Network Calculator & VLAN Planner

IPv4/IPv6 subnet calculation, VLAN planning, conflict detection, and network documentation.

Generated Configuration

            
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Network Configuration

Mode Selection
Network Configuration
IPv4: 192.168.0.0/16 | IPv6: 2001:db8::/32
VLAN Planning
Quick Templates

Frequently Asked Questions

IPv4 uses 32-bit addresses with traditional subnet masks, while IPv6 uses 128-bit addresses with prefix notation. IPv6 subnetting is typically done on nibble boundaries (4-bit increments) and doesn't require broadcast addresses.
Use our conflict detection feature and avoid overlapping address ranges. Plan your network hierarchy carefully, use consistent subnet sizes where possible, and document all assignments to prevent future conflicts.
Avoid VLAN 1 (default), use 10-99 for infrastructure, 100-999 for users, 1000+ for services. Reserve ranges for different purposes and document your VLAN scheme for consistency across your network.
/24 (254 hosts) for most LANs, /26 (62 hosts) for smaller departments, /30 (2 hosts) for point-to-point links, /29 (6 hosts) for small server clusters. Always plan for 30-50% growth in host count.
Yes, the generated configurations follow industry best practices. However, always review and test in a lab environment first, and adapt the configurations to your specific security policies and network requirements.
Copy the VLAN and interface configurations to your Cisco switch via console or SSH. Apply configurations during maintenance windows and verify connectivity before deploying to production networks.

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