What notation does it accept?

Standard CIDR notation like 192.168.1.0/24 for IPv4 or 2001:db8::/64 for IPv6. A bare IP defaults to a /32 (IPv4) or /128 (IPv6).

Does it support IPv6?

Yes. IPv6 subnets are fully supported, including the network prefix and address range calculation.

Are calculations done locally?

Yes. The tool uses ipaddr.js entirely in your browser — no network requests are made.

IP Subnet Calculator - CIDR, IPv4 & IPv6 Networks

Status

Ready

Current state

Output

Available

286 chars

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Not favorited

Session

Draft

Unsaved work

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Input on the left, output on the right

Presets

Session

Accepts IPv4 and IPv6 in CIDR notation. Bare IP defaults to /32 or /128.

Input1L · 14

Output14L · 286 B

Ready

Version:        IPV4
CIDR:           192.168.1.0/24
Prefix Length:  /24

Network:        192.168.1.0
Broadcast:      192.168.1.255
First Host:     192.168.1.1
Last Host:      192.168.1.254

Total Hosts:    256
Usable Hosts:   254

Netmask:        255.255.255.0
Wildcard Mask:  0.0.0.255

Diagnostics

VersionIPV4

Prefix/24

Hosts256

Usable254

Processing completed successfully

IP Subnet Calculator

Features

Frequently Asked Questions

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