192.168.1.0
192.168.1.255
192.168.1.1
192.168.1.254
255.255.255.0
0.0.0.255
254
/24
C
Ja
Delar 192.168.1.0/24 i /26 ger 4 subnät.
192.168.1.0/26
192.168.1.64/26
192.168.1.128/26
192.168.1.192/26
(Dokumentation på engelska)
What it does
The Subnet / CIDR Calculator turns any IPv4 CIDR block - like 192.168.1.0/24 - into a full subnet breakdown: network address, broadcast address, first and last usable host, subnet mask, wildcard mask, host count, classful IP class, and whether the range is private (RFC 1918). It also splits a block into smaller subnets of any prefix you choose. Everything runs 100% client-side, so nothing leaves your browser.
How to use it
- Type a CIDR block into the CIDR block field (e.g.
10.0.0.0/8), or hit Sample. - Read the result grid: network, broadcast, host range, mask, wildcard, host count, class, and private-range flag - each with its own Copy button.
- To divide the block, enter a larger prefix under Split into smaller subnets and review the generated child subnets.
- Copy share link encodes your CIDR and split prefix in the URL, so a teammate sees the exact view.
Examples
Home network
192.168.1.0/24 → Network 192.168.1.0, Broadcast 192.168.1.255, Hosts 254, Mask 255.255.255.0, Class C, Private: Yes.Point-to-point link
10.0.0.0/31 → 2 usable hosts (first = 10.0.0.0, last = 10.0.0.1), used for router-to-router links.Split a /24
192.168.1.0/24 split into /26 → 192.168.1.0/26, 192.168.1.64/26, 192.168.1.128/26, 192.168.1.192/26.Good to know
- Host counts follow the standard rules:
2^(32−prefix) − 2for/1-/30;/31returns 2 (point-to-point, per RFC 3021);/32returns 1 (single host). - Private ranges detected:
10.0.0.0/8,172.16.0.0/12,192.168.0.0/16(RFC 1918). - Normalization: a host IP like
192.168.1.5/24is masked to its network192.168.1.0/24before splitting. - Shareable: the CIDR and split prefix live in the URL (
?cidr=…&split=…). - Related tools: Data Unit Converter, Number Base Converter.