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Asked: 2026-05-11T09:27:58+00:00

I need to determine if given IP address is from some special network in

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I need to determine if given IP address is from some special network in order to authenticate automatically.

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  1. Apache Commons Net has org.apache.commons.net.util.SubnetUtils that appears to satisfy your needs. It looks like you do something like this:

    SubnetInfo subnet = (new SubnetUtils('10.10.10.0', '255.255.255.128')).getInfo(); boolean test = subnet.isInRange('10.10.10.10');

    Note, as carson points out, that Apache Commons Net has a bug that prevents it from giving the correct answer in some cases. Carson suggests using the SVN version to avoid this bug.

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