Network & DNS
IPv4 & IPv6 Subnet Calculator
Calculate exact CIDR network boundaries, subnet and wildcard masks, address counts (BigInt /0 to /128), IPv6 expanded/compressed forms, and range membership offline.
Exact offline BigInt arithmetic (`/0`–`/32` IPv4, `/0`–`/128` IPv6) — zero IP lookups or telemetry.
Examples:
192.168.1.0/24
IPv4/24Scope: RFC 1918 Private (192.168.0.0/16)
- Network Address
- 192.168.1.0
- First Usable Host
- 192.168.1.1
- Last Usable Host
- 192.168.1.254
- Broadcast Address
- 192.168.1.255
- Subnet Mask
- 255.255.255.0
- Wildcard: 0.0.0.255
- Total Addresses
- 256
- Usable hosts: 254
- Binary Breakdown
- 11000000.10101000.00000001.00110010
- Mask bits: 11111111.11111111.11111111.00000000
Range Membership Check
Test whether an IP address lies within 192.168.1.0/24.