Post Office Protocol version 3)
tcp/110
IMAP4 (Internet Message Access Protocol, version 4)
tcp/143
SMB & CIFS (Server Message Block) (Common Internet File System)
tcp/445
SNMP (Simple Network Management Protocol)
udp/161 (queries), udp/162 (traps)
LDAP (Lightweight Directory Access Protocol)
tcp/389
RDP (Remote Desktop Protocol)
tcp/3389
NBNAME (NetBIOS Name Service)
udp/137
NBSESSION (NetBIOS Session Service)
udp/139
Non-Ephemeral Ports
-permanent port numbers
- ports 0 through 1023
Ephemeral Ports
- temporary port numbers
- determined in real-time by the client
- ports 1024 through 65535