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(Don't know what this page is about? Have a look at the main page.)

OK, here's the drill: paste a hosts file into the textarea, and hit "convert to BIND zone file format". Then -- and I know this might come as a surprise, but keep with me here -- if you pasted a valid hosts file into the textarea, it will be converted into BIND zone file format, and presented below the textarea. Or, if you prefer, you can upload a hosts file instead. The textarea takes preference though, so if you try uploading both you'll only get results from the stuff from there.

Notes:

• The maximum file upload size is 5 MB, and the maximum amount of data you can put in the textarea is 9 MB, hopefully enough for a hosts file. If your hosts file is bigger than this, have a look through the ODP's File Splitters category for an application that will split it into smaller chunks.
• Each line of your hosts file is assumed to be in this format:

  <ip address> <hostname> [hostname] [hostname] [...]

  Where [hostname]s in square brackets are optional. So, something like this:

  127.0.0.1 example.net example.org
  127.0.0.1 www.example.com
  ... etc...

• Any lines the script doesn't understand are ignored.
• Exact duplicates of hostnames found are removed from the output. Hostnames that are subdomains of other entries are not, however. For a script that does this, check out ObiWan's VB script.
• Hosts are converted to lowercase before output.