Subnet Calculator

IPv4 & IPv6 subnetting with CIDR

Subnet Configuration

Select IP version and enter address with CIDR

IPv4 IPv6

e.g., 192.168.1.0 or 10.0.0.0

/24

Common values: /8, /16, /24, /30

Essential Information

IP Address

192.168.1.5

Network Address

192.168.1.0

CIDR Notation

192.168.1.0/24

Subnet Mask

255.255.255.0

Broadcast Address

192.168.1.255

Usable Host Range

192.168.1.1 - 192.168.1.254
Display Options

Select which information sections to display

Address Ranges

Network Address

192.168.1.0

First Usable IP

192.168.1.1

Last Usable IP

192.168.1.254

Broadcast Address

192.168.1.255
Subnet Mask Details

Subnet Mask (Dotted Decimal)

255.255.255.0

CIDR Notation

/16
Host Counts

Total Addresses

256

Usable Host Addresses

254

Wildcard Mask

Wildcard Mask (Dotted Decimal)

0.0.0.255

Used in ACLs and OSPF configurations (inverse of subnet mask)

IP Classification

Class

C

Scope

Private
Binary Subnet Mask

Network Bits (1) | Host Bits (0)

11111111.11111111.11111111.00000000

First 24 bits are network portion, remaining 8 bits are host portion.