Common Network Ports & Protocols
A summarized list of common network ports and associated protocols.
Last updated
A summarized list of common network ports and associated protocols.
Last updated
Refer to for a comprehensive list of protocols and ports.
20, 21
TCP
File Transfer Protocol (FTP)
Transfer files (data) between network hosts
22
TCP
Secure Shell (SSH)
Secure remote login and command execution.
23
TCP
Telnet
Unsecure text-based remote login protocol.
25
TCP
Simple Mail Transfer Protocol (SMTP)
Protocol for sending email messages.
53
TCP/UDP
Domain Name System (DNS)
Resolves domain names to IP addresses; domain management.
67, 68
UDP
Dynamic Host Configuration Protocol (DHCP)
Assigns IP addresses dynamically to clients; IP address allocation & management.
69
UDP
Trivial File Transfer Protocol (TFTP)
Simple, unsecured file transfer protocol within LANs.
80
TCP
Hyper Text Transfer Protocol (HTTP)
Web browsing, data transfer between client and server.
88
TCP/UDP
Kerberos
Secure authentication. Tickets are used to enable nodes to prove identity.
110
TCP
Post Office Protocol version 3 (POP3)
Email retrieval from mail server.
123
UDP
Network Time Protocol (NTP)
Time synchronization; synchronizes time between network devices.
135
TCP/UDP
Remote Procedure Call (RPC)
Used for remote system management, DCOM services, and Windows networking. Dynamic Ports (TCP/UDP 49152-65535)
137, 138, 139
TCP/UDP
NetBIOS
Provides services like name resolution, sessions, and datagrams on a network.
143, 933
TCP
Internet Message Access Protocol (IMAP)
Email retrieval, server-side mailbox management.
161, 162
UDP
Simple Network Management Protocol (SNMP)
Network device monitoring and management.
194
UDP
Internet Relay Chat (IRC)
Real-time text messaging between network-connected hosts.
389
TCP
Light Weight Directory Access Protocol (LDAP)
Distribute directory service access and management (user credentials, organizational data).
443
TCP
HTTP Secure (HTTPS)
Secure web browsing and data transfer.
445
TCP
Server Message Block (SMB)
Facilitate file and printer sharing over network.
500
TCP
Internet Security Association and Key Management Protocol (ISAKM)
Defines creation & management of encryption keys and secure communication between network nodes.
587
TCP
SMTP Secure (SMTPS)
Send and retrieve email securely using encryption.
636
TCP/UDP
LDAP over SSL/TLS (LDAPS)
Secure LDAP access and management via encryption.
989, 990
TCP
FTP over SSL/TLS (FTPS)
Secure FTP.
1194
UDP
OpenVPN
Secure connection between remote nodes and servers via encryption.
1433
TCP
Microsoft SQL Server
Microsoft database server & associated protocol.
1701
TCP
Layer Two Tunneling Protocol (L2TP)
An extension of the PPTP, mainly used by ISPs to provide VPNs.
1732
TCP
Point to Point Tunneling Protocol (PPTP)
VPN protocol for creating secure connections.
3022
TCP/UDP
Network Address Translation (NAT)
Translates privates address within a LAN to a single public IP address.
3306
TCP
MySQL Server
MySQL database server and associated protocol.
3389
TCP/UDP
Remote Desktop Protocol (RDP)
Provides graphical remote desktop connections.
5432
TCP
PostgreSQL Server
5900
TCP
Virtual Network Computing (VNC)
Remote desktop sharing protocol; provides graphical remote desktop connections.
1812, 1813
UDP
Remote Authentication Dial-In User Service (RADIUS)
Provides centralized authentication for users. Authentication, authorization, and accounting (AAA).
5060, 5061
TCP/UDP
Session Initiation Protocol (SIP)
VoIP, video calls, messaging. Initiate, maintain, & terminate real-time communication sessions.
89
(Protocol ID)
Open Shortest Path First (OSPF)
Dynamic IP routing within a LAN.
179
TCP
Border Gateway Protocol (BGP)
Internet routing and path selection protocol used to exchange routing information between autonomous systems.
88
TCP
Enhanced Interior Gateway Routing Protocol (EIGRP)
Dynamic IP routing. Cisco's advanced distance-vector routing protocol.
1720
TCP
H.323
VoIP and video conferencing over IP.
50, 51
(Protocol IDs)
Internet Protocol Security (IPSec)
Encrypts and authenticates IP packets; secure IP communication.
500
UDP
Internet Key Exchange (IKE)
Establishes secure IPsec VPN tunnels. Part of the IPsec protocol suite, negotiates secure IPsec connections.
NA
-
Link Layer Discovery Protocol (LLDP)
Neighbor discovery in network environments. Used by network devices to advertise identify and capabilities.
Varies
-
Multi-Protocol Label Switching (MPLS)
Provides efficient network traffic routing and forwarding.
2049
TCP/UDP
Network File System
File sharing over a network (Unix/Linux).