IP Subnet Calculator - Professional IPv4 & IPv6 Network Tool

Calculate IPv4 and IPv6 subnet details with our professional IP subnet calculator. Get network ID, subnet mask, broadcast address, host range, and more. Perfect for network engineers and system administrators.

Please enter an IPv4 address and choose the mask:

Please enter an IPv6 address and choose the prefix length:

Inputs

An IPv4 address and mask (CIDR or dotted-decimal)
An IPv6 address and prefix length

Outputs

Network ID / prefix
Subnet mask / prefix length
Broadcast address (IPv4)
Usable host range
Total host count
Wildcard mask and address class (IPv4)

Use Cases

Planning a new subnet block
Validating a customer-supplied range
Quick lookup during incident response

Limitations

Single subnet per calculation — use VLSM Calculator for splits
Pure-browser math, no external lookups

Example Input

192.168.1.0/24

Example Output

Network:        192.168.1.0
Mask:           255.255.255.0  (/24)
Broadcast:      192.168.1.255
Host range:     192.168.1.1 – 192.168.1.254
Host count:     254