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    <p>The easiest way to to this in my experience is to use two third party packages:</p> <ul> <li><a href="http://pypi.python.org/pypi/netifaces/" rel="noreferrer">python-netifaces</a>: Portable network interface information</li> <li><a href="http://pypi.python.org/pypi/netaddr" rel="noreferrer">python-netaddr</a>: Pythonic manipulation of IPv4, IPv6, CIDR, EUI and MAC network addresses</li> </ul> <p>So install those modules and then it's as easy as this:</p> <pre><code>import netifaces import netaddr import socket from pprint import pformat ifaces = netifaces.interfaces() # =&gt; ['lo', 'eth0', 'eth1'] myiface = 'eth0' addrs = netifaces.ifaddresses(myiface) # {2: [{'addr': '192.168.1.150', # 'broadcast': '192.168.1.255', # 'netmask': '255.255.255.0'}], # 10: [{'addr': 'fe80::21a:4bff:fe54:a246%eth0', # 'netmask': 'ffff:ffff:ffff:ffff::'}], # 17: [{'addr': '00:1a:4b:54:a2:46', 'broadcast': 'ff:ff:ff:ff:ff:ff'}]} # Get ipv4 stuff ipinfo = addrs[socket.AF_INET][0] address = ipinfo['addr'] netmask = ipinfo['netmask'] # Create ip object and get cidr = netaddr.IPNetwork('%s/%s' % (address, netmask)) # =&gt; IPNetwork('192.168.1.150/24') network = cidr.network # =&gt; IPAddress('192.168.1.0') print 'Network info for %s:' % myiface print '--' print 'address:', address print 'netmask:', netmask print ' cidr:', cidr print 'network:', network </code></pre> <p>And this outputs:</p> <pre><code>Network info for eth0: -- address: 192.168.1.150 netmask: 255.255.255.0 cidr: 192.168.1.150/24 network: 192.168.1.0 </code></pre> <p>This was done using Linux. With OSX the interface names are different but the method is the same.</p>
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    1. COThis is erroring out on 'ipinfo = addrs[socket.AF_INET][0]' am I doing something wrong?
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    2. COPossibly. What is the error? Did you remember to `import socket`?
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