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

Question

When I run the following code in Python 2.7 I get true for all 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

Answer 1

That isn't a strange result, the CIDR you specified is what used to be called "supernetting", so:

192.168.3.0/23

Effectively covers

192.168.2.1 

through

192.168.3.254

giving you around 512 possible addresses to work with /23 is the same as this network mask

255.255.254.0

which is where the 3 gets bumped back to 2

To help visualize, you can use an online subnet calculator like http://mxtoolbox.com/subnetcalculator.aspx

Answer 2

For 192.168.3.0/23 network the range is:

192.168.2.1 - 192.168.3.254

so your IP address 192.168.2.5 falls into this range. Not sure what you're trying to achieve, but given what's specified python code works as expected