There is no "site" This is a domain owned and controlled by DynDNS. It's purpose is to act as a redirection service for free / hosted domain names through the DynDNS service. You can obtain a domain such as: Your_Name.ath.cx where you can set up your Linux or Windows web server from home and connect to the Net.
You may find negative comments stating "Malicious content" or "Adult content" that may very well be true for the domain that is hosted, but it would be a SUBDOMAIN which is a site of it's own and has nothing to do with this domain. Any comments referencing a blacklist such as: DNS-BH or MDL... they are FP's and should be removed from those lists and not used as "reference" for ratings. This doamin is "safer" than visiting google.com (comparing SafeBrowsing diagnostics pages).
atc.cx is one of the Dynamic DNS hostnames availaible from DynDNS.com Services.
source : http://www.dyndns.com/services/dns/dyndns/domains.html
I don't know why some source saying that it is spam/malicious contents/viruses site, possibly because due it's open to public and it's one of the free dns available, some people register and having *.ath.cx, and makes a bad site on it.
While usually I founds that the domains inherit it's reputation from it's sub-domain - and vice-versa - it got that bad reputation from some of it's bad sub-domain.
That's just may opinion tough, I'm not really know how those rating system works.
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