important ports

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Last updated 8:56 PM on 8/23/26
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14 Terms

1
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Port 20 / 21

FTP (File Transfer Protocol) - Moving files between servers.

2
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Port 22

SSH / SFTP (Secure Shell) - Securely logging into and managing Linux servers remotely.

3
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Port 25

SMTP (Simple Mail Transfer Protocol) - Sending emails between servers.

4
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Port 53

DNS (Domain Name System) - Translates website names to IP addresses (uses TCP and UDP).

5
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Port 67 / 68

DHCP (Dynamic Host Configuration Protocol) - Automatically assigning IP addresses (uses UDP).

6
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Port 80

HTTP - Standard, unencrypted web traffic.

7
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Port 123

NTP (Network Time Protocol) - Syncing clocks across servers (uses UDP).

8
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Port 389

LDAP (Lightweight Directory Access Protocol) - Active Directory queries and user authentication.

9
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Port 443

HTTPS - Encrypted web traffic and secure Azure Cloud Portal/API communication.

10
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Port 445

SMB (Server Message Block) - Sharing files and printers on a Windows network / Active Directory.

11
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Port 636

LDAPS (Secure LDAP) - Encrypted Active Directory queries.

12
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Port 1433

MSSQL - Microsoft SQL Server database traffic.

13
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Port 3389

RDP (Remote Desktop Protocol) - Graphical remote management for Windows servers.

14
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Port 5985 / 5986

WinRM (Windows Remote Management) - PowerShell and DevOps automation/management for Windows VMs without a GUI.