Keyboard: Use ↑/↓ to change values, ←/→ to navigate, ./ / for next octet/CIDR
256 addresses (2^8 = 256)
< 0.0001% of IPv4 space
Class C
Traditional range: 192.0.0.0 - 223.255.255.255
Default mask: /24
| CIDR Prefix: | 08162432 24 bits |
| Subnet Mask: | 11111111111111111111111100000000 255.255.255.0 |
| Wildcard Mask: | 00000000000000000000000011111111 0.0.0.255 |
The subnet mask uses 1 for network bits and 0 for host bits. The wildcard mask (inverse of subnet mask) uses 1 for host bits and 0 for network bits.
This network can be divided into 256 subnets (1 Class C (/24) subnets).
Subnetting divides a large network into smaller, more manageable segments. Each subnet is a distinct broadcast domain that can have its own access control and routing policies. Adding bits to the subnet mask creates more, smaller networks, while removing bits combines networks into larger ones (supernetting).
CIDR (Classless Inter-Domain Routing) notation is a compact method for specifying IP address ranges. It replaced the older class-based system (Class A, B, C) to allow for more efficient IP address allocation and routing.
192.168.1.0/24An IPv4 address consists of 4 octets (32 bits total), each containing values from 0-255. The / followed by a number (1-32) indicates how many bits are used for the network portion.
The first 24 bits (3 octets) identify the network
192.168.1.0/24→ Network IDThe remaining 8 bits identify hosts
2^8-2 = 254→ Usable addressesThe wildcard mask (inverse of subnet mask) is used in Cisco ACLs and route configurations. For a /24 network with subnet mask 255.255.255.0, the wildcard mask would be 0.0.0.255.