IPv6 format

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

Format 8 hextets or a 128-bit integer string as the RFC 5952 canonical compressed IPv6 address.

Use when you need to: ipv6 format · format ipv6 canonical · hextets or integer to ipv6.

Supported

• ipv6 format
• format ipv6 canonical
• hextets or integer to ipv6

Not supported

• IPv4-embedded output form
• zone/scope IDs

Behavior

• Input is exactly one of hextets or integer; unknown fields, both, or neither throw.
• hextets is an array of exactly 8 JSON integers 0-65535.
• integer is a canonical decimal string n with 0 <= n <= 340282366920938463463374607431768211455.
• address is the RFC 5952 canonical form: lowercase hex, no leading zeros per group, and the leftmost longest run of two or more all-zero groups compressed once as "::" (no run under length 2 is compressed).
• ipv6-format(ipv6-parse(a)) yields the canonical form of a for every valid IPv6 address a.

Input

• object

Output

• address (string, required): max length 45

Limits

• integer max: 340282366920938463463374607431768211455
• hextet count: 8

Example

Request input:

{
  "hextets": [
    8193,
    3512,
    0,
    0,
    0,
    0,
    0,
    1
  ]
}

Response:

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

How to call it

MCP

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

{
  "id": "ipv6-format",
  "version": "1.0.0",
  "input": {
    "hextets": [
      8193,
      3512,
      0,
      0,
      0,
      0,
      0,
      1
    ]
  }
}

HTTP (no key)

curl -X POST https://computefirst.net/v1/tools/ipv6-format/versions/1.0.0/execute \
  -H "Content-Type: application/json" \
  -d '{"hextets":[8193,3512,0,0,0,0,0,1]}'

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

CLI

node cli.mjs run ipv6-format 1.0.0 --input input.json --base-url https://computefirst.net

Get the client at /clients/cli/.

Related tools

• IPv6 parse: Parse an IPv6 address (any RFC 4291 textual form) into its 8 hextets and a 128-bit integer string.
• IPv4 format: Format a uint32 integer string or four octets as a canonical dotted-decimal IPv4 address.
• IPv6 address offset: Add a signed integer offset to an IPv6 address, throwing if the result leaves the IPv6 address space.
• IPv6 CIDR parse: Parse an IPv6 CIDR block into its canonical network address, prefix, first/last address, and total address count.
• IPv6 IPv4 mapped: Convert between an IPv4 address and its IPv4-mapped IPv6 form (::ffff:0:0/96), in either direction.
• IPv6 range to cidrs: Convert an arbitrary IPv6 address range into the minimal list of CIDR blocks that exactly covers it.