$ ping -c1 -p 003fba2490ca9f5c82aa8596bd02c300 unhack.ca
 
$ curl http://unhack.ca/p/3fba2490ca9f5c82aa8596bd02c3
 
$ dig 3fba2490ca9f5c82aa8596bd02c3 @unhack.ca
 
$ dig 3fba2490ca9f5c82aa8596bd02c3.ns.unhack.ca
 
C:\> nslookup 3fba2490ca9f5c82aa8596bd02c3 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/3fba2490ca9f5c82aa8596bd02c3">]>
    <foo>&xxe;</foo>
Waiting for ping...