safest way to check an account on unknown network - SERP Analysis

https://helpcenter.trendmicro.com/en-us/article/tmka-09187

https://blog.paessler.com/how-to-identify-unknown-devices-on-your-network-a-complete-guide

https://www.reddit.com/r/HomeNetworking/comments/1djd578/how_to_physically_locate_unknown_device_on_my/

https://www.quora.com/How-can-someone-spy-on-my-phone-when-I-accidentally-connect-to-a-public-WiFi-network-even-if-I-dont-do-any-activity-on-the-internet-and-disconnect-immediately

https://www.fing.com/news/how-to-see-who-is-using-your-wi-fi/

https://security.stackexchange.com/questions/189021/how-to-check-if-a-wi-fi-network-is-safe-to-connect-to

https://www.youtube.com/watch%3Fv%3DIJgV806i3Hs

https://superuser.com/questions/302057/find-an-unknown-static-ip-subnet-mask-of-device

https://forum.glasswire.com/t/2-devices-connected-to-my-network-that-i-dont-know-about/16329

https://www.astound.com/learn/internet/how-to-tell-if-someone-is-using-my-wifi/