SubnetCalculate

CIDR Calculator IP Subnet Calculator Subnet Mask Calculator CIDR to IP Range Visual Subnet Calculator VLSM Calculator

Netmask to CIDR IP Binary Converter Wildcard Mask Calculator IPv4 to IPv6 Converter

Network Address Calculator Broadcast Address Calculator IP Address Validator

IPv6 Subnet Calculator IPv6 Compressor IPv6 Expander IPv6 Validator IPv6 Type Identifier IPv6 Range Calculator IPv6 Reverse DNS

Search tools

Menu

Subnet Calculator

IPv4 Tools

CIDR Calculator IP Subnet Calculator Subnet Mask Calculator CIDR to IP Range Visual Subnet Calculator VLSM Calculator

Converters

Netmask to CIDR IP Binary Converter Wildcard Mask Calculator IPv4 to IPv6 Converter

Network Tools

Network Address Calculator Broadcast Address Calculator IP Address Validator

IPv6 Tools

IPv6 Subnet Calculator IPv6 Compressor IPv6 Expander IPv6 Validator IPv6 Type Identifier IPv6 Range Calculator IPv6 Reverse DNS

Sitemap

Browse every tool and page on SubnetCalculate.

Home

Free IPv4 Subnetting Calculator Online

Main Calculators

Find the Right Subnet Mask for Your Hosts
CIDR Block Boundary & Host Range Tool
VLSM Allocation Planner for Efficient IP Use
Plan IPv6 Subnets and Address Boundaries

IPv4 Tools

Calculate Subnet Details from IP and Mask
Wildcard Mask Tool for OSPF & ACL Configs
Calculate the Last Usable Address in a Subnet
Find the Network Address of Any Subnet
Expand a CIDR Block Into Its Full IP Range
Interactive Subnet Map for Network Design
Bi-Directional Netmask to CIDR Conversion

Converters & Validators

Convert IPv4 to Mapped & 6to4 IPv6 Addresses
Validate IPv4 & IPv6 Address Formatting
View the Binary Breakdown of Any IP Address

IPv6 Tools

Calculate Total Addresses in an IPv6 Range
Compress IPv6 Addresses Using Zero Suppression
Restore Full IPv6 Notation from Shorthand
Check IPv6 Address Formatting for Errors
Build Reverse DNS Zone Entries for IPv6
Classify Any IPv6 Address by Type and Scope

About & Legal

About Us
Contact
Privacy Policy
Terms of Use

Last updated October 9, 2026

SubnetCalculate

Free online networking tools for IT professionals, network engineers, and students.

IPv4 Tools

Calculate Full IPv4 Subnet Details
Convert CIDR Notation to Subnet Mask & Range
Find Network, Broadcast & Usable Host Range
Convert CIDR Prefix to Dotted-Decimal Mask
List First, Last & Total IPs in a CIDR Block
Visually Split a Network Into Smaller Subnets
Plan Variable-Length Subnets for Multiple Hosts

Converters & Network

Switch Between Subnet Mask and CIDR Prefix
Convert IP Addresses to Binary Octets
Convert Subnet Masks for Cisco ACL Rules
Map IPv4 Addresses to IPv6 Formats
Determine the Network ID for Any IP and Mask
Get the Broadcast Address for Any Subnet
Check if an IP Address Format Is Valid

IPv6 Tools

Calculate Network Range for Any IPv6 Prefix
Shorten Full IPv6 Addresses to Compact Form
Expand Compressed IPv6 to Full 8-Group Form
Verify IPv6 Syntax Against RFC 4291
Identify Global Unicast, Link-Local & Multicast
Find Start and End Addresses in an IPv6 Block
Generate ip6.arpa PTR Records for IPv6

Company

About Us
Contact
Privacy Policy
Terms of Use
Sitemap

© 2025 SubnetCalculate. All rights reserved. Free networking tools for the community.