The WifiManager.startScan() usage is limited to: - Each foreground app is restricted to 4 scans every 2 minutes. - All background apps combined are restricted to one scan every 30 minutes."

Mark startScan() as deprecated so that we can take away this API in future releases. https://android.googlesource.com/platform/frameworks/base/+/...

239,989,522 wifi networks: https://wigle.net

A problem with wigle (and maybe others) it it's showing every portable mobile wifi hotspot which are extremely common in Japan. If you're trying to find all the places someone who owns that hotspot has been maybe that's useful info but usually it's not that useful. Zoomed in to the maximum level there's so many SSIDs it's unreadable.

You can use a different dummy subdomain as the first entry to issue another cert, adding the subdomains you really want as secondaries. See https://kuix.de/blog/index.php?entry=entry140827-231120