All devices on my network redirect me to an old domain

I have moved my website from wordpress.com to a wordpress.org platform. I ordered a new host, meanwhile keeping the old domain. It have been a day since the dns servers were updated and according to my host provider everything is good. The problem I'm facing is that absolutely every device on my network, including mobiles connected trough wi-fi, keeps seeing the older domain when trying to access the website. Everybody else are managing to enter the new domain with the new theme,posts and etc. I tried flushing the dns, cleared every browser cache but still nothing is changed.