Dmitry Dmitry - 2 years ago 124
Java Question

Converting CIDR address to subnet mask and network address

Given a CIDR address, e.g.

  • How to determine mask length? (

  • How to determine mask address? (

  • How to determine network address? (

Answer Source

It is covered by apache utils.

See this URL:

String subnet = "";
SubnetUtils utils = new SubnetUtils(subnet);


Note: For use w/ /32 CIDR subnets, for exemple, one needs to add the following declaration :

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