# ias-or

> ias-or is an Integral Ad Science verification crawler (Oregon region), in the same family as ias-va and ias-ie. It fetches publisher content for ad verification and brand-safety scoring.

Source: https://docs.centinelanalytica.com/crawlers/ias-or

## At a glance

- Operator: Integral Ad Science
- Type: Advertising

## How Centinel checks it

- **User agent**: The request calls itself this crawler. Anyone can send the same string.
- **IP ranges**: The operator publishes the addresses it crawls from, and Centinel checks the client address against that list.

A request that passes one of these checks is ias-or itself. One that only matches the user agent is reported as unverified. The match tokens, verification domains, and address feeds are not published here.

## Allowing or blocking it

The [crawler object](https://docs.centinelanalytica.com/api/crawlers.md) in the `/validate` response sets `access_allowed` to `true` only for a verified source that your tenant allowlists. A [policy rule](https://docs.centinelanalytica.com/admin/policy.md) can allow or block this crawler by its category, `Advertising`.

[Back to the crawler catalog](https://docs.centinelanalytica.com/concepts/crawler-catalog.md)

[Crawlers with a source check](https://docs.centinelanalytica.com/crawlers.md)