Python - Get MAC address of only the connected local NIC [duplicate]

Answer 1

As vartec suggested netifaces should work well to go from IP->iface:

    import netifaces as nif
    def mac_for_ip(ip):
        'Returns a list of MACs for interfaces that have given IP, returns None if not found'
        for i in nif.interfaces():
            addrs = nif.ifaddresses(i)
            try:
                if_mac = addrs[nif.AF_LINK][0]['addr']
                if_ip = addrs[nif.AF_INET][0]['addr']
            except IndexError, KeyError: #ignore ifaces that dont have MAC or IP
                if_mac = if_ip = None
            if if_ip == ip:
                return if_mac
        return None

Testing:

    >>> mac_for_ip('169.254.90.191')
    '2c:41:38:0a:94:8b'