Common Port Numbers

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Last updated 7:37 PM on 10/15/26
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22 Terms

1
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FTP (Active mode data)

TCP/20

2
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FTP (Control)

TCP/21

3
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SSH

TCP/22

4
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Telnet

TCP/23

5
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SMTP

TCP/25

6
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DNS

UDP/53 then TCP/53

7
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DHCP (Client to Server)

UDP/67

8
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DHCP (Server to Client)

UDP/68

9
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TFTP

UDP/69

10
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HTTP

TCP/80

11
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HTTPS

TCP/443

12
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POP3

TCP/110

13
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POP3S

TCP/995

14
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NetBIOS

UDP/137 TCP/137 UDP/138 TCP/139

15
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IMAP4

TCP/143

16
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IMAPS

TCP/993

17
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SNMP (Queries)

UDP/161

18
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SNMP (Traps/Alarms)

UDP/162

19
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LDAP

TCP/389 UDP/389

20
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SLP

TCP/427 UDP/427

21
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SMB

TCP/445

22
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RDP

TCP/3389