Port reference
🔒 Runs locally in your browser. Nothing you enter is uploaded.
How to use it
- Search by port number, protocol or service name.
- Read the security note.
- Use it to review firewall rules and exposure.
Frequently asked questions
Which ports should never face the internet?
SMB (445), RDP (3389) without a gateway, databases (1433, 3306, 5432, 27017), Redis (6379) and OT protocols.
Is port 443 always safe?
It's encrypted transport, not a guarantee. The service behind it still needs patching and hardening.
More free security tools
🔑🎲#️⃣🔁🎫📊
Password strength checker
See how long a password would survive offline cracking, and why.
Password generator
Cryptographically random passwords and memorable passphrases.
SHA-256 hash generator
SHA-1/256/384/512 of text or a file, and compare against a known hash.
Base64 encoder/decoder
Base64, Base64URL, URL, Hex, HTML entities and ROT13, both ways.
JWT decoder
Decode a JSON Web Token and flag risky settings. Decoding is not verifying.
CVSS calculator
Score a vulnerability and get its vector string.