Common well-known and registered TCP and UDP ports

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Last updated 1:15 AM on 10/7/26
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29 Terms

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Port 20
FTP-DATA — TCP — File transfer-data
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Port 21
FTP — TCP — File transfer-control (server listens at 21, sends/receives data at 20)
3
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Port 22 (SSH)

SSH — TCP — Secure communications between Linux computers (or Windows if installed)

4
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Port 22 (SFTP)

SFTP — TCP — Encrypted file transfer using SSH

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Port 23
TELNET — TCP — Unencrypted control of remote computers
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Port 25
SMTP — TCP — Outgoing email messages
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Port 53
DNS — TCP or UDP — Name resolution
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Port 67
DHCP — UDP — Distribution of IP addresses (client to server messages)
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Port 68
DHCP — UDP — Distribution of IP addresses (server to client messages)
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Port 69
TFTP — UDP — Trivial (or simple) file transfer
11
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Port 80
HTTP — TCP or UDP — Requests between web servers and web clients
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Port 110
POP3 — TCP — Incoming email messages (downloaded messages)
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Port 123
NTP — UDP — Network time synchronization
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Port 143
IMAP4 — TCP — Incoming email messages (messages stored on server)
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Port 161
SNMP — TCP or UDP — Messages sent to managed network devices from SNMP manager
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Port 162
SNMP — Typically UDP — Responses or unsolicited information sent from network devices to manager
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Port 389
LDAP — TCP or UDP — Access to network-based directories
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Port 443
HTTPS — TCP — Secure implementation of HTTP over SSL or TLS
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Port 445
SMB — TCP — Network file sharing
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Port 514
Syslog — UDP — Manages and stores information about system events
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Port 587
SMTPS — TCP — SMTP encrypted by TLS
22
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Port 636
LDAPS — TCP or UDP — Secure access to network-based directories
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Port 993
IMAP4 over SSL — TCP or UDP — IMAP4 encrypted by SSL or TLS
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Port 995
POP3 over SSL — TCP or UDP — POP3 encrypted by SSL or TLS
25
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Port 1433
SQL Server — TCP — Connections to Microsoft SQL Server from other databases or applications
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Port 3389
RDP — TCP — Encrypted control of remote Windows computers
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Port 4460
NTS — TCP — NTP encrypted by TLS
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Port 5060
SIP — UDP — Creation of unencrypted connections for multimedia session
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Port 5061
SIP — UDP — Creation of encrypted connections for multimedia session