Network reference

Common Port Reference & Search

Search a focused reference of common TCP and UDP ports by number, service name, or purpose. Filter locally without scanning a host or sending a network request.

Port ranges

System 0–1023 · User 1024–49151 · Dynamic / Private 49152–65535

Port reference

56 entries shown

Port	Protocol	IANA service name	Common use	Category
20	TCP	ftp-data	FTP data channel in active mode	File transfer
21	TCP	ftp	FTP control channel	File transfer
22	TCP	ssh	Secure Shell, SFTP, and SCP	Remote access
23	TCP	telnet	Unencrypted remote terminal	Remote access
25	TCP	smtp	Server-to-server email transfer	Email
53	TCPUDP	domain	Domain Name System queries and zone transfers	Core networking
67	UDP	bootps	DHCP server	Core networking
68	UDP	bootpc	DHCP client	Core networking
69	UDP	tftp	Trivial File Transfer Protocol	File transfer
80	TCP	http	Unencrypted web traffic	Web
88	TCPUDP	kerberos	Kerberos authentication	Authentication
110	TCP	pop3	Unencrypted email retrieval	Email
123	UDP	ntp	Network time synchronization	Core networking
137	UDP	netbios-ns	NetBIOS name service	Core networking
138	UDP	netbios-dgm	NetBIOS datagram service	Core networking
139	TCP	netbios-ssn	NetBIOS session service	File sharing
143	TCP	imap	Unencrypted email mailbox access	Email
161	UDP	snmp	Network monitoring queries	Monitoring
162	UDP	snmptrap	SNMP notifications and traps	Monitoring
179	TCP	bgp	Border Gateway Protocol routing	Core networking
389	TCPUDP	ldap	Lightweight Directory Access Protocol	Directory
443	TCPUDP	https	HTTP over TLS; HTTP/3 commonly uses UDP	Web
445	TCP	microsoft-ds	SMB file and printer sharing	File sharing
465	TCP	submissions	Email submission over implicit TLS	Email
500	UDP	isakmp	IKE and IPsec key exchange	VPN and security
514	TCP	shell	Legacy authenticated remote shell	Remote access
514	UDP	syslog	System log messages	Monitoring
515	TCP	printer	Line Printer Daemon spooler	Printing
546	UDP	dhcpv6-client	DHCPv6 client	Core networking
547	UDP	dhcpv6-server	DHCPv6 server	Core networking
587	TCP	submission	Authenticated email submission	Email
631	TCPUDP	ipp / ipps	Internet Printing Protocol	Printing
636	TCP	ldaps	LDAP over TLS	Directory
853	TCPUDP	domain-s	Encrypted DNS over TLS, DTLS, or QUIC	Core networking
989	TCP	ftps-data	FTP data over TLS	File transfer
990	TCP	ftps	FTP control over implicit TLS	File transfer
993	TCP	imaps	IMAP email access over TLS	Email
995	TCP	pop3s	POP3 email retrieval over TLS	Email
1194	TCPUDP	openvpn	OpenVPN tunnels	VPN and security
1433	TCP	ms-sql-s	Microsoft SQL Server	Database
1434	UDP	ms-sql-m	Microsoft SQL Server Browser and monitor	Database
1723	TCP	pptp	Point-to-Point Tunneling Protocol	VPN and security
1812	UDP	radius	RADIUS authentication	Authentication
1813	UDP	radius-acct	RADIUS accounting	Authentication
1883	TCP	mqtt	MQTT messaging without TLS	Messaging
2049	TCPUDP	nfs	Network File System	File sharing
3306	TCP	mysql	MySQL database	Database
3389	TCPUDP	ms-wbt-server	Microsoft Remote Desktop Protocol	Remote access
5060	TCPUDP	sip	Session Initiation Protocol signaling	Voice and video
5061	TCP	sips	SIP signaling over TLS	Voice and video
5432	TCP	postgresql	PostgreSQL database	Database
5671	TCP	amqps	AMQP messaging over TLS	Messaging
5672	TCP	amqp	Advanced Message Queuing Protocol	Messaging
5900	TCP	rfb	Remote Framebuffer and VNC	Remote access
6379	TCP	redis	Redis data store	Database
8080	TCP	http-alt	Alternate HTTP web service	Web

Quick example

What commonly uses port 443?

Port 443 is registered as HTTPS. Conventional HTTPS traffic uses TCP, while HTTP/3 carries HTTPS over QUIC and commonly uses UDP on the same port. A registration describes the expected service; it does not prove what a particular host is running.

Port ranges

How the 0–65535 port space is divided

System: 0–1023

Also called well-known ports. These include widely used foundational services such as DNS, HTTP, HTTPS, and SSH.

User: 1024–49151

Also called registered ports. Applications can request an IANA assignment in this range for a particular service.

Dynamic / Private: 49152–65535

These ports are not assigned as permanent service ports and are commonly used for temporary client connections.

TCP and UDP are separate

The same number can have an assignment in both transport protocols, and the intended service can differ between them.

Reference, not a scanner

Use registrations as a starting point

This focused list is based on the official IANA Service Name and Transport Protocol Port Number Registry and adds concise descriptions of common operational use. Port assignments are conventions: software can use another port, and an open port does not by itself identify a service. This tool never connects to or scans a host.

Common questions

Network port FAQ

What is a network port number?

A port number is a 16-bit value from 0 to 65535 that helps TCP or UDP direct traffic to a particular service or application on a host.

Does a registered port prove which service is running?

No. A registration documents an intended convention, but administrators and applications can use a port differently. Confirm a service from its configuration and protocol behavior.

Does this tool show whether a port is open?

No. This is a static reference and makes no network connections. It cannot tell whether a port on a host is open, closed, or filtered.

Can TCP and UDP use the same port number?

Yes. TCP and UDP have separate port spaces, so the same number can be assigned to both transports or can represent different services.

Search common ports

Port reference

What commonly uses port 443?

How the 0–65535 port space is divided

System: 0–1023

User: 1024–49151

Dynamic / Private: 49152–65535

TCP and UDP are separate

Use registrations as a starting point

Network port FAQ

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