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🦀 ClawHub

Cidr Calc

by @ohernandez-dev-blossom

Calculate subnet information from CIDR notation. Use when the user asks to calculate a subnet, find the network address, broadcast address, host range, subne...

Versionv1.0.0

Downloads561

#legal

View on ClawHub →

TERMINAL

clawhub install cidr-calc

📖 About This Skill

name: cidr-calc description: Calculate subnet information from CIDR notation. Use when the user asks to calculate a subnet, find the network address, broadcast address, host range, subnet mask, or number of hosts for an IP in CIDR notation like 192.168.1.0/24.

CIDR Calculator

Given an IP address in CIDR notation, compute all subnet parameters: network address, broadcast, host range, subnet mask, wildcard mask, host counts, IP class, and binary representation.

Input

A CIDR notation string in the format A.B.C.D/N (e.g. 192.168.1.0/24)

Output

A structured result with these fields:

CIDR Notation (normalized)

Network Address

Broadcast Address

Subnet Mask

Wildcard Mask

First Usable Host

Last Usable Host

Total Hosts (2^(32-N))

Usable Hosts

IP Class (A / B / C / D Multicast / E Reserved)

Network Type (Private / Public)

Binary Representation of the IP

Instructions

1. Validate the input. It must match \d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}\/\d{1,2}. Each octet must be 0–255. Prefix must be 0–32. 2. Compute values using standard subnet math: - maskNum = (0xFFFFFFFF << (32 - prefix)) >>> 0 - wildcardNum = ~maskNum >>> 0 - networkNum = (ipNum & maskNum) >>> 0 - broadcastNum = (networkNum | wildcardNum) >>> 0 - totalHosts = 2^(32 - prefix) - usableHosts: if prefix == 32 → 1; if prefix == 31 → 2; else totalHosts - 2 3. Determine IP class from first octet: - 1–126 → A; 128–191 → B; 192–223 → C; 224–239 → D (Multicast); 240–255 → E (Reserved); 127 → Loopback 4. Determine private vs public: - Private: 10.x.x.x, 172.16–31.x.x, 192.168.x.x, 127.x.x.x (loopback) 5. Compute binary as four 8-bit groups joined by dots. 6. Present results in a clear labeled format.

Quick CIDR reference

| CIDR | Subnet Mask | Total Hosts | |------|-------------------|-------------| | /8 | 255.0.0.0 | 16,777,216 | | /16 | 255.255.0.0 | 65,536 | | /20 | 255.255.240.0 | 4,096 | | /22 | 255.255.252.0 | 1,024 | | /24 | 255.255.255.0 | 256 | | /28 | 255.255.255.240 | 16 | | /30 | 255.255.255.252 | 4 | | /32 | 255.255.255.255 | 1 |

Options

Input is always a single CIDR string; no additional options.

Examples

Input: 192.168.1.0/24

Output:

CIDR Notation:   192.168.1.0/24
Network Address: 192.168.1.0
Broadcast:       192.168.1.255
Subnet Mask:     255.255.255.0
Wildcard Mask:   0.0.0.255
First Host:      192.168.1.1
Last Host:       192.168.1.254
Total Hosts:     256
Usable Hosts:    254
IP Class:        C
Network Type:    Private
Binary:          11000000.10101000.00000001.00000000

Input: 10.0.0.0/8

Output:

CIDR Notation:   10.0.0.0/8
Network Address: 10.0.0.0
Broadcast:       10.255.255.255
Subnet Mask:     255.0.0.0
Wildcard Mask:   0.255.255.255
First Host:      10.0.0.1
Last Host:       10.255.255.254
Total Hosts:     16,777,216
Usable Hosts:    16,777,214
IP Class:        A
Network Type:    Private
Binary:          00001010.00000000.00000000.00000000

Error Handling

If the input is not valid CIDR notation, say so and provide the expected format (A.B.C.D/N).

If an octet exceeds 255 or the prefix exceeds 32, explain the validation error.

If the user provides an IP without a prefix (e.g. 192.168.1.1), ask for the prefix length or assume /32.

💡 Examples

Input: 192.168.1.0/24

Output:

CIDR Notation:   192.168.1.0/24
Network Address: 192.168.1.0
Broadcast:       192.168.1.255
Subnet Mask:     255.255.255.0
Wildcard Mask:   0.0.0.255
First Host:      192.168.1.1
Last Host:       192.168.1.254
Total Hosts:     256
Usable Hosts:    254
IP Class:        C
Network Type:    Private
Binary:          11000000.10101000.00000001.00000000

Input: 10.0.0.0/8

Output:

CIDR Notation:   10.0.0.0/8
Network Address: 10.0.0.0
Broadcast:       10.255.255.255
Subnet Mask:     255.0.0.0
Wildcard Mask:   0.255.255.255
First Host:      10.0.0.1
Last Host:       10.255.255.254
Total Hosts:     16,777,216
Usable Hosts:    16,777,214
IP Class:        A
Network Type:    Private
Binary:          00001010.00000000.00000000.00000000

⚙️ Configuration

Input is always a single CIDR string; no additional options.