If you use a Firewall
The URLs or IP addresses listed here may change without prior notice. Please review this page periodically to ensure that the URLs and IPs match those permitted in your system.
To ensure full access to the app and to meet the security requirements, the following IP addresses/domains should be permitted in the firewall:
IP address allowlist
| Cluster | Addresses | Ports |
| All | 51.116.174.74 4.184.99.71 20.52.217.177 |
TCP: 443, 80 UDP: 443 |
| EU | 20.113.162.111 | TCP: 443, 80 UDP: 443 |
| AU | 13.73.196.104 | TCP: 443, 80 UDP: 443 |
| US | 52.165.41.163 | TCP: 443, 80 UDP: 443 |
| Testing | 20.170.3.149 | TCP: 443, 80 UDP: 443 |
| Video Conferencing | 142.132.155.149 2a01:4f8:261:2b5a::f0 |
TCP: 80, 443, 5349 UDP: 10000, 3478 |
Domains allowlist
| Category | Domain name | Ports |
| Required | *.flipcorp.de | TCP: 443, 80 UDP: 443 |
| Required | *.flip-app.com | TCP: 443, 80 UDP: 443 |
| Required | *.getflip.com | TCP: 443, 80 UDP: 443 |
| Required | *.getflip.cloud | TCP: 443, 80 UDP: 443 |
| Required | .getflip.email | TCP: 443, 80 UDP: 443 |
| Required | *.getflip.link | TCP: 443, 80 UDP: 443 |
| Required | Google FCM Help | See Link. |
| Required | Apple Help | See Link. |
| Required | *.getflip.dev | TCP: 443, 80 UDP: 443 |
| Optional. Required if you use Flip CMS (Form and Page builder). |
*.flipcms.de | TCP: 443, 80 UDP: 443 |
| Optional. Required if you use Flip Video Conferences. |
meet.flipapp.de | TCP: 80, 443, 5349 UDP: 10000, 3478 |
If you use a custom domain for Flip, you must whitelist it as well.
Allowlist Email
Depending on your organization’s network security requirements, allowlisting specific Flip Email domains is necessary to ensure successful delivery and to avoid the spam folder.
| Category | Sender Domains |
| Required | flipapp.de flipcms.de |
If you use a Proxy
Please ensure that you provide Flip with a by-pass. The following specifications will help.
- The proxy server must support WebSocket connections.
- The proxy HTTP version should be set as 1.2.
- Source IP/host: see the IP adresses above.
- Source port: 80. 80 is used for users that access Flip through HTTP to direct them to HTTPS (blocking 80 is not recommended).
- Destination port: 443 (SSL). 443 is used for HTTPS.
- Protocol: HTTPS
If you using an MDM
Our Android and iOS app uses certificate pinning also known as SSL Pinning. Please ensure that the SSL certificates for operating the mobile apps with VPN/MDM are not manipulated.
WebSockets
The Flip applications requires WebSocket connections. If you're having issues with the Chat or Newsfeed but the settings pages open as expected this might mean that your connection does not support WebSockets. To test your connection, please open this website on the corresponding device.
If the Websockets are identified, you'll see the following message:
If the result is different, something in your network is likely blocking WebSocket connections. If this is the case, try the following:
- Use a different network connection
- Use or turn off a VPN
- If you are using a corporate connection, contact your network administrator and ask them to enable WebSocket connections on ports TCP/80, TCP/443 (TLS) and UDP/443. These ports may be closed or filtered within your corporate network for security reasons. To establish a connection, these ports should be open for Flip addresses to access (see the addresses in the "If you use a Firewall" section below).
If the WebSockets test page reports everything's good, but you're still having trouble please contact Flip Support.
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