IPv4 Subnet & CIDR Architecture Planner.

Precision CIDR calculator for network engineers and cloud architects. Model VPC address spaces, VLAN boundaries, usable host allocations, and wildcard ACL masks.

Subnet Configuration

Quick Architecture Presets:

IPv4 Address

Subnet Mask / Prefix (CIDR)

Usable Host Count

254

Total addresses: 256

Subnet Netmask

255.255.255.0

Prefix: /24

Network Type & Scope

Private (RFC 1918 Class A)

Class A

Cisco Wildcard Mask

0.0.0.255

ACL inverse bitmask

Subnet IP Allocation Range

Network ID (Subnet)	10.20.30.0 /24
First Usable Host IP	10.20.30.1
Last Usable Host IP	10.20.30.254
Broadcast Address	10.20.30.255

Binary Bit Breakdown (32-bit Address Space)

IP Address:00001010.00010100.00011110.00000000
Netmask:11111111.11111111.11111111.00000000

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