NETWORK PORT REFERENCE LIST

Port	Protocol	Service	Description
20	TCP	FTP (Data)	File Transfer Protocol (data)
21	TCP	FTP (Control)	File Transfer Protocol (control)
22	TCP	SSH	Secure remote login
23	TCP	Telnet	Unsecured remote login (legacy)
25	TCP	SMTP	Sending email
53	TCP/UDP	DNS	Domain Name Resolution
67	UDP	DHCP (Server)	Dynamic IP allocation
68	UDP	DHCP (Client)	Dynamic IP assignment
80	TCP	HTTP	Web traffic
110	TCP	POP3	Incoming email
123	UDP	NTP	Time synchronization
143	TCP	IMAP	Email retrieval
443	TCP	HTTPS	Secure web traffic
445	TCP	SMB	File/printer sharing (Windows)
3389	TCP	RDP	Remote Desktop Protocol

Port	Protocol	Service	Description
135	TCP/UDP	RPC	Remote Procedure Call
137-139	UDP	NetBIOS	Windows file & printer sharing
161	UDP	SNMP	Network monitoring
162	UDP	SNMP Trap	Alerts from SNMP devices
389	TCP/UDP	LDAP	Directory Services (Active Directory)
636	TCP	LDAPS	Secure LDAP
3268	TCP	Global Catalog	Active Directory queries across domains
3306	TCP	MySQL	Database traffic
5432	TCP	PostgreSQL	PostgreSQL DB traffic
5900	TCP	VNC	Remote GUI access
5985	TCP	WinRM (HTTP)	Windows Remote Management
5986	TCP	WinRM (HTTPS)	Secure remote management
8080	TCP	HTTP-Alt	Web server alternative port
8443	TCP	HTTPS-Alt	Secure web admin interfaces

Port	Protocol	Service	Description
1194	UDP	OpenVPN	Secure VPN tunnel
1701	UDP	L2TP	VPN tunneling
1723	TCP	PPTP	VPN tunneling (legacy)
500	UDP	IKE/IPSec	VPN encryption handshake
4500	UDP	IPSec NAT-T	VPN through NAT

¶ 🌐 Basic & Advanced Network Port Reference List