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I am sending a mail in java by using mail.jar. In that I am giving a URL to perform some action.

In the URL I am giving the actual IP Address. But I found that giving IP address is not secure.

So I want to generate subnet mask or something like that to secure the IP Address.

So Please help me to generate subnet mask for IP Address in Java.

Thank You

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  • An example of what you have and what you're after would help. Commented Jul 20, 2012 at 10:50
  • I have IP Address 123.456.789.111, so I am expecting something like demo.example.com for my IP Address Commented Jul 20, 2012 at 12:17
  • 123.456.789.111 lol Commented Dec 1, 2017 at 15:03

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You cannot compute the subnet mask from the IP address. You can guess, but that guess may be wrong. I don't see how a subnet mask would “secure” an address in any way, or how an IP address would be less secure than a host name. What kind of security do you have in mind here?

So for the question as it currently reads, the answer is:
That's impossible, but why should you want to do that anyway?

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3 Comments

Thanks MvG for your reply. I mean to secure IP Address in the way instead of giving IP number like '123.456.789.000' we should give like 'demo.example.com'
So it is not a netmask which you are looking for, but a host name instead. The task you try to accomplish here is usually called reverse DNS, and ways to address it in Java have already been discussed here. If there is a specific question you want to ask about reverse DNS, I suggest you do so in a new question, instead of editing this one here, as this is not an interactive chat site here.
Ok sorry I asked it in reverse, bcoz I dont hv much knowledge of Networking. I'll try with your link

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