IPv6 normalize

ipv6-normalize · version 1.0.0 · URLs & IP addresses · free, no key needed

Normalize any valid textual IPv6 address directly into its RFC 5952 canonical compressed string.

Use when you need to: ipv6 normalize · canonicalize ipv6 address · ipv6 compress.

Supported

• ipv6 normalize
• canonicalize ipv6 address
• ipv6 compress

Not supported

• zone/scope IDs
• preserving an IPv4-embedded tail in the output (it is rendered in hex)

Behavior

• address accepts any RFC 4291 textual form, exactly as ipv6-parse does.
• address (output) is the RFC 5952 canonical string: lowercase hex, no leading zeros per group, and the leftmost longest run of two or more all-zero groups compressed once as "::".
• Equivalent to ipv6-format(ipv6-parse(address).hextets) in one call.

Input

• address (string, required): max length 45

Output

• address (string, required): max length 45

Limits

• max address length: 45

Example

Request input:

{
  "address": "2001:0DB8:0000:0000:0000:0000:0000:0001"
}

Response:

{
  "result": {
    "address": "2001:db8::1"
  }
}

How to call it

MCP

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

{
  "id": "ipv6-normalize",
  "version": "1.0.0",
  "input": {
    "address": "2001:0DB8:0000:0000:0000:0000:0000:0001"
  }
}

HTTP (no key)

curl -X POST https://computefirst.net/v1/tools/ipv6-normalize/versions/1.0.0/execute \
  -H "Content-Type: application/json" \
  -d '{"address":"2001:0DB8:0000:0000:0000:0000:0000:0001"}'

The machine-readable contract is at /v1/tools/ipv6-normalize/versions/1.0.0.

CLI

node cli.mjs run ipv6-normalize 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.
• IPv6 address compare: Compare two IPv6 addresses by their numeric 128-bit value.
• IPv6 address distance: Compute the signed integer distance between two IPv6 addresses (address_b minus address_a).
• IPv6 address offset: Add a signed integer offset to an IPv6 address, throwing if the result leaves the IPv6 address space.
• IPv6 in CIDR: Test whether an IPv6 address lies in a CIDR prefix whose host bits are zero.
• IPv6 parse: Parse an IPv6 address (any RFC 4291 textual form) into its 8 hextets and a 128-bit integer string.