IP Subnet Calculator
Calculate network subnets, host ranges, and subnet information for IP addresses
Network Configuration
Enter IP address and subnet information
IP Address Classes
Class A: 1.0.0.0 - 126.255.255.255 (/8)
Class B: 128.0.0.0 - 191.255.255.255 (/16)
Class C: 192.0.0.0 - 223.255.255.255 (/24)
Private Ranges:
- 10.0.0.0 - 10.255.255.255 (/8)
- 172.16.0.0 - 172.31.255.255 (/12)
- 192.168.0.0 - 192.168.255.255 (/16)
Common CIDR Notations
/8 → 255.0.0.0 (16,777,214 hosts)
/16 → 255.255.0.0 (65,534 hosts)
/24 → 255.255.255.0 (254 hosts)
/25 → 255.255.255.128 (126 hosts)
/26 → 255.255.255.192 (62 hosts)
/27 → 255.255.255.224 (30 hosts)
/28 → 255.255.255.240 (14 hosts)
/29 → 255.255.255.248 (6 hosts)
/30 → 255.255.255.252 (2 hosts)
Subnetting Guide
Key Concepts:
- • Network bits identify the network
- • Host bits identify individual hosts
- • Subnet mask separates network from host bits
- • CIDR notation shows prefix length (/24)
- • Wildcard mask is inverse of subnet mask
Calculations:
- • Total hosts = 2^(32-CIDR)
- • Usable hosts = Total hosts - 2
- • Network address: first address
- • Broadcast address: last address
- • First host: Network + 1
- • Last host: Broadcast - 1