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Since organistation has 30 hosts, Class C network with /24 Prefix should be used since it can support 254 hosts.

Now there are 30 hosts, so the minimum number of bits required for host number is 5, since $2^5 - 2$ is 30.

The rest of bits i.e 3 can be used as subnet number.

So the mask is 11111111.11111111.11111111.11100000

For reference have a look at http://andthatsjazz.org/wbglinks/pages/reads/misc/ip.html
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