Build your IP Subnet Calculator with AI in under 5 minutes

Build an IPv4 subnet / CIDR calculator that turns an address and prefix into the network and broadcast address, subnet mask, wildcard mask, usable host range, host count, IP class, and public/private — all in the browser, with a live prefix slider.

Jak to działa

Krok 1

Opisz swój pomysł

Napisz prompt w zwykłym tekście opisujący, czego chcesz.

Krok 2

AI to buduje

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Krok 3

Wdróż i uruchom

Twój projekt jest hostowany na własnej subdomenie w kilka minut.

Dlaczego warto budować z AI zamiast zatrudniać dewelopera?

FloopFloopTradycyjny deweloper
Czas do uruchomieniaMniej niż 5 minut2–8 tygodni
KosztOd 0 USD5 000 USD – 50 000 USD+
UtrzymanieW cenieStała umowa serwisowa

What is a ip subnet calculator?

An IP subnet calculator takes an IPv4 address and a CIDR prefix and works out everything that follows: the network and broadcast addresses, the subnet and wildcard masks, the range of usable host addresses, how many hosts the block holds, and whether it's a private or public range. It's a daily tool for anyone who designs or troubleshoots networks — planning a VLAN, writing a firewall rule, carving an address space into subnets, or just sanity-checking which network a given IP belongs to. The canonical tools (the subnet and CIDR calculators network engineers keep bookmarked) all do the same job; the details that matter are getting the host-count arithmetic right — including the /31 point-to-point and /32 single-host exceptions — and computing it without the classic 32-bit signed-integer overflow bug that breaks a naive implementation at /0.

Common features

  • CIDR input (address + prefix)
  • A live prefix slider (0–32)
  • Network and broadcast addresses
  • Subnet mask and wildcard mask
  • First and last usable host
  • Usable host count and total addresses
  • IP class (A/B/C/D/E)
  • Private (RFC 1918) vs public detection
  • /31 (RFC 3021) and /32 special-case handling
  • Everything client-side, copyable; light and dark themes

Real-world examples

Planning a subnet

An engineer types 10.0.0.0/8 and drags the prefix to /20, watching the usable host count and address range update to size each subnet correctly.

Writing a firewall rule

Someone needs the wildcard mask for an ACL, enters the network in CIDR, and copies 0.0.0.255 straight into the rule.

Checking an address

A developer confirms that 172.16.20.5/20 is a private (RFC 1918) class-B address sitting in the 172.16.16.0 network.

Why FloopFloop fits ip subnet calculator projects

A subnet calculator is the kind of tool you want instant, ad-free, and correct on the edge cases. FloopFloop ships the calculator you want — the fields you use, IPv6 if you ask for it, your team's address plan — on your own domain, with all the math running in the browser. The 'network console' that ships by default lays out every value in clean monospace rows with a prefix slider to explore, and the whole thing is one prompt away from being whatever fits your workflow.

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Skopiuj dowolny prompt poniżej i wklej go do FloopFloop, aby zacząć.

Build an IPv4 subnet calculator. Enter an address in CIDR notation (e.g. 192.168.1.0/24) and show the network address, broadcast address, subnet mask, wildcard mask, first and last usable host, the usable host count, the total addresses, the IP class, and whether it's private (RFC 1918) or public. Add a prefix slider (0–32) that updates everything live. Do the IPv4 math with plain numbers in the 0…2^32-1 range (not 32-bit bitwise ops, so /0 doesn't sign-overflow), and handle the /31 (RFC 3021, both addresses usable) and /32 (single host) special cases. Make each value copyable, keep it deterministic so the first render is hydration-safe, and remember the input in localStorage. 100% client-side.

Create a CIDR calculator like the ones network engineers use: type 10.0.0.0/8 and see the mask, address range, and how many hosts it holds. Keep it in the browser.

Build a subnet mask calculator with a slider for the prefix length so I can watch the host count and range change as I drag it. Add a dark console theme.

Build a tool that takes an IP and CIDR prefix and breaks out the network, broadcast, netmask, wildcard, and usable range — handy for planning VLANs and firewall rules.

Najczęściej zadawane pytania

What does it calculate from a CIDR like 192.168.1.0/24?
The network address (192.168.1.0), the broadcast (192.168.1.255), the subnet mask (255.255.255.0), the wildcard mask (0.0.0.255), the first and last usable host (192.168.1.1–192.168.1.254), the usable host count (254), the total addresses (256), the IP class, and whether the block is private or public.
Why are there 254 usable hosts in a /24, not 256?
A /24 holds 256 addresses, but the first is the network address and the last is the broadcast address, neither of which is assigned to a host — leaving 254 usable. The calculator handles the exceptions too: a /31 has 2 usable addresses for point-to-point links (RFC 3021), and a /32 is a single host.
What's the wildcard mask for?
It's the inverse of the subnet mask (0.0.0.255 for a /24) and is what ACLs and routing protocols like OSPF use to match an address range — so it's handy to have alongside the netmask.
How is this different from a number base converter?
A base converter changes how a single integer is written (hex vs binary). A subnet calculator works out network addressing — which block an IP belongs to, its range, and its mask — which is a different kind of math built on IPv4 addresses.
Is anything sent to a server?
No. Every calculation runs in your browser and your last input is saved to localStorage only. The single outbound surface is the /api/health probe.

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