Common Port Numbers

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Last updated 12:55 PM on 7/19/26
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17 Terms

1
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TCP 20, TCP 21

(FTP) File Transfer Protocol

2
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TCP 22

(SSH) Secure Shell / Secure File Transfer Protocol

3
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TCP 23

(Telnet) Telecommunications Network

4
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TCP 25

(SMTP) Simple Mail Transport Protocol

5
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TCP 53 or UDP 53

(DNS) Domain Name System

6
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UDP 67, UDP 68

(DHCP) Dynamic Host Configuration Protocol

7
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UDP 69

(TFTP) Trivial File Transport Protocol

8
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TCP 80

(HTTP) Hypertext Transfer Protocol

9
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TCP 110

(POP3) Post Office Protocol 3

10
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UDP 137, UDP 138, TCP 139

(NetBIOS) Network Basic Input/Output System

11
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TCP 143

(IMAP) Internet Message Access Protocol

12
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UDP 161, UDP 162

(SNMP) Server Network Management Protocol

13
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TCP 389, UDP 389

(LDAP) Lightweight Directory Access Protocol

14
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TCP 443

(HTTPS) Hypertext Transfer Protocol Secure

15
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TCP 445

(SMB) Server Message Block

16
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TCP 3389

(RDP) Remote Desktop Protocol

17
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TCP 636 or UDP 636

(LDAPS) Lightweight Directory Access Protocol Secure