IPv4 Subnet Calculator

Parse any IPv4 address and CIDR prefix (e.g. `192.168.1.0/24` or `10.0.0.0/16`). Calculates exact Network ID, Broadcast Address, Subnet Mask, Wildcard Mask, Usable Host IP Range, and total usable host count.

Why Use This Tool?

• Network Architecture & VPC Design: Calculate subnet ranges when building AWS VPCs, Azure VNets, or Cisco router networks.
• Firewall Rule Configuration: Determine network and broadcast boundaries for firewall rules and ACLs.
• Network Engineering Exams: Verify CCNA, CompTIA Network+, and AWS Certified SysOps subnetting homework.

How to Use

1. Enter IPv4 Address and Subnet Mask CIDR prefix (e.g. `192.168.1.50/24` or select `/28` from dropdown).
2. The tool computes binary subnets and IP boundaries in real time.
3. Copy Network IP, Broadcast IP, or usable host ranges.

Real Working Example

Input:

IP Address: 192.168.1.50 | CIDR Prefix: /24 (255.255.255.0)

Output Result:

Network IP: 192.168.1.0
Broadcast IP: 192.168.1.255
Usable Host Range: 192.168.1.1 – 192.168.1.254
Total Usable Hosts: 254 Hosts

Important Technical Details & Standards

• 32-Bit Bitwise Subnet Math: Performs bitwise AND `(IP & Mask)` to derive Network ID and bitwise OR `(Network | ~Mask)` for Broadcast ID.
• RFC 1918 Private Address Detection: Flags whether the IP belongs to 10.0.0.0/8, 172.16.0.0/12, or 192.168.0.0/16 private IP blocks.
• 100% Client-Side Engine: Fast in-browser bitwise calculation.

Related Networking & Security Tools

• VLSM Calculator: Allocate variable-length subnets by host needs.
• CIDR Aggregator: Merge adjacent IPv4 CIDR blocks.
• IPv4 Address Converter: Convert IP to Binary, Hex, and Decimal.