---
source_url: https://www.pubnub.com/docs/security/encryption/browser-connection-limits
title: Browser connection limits
description: Maximum concurrent connections browsers allow per host name, relevant when using a custom PubNub domain.
updated_at: 2026-09-30T07:20:08.000Z
---

# Browser connection limits

> For AI agents: documentation index at https://www.pubnub.com/llms-full.txt

Browsers cap the number of concurrent connections they open per host name. When you use a [custom PubNub domain](https://www.pubnub.com/docs/security/encryption/request-custom-domain.md), all PubNub traffic routes through that host name, so these limits apply directly to your app.

| Browser | Connections per host name | Max connections |
| --- | --- | --- |
| Chrome | 6 | 10 |
| Chrome mobile | 6 | 16 |
| Internet Explorer 9 | 6 | 35 |
| Internet Explorer Mobile 9 | 6 | 60 |
| Internet Explorer 10 | 8 | 17 |
| Internet Explorer 11 | 13 | 17 |
| Firefox | 6 | 17 |
| Safari | 6 | 17 |
| Android | 6 | 17 |

Last updated at: 2026-09-30T07:20:08.000Z