initial commit

cidr-subnets.py

@@ -0,0 +1,37 @@
+#!/usr/bin/env python3
+#
+
+import os
+import sys
+from ipaddress import ip_network
+
+def main(argv):
+    """
+    """
+    if not (len(argv) >= 2 and len(argv) <= 3):
+        print('Usage: %s cidr-block [additional-subnet-split]' % argv[0])
+        sys.exit(1)
+
+    network = argv[1]
+    ip, netmask = network.split('/')
+    octets = ip.split('.')
+    while len(octets) < 4:
+        # add 0's to fill it out
+        octets += ['0']
+    # put the ip back together
+    ip = '.'.join(octets)
+    # put the network back together
+    network = ip + '/' + netmask
+
+    net = ip_network(network, strict=False)
+    subnet_split = 0
+    if len(argv) == 3:
+        subnet_split = int(argv[2])
+    subnets = list(net.subnets(subnet_split))
+
+    for subnet in subnets:
+        print ("net %s : broadcast %s : hosts %s" % (subnet.exploded, subnet.broadcast_address, subnet.num_addresses))
+    print("%s subnets" % int(len(subnets)))
+
+if __name__ == '__main__':
+    main (sys.argv)