Sentinel42 is a web directory organized along editorial lines — think of it as a newsroom that files dispatches about the open web rather than breaking news. Each of the 22 specialist desks covers a distinct sector of online activity, from health and medicine to industrial fabrication, and every site in the directory has been assigned to the desk that best fits its subject matter. The directory was built on a straightforward premise: that the web is easier to navigate when it is organized by human editors applying consistent criteria, not by algorithms optimizing for engagement. Sentinel42's correspondents review submissions against a simple standard — does the site exist, does it function, and does it belong in the desk it was submitted to? If yes, it gets filed. The current file spans 835 active listings across the 22 desks. That number reflects the sites that have passed review, not the total volume of submissions received. Sentinel42 maintains a clean file rather than an exhaustive one: dormant sites are removed when discovered, and duplicate submissions are rejected at the desk level. Operators wanting to submit a site can use the Add a Site form available from the directory's main navigation. Submission is free. There is no guarantee of inclusion, and the decision of which desk a site is assigned to rests with Sentinel42's editorial team. Sites that straddle multiple categories are assigned to the desk that best fits their primary function, or placed in the General Assignment Desk if no specialist desk applies. Sentinel42 does not sell placement, sponsored listings, or preferential positioning. Every site in the file was admitted through the same review process, and rankings within each desk reflect submission order rather than commercial arrangement.