---
title: "Lookup MaStR ID for a VNB (grid operator) using BDEW code"
method: POST
path: "/api/grid-operations/vnb-lookup"
tags: ["Grid Operations"]
---

# Lookup MaStR ID for a VNB (grid operator) using BDEW code

`POST /api/grid-operations/vnb-lookup`

## Request

- Base URL: `https://api.cernion.de`
- URL: `https://api.cernion.de/api/grid-operations/vnb-lookup`
- Auth: none declared

Resolve BDEW codes to MaStR Netzbetreiber IDs (SNB/GNB) for downstream grid-operator queries. If the primary lookup fails, an optional city param triggers a fallback that extracts the SNB from a sample installation in that city.

## Query parameters

- `token` string

## Request body

- object
  - `bdew` string: BDEW code
  - `limit` integer: Max market partner matches to consider
  - `city` string: Optional operator city (e.g. from marketPartners contacts). Used as fallback when cernion_vnb_lookup returns no result — extracts SNB from a sample installation in that city.
  - `token` string: Optional Cernion MCP token for this request. Overrides CERNION_TOKEN when provided.

## Response `200`

Successful response

- object

---

[API](https://skmtc.dev/cernion/apis/cernion-energy-tools-api.md) · [All operations](https://skmtc.dev/cernion/apis/cernion-energy-tools-api/llms.txt) · [OpenAPI document](https://skmtc.dev/cernion/apis/cernion-energy-tools-api/revisions/cdb94473b538?raw)