What is a Device ID? How to Find it?

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In our hyper-connected world, every interaction you have with a mobile app or a website is anchored by a hidden string of characters: the Device ID. Whether you are a developer, a digital marketer, or a privacy-conscious user, understanding what happens behind the screen is essential.

This comprehensive guide explores everything from the technical definition of a device ID to the step-by-step methods for finding it on Android and iPhone.

What is a Device ID?

A device ID is a unique alphanumeric string assigned to an individual hardware unit. Think of it as a digital “social security number” for your electronics. It allows software, servers, and networks to differentiate one specific smartphone or tablet from millions of others.

Device ID Example

To help visualize this, what is an example of a device ID? Depending on the platform, it looks like a long, randomized string:

Android (AAID): 38400000-8cf0-11bd-b23e-10b96e40000d
iOS (IDFA): EA7583CD-A667-48BC-B3D6-19FB31793740

These identifiers are stored directly on the hardware or within the operating system, making them more persistent than browser cookies.

Device ID vs. IP Address: What’s the Difference?

A common point of confusion for many users is: Is device ID the same as IP address?

The short answer is no. While both are used for identification, they serve very different purposes:

Feature	Device ID	IP Address
Persistence	Permanent (or stays until a factory reset).	Temporary (changes based on your Wi-Fi/Network).
Scope	Identifies the physical hardware.	Identify your location on the internet.
Primary Use	App functionality and ad tracking.	Routing data and website communication.

What is a Device ID on Android?

On the Android ecosystem, things are a bit more complex because there are different “types” of IDs. When people ask, “What is a device ID on Android?” they are usually referring to one of two things:

The Android ID (SSAID): A 64-bit number randomly generated when you first set up your device. It stays the same unless you perform a factory reset.
The Google Advertising ID (AAID): This is a user-resettable ID used by marketers to serve personalized ads.

What is a Samsung Device ID?

Samsung devices run on Android, so they use the standard Android identifiers. However, what is a device ID Samsung specifically refers to may also include the IMEI (International Mobile Equipment Identity). While the Android ID is for software, the IMEI is a hardware-level serial number used by carriers to identify the physical phone on a cellular network.

How to Find Device ID on Android

If you need to provide your ID for app testing or troubleshooting, you might wonder, “How do I find my device ID?”

Method 1: Using the Settings Menu

Open Settings.
Scroll down to About Phone.
Tap on Status or Hardware Information.
Here, you can see your IMEI or Serial Number. (Note: The software-level “Android ID” is often hidden from this menu for security).

Method 2: Using a Dial Code

You can find your hardware ID (IMEI) by opening your phone dialer and typing:

*#06#

The ID will immediately pop up on your screen.

Method 3: Third-Party Apps

Since the “Android Advertising ID” is what most developers need, you can download “Device ID” apps from the Play Store. These apps fetch your AAID and SSAID in one click.

Android Device ID Tracking: How Marketers Use It

Android device ID tracking is a cornerstone of the free-app economy. By tracking your ID, developers can:

Prevent Fraud: Ensure that one user isn’t creating 100 fake accounts to game a system.
Personalization: Save your game progress or app preferences across different sessions.
Attribution: If you see an ad for a shoe app and then download that app, the device ID tells the advertiser, “This specific user responded to that specific ad.”

What is Device ID in iPhone?

Apple takes a slightly different approach to privacy. On an iPhone, the primary identifier is the IDFA (Identifier for Advertisers).

Understanding IDFA and Privacy

Since the release of iOS 14.5, Apple introduced App Tracking Transparency (ATT). Now, when you open an app, it must ask: “Allow this app to track your activity across other companies’ apps and websites?” If you say no, the app receives a string of zeros instead of your real IDFA, effectively blocking tracking.

How to Find Device ID on iPhone

Finding your IDFA isn’t as simple as checking a menu because Apple hides it to protect privacy. However, you can find your UDID (Unique Device Identifier) for development purposes:

Connect your iPhone to a Mac or PC.
Open Finder (Mac) or iTunes (Windows).
Click on your device name.
Click on the text under the device name (where it shows the serial number) until it switches to show the UDID.

How to Track Device ID and Device ID Check Online

For businesses and developers, knowing how to track device ID effectively is vital for growth.

Using Mobile Measurement Partners (MMPs)

Companies like AppsFlyer or Adjust provide SDKs (Software Development Kits) that developers integrate into their apps. These tools automatically handle the tracking and hashing of device IDs, ensuring data is collected securely and within legal bounds (like GDPR or CCPA).

Device ID Check Online

Can you do a device ID check online? There are several web-based tools where you can enter an IMEI or a Serial Number to check:

Warranty Status: See if your device is still covered.
Blacklist Status: Check if a second-hand phone was reported stolen.
Authenticity: Ensure a device is a genuine Samsung or Apple product rather than a knock-off.

Warning: Never share your unique Device ID or IMEI on public forums. Malicious actors can use these IDs to spoof your device or attempt to bypass security protocols.

The Importance of Privacy in Device Identification

As users become more tech-savvy, the way we handle device IDs is changing.

Resetting IDs: On both Android and iOS, you can go into your “Privacy” or “Google” settings and “Reset Advertising ID.” This gives you a fresh digital start, making it harder for advertisers to link your past behavior to your future actions.
Opting Out: You can choose “Limit Ad Tracking” on older devices or simply deny permission on newer ones.

Conclusion

A device ID is a unique digital identifier that links your physical device to the online services and apps you use, helping ensure stable performance, personalization, and targeted experiences. Examples include Android ID for system functionality and IDFA on iPhone for advertising and marketing purposes. Whether you need a device ID example for clarity or want to find your device ID on Android for troubleshooting, it serves as your device’s digital signature. It is important to safeguard this identifier, avoid sharing it with untrusted sources, and use available privacy controls to manage how it is accessed and used.