Network Tools

Netmask to CIDR Length Converter

Convert a dotted decimal netmask (e.g., 255.255.255.0) to its corresponding CIDR length (e.g., /24).

CIDR Length:
Error:

Subnet Usable Device Calculator

Calculate the total number of usable IP addresses (devices) within a given IP range or subnet (e.g., 192.168.1.0/24).

Total Usable Devices:
Error:

Advanced Subnet Calculator

Get detailed network information for any IP address and CIDR combination.

Network Address:

Broadcast Address:

First Usable Host:

Last Usable Host:

Total Hosts:

Usable Hosts:

Error:

Subnet Cheat Sheet

Quick reference for common CIDR notations and their subnet properties.

CIDR Netmask Total Hosts Usable Hosts
/8255.0.0.016,777,21616,777,214
/16255.255.0.065,53665,534
/24255.255.255.0256254
/25255.255.255.128128126
/26255.255.255.1926462
/27255.255.255.2243230
/28255.255.255.2401614
/29255.255.255.24886
/30255.255.255.25242
/31255.255.255.25420
/32255.255.255.25510

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