#!/usr/bin/env python
import subprocess
import re
import sys

def arping(ipaddress="10.0.1.1"):
    """Arping function takes IP Address or Network, returns nested mac/ip list"""

    #Assuming use of arping on Red Hat Linux
    p = subprocess.Popen("/usr/sbin/arping -c 2 %s" % ipaddress, shell=True,
                        stdout=subprocess.PIPE)
    out = p.stdout.read()
    result = out.split()
    #pattern = re.compile(":")
    for item in result:
        if ':' in item:
            print item

if __name__ == '__main__':
    if len(sys.argv) > 1:
        for ip in sys.argv[1:]:
            print "arping", ip
            arping(ip)
    else:
        arping()