STUN and TURN Service
Dolby operates STUN and TURN servers as part of the Millicast service to provide customers with a robust way to traverse NAT and firewalls for successful connections.
What is STUN and TURN?
STUN and TURN servers are a critical part of WebRTC communication to allow users to connect and view streams. They are IETF standard protocols for negotiating traversing Network Address Translation (NATs) when establishing communication sessions.
Session Traversal Utilities for NAT (STUN) is used for servers and clients to discover their public IP address when they are located behind a NAT/Firewall. When this host wants to receive an incoming connection, it provides this public IP address as a possible location where it can receive a connection. Suppose the NAT/Firewall still won't allow the viewer and media server to connect directly. In that case, the two make a connection to the Traversal Using Relay around NAT (TURN) service, which will relay media between the two parties.
What do I need to do?
Customers don't need to do anything by default to utilize this service. When TURN is required to relay media, the service and the video player client will negotiate automatically. In some restrictive environments, customers may be required to add allow rules so their web clients can reach the TURN servers. IP addresses for this are listed below.
IP Addresses for STUN/TURN
Millicast has the following regional IP addresses for our STUN/TURN. IP addresses were last updated 2024-11-04.
| Dolby Region | API ID | IP Range Information |
|---|---|---|
| Bangalore, India | blr-1 | 139.59.49.50 139.59.49.86 64.225.87.21 64.225.87.66 64.225.87.164 174.138.120.21 68.183.247.136 139.59.49.159 |
| Ashburn, VA, USA | iad-1 | 129.213.172.222 141.148.39.122 193.122.165.132 129.80.107.22 129.80.49.52 141.148.63.222 150.230.164.20 150.136.130.194 |
| Frankfurt, Germany | fra-1 | 141.144.229.61 89.168.103.9 144.24.168.81 141.147.50.224 144.24.169.241 130.162.224.118 129.159.200.0 130.162.224.21 |
| London, UK | lon-1 | 132.226.128.169 84.8.154.194 150.230.127.97 79.72.91.241 141.147.64.72 141.147.113.177 150.230.118.111 141.147.96.45 |
| Phoenix, AZ, USA | phx-1 | 129.153.95.186 129.146.214.35 129.153.84.129 141.148.160.171 129.153.216.166 144.24.9.249 152.70.155.112 129.146.10.49 |
| São Paulo, Brazil | sao-1 | 136.248.75.56 168.138.254.134 136.248.109.105 167.234.230.239 136.248.127.209 144.22.189.247 136.248.68.90 150.230.78.100 |
| Singapore | sgp-1 | 146.190.195.233 146.190.200.127 146.190.200.155 144.126.241.168 139.59.220.163 157.230.192.175 139.59.192.127 139.59.192.132 |
| Sydney, Australia | syd-1 | 192.9.182.131 192.9.177.241 192.9.181.7 192.9.176.25 159.13.38.8 159.13.55.70 158.178.143.49 152.69.174.63 |
Also, make sure to open up the following network ports detailed in our Platform Requirements page.
In rare cases, Millicast may occasionally use Twilio's service. See here for Twilio's IP list for a detailed IP range for STUN/TURN servers.
Updated 16 days ago