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Assuming there is a given ip address, how to determine if it is in a specific subnet with mask?

(ip & mask == subnet & mask) and (ip & mask == subnet), which is better?

Gray
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    what's the question here? Subnet + mask is better than just the subnet, because without the mask you don't know how big the subnet is .. – CustomX Feb 19 '16 at 15:13
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    I also have no idea who would +1 this question tbh ... – CustomX Feb 19 '16 at 16:01

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