Open Notify ISS API

Free API returning the International Space Station's live latitude and longitude. No key, updates in real time. Tested curl example and live JSON response.

No API key requiredCORS enabledFree tier

Endpoint tested and returned HTTP 200 on 19 Aug 2026

What is the Open Notify ISS API?

The Open Notify ISS API returns the current latitude and longitude of the International Space Station in real time. It is completely free, requires no API key, and updates continuously as the station orbits.

This API returns the ISS's position right now, and because the station orbits Earth roughly every 90 minutes at about 7.66 km per second, the coordinates change visibly between requests made seconds apart — which makes it unusually satisfying for demos.

It is a favourite for teaching polling and live map updates, since the data genuinely changes in real time without you having to fake it. Note the endpoint is HTTP only, so call it from a server rather than an HTTPS page.

Quick facts

Base URL: http://api.open-notify.org
Authentication: No key required.
Rate limit: No published limit, but the position only meaningfully changes every few seconds — polling faster is wasteful.
Pricing: Free.
CORS: Enabled — callable directly from browser JavaScript
Official docs: Read the docs

How to use the Open Notify ISS API

Every request below was executed against the live API on 19 Aug 2026, and the response shown is the real body it returned — not an illustration.

1. Get the ISS's current position

GET http://api.open-notify.org/iss-now.json

curl

curl 'http://api.open-notify.org/iss-now.json'

JavaScript (fetch)

const res = await fetch("http://api.open-notify.org/iss-now.json");
if (!res.ok) throw new Error(`Request failed: ${res.status}`);
const data = await res.json();
console.log(data);

Python (requests)

import requests

res = requests.get("http://api.open-notify.org/iss-now.json", timeout=20)
res.raise_for_status()
print(res.json())

Response — HTTP 200

{
  "timestamp": 1787144814,
  "message": "success",
  "iss_position": {
    "latitude": "-48.2974",
    "longitude": "118.4108"
  }
}

2. List the people currently in space

GET http://api.open-notify.org/astros.json

curl

curl 'http://api.open-notify.org/astros.json'

JavaScript (fetch)

const res = await fetch("http://api.open-notify.org/astros.json");
if (!res.ok) throw new Error(`Request failed: ${res.status}`);
const data = await res.json();
console.log(data);

Python (requests)

import requests

res = requests.get("http://api.open-notify.org/astros.json", timeout=20)
res.raise_for_status()
print(res.json())

Response — HTTP 200

{
  "people": [
    {
      "craft": "ISS",
      "name": "Oleg Kononenko"
    },
    {
      "craft": "ISS",
      "name": "Nikolai Chub"
    },
    {
      "craft": "ISS",
      "name": "Tracy Caldwell Dyson"
    },
    {
      "craft": "ISS",
      "name": "Matthew Dominick"
    },
    {
      "craft": "ISS",
      "name": "Michael Barratt"
    },
    {
      "craft": "ISS",
      "name": "Jeanette Epps"
    },
    {
      "craft": "ISS",
      "name": "Alexander Grebenkin"
    },
    {
      "craft": "ISS",
      "name": "Butch Wilmore"
    },
    {
      "craft": "ISS",
      "name": "Sunita Williams"
    },
    {
      "craft": "Tiangong",
      "name": "Li Guangsu"
    },
    {
      "craft": "Tiangong",
      "name": "Li Cong"
    },
    {
      "craft": "Tiangong",
      "name": "Ye Guangfu"
    }
  ],
  "number": 12,
  "message": "success"
}

Response fields

iss_position.latitudestring: Current latitude as a string — parse before using.
iss_position.longitudestring: Current longitude as a string.
timestampinteger: Unix timestamp of the reading.
messagestring: `success` when the request worked.

What you can build with the Open Notify ISS API

Plot the ISS live on a map and animate its path
Teach polling and real-time UI updates with genuinely changing data
Build a space education dashboard for classrooms
Trigger a notification when the station passes over a location

Common errors and how to fix them

Mixed content blocked

The endpoint is HTTP only.

Fix: Call it from your backend and proxy the result to an HTTPS front end.

Coordinates treated as strings

Latitude and longitude are returned as strings.

Fix: Parse them to numbers before plotting, or your map library will silently misplace the marker.

Open Notify ISS API — frequently asked questions

Is there a free API to track the ISS?

Yes. The Open Notify ISS API returns the station's live latitude and longitude with no API key required, updating in real time.

How often does the ISS position change?

Continuously — the station travels at about 7.66 km per second and orbits Earth roughly every 90 minutes, so the coordinates differ noticeably even a few seconds apart.

Why are the coordinates strings instead of numbers?

The API returns them as JSON strings. Parse them with parseFloat or equivalent before plotting, otherwise mapping libraries will misinterpret them.

Can I use this API on an HTTPS website?

Not directly — the endpoint is HTTP only, so browsers block it as mixed content. Fetch it server-side and pass the result to your front end.

Tools that pair with this API

JSON Formatter

Format, beautify and minify JSON online with 2-space, 4-space or tab indentation. Sort keys alphabetically and catch syntax errors instantly — free and private.

Unit Converter

Convert between units of length, weight, temperature, area, volume, speed, time and data storage instantly, with a swap button and common conversion tables.

Timestamp Converter

Convert timestamps to human-readable dates and dates back to timestamps. Auto-detects seconds vs milliseconds, shows local, UTC and ISO 8601 formats.

Alternatives to Open Notify ISS API

If Open Notify ISS does not fit, these science & space apis cover similar ground. Every one was called before publishing, and each links to its own reference page with a working curl command and the response it returned.

API	What it does	Auth	CORS	Last verified
NASA APOD	Free NASA Astronomy Picture of the Day API. Daily space images with expert explanations, HD URLs and archive access back to 1995. Tested curl example.	Key	Yes	19 Aug 2026
USGS Earthquake	Free USGS earthquake API with no key: live global seismic events as GeoJSON, filterable by magnitude, time and location. Tested curl example and live response.	No key	Yes	19 Aug 2026
Launch Library 2	Free rocket launch API with no key: upcoming and past launches from every space agency, with rockets, missions, pads and live stream links. Tested example.	No key	Yes	19 Aug 2026
Wikipedia REST API	Free Wikipedia REST API with no key: article summaries, extracts, thumbnails and full content in 300+ languages. CORS enabled. Tested curl example.	No key	Yes	19 Aug 2026
JPL Horizons	Free NASA JPL Horizons API with no key: compute high-precision ephemerides, positions, velocities and physical data for planets, moons, asteroids, comets and spacecraft.	No key	No	21 Aug 2026
JPL Small-Body Database	Free NASA JPL Small-Body Database API with no key: orbital elements, physical parameters, discovery data and close-approach records for every known asteroid and comet.	No key	No	21 Aug 2026

All Science & Space APIs

Open Notify ISS is an independent third-party service and is not affiliated with ByteTools or ByteVancer. Details on this page were verified on 19 Aug 2026; always check the official documentation before relying on this API in production, as terms and limits can change.