Domain name by walls, but set the host files directly refers to the source IP will also be a wall-CodePudding

Everyone a great god, ask a question, I built a web site, through the domain name before access is normal, suddenly one day not be able to access, ping the domain name is parsed to 127.0.0.1, then thought to be the domain name is hijacked, access to the host file set IP parsing directly to my web site, ping normal but also not normal visit, domain name change after can normal visit,

Domain name hijacking is not at the DNS level hijacked, why set up after the host will also be intercepted? (content health does not involve illegal=_=)