python - Strange result when checking if an ip address is in a network with netaddr -

when run following code in python 2.7 true of these checks.

from netaddr import * testip = '192.168.2.5' testnetwork = '192.168.3.0/23' if testip in ipnetwork(testnetwork):     print "logic fail" if ipaddress(testip) in ipnetwork(testnetwork):     print "logic fail" if testip in ipset([testnetwork]):     print "logic fail" if ipaddress(testip) in ipset([testnetwork]):     print "logic fail" 

output is:

logic fail logic fail logic fail logic fail 

that isn't strange result, cidr specified used called "supernetting", so:

192.168.3.0/23 

effectively covers

192.168.2.1  

through

192.168.3.254 

giving around 512 possible addresses work /23 same network mask

255.255.254.0 

which 3 gets bumped 2

to visualize, can use online subnet calculator http://mxtoolbox.com/subnetcalculator.aspx