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In this document you will find all of the necessary domains and IP addresses to be whitelisted for communication between your environment and HiddenLayer. To ensure secure access to our services, please whitelist the domains and IP addresses as outlined below. These are necessary for accessing various functionalities within our system and for enabling supported outbound integrations.
Stateful Firewall RequiredYour firewall must support stateful connection tracking. A stateless firewall will drop the return packets from HiddenLayer’s endpoints, causing TLS handshake failures and connection resets even if an outbound allow rule is in place.
All HTTP Methods Must Be PermittedFirewall rules must allow both GET and POST methods to all domains listed below. Method-based filtering that permits GET but blocks POST will prevent interaction data from being submitted to the console.

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Ingress

The following domains and IP addresses are required for connections from your environment to HiddenLayer services.

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General Whitelisting Domains

For broad access to all our environments, you can whitelist the following wildcard domains. These domains cover all necessary subdomains for general access.

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Non-Region Specific

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US Region

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EU Region

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Specific Access Domains

For more fine-grained control or specific service access, the following subdomains should be whitelisted. Console Access — This domain is used for accessing the management console. API Access — This domain is used for interacting with our APIs and submitting interaction data.
Region-Specific EndpointsThe non-suffixed domain api.hiddenlayer.ai is an alias that defaults to the US region and is equivalent to api.us.hiddenlayer.ai. Use the region-specific subdomain for consistency across US and EU deployments.

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IP Addresses

If domain-based whitelisting is not available in your environment, the following IP addresses can be used for API and authentication access.
IPs May ChangeSome IPs below are managed by third-party infrastructure providers (AWS Global Accelerator and Cloudflare) and may change without notice. Domain-based whitelisting is always preferred for long-term stability. Use IP-based rules only if domain whitelisting is not available in your environment.
Authentication — auth.hiddenlayer.ai API — api.hiddenlayer.ai

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Egress

The following IP addresses are used by HiddenLayer when initiating outbound connections to your environment for integrations such as webhooks and Splunk data export. Please ensure that inbound connections from these IP addresses are permitted.

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IP Addresses

These IPs correspond to the public IP addresses of the NAT Gateways serving our SaaS environments.

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US Region

  • 3.221.59.6
  • 34.228.90.136
  • 35.170.103.88

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EU Region

  • 3.66.107.41
  • 3.77.95.231
  • 18.185.151.6

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Troubleshooting