Logo

Definitions

Pasted image 20241013185831.png

Host DeviceDevice on Network (PC, Phone, ..)
Network DeviceConnects Devices (Routers)
SubnetsHost devices that can be present.
Subnet MaskRatio of ==Network : Host== Devices.

CIDR Notation for Subnetting

Defines the Subnet via this format: [ip/mask]

Examples:

   192.168.172.10/24    =>    24 bits for Network :  8 remaining for Host
   192.168.172.10/16    =>    16 bits for Network :  16 remaining for Host
   192.168.172.10/12    =>    12 bits for Network :  20 remaining for Host

In Binary & Decimal Formats, these CIDR masks are:

   /24  =>   255.255.255.0  =>  11111111.11111111.11111111.00000000     (24 bits)
   /16  =>   255.255.0.0   =>   11111111.11111111.11111111.00000000     (16 bits)
   /12  =>   255.240.0.0   =>   11111111.11110000.00000000.00000000     (12 bits)

IP allocation in Subnets

Overview: The first & last IP of a subnet is allocated.

Network Device IPFirst Subnet of IP allocated
First Usable IPIP after first
Last Usable IPIP before last
Broadcast IPLast Subnet of IP allocated

Example: IP => 172.16.12.36/24
Here: Subnet Mask: /24 => 255.255.0.0 => 24 for Network : 8 for Host

Then IPs in this subnet will look like these:

	172.16.12.0        =>    Network IP
	172.16.12.1        =>   First Host IP
	172.16.12.2   
	.
	.
	.
	172.16.12.254     =>   Last Host IP 
	172.16.12.255     =>   Broadcast IP

© 2025 All rights reservedBuilt with DataHub Cloud

Built with LogoDataHub Cloud