VLSM Calculator | Variable Length Subnet Mask
VLSM calculator that splits one network into right-sized subnets from your host counts. Shows CIDR, mask, host ranges, broadcast and wasted IPs. Free.
Also known as: vlsm calculator · variable length subnet mask calculator · vlsm subnetting calculator · subnet allocation calculator · cidr block allocator · vlsm chart generator · ip subnet planner · subnetting practice calculator
Liked this tool?
DevToolLab is free to use. If this networking saved you some time today, please consider supporting our work.
Frequently asked questions
What is VLSM Calculator used for?
VLSM calculator that splits one network into right-sized subnets from your host counts. Shows CIDR, mask, host ranges, broadcast and wasted IPs. Free.
Is VLSM Calculator free to use?
Yes. VLSM Calculator is completely free with no usage limits, and there is no paid tier required to use it.
Do I need an account to use VLSM Calculator?
No. VLSM Calculator works immediately in your browser with no signup, login, or email address required.
Related Tools
Free URL status and HTTP response checker. See the status code, response headers, every 301/302 redirect hop and the response time for any link. No signup.
Generate a unique URL to easily test, receive and inspect HTTP webhooks in real-time. View request headers, query parameters, JSON payloads, and more.
Subnet calculator computes IPv4 network masks, broadcast addresses, and host ranges from any IP and CIDR prefix - fast, free, and works entirely in your browser.