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Editorial Team
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Asked: 2026-06-17T07:41:53+00:00

In my Python script I need to retrieve both the IP address of the

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In my Python script I need to retrieve both the IP address of the machine the script is running on and its network address and its network bytes.

As for the IP address, I found the solution in the archive:

import socket
s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
s.connect(("www.google.com",80))
myAddress = (s.getsockname()[0])
s.close()

But how should I go about finding network address and network bytes? I need to put this information into a filter for tcpdump in the format $NetworkAddress/$NetworkBytes, if that helps at all.

Example:

128.1.2.0/20

I can actually find it under inet when I run ip addr. Any easy way to get this information in Python?

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1 Answer

  1. Editorial Team

    For Linux try

    iface = "eth0"
socket.inet_ntoa(fcntl.ioctl(socket.socket(socket.AF_INET, socket.SOCK_DGRAM), 
                             35099, struct.pack('256s', iface))[20:24])

    or http://github.com/rlisagor/pynetlinux

    (as suggested here: Retrieving network mask in Python)

    For Linux, Windows and MacOS consider http://alastairs-place.net/projects/netifaces/

    Update:

    If you need cidr (like ‘128.1.2.0/20’), you can use any of the related libs: http://pypi.python.org/pypi?%3Aaction=search&term=cidr&submit=search

    For example netaddr:

    >> from netaddr import IPNetwork
>> print str(IPNetwork('1.2.3.4/255.255.255.0').cidr)
1.2.3.0/24
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