Калькулятор подсетей — Бесплатно Онлайн
Рассчитывайте IP-подсети, маску, диапазон хостов и широковещательный адрес.
Frequently Asked Questions
What is CIDR notation?
CIDR (Classless Inter-Domain Routing) notation expresses an IP address and its subnet mask together: 192.168.1.0/24. The number after / is the prefix length — the count of bits used for the network portion. /24 = 255.255.255.0 mask.
How many usable hosts does a /24 subnet have?
A /24 has 2^8 = 256 addresses total. Subtract 2 (network address and broadcast address) = 254 usable host addresses. Formula: 2^(32-prefix) − 2 usable hosts.
What are common subnet sizes?
/30 = 2 hosts (point-to-point links), /29 = 6 hosts, /28 = 14 hosts, /27 = 30 hosts, /26 = 62 hosts, /25 = 126 hosts, /24 = 254 hosts, /23 = 510 hosts, /22 = 1022 hosts.
What is the difference between subnet mask and wildcard mask?
Subnet mask has 1s for network bits and 0s for host bits: /24 = 255.255.255.0. Wildcard mask is the inverse: 0.0.0.255. Wildcard masks are used in Cisco ACLs and OSPF configurations.
Can I calculate IPv6 subnets?
Yes. Enter an IPv6 address with prefix length (e.g. 2001:db8::/32) and the tool calculates the range, host count, and subnet breakdown. IPv6 /64 subnets are standard for LAN segments.
Is the Калькулятор подсетей free to use?
Yes, the Калькулятор подсетей on Allio Tools is completely free with no sign-up or registration required. It works directly in your browser.
How does the Калькулятор подсетей work?
Рассчитывайте IP-подсети, маску, диапазон хостов и широковещательный адрес. No data is sent to a server — everything runs locally in your browser for maximum privacy and speed.
Do I need to install anything to use the Калькулятор подсетей?
No installation needed. The Калькулятор подсетей runs entirely in your web browser on any device — desktop, tablet, or mobile.
Is my data safe when using the Калькулятор подсетей?
Completely safe. The Калькулятор подсетей processes everything locally in your browser. No input data, results, or usage information is ever transmitted to or stored on any server.
Does the Калькулятор подсетей work offline?
After the page loads for the first time, the Калькулятор подсетей works without an internet connection for all client-side processing. Tools that fetch live external data (such as DNS or network lookups) require an active connection.
How current is the data returned by the Калькулятор подсетей?
The Калькулятор подсетей fetches live data in real time each time you run it. Results reflect the current state of the server or domain at the moment of the request.
Why does the Калькулятор подсетей sometimes return different results than other tools?
Results depend on the real-time state of the target server and DNS propagation, which can vary by geographic region and caching TTL. If you see inconsistencies, wait a few minutes and re-test — DNS changes can take up to 48 hours to propagate fully worldwide.
Does the Калькулятор подсетей work on all browsers?
Yes. The Калькулятор подсетей is built with standard browser APIs and works on all modern browsers including Chrome, Firefox, Safari, and Edge — on both desktop and mobile. No plugins, extensions, or third-party software are required.
How do I save or export my results from the Калькулятор подсетей?
Select and copy the result text to paste into any document or app. For image tools, a Download button saves the file directly to your device. Your browser's built-in screenshot function also captures results quickly. No account or login is required.