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Check a Leitweg-ID

Check the format and check digits of a German Leitweg-ID in your browser, and see whether it is registered to receive invoices on Peppol.

A Leitweg-ID such as 04011000-1234512345-06 is checked on your device first, then looked up on Peppol.

This check tells you in seconds whether a German Leitweg-ID is built correctly and its check digits match, and whether it is registered to receive invoices on Peppol. Klarbon checks the format and check digits on your device, to KoSIT's specification, and only looks up a valid ID on Peppol. There is no public directory of Leitweg-IDs.

How do I check a Leitweg-ID?

  1. Keep Germany selected and enter the Leitweg-ID with its hyphens, such as the specification's example 04011000-1234512345-06.
  2. Read the check. If the structure or check digits are wrong, Klarbon says so at once, without a lookup. A typing error shows up before the invoice is rejected.
  3. Read the Peppol answer. If the ID is valid, Klarbon asks the Peppol network under scheme 0204 and shows whether the body receives invoices there.

What is checked?

Part Rule (KoSIT 2.0.2, German)
Coarse address 2 to 12 digits; the first two name the federal state (01 to 16) or the federal level (99)
Fine address optional, up to 30 letters or digits
Check digits 2 digits by ISO/IEC 7064 MOD 97-10, calculated from the other two parts

Klarbon writes lower-case letters in the fine address as capitals, as they are registered. What a Leitweg-ID is and where it goes in an XRechnung is explained in What is a Leitweg-ID?

Where do I get the right Leitweg-ID?

From the public buyer. The federal portal E-Rechnung Bund says the Leitweg-ID is given to you with the order, and that its list of connected buyers does not replace agreeing the Leitweg-ID with them (E-Rechnung Bund, German). Valid check digits only show that the ID is well formed, not that it belongs to your buyer.

Leitweg-ID and Peppol

The Leitweg-ID has been registered as identification scheme 0204 since 2019 and can serve as a Peppol ID. KoSIT notes that a receiver's Peppol ID need not match its Leitweg-ID; the receiver usually tells you its Peppol ID when it uses Peppol. If Klarbon does not find the ID on Peppol, the Leitweg-ID is not wrong because of that. For business customers, look up their VAT number in the Peppol lookup.

What happens to the Leitweg-ID?

The format and check digits are checked on your device only. For the Peppol lookup, the ID goes to Klarbon's servers, which ask the public Peppol records; it is not kept. See what happens to your files.

Frequently asked questions

How do I check whether a Leitweg-ID is valid?

Enter it above. Klarbon checks on your device that it has a coarse address, an optional fine address and check digits, and recalculates the check digits with ISO/IEC 7064 MOD 97-10. Only the public body can confirm that it uses the ID.

Where do I find a public body's Leitweg-ID?

The public body gives it to you, usually with the order. There is no public directory of Leitweg-IDs. The federal invoice portal lists the public buyers connected to it, but says this does not replace agreeing the Leitweg-ID with the buyer.

Is a Leitweg-ID also a Peppol ID?

It can be. The Leitweg-ID is registered as scheme 0204. KoSIT notes that a receiver's Peppol ID need not match the Leitweg-ID on the invoice; the receiver usually gives it to you with the order.

What if the Leitweg-ID is not registered on Peppol?

It only means no receiver is registered under 0204 and that ID right now. The invoice can still be right, for example if the body receives through an invoice portal or uses another Peppol ID. The Leitweg-ID still goes in the buyer reference (BT-10).

Is the check free?

Yes. The format and check-digit check runs on your device and is not counted. For the Peppol lookup that follows, you have 100 lookups a day without an account and 500 lookups a day signed in.

Sources

Updated 8 November 2026