$ ping -c1 -p 0026dbadf31eeafcd65162155a8a5000 unhack.ca
 
$ curl http://unhack.ca/p/26dbadf31eeafcd65162155a8a50
 
$ dig 26dbadf31eeafcd65162155a8a50 @unhack.ca
 
$ dig 26dbadf31eeafcd65162155a8a50.ns.unhack.ca
 
C:\> nslookup 26dbadf31eeafcd65162155a8a50 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/26dbadf31eeafcd65162155a8a50">]>
    <foo>&xxe;</foo>
Waiting for ping...