IPv4 Subnet Calculator - MacigHub

Calculate IPv4 subnet CIDR ranges: network address, broadcast, host count, wildcard mask, class and CIDR notation.

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About this tool

What is a subnet calculation?

It splits an IPv4 network (e.g. 192.168.1.0/24) into the network address, broadcast address, usable host range, subnet mask, wildcard mask and host count. Essential for VLAN planning, firewall rules and cloud VPC design.

How to use it

Enter an IP with CIDR notation (/24) or an explicit mask.
Read the usable range — first and last addresses are reserved.
Split into smaller subnets when segmenting departments or tiers.

Examples

10.0.0.0/24 gives 254 usable hosts (.1–.254); .0 is network, .255 broadcast.
Carving four /26 subnets (62 hosts each) out of one /24.
Checking whether two hosts sit in the same broadcast domain.

Important limitations

Calculator math assumes standard subnetting; exotic setups (NAT overlap, anycast) need architect review.
Usable-host math excludes network and broadcast — a /31 is a special point-to-point case.
IPv6 uses the companion IPv6 tools; v4 math does not transfer.

Privacy

All computation is local. Internal IP schemes stay in your browser — good, since they map your infrastructure.

Frequently asked questions

How many hosts in a /24?

254 usable. Each extra CIDR bit halves the count: /25 → 126, /26 → 62.

Network vs broadcast address?

First address names the network, last shouts to everyone on it — neither is assignable to a host.

What mask gives me ~500 hosts?

/23 (510 usable). Size up one step beyond your need for growth.