User Agent Analyzer

Analyze any user agent string to extract browser, operating system, device type, and rendering engine. Your current user agent is auto-detected below — or paste any UA string for analysis. All parsing runs locally in your browser.

User Agent String

What Is a User Agent String?

A user agent (UA) string is a text identifier that your browser sends with every HTTP request. It tells web servers what browser, operating system, and device you're using. Web servers and routers use this information to serve appropriate content — mobile layouts for phones, desktop layouts for PCs, and optimized pages for different browsers.

User agents are part of the HTTP protocol header and are visible to every website you visit. Understanding your user agent helps with network troubleshooting, web development, and privacy awareness. If you're concerned about what information your browser reveals, also check what your IP address exposes.

User Agent String Format

Modern user agent strings follow a complex format that has evolved over decades of browser history. Here's the anatomy of a typical Chrome UA:

Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36

Component	Meaning	Why It's There
Mozilla/5.0	Mozilla compatibility flag	Legacy — all browsers claim Mozilla compatibility
(Windows NT 10.0; Win64; x64)	OS and architecture	Identifies the platform
AppleWebKit/537.36	Rendering engine	Chrome uses Blink (WebKit fork)
(KHTML, like Gecko)	Compatibility tokens	Legacy — prevents content blocking
Chrome/120.0.0.0	Browser and version	Actual browser identification
Safari/537.36	WebKit version	Legacy — Chrome descends from WebKit

Major Browser User Agents

Here are example user agent strings for the most popular browsers:

Browser	Engine	Key Identifier
Chrome	Blink	`Chrome/xxx` (no Edg/OPR)
Firefox	Gecko	`Firefox/xxx`
Safari	WebKit	`Safari/xxx` (no Chrome)
Edge	Blink	`Edg/xxx`
Opera	Blink	`OPR/xxx`

Pro Tip: When debugging network issues on your router's admin panel at 192.168.1.1, some routers display the user agent of connected devices in the DHCP client list. This can help identify unknown devices on your network — a device showing a smart TV user agent is likely your TV, even if the hostname is generic. Combine this with MAC address lookup for complete device identification.

User Agent and Network Security

User agents have several implications for network security and privacy:

Device fingerprinting — Your UA string, combined with other browser data, creates a unique fingerprint that can track you across websites.
Bot detection — Firewalls and routers use UA strings to identify and block malicious bots and scrapers.
Access control — Some router admin panels restrict access based on UA to prevent automated attacks.
Content filtering — Parental controls and corporate proxies may use UA to apply different policies per device type.
Vulnerability targeting — Attackers may serve exploits tailored to specific browser versions identified via UA.

Keep your browser and router firmware updated to mitigate UA-based targeting. Consider using privacy-focused browsers that reduce UA information.

User Agent Reduction (Privacy Initiative)

Google Chrome has been progressively reducing the information in user agent strings through the User-Agent Reduction initiative. The frozen values include:

OS version — Frozen to a generic value (e.g., "Windows NT 10.0" for all Windows versions)
Device model — Reduced on Android (generic "K" instead of specific model)
Browser minor version — Frozen to "0.0.0" (only major version changes)

The replacement is User-Agent Client Hints (UA-CH), which provides the same information through structured HTTP headers that websites must explicitly request. This gives users more control over what information is shared.

How User Agents Affect Router Admin Panels

Router web interfaces often use UA detection for:

Responsive design — Serving a mobile-friendly admin panel when accessing 192.168.1.1 from a phone.
Feature detection — Enabling or disabling advanced features based on browser capability.
Security logging — Recording which browser and device accessed the admin panel in the connection logs.
Compatibility warnings — Alerting users if their browser is too old for the admin interface.

If you're having trouble accessing your router's admin panel, try switching browsers. Some older router firmware only works reliably with specific browsers. See our router login guide for troubleshooting tips.

Note: User agent strings are easily spoofed — any browser can send any UA string. This means UA-based access control is not a security measure. For real network security, use proper authentication, MAC address filtering, and encrypted connections. Never rely solely on user agent checking for security decisions on your router or web applications.

Key Takeaways

Your user agent tells websites your browser, OS, device type, and rendering engine.
All modern browsers include legacy compatibility tokens (Mozilla/5.0, Safari) for historical reasons.
Chrome is reducing UA information for privacy — Client Hints are the replacement.
User agents can be spoofed easily — never rely on them for security.
Router admin panels use UA for responsive design and compatibility detection.
Combine UA analysis with MAC lookup for complete device identification on your network.

Video: User Agent Strings Explained

Related Guides

Frequently Asked Questions

Can websites see my real browser if I change my user agent?

User agent spoofing changes the UA string, but sophisticated websites can still detect your real browser through JavaScript APIs, canvas fingerprinting, and WebGL rendering differences. Changing your UA provides basic privacy but is not foolproof against advanced fingerprinting techniques.

Why does Chrome's user agent mention Safari?

This is due to the "browser history" of user agent strings. Chrome was built on WebKit (Safari's engine), so it includes the Safari token for backward compatibility. Servers that served content to Safari would also serve it to Chrome. Every major browser carries legacy tokens from its predecessors.

How do I change my user agent?

In Chrome DevTools (F12), go to Network Conditions → User Agent and uncheck "Use browser default." Firefox has the general.useragent.override preference in about:config. Browser extensions like "User-Agent Switcher" make this easier for regular use.

What does a bot user agent look like?

Search engine bots use distinctive UAs: Googlebot/2.1 (+http://www.google.com/bot.html) for Google, Mozilla/5.0 (compatible; Bingbot/2.0) for Bing. Legitimate bots identify themselves clearly. Malicious bots often spoof real browser UAs to avoid detection.

Does my user agent reveal my location?

No, user agents don't contain location data. Your IP address reveals your approximate location, but the UA string only shows browser, OS, and device information. Language preferences in HTTP headers (Accept-Language) can suggest your region but not your specific location.

Can my router see user agent strings?

Standard home routers don't inspect HTTP headers (including user agents) unless they have deep packet inspection (DPI) enabled. Enterprise firewalls and content filters do examine UAs for policy enforcement. Your router's DHCP client list shows device hostnames and MAC addresses, not user agents.

About Tommy N.

Tommy is the founder of RouterHax and a network engineer with 10+ years of experience in home and enterprise networking. He specializes in router configuration, WiFi optimization, and network security. When not writing guides, he's testing the latest mesh WiFi systems and helping readers troubleshoot their home networks.