How can I report 1-ug555.site if it's malicious or illegal?

You can report a suspicious site like 1-ug555.site to several places, depending on the nature of the problem: 1) Your web browser (e.g., Chrome, Firefox). 2) Your Internet Service Provider (ISP). 3) The hosting provider if you can find it. 4) Law enforcement agencies, especially if you suspect criminal activity. 5) The relevant authorities related to the content on the site (e.g., if it's spreading malware, or scams.)