cdn3 is one edge node of the small NeoDim content network. Public requests arrive at the front gateway in Moscow and are forwarded to this box, which keeps a local copy of the operator's static files. An object this node has seen recently is answered straight from the edge cache; otherwise the node fetches it from the origin and stores the result. Everything is served with standard cache validators, so revalidations are cheap for both sides.
The node is deliberately plain: no tracking scripts, no third-party fonts, no account system, no redirects behind the first hop. Purges and origin changes are done by the operator; diagnostics are available on request at postmaster@neodim.tech.