---
title: E-C-O™ Registry — Look up an E-C-O Number
---

E·C·O™ Registry

[Look up](https://www.viroway.com/eco-number#lookup) [The number](https://www.viroway.com/eco-number#anatomy) [How it works](https://www.viroway.com/eco-number#how) [For platforms](https://www.viroway.com/eco-number#platforms) [FAQ](https://www.viroway.com/eco-number#faq)

[Register an entity](https://www.viroway.com/eco-number#register)

E-C-O™ Number Registry

# Verify a company's ESG standing

Look up any E-C-O™ Number to see verified sustainability credentials — free, public, and current.

Look up

Or search by company name or organization number.

Try:

ECO-196-772-455-018-51

Nordmark Gruppen

a lapsed record

org no. 987 654 321

Anatomy of the number

## Seventeen characters, built to be checked

Hover over each part. The structure is fixed, public, and simple enough to validate offline — no account, no API call.

ECO 196 123·456·789 68

ECOScheme

Marks the identifier as an E-C-O Number — never reused for any other scheme.

3Registry series

The issuing series. Series 196 is the founding series; new series open as the registry grows.

9Entity sequence

A neutral sequence assigned at issuance. It encodes nothing about the entity — no country, size or sector — so the number never becomes outdated.

2Check digits

ISO 7064 MOD 97-10 over the twelve digits. Any system can catch a typo or forgery in one calculation.

How a number is issued

## Verified once. Valid for life.

An E-C-O Number is issued to a legal entity exactly once — and stays with it through renames, relocations and reorganisations.

1

### Apply

The entity — or a platform acting on its behalf — submits its legal identity: name, registration number, jurisdiction and authorised contact.

~10 minutes · no cost to suppliers invited by a customer

2

### Verify

Identity is confirmed against official business registers through independent know-your-business verification before anything is issued.

KYB screening · typically 1–2 business days

3

### Issued, permanently

The number enters the public registry. Re-verification keeps the record current — the number itself never changes and is never reassigned.

annual re-verification · full audit trail

Principles

## Rules the registry will not break

### One per entity

A legal entity holds exactly one E-C-O Number. Duplicates are merged, never issued.

### Permanent

Numbers are never recycled or reassigned — even if an entity is dissolved, its record is preserved.

### Portable

The number belongs to the entity, not to any platform. It moves wherever the entity's data goes.

### Free to verify

Looking up a number and validating its check digits is free for everyone, forever.

For platforms & developers

## Resolve identity in one call — or none

ESG platforms, procurement systems and registries use the E-C-O Number as a common key, so a supplier verified once is recognised everywhere.

- Validate check digits offline — no request needed
- Resolve public records over a simple REST API
- Subscribe to verification-status changes
- Fair-use free tier for lookups

# Validate locally — ISO 7064 MOD 97-10

valid = (int(digits12 + check2) % 97) == 1

 

# Resolve the public record

GET https://api.eco-numbers.com/v1/entities/ECO-196-123-456-789-68

 

{ "legal\_name": "Nordmark Gruppen AS",

  "status": "verified",

  "jurisdiction": "NO",

  "last\_verified": "2026-05-11" }

12,480

Entities registered

38

Jurisdictions

96.2%

Re-verified on time

0

Numbers ever reassigned

Questions

## Short answers to common ones

Is the E-C-O Number the same as an LEI or a DUNS number?

No — it complements them. LEI identifies entities for financial transactions; DUNS is a commercial identifier. The E-C-O Number anchors an entity's **ESG record**: its verified sustainability data, wherever that data lives. Records can cross-reference an entity's LEI where one exists.

What is publicly visible about a registered entity?

Only identity and status: legal name, jurisdiction, verification status and dates. An entity's actual ESG data is never published here — it stays on the platforms the entity chooses, shared on its own terms. The number is the key, not the vault.

What happens if a company changes its name or is acquired?

The number stays. Renames update the record; mergers follow published succession rules with the full history preserved. Continuity is the point — an ESG track record should survive corporate events.

Who operates the registry?

The registry is operated under a published charter with independent verification partners, and its validation scheme is open. Any platform — not only the registry's operators — can build on it.

## Give your entity its permanent ESG identity

Registration takes minutes. Verification is independent. The number is yours for good.

Register an entity [Look up a number](https://www.viroway.com/eco-number#lookup)

© 2026 E-C-O™ Registry · eco-numbers.com

CharterAPI docsStatusPrivacyContact