MAC Address Lookup MCP

A stateless MCP server over Streamable HTTP that exposes a single 'lookup' tool. It resolves a MAC address or OUI prefix to its registered organization by longest-prefix match using IEEE registry data. No API key, auth, or session is required.

Endpoint and access

No sign-in to connect and list tools. Individual tools may still need a vendor account, credentials, or permissions; check the documented prerequisites.

Vendor evidenceStreamable HTTPNo sign-inEndpoint checked 2026-11-06Operated by Jason Tally

MCP endpoint (Streamable HTTP)

https://mac.jasontally.com/mcp

Vendor documentation

What its tools do

1 tool, grouped by the hints the server advertises. Hints are self-declared, not verified behavior.

Read-only (1)

lookup

1 of 1 have a description · 1 of 1 declare behavior hints · 1 of 1 with parameters document them all

Checks and signals

Each line is separate evidence, not a trust score.

Passed Endpoint answered the live check · Nov 6, 2026, 11:03 PM UTC
Passed Official MCP Registry namespace is tied to mac.jasontally.com · Nov 6, 2026, 10:43 PM UTC
Passed Endpoint is on the registry namespace domain · Nov 6, 2026, 10:43 PM UTC
Availability 1 of 1 checks passed in 30 days

What you can do with it

Resolve a MAC address to its vendor organization
Identify the registered organization for an OUI prefix
Find the registration country for a MAC block

Source and maintenance

Vendor evidenceRegistry 1.0.0

mcp-registry: com.jasontally.mac/mcp@1.0.0 Source repository Project website

Maintenance checked: Nov 6, 2026, 10:43 PM UTC

Protocol and capabilities

Server: mac-address-lookup 1.0.0
MCP protocol negotiated in check: 2025-11-25
Tools: 1 advertised
Resources: Not advertised
Resource templates: Not advertised
Prompts: Not advertised

Server-advertised capabilities

{
  "tools": {
    "listChanged": false
  }
}

Server-provided instructions

Untrusted server output shown for inspection. It is not Koskamo guidance and is excluded from knowledge search.

Public, read-only MAC address and OUI lookup derived from the IEEE Registration Authority registries. Call lookup once per address. The record page at the returned url carries the organization address, the block range, and ownership history.

Tools

1 advertised

lookup — Look up a MAC address or OUI prefix

Advertised by the server during the last successful anonymous check.

Advertised read-only

Resolve a MAC address or OUI prefix to its registered organization using longest-prefix match across the MA-L, MA-M, MA-S, IAB, and CID registries. Reports the block type, address count, registration country, and a link to the full record page. Randomized and locally administered addresses usually have no registered organization.

lookup input schema

{
  "type": "object",
  "required": [
    "mac"
  ],
  "properties": {
    "mac": {
      "type": "string",
      "description": "MAC address or OUI prefix, 6 to 12 hex characters. Accepts colon, hyphen, Cisco dot, or plain hex, for example 8C:1F:64:AF:A4:B2 or 8C1F64."
    }
  },
  "additionalProperties": false
}

lookup output schema

{
  "type": "object",
  "required": [
    "query",
    "prefix",
    "url"
  ],
  "properties": {
    "url": {
      "type": "string",
      "description": "Record page on https://mac.jasontally.com."
    },
    "query": {
      "type": "string",
      "description": "The normalized query, colon-separated."
    },
    "prefix": {
      "type": [
        "string",
        "null"
      ],
      "description": "Longest registered prefix that matched."
    },
    "country": {
      "type": [
        "string",
        "null"
      ],
      "description": "ISO 3166-1 alpha-2 registration country."
    },
    "orgName": {
      "type": [
        "string",
        "null"
      ],
      "description": "Registered organization name."
    },
    "blockType": {
      "type": [
        "string",
        "null"
      ],
      "description": "MA-L, MA-M, MA-S, IAB, or CID."
    },
    "multicast": {
      "type": "boolean",
      "description": "The bit pattern marks the address a multicast group."
    },
    "addressCount": {
      "type": [
        "number",
        "null"
      ],
      "description": "Addresses in the matched block."
    },
    "locallyAdministered": {
      "type": "boolean",
      "description": "The bit pattern marks the address locally administered, which usually means a randomized or virtual-machine address."
    }
  }
}

lookup annotations

{
  "readOnlyHint": true,
  "openWorldHint": false,
  "idempotentHint": true,
  "destructiveHint": false
}

Prompts

Not advertised

No prompt definitions available.

