Free Online Port Range Scanner
Scan up to 1,000 TCP ports on any IP address or domain — tested from an external server, no software required.
How the Port Scanner Works
Enter Target
Input an IP address (IPv4) or domain name you want to scan.
Define Range
Specify the start and end ports. We recommend scanning smaller ranges (e.g., 1-1000) for faster results.
Analyze Results
View the status of each port. 'Open' means a service is listening. 'Closed' or 'Filtered' means the port is not accessible.
Understanding Your Scan Results
| Status | Meaning |
|---|---|
| ● Open | A service is actively listening on this port and is reachable from the internet. |
| ● Closed | The host is reachable but no service is listening on this port. |
| ● Filtered | A firewall is silently dropping packets — no response received. |
| ● Timeout | The target did not respond within the timeout window. |
What Is Port Range Scanning?
Port range scanning tests which ports on a remote host are accessible from the outside internet. Unlike running nmap locally — which tests connectivity from your own machine and may bypass NAT and router rules — this scanner connects from an external server. Results reflect exactly what an outside visitor, game player, or attacker would see when attempting to reach your service.
When to Run a Port Range Scan
Run a port range scan when you need to verify your server setup from an external perspective:
| Scenario | Ports to check |
|---|---|
| Minecraft or game server | 25565 (Minecraft), 30120 (FiveM), 27015 (Steam) |
| Web server or API | 80 (HTTP), 443 (HTTPS), 8080 (dev) |
| Remote desktop (RDP) | 3389 (RDP), 5900 (VNC) |
| VPS security audit | 1–1024 (well-known services) |
| SSH server access | 22 (SSH), 2222 (custom SSH) |
Security Tips for Open Ports
If you find unexpected open ports, close them in your firewall or router immediately. Browse the Port Information Database for risk guidance on specific port numbers.
Browse the Port Information Database →TCP vs UDP — What This Means for Your Scan
This scanner exclusively tests TCP ports using a full connection attempt from our servers. Services running over UDP — including DNS (port 53), VoIP/SIP (port 5060), and Minecraft Bedrock (port 19132) — cannot be reliably verified by external online scanners. For UDP coverage, run nmap locally using the -sU flag.
Scanner Limitations
| Feature | Supported |
|---|---|
| TCP port scanning | ✓ Yes |
| UDP port scanning | ✗ No |
| Private / LAN IP addresses | ✗ No |
| IPv6 addresses | ✗ No |
| Banner / service detection | ✗ No |