# Network Requirements \$1 Real-Time Streaming
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Amazon IVS real-time streaming relies on WebRTC and WebSocket protocols for the transmission of media and data. To ensure a seamless experience, the destinations and ports listed below must be accessible. Any restrictions on inbound or outbound traffic to these destinations may disrupt the functionality of IVS real-time streaming.

You can use this [network test tool](https://diagnostics.ivs.rocks/) to ensure that your network is properly configured and that traffic to and from the necessary destinations and ports is not being blocked.

## Common
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| Destination | Ports | 
| --- | --- | 
|  \$1.live-video.net  |  TCP:443  | 

## Media
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By default, IVS real-time streaming relies on UDP for the transmission of media to ensure low-latency and high-performance streaming. If UDP is blocked for participants subscribing to media, TCP is used as a fallback. TCP fallback is not supported for publishing, so if UDP traffic is completely blocked, publishing will fail.


| Destination | Ports | 
| --- | --- | 
|  All subnets listed under the `IVS_REALTIME` service in [ip-ranges.json](https://docs.aws.amazon.com//vpc/latest/userguide/aws-ip-ranges.html) must be accessible, regardless of their `region` or your chosen AWS Region. Participants may be connected to any subnet automatically. See [Global Solution, Regional Control](what-is.md) for details.  |  UDP:3478 UDP:443 TCP:3478 (Fallback) TCP:443  |