ports

Network Ports Cheatsheet

This cheatsheet covers common network ports used in day-to-day operations as a system engineer.

🌐 Web Services

Service	Port Number	Protocol	Description
HTTP	80	TCP	Standard port for HTTP traffic.
HTTPS	443	TCP	Secure HTTP traffic (encrypted with SSL/TLS).

🗂️ File Transfer

Service	Port Number	Protocol	Description
FTP	21	TCP	File Transfer Protocol (control port).
FTPS	990	TCP	FTP Secure (FTP over SSL/TLS).
SFTP	22	TCP	Secure File Transfer Protocol (SSH).

🔒 Remote Administration

Service	Port Number	Protocol	Description
SSH	22	TCP	Secure Shell for remote administration.
Telnet	23	TCP	Remote terminal connection (not secure).
RDP	3389	TCP	Remote Desktop Protocol (remote desktop access).

📧 Email Services

Service	Port Number	Protocol	Description
SMTP	25	TCP	Simple Mail Transfer Protocol (email sending).
IMAP	143	TCP	Internet Message Access Protocol (email retrieval).
POP3	110	TCP	Post Office Protocol 3 (email retrieval).

📡 DNS & Directory Services

Service	Port Number	Protocol	Description
DNS	53	UDP/TCP	Domain Name System (resolves domain names).
LDAP	389	TCP/UDP	Lightweight Directory Access Protocol.
LDAPS	636	TCP	Secure LDAP over SSL.

🛠️ Network Management

Service	Port Number	Protocol	Description
SNMP	161	UDP	Simple Network Management Protocol (monitoring).
NTP	123	UDP	Network Time Protocol (time synchronization).

🗄️ Database Services

Service	Port Number	Protocol	Description
MySQL	3306	TCP	MySQL Database Service.
MongoDB	27017	TCP	MongoDB Database Service.
PostgreSQL	5432	TCP	PostgreSQL Database Service.
Redis	6379	TCP	Redis Database Service.
MongoDB Admin	27018	TCP	MongoDB administrative service.

🖥️ Miscellaneous Services

Service	Port Number	Protocol	Description
VNC	5900	TCP	Virtual Network Computing (remote access).
SMB	445	TCP	Server Message Block (file sharing).
Git	9418	TCP	Git protocol (used by GitHub, GitLab).
ElasticSearch	9200	TCP	ElasticSearch HTTP port.

🚪 Reserved & Well-Known Ports

Port Range	Description
0 - 1023	Well-known ports for common services (e.g., HTTP, FTP, SMTP, etc.).
1024 - 49151	Registered ports for other specific services.
49152 - 65535	Dynamic or private ports used for ephemeral connections.

Important Notes:

• Always use secure versions of protocols (e.g., SFTP instead of FTP, SSH instead of Telnet).
• Change default ports for sensitive services to enhance security.
• Ensure firewall rules and access control lists (ACLs) are configured correctly to allow/deny traffic on these ports.