Python IP Check

Question

Given the range xxx.xxx.xxx.(195-223) Is that correct to write it in xxx.xxx.xxx.196/29 and check whether an IP is in the given network by doing

from ipaddr import IP, CIDR 
#if IP('xxx.xxx.xxx.xxx') in IP('xxx.xxx.xxx.196/29') or
#if IP('xxx.xxx.xxx.xxx') in CIDR('xxx.xxx.xxx.196/29')

Answer 1

I didn't see IP in ipaddr, only IPAddress. May be like this?

from ipaddr import IPAdddress, IPNetwork
if IPAddress('10.0.0.195') in IPNetwork('10.0.0.196/29'):
 pass

• user1076881: I tried to look for ipaddr doc packages.python.org/ipaddr can't seem to find usage of IPAddress/IPNetwork, or is it the wrong one what I was looking at..
• Valentin Briukhanov: I just using easy_install ipaddr and looking help(ipaddr).
• user1076881: That would validate IP in the range of 10.0.0.193 to 10.0.0.198?
• user1076881: If I would like to validate IP in the range of 10.0.0.195 to 10.0.0.200 for example, do I really have to convert it to CIDR beforehand?
• Valentin Briukhanov: Also you can use construction like IPAddress('10.0.0.194') < IPAddress(my_ip_string) < IPAddress('10.0.0.200')

Answer 2

I haven't used the ipaddr module, but note that /29 means that your network mask is 255.255.255.248 and that you only have the latest 3 bits to address 2^3 = 8 different hosts in your network ranging from xxx.xxx.xxx.248 to xxx.xxx.xxx.255. That's outside of the range you want to check.

For more information, please have a look at the subnetwork wikipedia page.