port-checker performs TCP connect probes against a host you name. Use it on machines and networks you own or have explicit permission to test. Unauthorized scanning can violate the law and the target's acceptable-use policy.

The tool is deliberately narrow:

• TCP connect only (no stealth SYN scan, no UDP, no payloads)
• Specific ports, not a full 1–65535 sweep by default
• Hard cap of 4096 ports per invocation

If you believe there is a security issue in this repository itself (for example, unexpected network behavior, command injection in argument parsing, or a dependency problem if any are added later), please do not open a public issue.

Email the maintainer via the GitHub profile attached to this repository, or open a private security advisory on GitHub.

Include:

• What you ran
• What you expected
• What happened
• Node.js and OS versions

Please give a reasonable window before public disclosure.