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Failed to create subnet "10.0.100.0/24" for network: The allocation pool {u'start': u'10.0.100.0', u'end': u'10.0.100.255'} spans beyond the subnet cidr 10.0.100.0/24.

I am trying to create a private network in openstack I continue to get this error message

I have ran my subnet through an online utility to verify my calculations are correct and everything checks out.

With 10.0.100.0/24 on a 255.255.255.0 mask I should be able to use the IP pool of: 10.0.100.0 - 10.0.100.255 which is a total of 256 hosts also confirmed via the calculator above. So I am slightly perplexed as to why I am seeing this error