---
title: Configuration details of SaaS
short: SaaS configuration
type: guide
tier: enterprise
order: 0
order_enterprise: 96
meta_title: app.humansignal.com and app.humansignal.eu Settings
meta_description: This page contains information about the settings that are used on app.humansignal.com and app.humansignal.eu, available to HumanSignal SaaS customers.
section: "Install & Setup"
---

This document describes the IP configuration, hostnames, and usage limits that govern the interactions with app.humansignal.com (app.heartex.com).

## Mail configuration

app.humansignal.com (app.heartex.com) sends emails from the `humansignal.com` domain by using [SendGrid](https://sendgrid.com/), and has its own dedicated IP addresses:

- `208.117.59.219`

app.humansignal.eu sends emails from the `humansignal.eu` domain by using [SendGrid](https://sendgrid.com/), and has its own dedicated IP address in EU region:

- `159.183.231.189`

## IP Ranges

### app.humansignal.com (app.heartex.com)

#### Inbound Traffic IP Addresses
- `34.199.69.93`
- `52.22.82.31`
- `3.233.209.176`

#### Outbound Connections IP Addresses
*Used for Import/Export, ML backends, and Prompts*

- `3.219.3.197`
- `34.237.73.3`
- `44.216.17.242`

### app.humansignal.eu

#### Inbound Traffic IP Addresses
- `3.79.91.185`
- `63.176.196.34`
- `18.153.87.16`

#### Outbound Connections IP Addresses
*Used for Import/Export, ML backends, and Prompts*

- `52.59.18.15`
- `18.194.85.62`
- `54.93.122.250`

## Hostname list

For setting up allow-lists in local HTTP(S) proxies, or other web-blocking software on user-end computers, add the following hostnames:

- `app.humansignal.com`
- `app.humansignal.eu`

Please note that our documentation and company pages, served via https://app.humansignal.com/docs/api and https://humansignal.com/ respectively, load certain page content directly from commonly used public CDN hostnames.

## Usage Limits

Label Studio imposes rate limits on a per-Access Token basis. If a request exceeds the rate limit, a response with a 429 status code is returned. Clients are advised to pause and retry after a short delay in such instances.

| Path                      | Rate limit                                                 |
|---------------------------|------------------------------------------------------------|
| `/api/projects/*/import`  | `1 request / 1 second`                                     |
| `/api/tasks/*/annotations`| `5 request / 1 second`                                     |
| `/api`                    | Limits are set per user within an organization. The default limit is:<br/><br/>`15 requests / 1 second` per user |



## Other Operational Limits

| Setting                  | Default Limit |
|--------------------------|---------------|
| Maximum import file size | 200 MB        |
| Timeout for page load    | 90 seconds    |