IPv4 network calculator

Subnet boundaries, address ranges, IP arithmetic, and route planning.

Total addresses256

Counted addresses256

Prefix/24

Address boundaries

192.168.10.0/24

Network192.168.10.0

Broadcast192.168.10.255

First address192.168.10.0

Last address192.168.10.255

First counted192.168.10.0

Last counted192.168.10.255

Subnet mask255.255.255.0

Wildcard0.0.0.255

Bit allocation

32 bits

11000000.10101000.00001010.00101010

NetworkHost

IP ranges

Starting IP / prefix, one per line The entered IP is the exact range start; the prefix determines its address count.

Ranges are sorted by starting IP before distribution. A route may contain addresses from more than one range.

Route settings

EC2 instance

Egress route width

IPs

Maximum capacity per route.

Minimum routes

routes

Applied only when the natural route count is lower.

Interleave across routesRotate consecutive IPs across the calculated routes. Tight packingFill earlier routes to capacity and leave only the final route partial. Uncheck to balance route sizes evenly. ENI viewShow each route as EC2 network interfaces with up to 30 EIPs on ENI_1 through ENI_7. ENI_0 is reserved for management. Use prefixesSwitch to 3,248 IPs per EC2: 7 ENIs × 29 private /28 blocks × 16 IPs. Uncheck to restore the previous width. Show all ENIsAlways display ENI_1 through ENI_7, including interfaces with no assigned EIPs.

Total addresses128

Egress route width32

Actual egress width32

Routes4

Mixed routes4

Sorted IP ranges

4 ranges · ascending

Input range	First IP	Last IP	Total IPs

Allocation matrix

4 of 4 routes

IPv4 network calculator

Address boundaries

Bit allocation

Exact CIDR decomposition

Distance between addresses

Sorted IP ranges

Allocation matrix

Packing explanation

Allocation cycle

Final capacity

Route map 128 IPs