I'm trying to setup an IP address range. It's asking for:

A) IP Address Range (but it will only accept a normal IP address)

B) Mask or Prefix

I need to allow -

How can I make that happen?

alt text

  • I have the same question, but I don't see a good answer. So how would I be able to block for example the range: What subnet mask do I need to provide?
    – Cerveser
    Dec 17, 2014 at 15:26
  • I suppose that using the IP Subnet Calculator linked in Vivek's answer will get you to an answer. I think an IP address of with subnet mask of will do the trick - assuming that you want to reject traffic from 4.4.4.* Dec 18, 2014 at 16:07

2 Answers 2


You need to specify the IP Address and a proper subnet mask. I just used IP Subnet Calculator to calculate the subnet mask for the address So if you specify the subnet for 14 nodes.

  • 2
    Which incidentally would not solve his problem - alone. He needs 100 to 120 ;) 20 nodes.
    – TomTom
    Mar 15, 2010 at 7:12
  • just play around with the subnet mask.. thats it :) Mar 15, 2010 at 7:38

By entering a lot of individual addresses.

100-120 is not doable in a single masked entry. It just does not align properly with any mask possible.

Be also carefull whether what you do makes any sense. Users with enough rights can change their ip address - so, this is only barefuly usable in limited scenarios within a LAN. I would suggest not filtering by IP address, but using user identities / accounts if possible.


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