Network Protocols and Their Common Ports: TCP/UDP Overview

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Last updated 12:30 AM on 8/19/26
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10 Terms

1
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Port 22 (TCP)

SSH (Secure Shell)

2
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Port 23 (TCP)

Telnet

3
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Port 49 (TCP/UDP)

TACACS+

4
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Port 20 / 21 (TCP)

FTP (File Transfer Protocol)

5
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Port 69 (UDP)

TFTP (Trivial File Transfer Protocol)

6
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Port 80 (TCP)

HTTP

7
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Port 53 (TCP/UDP)

DNS (Domain Name System)

8
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Ports 67 / 68 (UDP)

DHCP (Dynamic Host Configuration Protocol)

9
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Port 123 (UDP)

NTP (Network Time Protocol)

10
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Ports 161 / 162 (UDP)

SNMP (Simple Network Management Protocol)