What is the Googlebot User-Agent string?

The Googlebot User-Agent string is: Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)

Does Googlebot respect robots.txt?

Yes, Googlebot respects robots.txt directives.

What are Googlebot's IP ranges?

Known Googlebot IP ranges include: 66.249.64.0/19, 64.233.160.0/19, 66.102.0.0/20, 72.14.192.0/18, 209.85.128.0/17, 216.239.32.0/19

GOOGLEBOT

Q: How do I block Googlebot in robots.txt?

To control Googlebot access, add the following to your robots.txt file: User-agent: Googlebot Allow: / Sitemap: https://example.com/sitemap.xml # Selective blocking: # User-agent: Googlebot # Disallow: /admin/ # Disallow: /private/

LOW RISK🔍 SEARCH & AI CRAWLER

Google's primary web crawler for search indexing — the most important bot for SEO

ORGANIZATION

Google

FIRST SEEN

2000-01

RESPECTS ROBOTS.TXT

✓ YES

DOCUMENTATION

developers.google.com

—

DAILY VISITS

—

COUNTRIES ACTIVE

TRACKING

STATUS

—

LAST SEEN

📡 GOOGLEBOT USER-AGENT STRING

Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)

This is the User-Agent header sent by Googlebot in HTTP requests. Use this to identify Googlebot in your server access logs.

📋 ABOUT GOOGLEBOT

Googlebot is Google's primary web crawler and the single most important bot for any website's search visibility. Active since the early 2000s, Googlebot is responsible for discovering, crawling, and indexing web pages for Google Search — the world's most-used search engine processing over 8.5 billion searches per day.

Googlebot operates in two phases: first crawling HTML content, then rendering pages using a headless Chromium-based Web Rendering Service (WRS) to process JavaScript-dependent content. This makes Googlebot one of the most sophisticated crawlers in operation. It adaptively adjusts crawl rate based on server response times and uses multiple crawl strategies including sitemap-based discovery, link following, and URL submissions via Search Console.

NORAD.io monitors Googlebot activity to help site operators ensure their content is being properly crawled and indexed. While Googlebot is essential for search visibility, it's important to distinguish genuine Googlebot traffic from spoofed requests — a common tactic used by malicious crawlers. NORAD verifies Googlebot identity through reverse DNS validation and IP range verification.

🎯 HOW TO DETECT GOOGLEBOT

▸User-Agent contains 'Googlebot/2.1'
▸Verify via reverse DNS: IP should resolve to *.googlebot.com or *.google.com
▸Google publishes its IP ranges in JSON at https://developers.google.com/static/search/apis/ipranges/googlebot.json
▸Googlebot renders JavaScript — it will execute your client-side code
▸Also appears as Googlebot-Image and Googlebot-Video for media crawling

🌐 GOOGLEBOT KNOWN IP RANGES

66.249.64.0/1964.233.160.0/1966.102.0.0/2072.14.192.0/18209.85.128.0/17216.239.32.0/19

Use these CIDR ranges to verify Googlebot identity at the network level. Always combine with User-Agent verification for accurate detection.

🔄 CRAWL BEHAVIOR

Highly sophisticated crawling with JavaScript rendering via Chromium-based Web Rendering Service (WRS). Respects robots.txt, crawl-delay (partially), and meta robots directives. Adaptive crawl rate based on site responsiveness. Discovers pages via sitemaps, links, and Google Search Console submissions.

PURPOSE

Indexes web content for Google Search, Google News, Google Discover, and other Google services. The foundation of Google's search engine that processes billions of pages.

🤖 ROBOTS.TXT CONFIGURATION

User-agent: Googlebot
Allow: /
Sitemap: https://example.com/sitemap.xml

# Selective blocking:
# User-agent: Googlebot
# Disallow: /admin/
# Disallow: /private/

Googlebot respects robots.txt directives. Add this to your robots.txt file at the root of your domain.

→ Complete Guide: robots.txt for AI Bots