No. Everything here is 32-bit IPv4 arithmetic, and an IPv6 address is rejected as invalid.

What counts as a usable host?

Total addresses minus the network address and the broadcast address, for every prefix from /0 to /30, a /24 reports 256 total and 254 usable. /31 and /32 are the two exceptions, handled as described above.

Subnet Calculator

No upload · runs in your browser

IPv4 address and prefix

Network address192.168.1.0/24

Subnet mask255.255.255.0

Wildcard mask0.0.0.255

Broadcast address192.168.1.255

First usable host192.168.1.1

Last usable host192.168.1.254

Total addresses256

Usable hosts254

ScopePrivate (RFC 1918)

TypeStandard subnet

Binary breakdown, the first 24 bits are the network

Address11000000.10101000.00000001.01100100

Mask11111111.11111111.11111111.00000000

Network11000000.10101000.00000001.00000000

Broadcast11000000.10101000.00000001.11111111

Bitwise maths done on your device, your addressing plan is never uploaded.

How it works

IPv4 Subnet Calculator with a Bit-Level Breakdown

Type an IPv4 CIDR and get the network, broadcast, usable host range, mask and wildcard, plus the bit pattern that produces them. /31 and /32 are handled properly.

What this does

Network, broadcast, first and last usable host from any IPv4 address carrying a prefix
Takes /24 or 255.255.255.0, and rejects a mask whose 1 bits are not contiguous from the left
Wildcard mask shown beside the subnet mask, for Cisco ACLs and OSPF network statements
Binary breakdown of address, mask, network and broadcast with the network bits coloured
Scope label for RFC 1918 private, loopback, link-local, carrier-grade NAT, multicast and reserved ranges

FAQ

A /31 holds two addresses, so the usual network-plus-broadcast rule would leave zero usable hosts. RFC 3021 redefines it for point-to-point links: both addresses are endpoints and there is no broadcast. A /32 is a single host route, one address, itself. Both appear in the Type row rather than being reported as 0 or −1 hosts.

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