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Possible Duplicate:
How does Subnetting Work?

So if I add 62.234.231.65/32 to my allowed IPs in security groups, does that mean that everyone with an IP from 62.234.231.0 to 62.234.231.255 can access the instance?

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If you mean the well-known IP/subnet notation, then this specifies a single IP address because of the subnet mask /32. If you want to have the range from 0 to 255 in the last octet, you need to specify /24 as subnet mask.

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