How to unblock sites?

Question

Computer networks

Hello!
There is a problem - some sites do not open, for example github.com and the like. Using a proxy - everything works. Nothing opens on the phone either (the Internet distributes one wifi router). The interesting thing is that if you connect an ethernet cable directly to your computer, everything works. I dug into the DNS settings, it did not help. Basically, I don't know who to turn to. Router - TP-link 1043.

Answer 1

traceroute github.com
nslookup github.com
to the studio
As well as ifconfig devices in LAN, there are suspicions that you have a grid of 192.0.0.0/8