---
title: Metro code field now available in Rules
description: The ip.src.metro_code field is now populated with DMA (Designated Market Area) data for IP geolocation.
image: https://developers.cloudflare.com/changelog-preview.png
---

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## Metro code field now available in Rules

Jan 12, 2026 

[ Rules ](https://developers.cloudflare.com/rules/) 

The `ip.src.metro_code` field in the Ruleset Engine is now populated with DMA (Designated Market Area) data.

You can use this field to build rules that target traffic based on geographic market areas, enabling more granular location-based policies for your applications.

#### Field details

| Field              | Type           | Description                                                                                                                   |
| ------------------ | -------------- | ----------------------------------------------------------------------------------------------------------------------------- |
| ip.src.metro\_code | String \| null | The metro code (DMA) of the incoming request's IP address. Returns the designated market area code for the client's location. |

Example filter expression:

```plaintext
ip.src.metro_code eq "501"
```

For more information, refer to the [Fields reference](https://developers.cloudflare.com/ruleset-engine/rules-language/fields/reference/ip.src.metro%5Fcode/).

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```