TCP Connection Tester

Test TCP port connectivity reliably

Host / IP Address

Port

Terminal Commands

Browser security (CORS) prevents direct raw TCP socket connections from web pages. Use these native commands in your terminal to accurately test TCP connectivity.

Windows (PowerShell)

Test-NetConnection -ComputerName example.com -Port 443 -InformationLevel Detailed

macOS / Linux (Netcat)

nc -vz example.com 443

macOS / Linux (Telnet)

telnet example.com 443

cURL (HTTP/S only)

curl -v telnet://example.com:443

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About TCP Connection Tester

Since browsers block raw TCP socket connections for security (CORS), this tool generates the exact native commands you need to test TCP connections on Windows, macOS, and Linux using tools like Netcat, Telnet, PowerShell, or cURL.