title: RARP using Python standard libraries
body: <p>I have a few webcams whose MAC IDs are known. I need a way to determine the corresponding IP addresses. Assume everything is on the same wifi network. I, however, do not have privilege to modify the wifi network router settings (in other words, I cannot assign static IPs to the cams).</p>
  
  <p>I have heard of Reverse-ARP protocol which can help identify the IP address given the MAC ID. <a href="https://pypi.python.org/pypi/arp" rel="nofollow">There is</a> a library available for ARP/RARP but I was wondering if this could be done without installing an external library. </p>