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Google Analytics web property IDs, measurement IDs and tracking IDs
By SearchWebCode · Updated November 7, 2026 · Analytics · 2 min read
UA-123456-1. GA4 uses a public G- measurement ID for a web stream and a separate numeric property ID in Analytics administration.If a plugin asks for a tracking ID, a numeric property ID may be the wrong value. Identify the format before copying it into a setup screen or using it to search for websites.
Compare the identifier formats
| Identifier | Example | Where you use it |
|---|---|---|
| Universal Analytics tracking ID, also called web property ID | UA-123456-1 | Legacy Analytics tags. The service is retired, but the string may remain in source. |
| GA4 measurement ID | G-ABCDE12345 | A web data stream's Google tag and integrations that request its measurement ID. |
| GA4 property ID | 123456789 | Property administration and APIs that request a property resource. |
| Data stream ID | A separate numeric value | The data stream's administrative record. It is not the G- measurement ID. |
| Google tag ID | GT-..., or a destination-associated ID | A Google tag that can be connected to destinations. Read its configuration before inferring which service receives data. |
| Tag Manager container ID | GTM-ABC123 | A container that can deploy Analytics and other tags. |
The values above are examples. Two numeric identifiers are not interchangeable just because they have the same shape.
Find your own GA4 measurement ID
In the correct Analytics property, open Admin → Data streams and select the web stream. Copy its measurement ID from the stream details. Google's measurement ID reference explains the G- identifier. Use the field requested by your integration rather than substituting the property's administrative number.
Identify a tag on another website
A direct GA4 installation may expose the measurement ID in gtag/js?id=G-... or a gtag('config', 'G-...') call. A Tag Manager installation may expose only a GTM- container in the original HTML. The GA4 detection guide covers browser checks when the ID is not printed directly.
Choose the identifier for a website lookup
For a public-source search, use a complete G-, UA- or GTM- value that you actually observed. A bare number is more likely to match unrelated text, and a numeric property ID is not normally part of the public tag.
Follow the Analytics ID lookup guide to find matching homepages. If the question is whether the domains are related, use the shared-ID investigation steps before making an ownership claim.
Source counts checked 2026-10-14. They describe stored homepages, not live installations. How the counts are measured.
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Frequently asked questions
Is a GA4 property ID the same as a measurement ID?
No. The numeric property ID identifies the administrative property. A G- measurement ID identifies a web data stream's tag destination.
Can I convert a UA tracking ID into a G- measurement ID?
There is no public conversion formula. Find the measurement ID in the relevant GA4 web stream or its installed tag.
Does GTM- mean Google Analytics is installed?
No. It identifies a Tag Manager container, which can deploy many kinds of tags. Inspect the container's behavior or the page's collection requests to check for GA4.