IP Subnet Calculator
Calculate network address, broadcast address, subnet mask, and host range from any IPv4 address and CIDR notation.
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Master Your Network with IP Subnetting
Whether you're configuring a home network or managing enterprise infrastructure, understanding IP subnetting is essential. Our IP Subnet Calculator instantly breaks down any IPv4 address and CIDR notation into all the details you need.
What Is IP Subnetting?
Subnetting divides a large network into smaller, more manageable segments. Each subnet has its own network address, broadcast address, and range of usable host IPs. CIDR notation (like /24) specifies how many bits are used for the network portion.
The Core Concept
Network Address = IP Address AND Subnet MaskWhy Use This Calculator?
Quick Reference
Instantly see network ranges without manual binary math.
Avoid Errors
Prevent misconfiguration with accurate subnet calculations.
Learn Networking
See the binary representation to understand how subnetting works.
How to Use
Common Use Cases
Network Planning
Plan VLANs and network segments for your infrastructure.
Firewall Rules
Calculate ranges for ACLs and security rules.
DHCP Scopes
Determine host ranges for DHCP server configuration.
Certification Study
Practice subnetting for CCNA, CompTIA, and other IT exams.
Frequently Asked Questions
CIDR (Classless Inter-Domain Routing) notation like /24 indicates how many bits are used for the network portion. /24 means 24 bits for network (256 addresses), /25 is 128 addresses, /26 is 64, and so on.