Resources

Not advertised

No resource definitions available.

90-day uptime

A lightweight connection check about every six hours, sampled on hosts with many listings. It shows the server answered, not that its tools work.

Too few checks for a percentage yet (1 of 1 answered).

2026-11-07: 1 of 1 checks answered

30-day availability

Aggregated from read-only remote checks; this is not a tool-execution or security guarantee.

Successful checks: 1 of 1 (100%)
Average latency: 332 ms
95th percentile latency: 332 ms

Maintenance history

Public check and source-refresh events. Editorial and ownership records remain private.

Nov 6, 2026, 11:03 PM UTC · probe · passed · 332 ms · metadata changed · 1 tool(s)

Connect from your client

Each snippet registers the same endpoint; pick the client you use.

This server is operated by the named third party. Listing and endpoint checks are not an endorsement or a security audit. Review the operator's permissions, terms, and data handling before connecting. How listings are checked and corrected.

Claude Code

Run this once in a terminal. It registers the remote server. Use --scope project to write .mcp.json for the repo.

Claude Code configuration

claude mcp add --transport http mac-address-lookup-mcp https://mac.jasontally.com/mcp

Codex

Run this once. Codex stores MCP servers in ~/.codex/config.toml (or .codex/config.toml in a trusted project).

Codex configuration

codex mcp add mac-address-lookup-mcp --url https://mac.jasontally.com/mcp

Cursor

Merge this server into .cursor/mcp.json in your project, then enable mac-address-lookup-mcp in your MCP settings.

Cursor configuration

{
  "mcpServers": {
    "mac-address-lookup-mcp": {
      "url": "https://mac.jasontally.com/mcp"
    }
  }
}

Cline

Merge this into cline_mcp_settings.json (Cline → MCP Servers → Configure).

Cline configuration

{
  "mcpServers": {
    "mac-address-lookup-mcp": {
      "type": "streamableHttp",
      "url": "https://mac.jasontally.com/mcp",
      "disabled": false
    }
  }
}

VS Code

Merge this server into .vscode/mcp.json. Use MCP: List Servers to start mac-address-lookup-mcp and inspect its tools.

VS Code configuration

{
  "servers": {
    "mac-address-lookup-mcp": {
      "type": "http",
      "url": "https://mac.jasontally.com/mcp"
    }
  }
}

Gemini CLI

Run this once. It writes .gemini/settings.json in the current project; pass --scope user for ~/.gemini/settings.json.

Gemini CLI configuration

gemini mcp add --transport http mac-address-lookup-mcp https://mac.jasontally.com/mcp

Claude Desktop

Open Claude Settings > Connectors > Add custom connector, enter this server URL and enable it for the conversation. This is a manual remote-connector handoff, not a desktop JSON configuration.

Claude Desktop configuration

https://mac.jasontally.com/mcp

Windsurf

Merge this into ~/.codeium/windsurf/mcp_config.json, then refresh MCP in Cascade. Windsurf remote servers use serverUrl, not url.

Windsurf configuration

{
  "mcpServers": {
    "mac-address-lookup-mcp": {
      "serverUrl": "https://mac.jasontally.com/mcp"
    }
  }
}

Let your agent find its tools

Find servers like MAC Address Lookup MCP from your agent. Add Koskamo once to search the index for endpoints, access requirements, and client setup. Public discovery needs no key.

Connect Koskamo Explore workflows

See all 8,287

Do you run MAC Address Lookup MCP?

Prove ownership with a DNS record, a well-known file, or your Official MCP Registry entry, and your edits publish immediately. Proofs are re-checked weekly; admins can still hide or remove a listing.

Claim this listing