What can the internet reach in your office?
Bots scan every address on the internet for open Remote Desktop, file shares and databases, and ransomware gangs use what they find. This connects from the internet back to the network you're on and tries the 14 services they look for most.
Scans the network this device is on right now. Run it from the office you want to check, not from home or mobile data.
It scans the network you're on
The scan only ever connects to the public address this page was loaded from, so you can only scan your own connection. Run it from each office, not from home or over mobile data. On a VPN, it scans the VPN's exit instead.
Limits
TCP only, one address, a fixed list of ports, and port 25 (email) can't be tested. It finds common exposures attackers look for; it isn't a full vulnerability scan. Your address and the results aren't stored or logged. To test one port you choose, use the open port checker.