area-code

AreaCode.fyi MCP Server gives Claude, Cursor, and other MCP clients trusted North American phone-numbering context: area-code lookup, NANP phone-number…

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What it can do

  • Lookup Area Code: Look up a North American (NANP) area code: country, state/province, principal city and served cities, time zone, current local time, 10-digit-dialing flag, overlay codes, and nearby
  • Lookup Phone Number: Parse and validate a US/Canada (NANP) phone number. Returns whether the format is valid, the E.164 form, the area code, the likely region and time zone, and the current local time
  • Lookup Carrier: Look up the carrier, line type (wireless/landline), and rate center that a US/Canada number's NPA-NXX block was assigned to — covering nearly every active area code. Based on public bl

What data it sees

Do you need an account

No: the server works without sign-in

AreaCode.fyi MCP Server gives Claude, Cursor, and other MCP clients trusted North American phone-numbering context: area-code lookup, NANP phone-number validation, local time by area code, city/state/province coverage, overlays, scam/spoofing context, and block-allocation carrier metadata backed by areacode.fyi.

How to connect

How to connect area-code to Claude

The server address to paste into Claude settings:

https://area-code.run.tools

  1. Open Claude (claude.ai or the desktop app).
  2. Go to Settings → Connectors.
  3. Click Add custom connector.
  4. Paste the server address copied below into Remote MCP server URL and click Add.
  5. In a chat, click + → Connectors and switch the new connector on.

Custom connectors are available on Free, Pro, Max, Team and Enterprise plans (Free is limited to one). On Team and Enterprise an organization Owner adds the connector first under Organization settings → Connectors.

Authorization

After you click Add, a sign-in window for the service opens. Sign in with your own account and approve access. Claude never sees your password.

How to connect area-code to ChatGPT

The server address to paste into ChatGPT settings:

https://area-code.run.tools

  1. Open ChatGPT in a browser (chatgpt.com). A Plus, Pro, Business, Enterprise or Edu plan is required.
  2. Turn on developer mode once: Settings → Apps → Advanced settings → Developer mode.
  3. Open Settings → Connectors and click Create.
  4. Fill in the form: Name (anything), Description (one line about what the service does), MCP server URL (copy it below).
  5. Under Authentication choose OAuth if the service requires sign-in, otherwise None. Click Create.
  6. In a new chat open + → Apps/Connectors and enable the connector.

OpenAI has renamed this section before (Connectors → Apps/Plugins). If the label differs, search settings for "developer mode". On Business/Enterprise workspaces an admin must allow custom connectors first.

Authorization

On first use ChatGPT opens the service's sign-in window. Sign in and approve access.

How to connect area-code to Cursor

The server address to paste into Cursor settings:

https://area-code.run.tools

Fastest: click Open in Cursor below and confirm the prompt.

Manually:

  1. In Cursor open Settings → Cursor Settings → MCP and click Add new global MCP server.
  2. Paste the JSON copied below into ~/.cursor/mcp.json (per project: .cursor/mcp.json in the repo root).
  3. Save the file. The server appears in the MCP list; authorize it there if asked.

Authorization

If the service needs sign-in, an authorize button appears next to the server in the MCP list.

Server tool list (8)

Raw names from tools/list. Only developers need these.

lookup_area_codeLook up a North American (NANP) area code: country, state/province, principal city and served cities, time zone, current local time, 10-digit-dialing flag, overlay codes, and nearby codes. Returns a canonical areacode.fyi URL and the NANPA source date.
lookup_phone_numberParse and validate a US/Canada (NANP) phone number. Returns whether the format is valid, the E.164 form, the area code, the likely region and time zone, and the current local time there. Area-code level only — not the caller's identity, exact location, or live carrier; caller ID can be spoofed.
lookup_carrierLook up the carrier, line type (wireless/landline), and rate center that a US/Canada number's NPA-NXX block was assigned to — covering nearly every active area code. Based on public block-allocation data, NOT a live lookup: if the number was ported the current carrier differs. Not for caller identity, fraud, or FCRA decisions.
area_codes_for_cityList the area codes that serve a US or Canadian city. Optionally pass a state/province to disambiguate cities that share a name.
area_codes_for_stateList every area code in a US state or Canadian province.
is_scam_area_codeExplain whether an area code is associated with scams. An area code is never a scam by itself; this returns that context plus spoofing notes — caller ID can be faked, so judge calls by what they ask for, not the area code.
check_number_reputationReturn the UNVERIFIED, crowd-sourced community signal for a US/Canada number from areacode.fyi: 'low' (people have looked it up), 'mid'/'high' (it has user reports). Caller ID can be spoofed — this is never proof a specific number is fraudulent.
explain_area_code_topicSource-backed explanation of a phone-numbering topic, suitable for answering end users.