IPv4 CIDR aggregate

ipv4-cidr-aggregate · version 1.0.0 · URLs & IP addresses · free, no key needed

Merge a list of IPv4 CIDR blocks into the minimal equivalent list of non-overlapping CIDR blocks.

Use when you need to: ipv4 cidr aggregate · summarize ipv4 cidr list · collapse ipv4 subnets.

Supported

• ipv4 cidr aggregate
• summarize ipv4 cidr list
• collapse ipv4 subnets
• ipv4 cidr supernet merge

Not supported

• IPv6
• preserving input order or duplicate entries

Behavior

• cidrs is a non-empty array of at most 512 dotted-decimal/prefix strings, each with host bits zero.
• Overlapping and directly adjacent blocks are merged; a block fully covered by another is absorbed into it.
• aggregated is the minimal ordered (ascending network address) list of CIDR blocks whose union equals the union of the input blocks.
• Throws if the result would exceed 4096 blocks.

Input

• cidrs (array of string, required): min items 1; max items 512; each max length 18

Output

• aggregated (array of string, required): max items 4096; each max length 18
• count (integer, required): min 1; max 4096

Limits

• max cidr length: 18
• max input cidrs: 512
• max output blocks: 4096

Example

Request input:

{
  "cidrs": [
    "10.0.0.0/25",
    "10.0.0.128/25",
    "10.0.2.0/24"
  ]
}

Response:

{
  "result": {
    "aggregated": [
      "10.0.0.0/24",
      "10.0.2.0/24"
    ],
    "count": 2
  }
}

How to call it

MCP

Connect https://computefirst.net/mcp (setup), then call execute with:

{
  "id": "ipv4-cidr-aggregate",
  "version": "1.0.0",
  "input": {
    "cidrs": [
      "10.0.0.0/25",
      "10.0.0.128/25",
      "10.0.2.0/24"
    ]
  }
}

HTTP (no key)

curl -X POST https://computefirst.net/v1/tools/ipv4-cidr-aggregate/versions/1.0.0/execute \
  -H "Content-Type: application/json" \
  -d '{"cidrs":["10.0.0.0/25","10.0.0.128/25","10.0.2.0/24"]}'

The machine-readable contract is at /v1/tools/ipv4-cidr-aggregate/versions/1.0.0.

CLI

node cli.mjs run ipv4-cidr-aggregate 1.0.0 --input input.json --base-url https://computefirst.net

Get the client at /clients/cli/.

Related tools

• IPv6 CIDR aggregate: Merge a list of IPv6 CIDR blocks into the minimal equivalent list of non-overlapping CIDR blocks.
• IPv4 CIDR subnets: Split an IPv4 CIDR block into the full ordered list of equal-size subnets at a given longer prefix.
• IPv4 range to cidrs: Convert an arbitrary IPv4 address range into the minimal list of CIDR blocks that exactly covers it.
• IPv4 CIDR contains: Test whether one IPv4 CIDR block fully contains another IPv4 CIDR block.
• IPv4 CIDR overlap: Test whether two IPv4 CIDR blocks overlap (share at least one address).
• IPv4 CIDR parse: Parse an IPv4 CIDR block into its network, broadcast, netmask, wildcard mask, usable host range and address counts.