IPv4 Subnet Calculator

Calculate IPv4 subnet information, supporting subnet division and supernet merging.

Enter IP address and subnet mask to calculate

IP Address

Subnet Mask (CIDR)

Calculation Type

Click to apply common subnet configs

Class C Default

254 hosts

/24 - 255.255.255.0

Class B Default

65534 hosts

/16 - 255.255.0.0

Class A Default

16777214 hosts

/8 - 255.0.0.0

Large Subnet

126 hosts

/25 - 255.255.255.128

Medium Subnet

62 hosts

/26 - 255.255.255.192

Small Subnet

30 hosts

/27 - 255.255.255.224

Tiny Subnet

14 hosts

/28 - 255.255.255.240

Point-to-Point

6 hosts

/29 - 255.255.255.248

P2P Minimal

2 hosts

/30 - 255.255.255.252

Click to use sample network address

192.168.1.0 /24

10.0.0.0 /8

172.16.0.0 /16

203.0.113.0 /24

192.0.2.0 /24

Class A: 1.0.0.0 - 126.255.255.255

Class B: 128.0.0.0 - 191.255.255.255

Class C: 192.0.0.0 - 223.255.255.255

Private: 10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16