Military Mode S Code Lookup

#1
I don't know if anyone else has used it before, but I have been using a link that I found somewhere to check out military flights in my area in the US East Coast. The link is http://ekkert.org/is/links/modelook/ but of late I have been getting a Page 404 error when I try to go to it. This worked, until about a week ago. Has anyone else ever used this site, and if so, are you having the same problem?