A free app for Android, by Ian Hawkins.

A fast and reliable network scanner app for network admins. It can scan the network in your office and export the scan results as CSV. The exported data can be saved in a file and imported into Excel, Google Spreadsheet, or LibreOffice. You can save the results of the scan as a CSV file and import it into your favorite spreadsheet program. The app can also do MAC address lookups to identify the network’s MAC address.

The app has a very fast interface and can scan a network in your office in less than 30 seconds. The exported CSV file can be saved to a local file.