---
title: Email and domain allowlisting
description: To ensure employees can access Coderbyte and receive important communications, we recommend that your IT team allowlist the following email addresses and domains as part of your organization's onboarding process.
---

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# Email and domain allowlisting

## To ensure employees can access Coderbyte and receive important communications, we recommend that your IT team allowlist the following email addresses and domains as part of your organization's onboarding process.

Email allowlisting

Coderbyte sends account notifications, assessment invitations, and support communications from the following addresses:

| Email address | Purpose |
| --- | --- |
| `admin@coderbyte.com` | Account administration and notifications |
| `do-not-reply@coderbyte.com` | Automated emails and assessment invitations |
| `support@coderbyte.com` | Customer support communications |

Please ensure emails from these addresses can be delivered without being blocked or quarantined by your organization's email security systems.

### Network and domain allowlisting

Coderbyte relies on the following domains for its application, coding environments, real-time collaboration, and supporting services.

| Domain | Purpose |
| --- | --- |
| `coderbyte.com` | Main application and website |
| `cblab.app` | Hosted coding environments |
| `*.cblab.app` | Dynamically generated coding environments and project previews |
| `cbfe.app` | Supporting application functionality |
| `ai-streaming.coderbyte.com` | AI-powered functionality and streaming |
| `realtime-server.coderbyte.com` | Real-time collaboration and communication |
| `coderbytestaticimages.s3.amazonaws.com` | Static images and application assets |

### Network requirements

- **Protocols:** HTTPS and secure WebSocket (WSS)
- **Port:** TCP 443 (outbound)
- **Filtering:** Domain-based allowlisting is recommended over static IP allowlisting.
- **WebSockets:** Persistent WebSocket connections must be permitted for real-time functionality.
- **Wildcard domains:** Access to `*.cblab.app` is required because development environments may use dynamically generated subdomains.

Organizations using firewalls, proxies, secure web gateways, or SSL/TLS inspection should ensure these controls do not interrupt access to the listed domains or their required connections.

### Additional considerations

Some Coderbyte features, including video Interviews and proctoring, may require browser permissions for cameras, microphones, or screen sharing.

We recommend reviewing these requirements before employees begin using Coderbyte to avoid disruptions during Assessments and Interviews.

 

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