# Saylor Innovations CIDR Subnet Calculator

> Saylor Innovations CIDR Subnet Calculator is a paid API for AI agents from saylorinnovations.com, paid per call via x402, $0.01/call, status unknown (last checked 2026-10-17).

Calculates network, broadcast, netmask, wildcard, host range, and usable hosts for a given IPv4 CIDR block

## Facts

- Endpoint: GET https://saylorinnovations.com/api/net/cidr?utm_source=zero.xyz
- Price: $0.01/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-17
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/saylor-innovations-cidr-subnet-calculator-4b619011
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_FJ_QhJ65YWQCpRxq4mGNq

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability saylor-innovations-cidr-subnet-calculator-4b619011
```

Example prompt: What are all the subnet details for 192.168.1.0/24 — give me the network address, broadcast, netmask, wildcard, usable host range, and how many hosts I can use?

## When to prefer this

Use this endpoint when you need fast, authoritative IPv4 subnet calculations from a single CIDR notation input and want a structured JSON response covering all standard subnet attributes in one call — especially in automated network provisioning, validation, or documentation workflows. Prefer this over manual calculation libraries when operating in an agent context that requires an external computation call with a consistent API contract.

## Known failure modes

- Missing or malformed 'cidr' query parameter returns an error
- Invalid CIDR notation (e.g. missing prefix length or out-of-range values) returns an error
- Host bits set in the address (e.g. 192.168.1.5/24 instead of 192.168.1.0/24) may return unexpected results or an error
- Network unreachable or service downtime returns a non-200 HTTP response

## How this service works

CIDR subnet calculator - network, broadcast, netmask, wildcard, host range and usable hosts for an IPv4 CIDR block

## Output

Returns a JSON object with the network address, broadcast address, netmask, wildcard mask, first usable host, last usable host, total addresses, usable host count, address class, whether the block is RFC1918 private, the original CIDR input, and a timestamp of when the check was run.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "$schema": "https://json-schema.org/draft/2020-12/schema",
 "required": [
  "input"
 ],
 "properties": {
  "input": {
   "type": "object",
   "required": [
    "type",
    "method"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "http"
    },
    "method": {
     "enum": [
      "GET"
     ],
     "type": "string"
    },
    "queryParams": {
     "type": "object",
     "required": [
      "cidr"
     ],
     "properties": {
      "cidr": {
       "type": "string",
       "description": "IPv4 CIDR, e.g. 192.168.1.0/24"
      }
     }
    }
   },
   "additionalProperties": false
  },
  "output": {
   "type": "object",
   "required": [
    "type"
   ],
   "properties": {
    "type": {
     "type": "string",
     "const": "json"
    },
    "example": {
     "type": "object",
     "required": [
      "network",
      "netmask",
      "usable_hosts"
     ],
     "properties": {
      "cidr": {
       "type": "string",
       "description": "CIDR block"
      },
      "netmask": {
       "type": "string"
      },
      "network": {
       "type": "string",
       "description": "Network name"
      },
      "wildcard": {
       "type": "string"
      },
      "broadcast": {
       "type": [
        "string",
        "null"
       ]
      },
      "last_host": {
       "type": "string",
       "description": "Last host"
      },
      "checked_at": {
       "type": [
        "string",
        "null"
       ],
       "description": "Time the check was run (UTC)"
      },
      "first_host": {
       "type": "string",
       "description": "First host"
      },
      "usable_hosts": {
       "type": "number",
       "description": "Usable hosts"
      },
      "address_class": {
       "type": [
        "string",
        "null"
       ],
       "description": "Address class"
      },
      "input_address": {
       "type": [
        "string",
        "null"
       ],
       "description": "Input address"
      },
      "total_addresses": {
       "type": "number",
       "description": "Total addresses"
      },
      "is_private_rfc1918": {
       "type": "boolean",
       "description": "True when this is private rfc1918"
      }
     }
    }
   }
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/saylor-innovations-cidr-subnet-calculator-4b619011/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from saylorinnovations.com](https://www.zero.xyz/host/saylorinnovations.com/llms.txt)