IPv4 & IPv6 Subnet & CIDR Mask Calculator
Calculate subnet masks, wildcard masks, usable host ranges, and total address space.
About IPv4 & IPv6 Subnet & CIDR Mask Calculator Pro
Design and troubleshoot computer networks effortlessly with our IPv4 & IPv6 Subnet & CIDR Mask Calculator Pro. Quickly computes network addresses, broadcast addresses, usable host ranges, wildcard masks, and total address space for any IPv4 or IPv6 CIDR block.
Subnet Calculator Features
- 🌐 Dual IPv4 & IPv6 Support: Calculate legacy IPv4 (/0 to /32) and next-gen IPv6 (/0 to /128) CIDR allocations.
- 🔢 Binary IP Breakdown: Visual binary network bits and host bits highlighting for students and engineers.
- 📊 Subnetting Table: Instant overview of all child subnets and usable IP spans.
- 📋 1-Click Copy: Copy CIDR, Netmask, and Host Range with single clicks.
How to Calculate Subnet Ranges
- Enter any valid IP address (e.g. 192.168.1.50 or 2001:db8::1).
- Select your CIDR prefix (e.g. /24 for 256 IPs or /28 for 16 IPs).
- Review the calculated network address, broadcast IP, and usable host range.
- Copy the configuration parameters for your router or firewall.
Frequently Asked Questions (FAQ)
What is CIDR notation?
Classless Inter-Domain Routing (CIDR) specifies an IP address followed by a slash and the number of leading bits in the routing prefix (e.g. 10.0.0.0/8).
How many usable hosts are in a /24 subnet?
A /24 subnet has 256 total IP addresses, with 254 usable hosts (excluding network ID .0 and broadcast .255).
Is this subnet calculator free?
Yes, it is 100% free with comprehensive binary breakdowns.
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