Subnetting Practice Labs

Master subnetting with hands-on exercises from basic to advanced

Beginner ⏱️ 20 min

Basic Subnetting - Class C

Learn to subnet a Class C network into smaller subnets

  • Understand subnet masks
  • Calculate number of subnets
  • Determine host ranges
Beginner ⏱️ 25 min

Subnet Mask Conversion

Practice converting between decimal and CIDR notation

  • Convert /24 to 255.255.255.0
  • Convert subnet masks to CIDR
  • Understand prefix lengths
Intermediate ⏱️ 30 min

Class B Subnetting

Subnet a Class B network for multiple departments

  • Divide 172.16.0.0/16
  • Calculate subnet boundaries
  • Identify broadcast addresses
Intermediate ⏱️ 35 min

VLSM Design

Use Variable Length Subnet Masking for efficient addressing

  • Design network with VLSM
  • Minimize address waste
  • Assign appropriate subnet sizes
Intermediate ⏱️ 30 min

Subnet for Requirements

Design subnets based on specific host requirements

  • Meet host count requirements
  • Calculate optimal subnet mask
  • Verify subnet capacity
Advanced ⏱️ 40 min

Route Summarization

Summarize multiple networks into a single route

  • Identify common bits
  • Calculate summary address
  • Determine summary mask
Advanced ⏱️ 45 min

Complex VLSM Scenario

Design a complete network using VLSM for multiple sites

  • Multi-site network design
  • WAN link addressing
  • Complete IP addressing plan
Advanced ⏱️ 35 min

IPv6 Subnetting

Practice subnetting with IPv6 addresses

  • Understand IPv6 prefix lengths
  • Subnet IPv6 networks
  • Calculate IPv6 ranges
Beginner ⏱️ 20 min

Binary Practice

Master binary to decimal conversion for subnetting

  • Convert IP to binary
  • Perform binary AND operations
  • Identify network addresses
Intermediate ⏱️ 30 min

Troubleshooting Subnets

Identify and fix subnet configuration errors

  • Find overlapping subnets
  • Identify incorrect masks
  • Fix addressing conflicts

Subnet Calculator

Calculate subnet details instantly

Input

Results

IP Address: -
Network Address: -
Broadcast Address: -
First Usable Host: -
Last Usable Host: -
Usable Hosts: -
Subnet Mask: -
Wildcard Mask: -
CIDR Notation: -
IP Class: -
IP Type: -
Binary Subnet Mask: -

Subnetting Quick Reference

Common Subnet Masks

CIDR Subnet Mask Hosts
/24255.255.255.0254
/25255.255.255.128126
/26255.255.255.19262
/27255.255.255.22430
/28255.255.255.24014
/29255.255.255.2486
/30255.255.255.2522

Subnetting Formulas

  • Number of Subnets: 2^n (where n = borrowed bits)
  • Number of Hosts: 2^h - 2 (where h = host bits)
  • Network Address: First address in subnet
  • Broadcast Address: Last address in subnet
  • First Usable Host: Network + 1
  • Last Usable Host: Broadcast - 1