diff --git a/packages/core/src/domain/configuration/configuration.ts b/packages/core/src/domain/configuration/configuration.ts
index 0ca9d5a6d2..225d51f34a 100644
--- a/packages/core/src/domain/configuration/configuration.ts
+++ b/packages/core/src/domain/configuration/configuration.ts
@@ -226,14 +226,6 @@ export interface InitConfiguration {
    */
   datacenter?: string
 
-  /**
-   * [Internal option] Datadog internal analytics subdomain
-   *
-   * @internal
-   */
-  // TODO next major: remove this option and replace usages by proxyFn
-  internalAnalyticsSubdomain?: string
-
   /**
    * [Internal option] The percentage of telemetry configuration sent. A value between 0 and 100.
    *
diff --git a/packages/core/src/domain/configuration/endpointBuilder.spec.ts b/packages/core/src/domain/configuration/endpointBuilder.spec.ts
index 9090c0da48..4f281422c4 100644
--- a/packages/core/src/domain/configuration/endpointBuilder.spec.ts
+++ b/packages/core/src/domain/configuration/endpointBuilder.spec.ts
@@ -38,15 +38,6 @@ describe('endpointBuilder', () => {
       ).toContain('&dd-evp-encoding=deflate')
     })
 
-    it('should not start with ddsource for internal analytics mode', () => {
-      const url = createEndpointBuilder({ ...initConfiguration, internalAnalyticsSubdomain: 'foo' }, 'rum').build(
-        'fetch',
-        DEFAULT_PAYLOAD
-      )
-      expect(url).not.toContain('/rum?ddsource')
-      expect(url).toContain('ddsource=browser')
-    })
-
     it('accepts extra parameters', () => {
       const extraParameters = ['application.id=1234', 'application.version=1.0.0']
       const url = createEndpointBuilder(initConfiguration, 'rum', extraParameters).build('fetch', DEFAULT_PAYLOAD)
diff --git a/packages/core/src/domain/configuration/endpointBuilder.ts b/packages/core/src/domain/configuration/endpointBuilder.ts
index 0a4cef55ec..22e4334017 100644
--- a/packages/core/src/domain/configuration/endpointBuilder.ts
+++ b/packages/core/src/domain/configuration/endpointBuilder.ts
@@ -2,7 +2,7 @@ import type { Payload } from '../../transport'
 import { timeStampNow } from '../../tools/utils/timeUtils'
 import { normalizeUrl } from '../../tools/utils/urlPolyfill'
 import { generateUUID } from '../../tools/utils/stringUtils'
-import { INTAKE_SITE_FED_STAGING, INTAKE_SITE_US1 } from '../intakeSites'
+import { INTAKE_SITE_US1 } from '../intakeSites'
 import type { InitConfiguration } from './configuration'
 
 // replaced at build time
@@ -57,15 +57,7 @@ function createEndpointUrlWithParametersBuilder(
 }
 
 export function buildEndpointHost(initConfiguration: InitConfiguration) {
-  const { site = INTAKE_SITE_US1, internalAnalyticsSubdomain } = initConfiguration
-
-  if (internalAnalyticsSubdomain && site === INTAKE_SITE_US1) {
-    return `${internalAnalyticsSubdomain}.${INTAKE_SITE_US1}`
-  }
-
-  if (site === INTAKE_SITE_FED_STAGING) {
-    return `http-intake.logs.${site}`
-  }
+  const { site = INTAKE_SITE_US1 } = initConfiguration
 
   const domainParts = site.split('.')
   const extension = domainParts.pop()
@@ -77,7 +69,7 @@ export function buildEndpointHost(initConfiguration: InitConfiguration) {
  * request, as they change randomly.
  */
 function buildEndpointParameters(
-  { clientToken, internalAnalyticsSubdomain, source = 'browser' }: InitConfiguration,
+  { clientToken, source = 'browser' }: InitConfiguration,
   trackType: TrackType,
   api: ApiType,
   { retry, encoding }: Payload,
@@ -103,9 +95,5 @@ function buildEndpointParameters(
     }
   }
 
