Websites by tracking ID
Every analytics property, tag manager container, advertising pixel and site-verification token in a page's source is a public identifier. Look one up to see every site in the index that carries it, or browse a kind to see the most shared values.
| Identifier | Vendor | What it is | Sites |
|---|---|---|---|
| Google Analytics 4 measurement id | The G- id a gtag.js snippet configures | 1,000,689 | |
| Google Tag Manager container | The GTM- container id | 816,228 | |
| reCAPTCHA site key | The site key the reCAPTCHA loader or widget carries | 663,430 | |
| Universal Analytics property id | The UA- id of analytics.js or gtag.js (retired in 2024, still in many pages) | 592,343 | |
| Google site verification | The google-site-verification meta tag: a Search Console owner | 365,404 | |
| Google tag id | The GT- id of a Google tag | 205,191 | |
| Meta pixel id | Meta | The pixel id fbq('init') passes | 203,050 |
| Google Ads conversion id | The AW- id gtag.js configures | 135,251 | |
| Yandex Metrica counter | Yandex | The counter id ym() initialises | 107,165 |
| AdSense publisher id | The ca-pub- id of adsbygoogle | 102,656 | |
| Facebook domain verification | Meta | The facebook-domain-verification meta tag: a Business Manager owner | 63,194 |
| Bing site verification | Microsoft | The msvalidate.01 meta tag: a Bing Webmaster Tools owner | 56,592 |
| Hotjar site id | Hotjar | The hjid of the Hotjar snippet | 46,930 |
| Facebook app id | Meta | The fb:app_id meta tag | 40,664 |
| Yandex site verification | Yandex | The yandex-verification meta tag | 35,186 |
| Pinterest site verification | The p:domain_verify meta tag | 30,392 | |
| Matomo site id | Matomo | The setSiteId of a Matomo tracker, with its host | 29,786 |
| Cloudflare Web Analytics token | Cloudflare | The token of the Cloudflare beacon | 19,078 |
| HubSpot portal id | HubSpot | The portal id in the js.hs-scripts.com loader URL | 17,461 |
| Plausible data-domain | Plausible | The data-domain of the Plausible script | 13,219 |
| LinkedIn Insight Tag partner id | The _linkedin_partner_id of the Insight Tag | 12,965 | |
| Sentry DSN host | Sentry | The public key and host of a Sentry DSN | 11,937 |
| tawk.to property id | tawk.to | The property id in the embed.tawk.to URL | 8,546 |
| TikTok pixel id | TikTok | The pixel id ttq.load() passes | 5,713 |
| Ahrefs site verification | Ahrefs | The ahrefs-site-verification meta tag | 5,475 |
| Intercom app id | Intercom | The app_id of the Intercom messenger | 3,862 |
| X (Twitter) pixel id | X | The pixel id twq('config') passes | 3,734 |
| Segment write key | Twilio Segment | The write key analytics.load() passes | 3,659 |
| Pinterest tag id | The tag id pintrk('load') passes | 2,578 | |
| Crisp website id | Crisp | The CRISP_WEBSITE_ID of the chat widget | 2,123 |
| Google Marketing Platform (DoubleClick) id | The DC- id gtag.js configures | 2,018 | |
| Mixpanel project token | Mixpanel | The token mixpanel.init() passes | 1,491 |
| Microsoft Clarity project id | Microsoft | The project id in the clarity.ms tag URL | 923 |
| Snap pixel id | Snap | The pixel id snaptr('init') passes | 673 |
| Google Merchant Center id | The MC- id gtag.js configures | 13 |
Questions
- What is a tracking ID reverse lookup?
- Every analytics tag, tag manager container, advertising pixel and site-verification meta tag carries a public identifier in the page source. Sites run by the same owner or agency often share one. The lookup lists every site in the index whose stored source contains a given id, so a property id or container id becomes a list of the sites it is used on.
- Where do the identifiers come from?
- From the stored source itself. PageSourceSearch keeps the exact bytes of the pages and first-party scripts it crawls and reads the ids out of the loader snippets and meta tags: the G-, UA-, GTM-, AW- and DC- ids of Google tags, the Meta pixel id, AdSense publisher ids, Hotjar, Clarity, HubSpot, Intercom, Segment, TikTok, LinkedIn, Pinterest, X and Snap tags, Matomo, Plausible, Mixpanel, Crisp, tawk.to and Sentry, and the site-verification tokens of Google, Bing, Yandex, Facebook, Pinterest and Ahrefs.
- Is the list of sites complete?
- It covers the sites the crawler has stored. A site whose tag is injected by a tag manager at run time and not present in the served HTML or in a first-party script is not found by the id of that tag, only by the container's.
See also sites by third-party host, by technology, or the profile of one site.