PESEL/NIP/REGON Validator MCP Server

by apished Your server? Claim it

answering

PESEL/NIP/REGON Validator is answering right now. Last checked moments ago. It exposes 3 tools.

Validates Polish PESEL, NIP, and REGON checksums; PESEL also decodes birth date and sex.

Uptime history 14 days of history

14 days agonow

100.0%

Uptime 24h

92 of 92 checks

Tools

read from the server

180 ms

Response time

average over 24h

open, no key

Access

streamable-http

Nothing serious here today

Today is the operative word: we check PESEL/NIP/REGON Validator every 15 minutes and re-read its code on every release. Watch it and you find out the day that stops being true.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 0 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add pesel-nip-regon-validator --transport http https://apished.com/mcp/v1/idvalidate

~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "pesel-nip-regon-validator": {
      "url": "https://apished.com/mcp/v1/idvalidate"
    }
  }
}

~/.codex/config.toml

[mcp_servers.pesel-nip-regon-validator]
url = "https://apished.com/mcp/v1/idvalidate"

.cursor/mcp.json

{
  "mcpServers": {
    "pesel-nip-regon-validator": {
      "url": "https://apished.com/mcp/v1/idvalidate"
    }
  }
}

.vscode/mcp.json

{
  "mcpServers": {
    "pesel-nip-regon-validator": {
      "url": "https://apished.com/mcp/v1/idvalidate"
    }
  }
}

Available tools 3

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

nip

nip_validate

Validates the checksum of a 10-digit Polish tax identification number (NIP). Checksum uses weights 6 5 7 2 3 4 5 6 7 over the first 9 digits; sum mod 11 must equal the 10th digit. A sum mod 11 of 10 is itself invalid.

pesel

pesel_validate

Validates the checksum of an 11-digit Polish national identification number (PESEL). Checksum uses weights 1 3 7 9 1 3 7 9 1 3 over the first 10 digits; control digit is (10 - sum mod 10) mod 10. On success also decodes the date of birth and sex embedded in the number; a checksum-valid number with an impossible calendar date (e.g. Feb 30) is still reported invalid.

regon

regon_validate

Validates the checksum of a 9- or 14-digit Polish business registry number (REGON). 9-digit: weights 8 9 2 3 4 5 6 7 over the first 8 digits, sum mod 11 (10 mapped to 0) must equal the 9th digit. 14-digit: the first 9 digits must themselves be a valid 9-digit REGON, and weights 2 4 8 5 0 9 7 3 6 1 2 4 8 over the first 13 digits (sum mod 11, 10 mapped to 0) must equal the 14th digit.

Endpoints

URL	Transport	State	Latency	Checked
https://apished.com/mcp/v1/idvalidate	streamable-http	answering	192 ms	0 min ago

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PESEL/NIP/REGON Validator — questions

Answers built from our own checks of this server.

What can PESEL/NIP/REGON Validator do?

It exposes 3 tools, read directly from the server on our last check. Among them: nip_validate, pesel_validate, regon_validate. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →

Is PESEL/NIP/REGON Validator working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 92 of 92 checks got a reply (100.0%), average response time 180 ms. The bar chart above shows every period we have measured.

How do I connect PESEL/NIP/REGON Validator?

Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.

Does PESEL/NIP/REGON Validator need an API key?

No. PESEL/NIP/REGON Validator completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 3 of them are readable on this page. This is what we observed, not what the docs claim.

How fast is PESEL/NIP/REGON Validator?

It answers our handshake in 180 ms on average, which is faster than 75% of all working MCP servers we measure. That puts it in the quick quarter of the ecosystem. The comparison comes from our own checks across the whole registry, every 15 minutes.