Right now, I’m getting 404 not found, not getting redirected nor a 400
But a quick search of 88.255.216.16 shows that it’s a page from your ISP that you get redirected to if the website is blocked. Can you access kesug.com itself?
The only things you can do is either contact your ISP, or use a vpn.
I checked that IP address you posted (88.255.216.16) and it appears to be linked to the internet service provider Turk Telekomunikasyon Anonim Sirketi. The only reason that an ISP would redirect you to such page is if its government had, for some reason, blocked the domain or all 185.x.x.x IP addresses.
The only real fix? Either contact your ISP, switch ISPs (won’t work if the 185.x.x.x IP range belonging to iFastNet is blocked) or start using a VPN.
I mostly agree with what @Fyhrer said. But I’m not sure if it’s an IP address level block, or a DNS level block, possibly targeted at the kesug.com domain. And I’m honestly leaning toward the latter.
Could you try configuring your device to use a different DNS resolver, which doesn’t block websites? Like Clouflare’s 1.1.1.1 service? That may let you bypass this block.
But what’s clear is that your ISP is blocking your access to your website. And since they are the ones who have setup this block, only they can lift it. So please contact them about this issue, because there is nothing we can do from our end.