Got some hidden Wi-fi networks from the neighbors that you think may be causing interference to your own? Want to find out more about their identity? No worries, it’s actually not that hard, they still broadcast beacon signals and you can receive them from a wireless scan, it’s just that the SSID is not filled in.
Nevertheless, if you really do want the SSID information, you can get it.
20191216/DuckDuckGo linux how to detect hidden wi-fi networks
20191216/http://www.bitforestinfo.com/2017/07/find-hidden-wireless-ssid-using-wireshark-and-kali-linux.html