IPv6 address classify

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

Classify an IPv6 address against the static IANA IPv6 special-purpose address registry.

Use when you need to: ipv6 address classify · is ipv6 link local · ipv6 special purpose lookup.

Supported

• ipv6 address classify
• is ipv6 link local
• ipv6 special purpose lookup

Not supported

• IPv4
• routing-table-aware or organization-specific reservations
• live registry lookups

Behavior

• address accepts any RFC 4291 textual form (see ipv6-parse).
• classification is the single most-specific (longest-prefix) matching label from a fixed, embedded table of well-known IANA IPv6 special-purpose ranges; "global_unicast" if no entry matches.
• Labels: unspecified (::/128), loopback (::1/128), ipv4_mapped (::ffff:0:0/96), ipv4_ipv6_translation (64:ff9b::/96, NAT64 well-known prefix), documentation (2001:db8::/32), unique_local (fc00::/7), link_local (fe80::/10), multicast (ff00::/8), global_unicast (everything else).
• matched_range is the exact embedded CIDR entry that matched, or null when classification is "global_unicast".

Input

• address (string, required): max length 45

Output

• classification (one of "unspecified", "loopback", "ipv4_mapped", "ipv4_ipv6_translation", "documentation", "unique_local", "link_local", "multicast", "global_unicast", required)
• matched_range (string or null, required): max length 49

Limits

• max address length: 45

Example

Request input:

{
  "address": "fe80::1"
}

Response:

{
  "result": {
    "classification": "link_local",
    "matched_range": "fe80::/10"
  }
}

How to call it

MCP

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

{
  "id": "ipv6-address-classify",
  "version": "1.0.0",
  "input": {
    "address": "fe80::1"
  }
}

HTTP (no key)

curl -X POST https://computefirst.net/v1/tools/ipv6-address-classify/versions/1.0.0/execute \
  -H "Content-Type: application/json" \
  -d '{"address":"fe80::1"}'

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

CLI

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

Get the client at /clients/cli/.

Related tools

• IPv4 address classify: Classify an IPv4 address against the static IANA IPv4 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 normalize: Normalize any valid textual IPv6 address directly into its RFC 5952 canonical compressed string.