---
title: "Whitelist Lemwatch monitoring IPs — Lemwatch Help"
description: "Allow Lemwatch checks through your firewall, WAF, or rate limiter using our published IP ranges and User-Agent."
canonical: "https://lemwatch.com/help/lemwatch-ip-whitelisting"
source: "https://lemwatch.com"
---

# Whitelist Lemwatch monitoring IPs

> Allow Lemwatch checks through your firewall, WAF, or rate limiter using our published IP ranges and User-Agent.

## Quick answer

 Copy the Lemwatch probe IP ranges and User-Agent from Settings → Monitoring → Probe IPs and add them to your firewall, WAF, and rate limiter allow-lists. This stops false "down" alerts caused by your own security tools.

## What it fixes

- 403/429/503 responses to Lemwatch only

- Sites that show "down" in Lemwatch but load fine in your browser

- Intermittent alerts that clear seconds later

- Bot-challenge pages returning HTML 200s instead of your real site

## Where to find it in Lemwatch

 **Settings → Monitoring → Probe IPs**. Copy the CIDR ranges and the Lemwatch/1.0 User-Agent string.

## How to whitelist

- Open Settings → Monitoring → Probe IPs and copy the ranges.

- Add the IPs to your firewall or WAF allow-list (Cloudflare, AWS WAF, Sucuri, Wordfence, etc.).

- Add the Lemwatch/1.0 User-Agent to any bot-management or rate-limiter rule.

- If you use Fail2Ban or similar, add the IPs to ignoreip .

- Run Check now on the affected site — the alert should clear within 60 seconds.

## FAQ

### Do the IPs change?

 Rarely — we publish 7-day advance notice via the [Changelog](https://lemwatch.com/help/changelog) and email when they do.

### Can I identify Lemwatch by User-Agent alone?

 Yes, but IP + UA is safer since UA strings are trivially spoofed.

## Related

- Cloudflare blocking Lemwatch

- Fixing 5xx errors from firewalls

- Site shows down but is actually up


## Related

- [Help centre](https://lemwatch.com/help)
- [Cloudflare is blocking Lemwatch checks](https://lemwatch.com/help/cloudflare-blocking-lemwatch)
- [Fixing 5xx errors caused by your firewall](https://lemwatch.com/help/fixing-5xx-errors-from-firewall)
- [My Site Shows as Down But It's Working](https://lemwatch.com/help/site-shows-down-but-working)
- [Lemwatch pricing](https://lemwatch.com/pricing)
- [Lighthouse Reports](https://lemwatch.com/help/lighthouse-reports)
- [Keyword Monitoring](https://lemwatch.com/help/keyword-monitoring)