Title: Check Open Ports
Description: Check a device you own or are authorized to test for responding network ports.
URL: /v2.1/wifi/port-scanning/
Version: v2.1
Section: Wi-Fi
Search index: /search-index.json

# Check Open Ports

> Check a device you own or are authorized to test for responding network ports.

## On this page

- [What this does](#what-this-does)
- [Before you start](#before-you-start)
- [On-device steps](#on-device-steps)
- [CLI steps](#cli-steps)
- [Expected result](#expected-result)
- [Troubleshooting](#troubleshooting)
- [Related tasks](#related-tasks)

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## What this does
Port scanning checks which network ports on an authorized device respond to connection attempts. Use it to inventory services on your own network.
## Before you start
- Connect GhostESP to the same network as the device.
- Identify the device with [LAN discovery](/v2.1/wifi/lan-discovery/).
- Only scan devices you own or have explicit permission to test.
## On-device steps
- Select a discovered device with Select LAN.
- Choose Scan Open Ports.
- Review the responding ports.
## CLI steps
- Run scanports <ip> to check a specific device.
- Add all to check all ports, or a range such as 20-1024 to limit the scan.
- Run scanssh <ip> to check whether SSH responds on the device.
## Expected result
GhostESP lists ports that respond. A missing result does not prove that a service is absent; firewalls and network policy can block scans.
## Troubleshooting
- No ports respond: Confirm the IP address, network connection, and whether the device has a firewall.
- The wrong device is scanned: Run LAN discovery again and verify the IP address before retrying.
- The scan is slow: Limit the port range to the services you need to inspect.
## Related tasks
- [Find devices on your Wi-Fi network](/v2.1/wifi/lan-discovery/)
- [Connect to a Wi-Fi network](/v2.1/wifi/connect/)