Archive for March 25th, 2009

Checking if an IP is in a subnet range. SubnetUtils.SubnetInfo isInRange bug.

1 Comment Published March 25th, 2009 in Java

Today I used commons-net to verify when an IP address is in a subnet specified in CIDR notation. So, I got a bug. This code: SubnetUtils utils = new SubnetUtils("77.24.0.0/16"); System.out.println("lower address: " + utils.getInfo().getLowAddress()); System.out.println("higher address: " + utils.getInfo().getHighAddress()); System.out.println("77.23.255.254 is in range? :" + utils.getInfo().isInRange( "77.23.255.254" )); gives this output: lower address: 77.24.0.1 [...]

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