Cybersecurity & Auditing

Port Number Reference & Service Lookup

Search common TCP/UDP port numbers and display their standard assigned services and protocols.

Common TCP / UDP Port Reference
Security Warning: Port numbers represent standard service assignments defined by IANA. An open port assignment does not prove what software or service is actually running on that port during live network scans.
Port Protocol Service / Assigned Purpose Security Category
21TCPFTP - File Transfer ProtocolUnencrypted
22TCPSSH / SFTP - Secure ShellEncrypted
25TCPSMTP - Simple Mail Transfer ProtocolMail
53TCP/UDPDNS - Domain Name SystemInfrastructure
80TCPHTTP - Hypertext Transfer ProtocolUnencrypted Web
110TCPPOP3 - Post Office Protocol v3Mail
143TCPIMAP - Internet Message Access ProtocolMail
443TCPHTTPS - HTTP over TLS/SSLSecure Web
3306TCPMySQL / MariaDB Database ServerDatabase
5432TCPPostgreSQL Database ServerDatabase
6379TCPRedis In-Memory Data StoreDatabase
27017TCPMongoDB NoSQL DatabaseDatabase
What is Port Number Reference & Service Lookup?

Port Number Reference & Service Lookup is an online engineering and computational utility designed to provide immediate, high-precision results for students, researchers, and developers.

Formula & Method

Calculations use standard precision formulas and client-side processing:

Port Number Reference & Service Lookup Engine
Where it is Used

Widely utilized in academic coursework, laboratory experimentation, production engineering, electronic circuit prototyping, and web application development.

Practical Worked Example
Sample Scenario:
Given initial input values into the calculator above:
  • Input Parameter 1: Standard test value
  • Input Parameter 2: Design specification
  • Result: Calculated instantaneously without server latency.
Input Guidelines
  1. Enter positive numbers or text strings into the designated input fields.
  2. If invalid values are supplied, the calculator displays a friendly error: "Please enter a valid number."
  3. Use the Copy button to copy calculated outputs directly to your clipboard.
  4. Click Clear / Reset to restore default sample values.
Technical Disclaimer: Results generated by Port Number Reference & Service Lookup are intended for educational, research, and general design estimates. Critical structural, electrical, or medical calculations should be independently verified against official technical datasheets.
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