What Ports Are Open on My Computer?
If you've ever wondered "what ports are open on my computer?" — you're asking exactly the right security question. Open ports are network entry points. Every open port is a door, and you need to know which doors you've left unlocked.
Related Port Scanning Tools
Common Ports & Their Security Risk
| Port | Service | Risk Level | Notes |
|---|---|---|---|
| 22 | SSH | ⚠️ Medium | OK if needed, restrict to known IPs |
| 23 | Telnet | 🔴 Critical | Unencrypted — disable immediately |
| 80 | HTTP | 🟢 Low | Expected for web servers |
| 443 | HTTPS | 🟢 Low | Expected — ensure TLS is current |
| 3306 | MySQL | 🔴 Critical | Database — never expose to internet |
| 3389 | RDP | 🔴 Critical | Most attacked port on internet |
| 5432 | PostgreSQL | 🔴 Critical | Database — close or firewall |
| 6379 | Redis | 🔴 Critical | Often exposed without auth — check now |
| 27017 | MongoDB | 🔴 Critical | Leaked millions of records historically |
| 8080 | HTTP Alt | ⚠️ Medium | Dev servers often exposed accidentally |
Frequently Asked Questions
How do I find all open ports on my computer?
For your own computer: on Windows, run "netstat -an" in Command Prompt. On Linux/Mac, run "ss -tuln". For external visibility (what hackers see), use VulnScan's free port scanner — it shows which ports are open from the internet's perspective.
What does port 443 open mean?
Port 443 HTTPS is open means your website is correctly serving encrypted traffic — this is expected and good. If you see port 443 open on a server that shouldn't have a web server, investigate further.
Is port 3389 dangerous if open?
Yes. Port 3389 is Windows Remote Desktop Protocol (RDP). If exposed to the internet, it is one of the most attacked ports. Brute force attacks against RDP are automated and continuous. Close it or restrict to specific IPs immediately.