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  • If you connect to a hotspot you control, e.g. an OpenWRT router, you can see a lot of this. Short version: mostly just stuff immediately related to networking, like what you mentioned. However, once you are connected, the hotspot or anything else on the network could do other things to find data about you, like an nmap scan. Commented Nov 16, 2015 at 17:22
  • Is there any kind of guide for this, or do you have some terms that I can use to google? I have a hard time finding any information about this. The best I could find was a guide that told me to always use HTTPS and if possible VPN if using public wifi. Commented Nov 16, 2015 at 17:26
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    VPN in public wifis is a must, otherwise besides listening to non-encrypted communications, even your DNS can be manipulated. Commented Nov 16, 2015 at 17:28
  • If I understand it correctly maybe I worry too much and it's not possible for the WiFi router to gain any information about my hardware or OS version as long as my browser or other tools don't give that information via HTTP meta data. Commented Nov 16, 2015 at 17:32
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    Your MAC gives information about your hardware for starters, and the OS v can be found through TCP/IP stack fingerprinting. Commented Nov 16, 2015 at 17:35