Port Scanner
Scan common ports on a host
About Port Scanner
This tool scans common ports to check which services are running. Open ports accept connections, closed ports reject them, and filtered ports are behind a firewall.
Scan for open ports on any server or IP address. Check whether common ports (HTTP 80, HTTPS 443, SSH 22, FTP 21, etc.) are open, closed, or filtered. Useful for verifying firewall rules, checking service availability, and basic security auditing of your own servers.
Key Features
- ✓Scan common ports or custom port ranges
- ✓Open, closed, and filtered status detection
- ✓Service name identification per port
- ✓Quick scan (top 20 ports) and custom scan modes
- ✓Timeout configuration
How to Online Port Scanner
- 1
Enter host
Type an IP address or domain name to scan.
- 2
Select ports
Choose common ports, a custom range, or specific ports.
- 3
View results
See which ports are open, closed, or filtered.
Common Use Cases
- •Verifying firewall rules after configuration changes
- •Checking if a web server is listening on ports 80 and 443
- •Confirming SSH access is available on port 22
- •Basic security audit of exposed services on your servers
Frequently Asked Questions
Is it legal to scan ports?▼
Scanning your own servers is legal. Scanning others' servers without permission may violate laws and terms of service. Always have authorization before scanning.
What does "filtered" mean?▼
A filtered port means a firewall is blocking the connection attempt — the port didn't respond as open or closed. This is common when firewalls silently drop packets.