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IPv4 Tools
CIDR Calculator
IP Subnet Calculator
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IP Binary Converter
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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
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