how to perform AND operation on ip address and subnet mask in python

Question

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How can I check if an ip is in a network in python

I have one destination ip address from a file suppose ip1 = 172.16.0.34; and I have one more file having (subnet, mask, next-hop) i.e 172.16.0.0, 255.255.255.0, 117.120.10.1

I have to check whether the incoming address ip1 matches the subnet entry for a particular route,after being ANDed with the netmask of that entry in the routing table. If the destination matches under mask,add the route to the list of feasible routes for this packet

Something tells me this is homework, and your post was copy-pasted from the pdf handout — inspectorG4dget, Feb 01 '13 at 05:13

score 0 · Answer 1 · answered Feb 01 '13 at 05:56

0

I'm assuming their strings to begin with:

ipadd = '192.168.1.1'
mask = '255.255.0.0'
anded = list()
for ip, m in zip(ipadd.split('.'),mask.split('.')):
   anded.append(str(int(ip) & int(m)))
subnet = '.'.join(anded)

answered Feb 01 '13 at 05:56

Stephen

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I tried this but it's throwing an error:ValueError: invalid literal for int() with base 10: '' – user2017241 Feb 02 '13 at 00:20

score 0 · Answer 2 · answered Feb 01 '13 at 06:00

0

Try putting them in a Array then compare ! it's just my suggestion ...

answered Feb 01 '13 at 06:00

F25rT

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how to perform AND operation on ip address and subnet mask in python

2 Answers2