---
title: "api.openai.com: what uses OpenAI’s API and what blocking affects · Kilobat"
url: "https://kilobat.app/hosts/api-openai-com"
description: "Why apps connect to api.openai.com, how the OpenAI API is used, and what may stop working if you block it."
---

# api.openai.com

`api.openai.com` is the OpenAI API endpoint. Many different apps can send requests to it.

Run by OpenAI · Ports: 443 TCP · Checked: 3 November 2026

## Short answer

The OpenAI API endpoint used by applications making API requests.

Block with care

Blocking this endpoint can prevent applications from using the OpenAI API.

Matches

`api.openai.com`

A name with `*.` covers every name under it: `*.push.apple.com` matches `1-courier.push.apple.com`.

## What it serves

OpenAI's API uses this host for requests from client applications and scripts.

The process name in Kilobat helps identify which program made a connection on this Mac.

A connection does not show the text or other content sent inside an encrypted request.

Request volume depends on the application and the work it performs; a connection alone does not reveal cost.

## Processes that use it

- [Codex](https://kilobat.app/processes/codex): OpenAI's coding agent, available as a desktop app, command-line tool and other interfaces.

## What breaks if you block it

Block with care

Blocking this endpoint can prevent applications from using the OpenAI API.

What breaks if you block it

- Apps and scripts using this API endpoint may fail to make requests.
- Features powered by those requests may stop responding until access returns.

With Kilobat Pro and the network filter, you can block a host for every app or for one app: in Connections, select a connection and choose Block. Apple’s own services are never blocked by Kilobat’s [Protection](https://kilobat.app/docs/blocking#protection) lists.

## Notes

OpenAI also operates other endpoints. Blocking one hostname does not necessarily block every OpenAI service.

If a connection is unexpected, inspect the originating process before deciding whether to block it.

## Sources

- [OpenAI API reference: Authentication](https://platform.openai.com/docs/api-reference/authentication)

Checked on 3 November 2026.