More detailsNeighboring subnets, wildcard mask, hex, reverse DNS, and binary breakdown
Neighboring /24 subnets
- Wildcard mask
- Used in Cisco ACLs and OSPF
- CIDR notation
- IP in hexadecimal
- IP as 32-bit integer
- Reverse DNS (PTR)
- Host bits / subnet bits
Binary breakdown
IP address
11000000.10101000.00000001.00000000Subnet mask
11111111.11111111.11111111.00000000Network
11000000.10101000.00000001.00000000Broadcast
11000000.10101000.00000001.11111111Quick facts for /24
- Subnet mask: 255.255.255.0
- Wildcard: 0.0.0.255
- Usable hosts: 254
- Total addresses: 256
/24 reference guideBit split, overview, sizing tables, notable networks, and FAQ
Binary bit split
11111111·11111111·11111111·00000000
Network bits (24)Host bits (8)
- Network bits
- 24
- Host bits
- 8
- Subnet mask
- 255.255.255.0
- Wildcard mask
- 0.0.0.255
- Total addresses
- 256
- Usable hosts
- 254
- Hosts formula
- 2^8 − 2
- /24 relationship
- 1 × /24 networks
Overview
A /24 block is the most widely used CIDR size. It contains 256 addresses with 254 usable and has the subnet mask 255.255.255.0. It maps to a single "octet" of host addresses and is the default for home networks, small offices, and cloud subnets worldwide.
Common use cases
- Home and small office networks (192.168.x.0/24)
- Cloud VPC subnets (AWS, Azure, GCP)
- VLAN segments in enterprise environments
- Hotel and venue guest Wi-Fi networks
- CCNA/Network+ lab and study networks
Subnet sizing reference
Notable /24 networks
192.168.1.0/24Most common home router network192.168.0.0/24Common home router variant10.0.0.0/24Common cloud or lab subnet
Frequently asked questions
Common questions about /24 networks, subnet masks, and use cases.