$ ping -c1 -p 00a9c1dd6d4a7d52b2783f73aceb0f00 unhack.ca
 
$ curl http://unhack.ca/p/a9c1dd6d4a7d52b2783f73aceb0f
 
$ dig a9c1dd6d4a7d52b2783f73aceb0f @unhack.ca
 
$ dig a9c1dd6d4a7d52b2783f73aceb0f.ns.unhack.ca
 
C:\> nslookup a9c1dd6d4a7d52b2783f73aceb0f unhack.ca
 
C:\> type \\unhack.ca\a9c1dd6d4a7d52b2783f73aceb0f\f.txt
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/a9c1dd6d4a7d52b2783f73aceb0f">]>
    <foo>&xxe;</foo>
 
Waiting for ping...