Netmask
255.255.255.0
Usable hosts
254
What is the IPv4 Subnet Calculator?
The IPv4 Subnet Calculator is a free online ip tools from Markvibe. Compute hosts and netmask for any CIDR. It runs entirely in your browser — your data never gets uploaded — and works on desktop, tablet and mobile with no sign-up.
Reviewed by The Markvibe Team · Last updated 2026-06-28
Example
A worked example so you know exactly what to expect.
Input
(your input goes here)
Output
(the IPv4 Subnet Calculator runs in your browser and shows the result instantly)
How to use IPv4 Subnet Calculator
- 1Open the IPv4 Subnet Calculator above on MarkVibe — it loads instantly with no sign-up.
- 2Enter or paste your input into the IPv4 Subnet Calculator field.
- 3Adjust any options to control exactly how IPv4 Subnet Calculator produces the result.
- 4IPv4 Subnet Calculator runs locally in your browser and shows the result immediately.
- 5Copy the output to your clipboard or save it, then share the IPv4 Subnet Calculator link with anyone.
Why use our IPv4 Subnet Calculator
- ✓ 100% free IPv4 Subnet Calculator — no sign-up, no watermark, no hidden limits
- ✓ Runs entirely in your browser so your data never leaves your device
- ✓ Blazing-fast results — built for speed by Markvibe
- ✓ Mobile-friendly: use IPv4 Subnet Calculator on phone, tablet, or desktop
- ✓ One of 184+ ip tools utilities under one roof
- ✓ Privacy-first: no tracking of inputs, no accounts, no ads in the tool area
IPv4 Subnet Calculator — frequently asked questions
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