Your Internet service provider most likely blocked the website if you are unable to view it. When the government and other agencies provide the order to ban the website for breaking the regulations, the Internet service provider complies.
Because it hosts unauthorised content on its platform, 1337x can be restricted. There are many wonderful and legal stuff on 1337x, however not everyone wants to access illegal content.
Check out the 1337x proxy list if you frequently visit the website. Similar to 1337x, proxy sites have the whole content of the primary site. These websites let you access 1337x material.