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Subnet Calculator

Local processing
Calculate subnet masks, network ranges, CIDR notation, and available hosts
Subnet Input
IP Address
Subnet
CIDR Notation
/0/8/16/24/32
Common Subnet Sizes
CIDRSubnet MaskUsable HostsDescriptionAction
/8255.0.0.016,777,214Class A
/16255.255.0.065,534Class B
/24255.255.255.0254Class C
/25255.255.255.128126Half C
/26255.255.255.19262Quarter C
/27255.255.255.224301/8 C
/28255.255.255.240141/16 C
/29255.255.255.24861/32 C
/30255.255.255.2522Point-to-Point
/31255.255.255.2542Point-to-Point (RFC 3021)
/32255.255.255.2551Host Route
Subnet Information
IP Address
192.168.1.0/24
IP ClassClass CNetwork Address
192.168.1.0
Broadcast Address
192.168.1.255
Subnet Mask
255.255.255.0
Wildcard Mask
0.0.0.255
First Usable Host
192.168.1.1
Last Usable Host
192.168.1.254
Total Addresses256
Usable Hosts254
Binary Representation
Network11000000.10101000.00000001.00000000
Subnet Mask11111111.11111111.11111111.00000000
Broadcast11000000.10101000.00000001.11111111
Network bits: 24 |Host bits: 8