Networking
Subnet Calculator
Type an IPv4 address plus CIDR prefix to instantly see the network and broadcast addresses, usable host range, wildcard mask, and classful designation.
Break down IPv4 network, broadcast, host counts, and masks from CIDR notation.
Binary mask
11111111.11111111.11111111.00000000
CIDR fundamentals
Network = IP AND subnet mask. Broadcast = network OR wildcard. Usable hosts = 2^(32 − CIDR) − 2 (except /31 and /32, which are treated specially).
How to use
- Enter an IPv4 address such as 192.168.1.42 and set the CIDR prefix (0–32).
- Review the derived subnet mask, wildcard mask, network, and broadcast addresses.
- Copy the usable host range and capacity to plan VLANs, lab exercises, or certification homework.
Example
Input: IP = 192.168.1.42/26
Output: Network = 192.168.1.0, Broadcast = 192.168.1.63, Usable hosts = 62 (192.168.1.1–192.168.1.62)
Student-friendly breakdown
This walkthrough emphasizes the most searched ideas for Subnet Calculator: subnet calculator, cidr calculator, ipv4 subnet calculator, network mask calculator. Start with the formula above, then follow the guided steps to double-check your work. For quick revision, highlight the givens, plug into the equation, and finish by verifying your units.
Need more support? Use the links below to open the long-form guide, browse additional examples, or hop into adjacent calculators within the same topic. Each resource is interlinked so crawlers (and readers) can discover the next best action within a couple of clicks—one of the easiest ways to lift topical authority.
Deep dive & study plan
The Subnet Calculator is a go-to tool whenever you need to breaks down ipv4 networks into mask, host range, broadcast, and host counts.. It focuses on subnet calculator, cidr, ipv4, which means searchers often arrive with intent-heavy queries like “how to subnet calculator quickly” or “subnet calculator formula explained.” Use this calculator to capture those intents and keep learners on the page long enough to send positive engagement signals.
Under the hood, the calculator leans on network = ip and subnet mask. broadcast = network or wildcard. usable hosts = 2^(32 − cidr) − 2 (except /31 and /32, which are treated specially).—that’s why we surface the full expression (“Subnet Calculator”) directly above the interactive widget. When you embed that formula inside H2s or supporting paragraphs, you help both humans and crawlers understand what entity the page represents.
Execution matters as much as the math. Follow the built-in procedure: Step 1: Enter an IPv4 address such as 192.168.1.42 and set the CIDR prefix (0–32). Step 2: Review the derived subnet mask, wildcard mask, network, and broadcast addresses. Step 3: Copy the usable host range and capacity to plan VLANs, lab exercises, or certification homework.. Each numbered instruction is short enough to scan on mobile but descriptive enough to satisfy Google’s Helpful Content guidelines. Encourage students to jot down units, double-check signs, and compare answers with the Example card to build confidence.
The Example section itself is packed with semantic clues: “IP = 192.168.1.42/26” leading to “Network = 192.168.1.0, Broadcast = 192.168.1.63, Usable hosts = 62 (192.168.1.1–192.168.1.62).” Pepper similar narratives throughout your copy (and internal links from related guides) so canonical search intents are answered without pogo-sticking back to Google.
Quick retention checklist
- Speak the formula aloud (or annotate it) so the relationships stick.
- Write each step in your own words and compare with the numbered list above.
- Swap in new numbers for the Example to make sure the calculator (and your logic) handles edge cases.
- Link out to at least two related calculators to keep readers exploring your topical hub.
FAQ & notes
Does it support /31 or /32 links?
Yes. /31 shows the two point-to-point addresses as usable, while /32 reserves the single host without a broadcast address.
What about IPv6?
This tool focuses on IPv4 subnetting today. IPv6 planning is on the roadmap as a separate calculator.
What formula does the Subnet Calculator use?
Network = IP AND subnet mask. Broadcast = network OR wildcard. Usable hosts = 2^(32 − CIDR) − 2 (except /31 and /32, which are treated specially).
How do I use the Subnet Calculator?
Enter an IPv4 address such as 192.168.1.42 and set the CIDR prefix (0–32). Review the derived subnet mask, wildcard mask, network, and broadcast addresses. Copy the usable host range and capacity to plan VLANs, lab exercises, or certification homework.