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Subnet & CIDR IP Calculator & Visualizer

Comprehensive IPv4 CIDR and subnet engineering workbench: calculates usable host boundaries, broadcast IP, wildcard mask, binary 32-bit bitmask breakdown, RFC 1918 private vs public scope, and interactive VPC subnet division planner (/0 to /32).

✓ Precision IPv4 CIDR calculator with interactive prefix slider (/0 to /32)✓ Usable host boundaries, network ID, broadcast & wildcard masks✓ 32-bit binary bitmask visualization (Network bits vs Host bits)✓ RFC 1918 Private (10.0.0.0, 172.16.0.0, 192.168.0.0) vs Public scope✓ Interactive Subnet Division & VPC micro-segmentation table✓ Real-time 'Is IP in Subnet?' membership tester
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/24
Common Presets:
Usable Hosts
254
Total: 256 IPs
Subnet Mask
255.255.255.0
Wildcard: 0.0.0.255
Network Class
Class C
/24 Prefix
Scope Classification
RFC 1918 Private (192.168.0.0/16)
Non-routable RFC 1918

CIDR Network Boundaries

Canonical CIDR: 192.168.1.0/24

Network AddressFirst IP, reserved for wire network identifier
192.168.1.0
First Usable HostTypically assigned to default gateway
192.168.1.1
Last Usable HostHighest assignable endpoint in subnet
192.168.1.254
Broadcast AddressReserved for all-host subnet broadcasting
192.168.1.255
Subnet Mask32-bit dotted-decimal network bitmask
255.255.255.0
Wildcard MaskInverse bitmask used in Cisco/ACL firewall filters
0.0.0.255

32-Bit Binary Bitmask Visualization

Bit breakdown showing Network Bits (24) and Host Bits (8).

Network Binary:11000000.10101000.00000001.00000000
Netmask Binary:11111111.11111111.11111111.00000000

Test IP In Subnet Membership

Verify if an individual IP address resides within this network block.

Yes, 192.168.1.45 falls inside 192.168.1.0/24

Subnet Division & VPC Micro-Segmentation Planner

Split current /24 into smaller subnets for AWS, Azure, GCP, or multi-VLAN segmentation.

Split into:
#Subnet CIDRUsable Host RangeBroadcastHosts
1192.168.1.0/26192.168.1.1 – 192.168.1.62192.168.1.6362
2192.168.1.64/26192.168.1.65 – 192.168.1.126192.168.1.12762
3192.168.1.128/26192.168.1.129 – 192.168.1.190192.168.1.19162
4192.168.1.192/26192.168.1.193 – 192.168.1.254192.168.1.25562
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