IPv4 address classify

ipv4-address-classify · version 1.0.0 · URLs & IP addresses · free, no key needed

Classify an IPv4 address against the static IANA IPv4 special-purpose address registry.

Use when you need to: ipv4 address classify · is ipv4 private · ipv4 special purpose lookup.

Supported

• ipv4 address classify
• is ipv4 private
• ipv4 special purpose lookup

Not supported

• IPv6
• routing-table-aware or organization-specific reservations
• live registry lookups

Behavior

• address is a canonical dotted-decimal IPv4 address.
• classification is the single most-specific (longest-prefix) matching label from a fixed, embedded table of well-known IANA IPv4 special-purpose ranges; "public" if no entry matches.
• Labels: this_network (0.0.0.0/8), private (RFC 1918), shared_address_space (100.64.0.0/10), loopback (127.0.0.0/8), link_local (169.254.0.0/16), reserved (192.0.0.0/24, 192.88.99.0/24, 240.0.0.0/4), documentation (TEST-NET-1/2/3), benchmarking (198.18.0.0/15), multicast (224.0.0.0/4), broadcast (255.255.255.255/32), public (everything else).
• matched_range is the exact embedded CIDR entry that matched, or null when classification is "public".

Input

• address (string, required): max length 15; pattern ^(?:0|[1-9][0-9]{0,2})(?:\.(?:0|[1-9][0-9]{0,2})){3}$

Output

• classification (one of "this_network", "private", "shared_address_space", "loopback", "link_local", "reserved", "documentation", "benchmarking", "multicast", "broadcast", "public", required)
• matched_range (string or null, required): max length 18

Limits

• Request body up to 256 KiB

Example

Request input:

{
  "address": "192.168.1.1"
}

Response:

{
  "result": {
    "classification": "private",
    "matched_range": "192.168.0.0/16"
  }
}

How to call it

MCP

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

{
  "id": "ipv4-address-classify",
  "version": "1.0.0",
  "input": {
    "address": "192.168.1.1"
  }
}

HTTP (no key)

curl -X POST https://computefirst.net/v1/tools/ipv4-address-classify/versions/1.0.0/execute \
  -H "Content-Type: application/json" \
  -d '{"address":"192.168.1.1"}'

The machine-readable contract is at /v1/tools/ipv4-address-classify/versions/1.0.0.

CLI

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

Get the client at /clients/cli/.

Related tools

• IPv6 address classify: Classify an IPv6 address against the static IANA IPv6 special-purpose address registry.
• IPv4 address compare: Compare two canonical IPv4 addresses by their numeric uint32 value.
• IPv4 address distance: Compute the signed integer distance between two IPv4 addresses (address_b minus address_a).
• IPv4 address offset: Add a signed integer offset to an IPv4 address, throwing if the result leaves the IPv4 address space.
• IPv4 in CIDR: Test whether a canonical IPv4 address lies in a CIDR prefix whose host bits are zero.
• IPv4 range to cidrs: Convert an arbitrary IPv4 address range into the minimal list of CIDR blocks that exactly covers it.