IP Range Calculator
CIDR, subnet mask and usable address range
Network
Broadcast
Subnet mask
Wildcard
First usable
Last usable
usable hosts of total
IP Range Calculator — Complete Guide & Instructions
MakeCard IP Range Calculator expands any IPv4 CIDR block into its full anatomy. Enter 192.168.1.0/24, or an IP plus dotted mask like 10.0.0.0 255.255.0.0, and get the network address, broadcast, subnet and wildcard masks, first and last usable host addresses, and total-vs-usable host counts — with the canonical CIDR confirmed in a badge. Both /32 single hosts and /31 point-to-point links are handled correctly.
How to Use IP Range Calculator
- 1 Type the network as CIDR (192.168.1.0/24) or IP + mask (10.0.0.0 255.255.0.0) in the Network field.
- 2 Press “Calculate” or hit Enter.
- 3 Read the six stat cards — network, broadcast, subnet mask, wildcard, first and last usable.
- 4 Check the summary line: usable hosts out of total addresses, plus the canonical CIDR badge.
- 5 Adjust the prefix to compare subnet sizes side by side.
Key Features & Capabilities
- Accepts both CIDR notation and IP + dotted decimal mask input.
- Outputs network, broadcast, subnet mask, wildcard mask, first and last usable IP.
- Usable vs total host counts — handles /31 and /32 edge cases correctly.
- Non-contiguous mask validation catches dotted-mask typos.
- Canonical CIDR output regardless of which host address you entered.
- Indian-style digit grouping on large host counts (e.g. 16,777,214 for /8).
Supported Formats & Specifications
| Parameter | Specification |
|---|---|
| Input | IPv4 CIDR (a.b.c.d/n) or IPv4 + dotted mask |
| Prefix range | /0 to /32 |
| Outputs | Network, broadcast, mask, wildcard, first/last usable, host counts |
| Edge cases | /31 point-to-point and /32 host routes supported |
| Processing | Instant, in-browser |
Practical Everyday Use Cases
- Designing VLAN subnets and documenting usable ranges.
- Checking how many hosts a /26 or /27 actually supports before carving up a LAN.
- Converting a dotted subnet mask to CIDR for router configs.
- Verifying firewall rules written in CIDR notation.
- Studying for CCNA/Network+ subnetting questions.
Pro Tips for Best Results
- Usable hosts is total minus 2 (network + broadcast) — except /31 and /32, which this tool reports correctly.
- Wildcard mask = inverted subnet mask — used by Cisco ACLs and OSPF network statements.
- Enter any address in the block, not just the network address — the canonical network is computed for you.
- A /24 gives 254 usable hosts; each smaller prefix number doubles the space.
Common Problems & Solutions
The mask must be contiguous (255.255.255.0 is fine; 255.0.255.0 is not) — check for a typo in the dotted mask.
Two addresses are reserved per subnet — network and broadcast; only /31 and /32 escape this rule, which the tool applies.
Privacy & Security
100% Client-Side Execution
All subnet maths runs in your browser — no addresses or ranges are sent anywhere.
Frequently Asked Questions
Everything you need to know about using IP Range Calculator
It is CIDR notation for a 24-bit network prefix — equivalent to subnet mask 255.255.255.0, giving 256 addresses of which 254 are usable.
254 — 256 total minus the network and broadcast addresses; the calculator shows usable and total side by side.
The bitwise inverse of the subnet mask — a /24 has wildcard 0.0.0.255, used in Cisco ACLs and OSPF configuration.
Yes — type 10.0.0.0 255.255.0.0 and the tool converts it to the equivalent /16 automatically.
This calculator is IPv4-only — use the IPv6 reference tool for v6 subnetting rules.
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