PESEL/NIP/REGON Validator MCP Server

by apished Your server? Claim it

answering

PESEL/NIP/REGON Validator is answering right now. Last checked 14 min ago. It exposes 3 tools.

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

Uptime history 60 days of history · worst day 0%

60 days agonow

100.0%

Uptime 24h

91 of 91 checks

Tools

read from the server

164 ms

Response time

average over 24h

open, no key

Access

streamable-http

PESEL/NIP/REGON Validator does not always answer

Over the last week it answered 48.3% of our checks. We check every 15 minutes, so you hear about the next outage within the hour — not from your users.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 14 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	152 ms	14 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 91 of 91 checks got a reply (100.0%), average response time 164 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 164 ms on average, which is faster than 71% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.