---
title: "Free Network Exposure Checker"
description: "See which ports and services your server exposes to the internet, and which of them deserve a second look. Free, no account needed."
url: "https://testomato.com/tools/network-exposure/"
---

# Free Network Exposure Checker

See which ports and services your server exposes to the internet — and which of them are worth a second look.

## Free network exposure checker

This tool shows what your server looks like from the outside — which **ports are open**, which services answer on them, and whether any known vulnerabilities are associated with the host. The data comes from [Shodan](https://www.shodan.io/), which continuously scans the public internet.

## Which open ports are normal?

Ports 80 (HTTP) and 443 (HTTPS) are open on every running website — seeing them is expected, not a problem. What deserves a second look are services meant for administrators rather than visitors:

- **21 (FTP)** and **23 (Telnet)** — send credentials unencrypted.
- **22 (SSH)** and **3389 (RDP)** — remote access; fine if deliberate and hardened, worth restricting to known addresses.
- **3306 (MySQL)**, **5432 (PostgreSQL)**, **6379 (Redis)**, **27017 (MongoDB)**, **9200 (Elasticsearch)** — databases are rarely meant to be reachable from the internet.

## What this tool does not do

Nothing is sent to your server: the lookup only reads what Shodan already recorded, so it is not a port scan and leaves no trace in your logs. Results are cached for one hour.

## Keep an eye on it continuously

A port that opens next month is the one that matters. Testomato's [monitoring](https://testomato.com/uptime-monitoring/) checks your site's external exposure every night on paid plans and alerts you when a new service appears.

## Get alerted when a new port opens on your server

You can try it all free for 14 days with **no credit card** and **no commitment**.

[Monitor Your Website](https://testomato.com/sign-up/ "Monitor Your Website")