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IP Calculator

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Calculate subnets, masks, address ranges and broadcast from CIDR notation.

IP subnet calculator (CIDR)

Enter an IP address and mask (CIDR prefix from /0 to /32) — the calculator instantly computes the network address, broadcast, dotted-decimal mask, wildcard, usable host range and host count. All calculations run in your browser, with no server requests.

The tool is indispensable for sysadmins and anyone configuring networks: split a range into subnets, count addresses for an office, correctly write firewall rules or routing. No more powers of two in your head — the subnet calculator does it without mistakes.

FAQ

What are CIDR and subnet mask?
CIDR (e.g. /24) is a short mask form defining how many address bits are for the network. /24 = 255.255.255.0 and gives 254 hosts.
How to find the number of hosts?
Formula: 2^(32 − mask) − 2. For /24 that is 2^8 − 2 = 254 addresses (two subtracted for network and broadcast).
What is a broadcast address?
It is the last address of a subnet to which messages are sent to all network devices at once. It is not used for hosts.
Why use an IP calculator?
To plan networks, configure routers and firewalls, split a range into subnets without calculation errors.
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