-  if (internalAnalyticsSubdomain) {
-    parameters.reverse()
-  }
-
   return parameters.join('&')
 }
diff --git a/packages/core/src/domain/configuration/transportConfiguration.spec.ts b/packages/core/src/domain/configuration/transportConfiguration.spec.ts
index 48980d5e26..0b435f150c 100644
--- a/packages/core/src/domain/configuration/transportConfiguration.spec.ts
+++ b/packages/core/src/domain/configuration/transportConfiguration.spec.ts
@@ -1,4 +1,3 @@
-import { INTAKE_SITE_FED_STAGING } from '../intakeSites'
 import type { Payload } from '../../transport'
 import { computeTransportConfiguration, isIntakeUrl } from './transportConfiguration'
 
@@ -6,7 +5,6 @@ const DEFAULT_PAYLOAD = {} as Payload
 
 describe('transportConfiguration', () => {
   const clientToken = 'some_client_token'
-  const internalAnalyticsSubdomain = 'ia-rum-intake'
   const intakeParameters = 'ddsource=browser&dd-api-key=xxxx&dd-request-id=1234567890'
 
   describe('site', () => {
@@ -16,14 +14,6 @@ describe('transportConfiguration', () => {
       expect(configuration.site).toBe('datadoghq.com')
     })
 
-    it('should use logs intake domain for fed staging', () => {
-      const configuration = computeTransportConfiguration({ clientToken, site: INTAKE_SITE_FED_STAGING })
-      expect(configuration.rumEndpointBuilder.build('fetch', DEFAULT_PAYLOAD)).toContain(
-        'http-intake.logs.dd0g-gov.com'
-      )
-      expect(configuration.site).toBe(INTAKE_SITE_FED_STAGING)
-    })
-
     it('should use site value when set', () => {
       const configuration = computeTransportConfiguration({ clientToken, site: 'datadoghq.com' })
       expect(configuration.rumEndpointBuilder.build('fetch', DEFAULT_PAYLOAD)).toContain('datadoghq.com')
@@ -31,25 +21,6 @@ describe('transportConfiguration', () => {
     })
   })
 
-  describe('internalAnalyticsSubdomain', () => {
-    it('should use internal analytics subdomain value when set for datadoghq.com site', () => {
-      const configuration = computeTransportConfiguration({
-        clientToken,
-        internalAnalyticsSubdomain,
-      })
-      expect(configuration.rumEndpointBuilder.build('fetch', DEFAULT_PAYLOAD)).toContain(internalAnalyticsSubdomain)
-    })
-
-    it('should not use internal analytics subdomain value when set for other sites', () => {
-      const configuration = computeTransportConfiguration({
-        clientToken,
-        site: 'us3.datadoghq.com',
-        internalAnalyticsSubdomain,
-      })
-      expect(configuration.rumEndpointBuilder.build('fetch', DEFAULT_PAYLOAD)).not.toContain(internalAnalyticsSubdomain)
-    })
-  })
-
   it('adds the replica application id to the rum replica endpoint', () => {
     const replicaApplicationId = 'replica-application-id'
     const configuration = computeTransportConfiguration({
@@ -74,7 +45,6 @@ describe('transportConfiguration', () => {
       { site: 'ap1.datadoghq.com', intakeDomain: 'browser-intake-ap1-datadoghq.com' },
       { site: 'ddog-gov.com', intakeDomain: 'browser-intake-ddog-gov.com' },
       { site: 'datad0g.com', intakeDomain: 'browser-intake-datad0g.com' },
-      { site: 'dd0g-gov.com', intakeDomain: 'http-intake.logs.dd0g-gov.com' },
     ].forEach(({ site, intakeDomain }) => {
       it(`should detect intake request to ${intakeDomain} for site ${site}`, () => {
         expect(isIntakeUrl(`https://${intakeDomain}/api/v2/rum?${intakeParameters}`)).toBe(true)
@@ -96,12 +66,6 @@ describe('transportConfiguration', () => {
       })
     })
 
-    it('should detect internal analytics intake request for datadoghq.com site', () => {
-      expect(isIntakeUrl(`https://${internalAnalyticsSubdomain}.datadoghq.com/api/v2/rum?${intakeParameters}`)).toBe(
-        true
-      )
-    })
-
     it('should not detect non intake request', () => {
       expect(isIntakeUrl('https://www.foo.com')).toBe(false)
     })
@@ -129,15 +93,9 @@ describe('transportConfiguration', () => {
       { site: 'ap1.datadoghq.com' },
     ].forEach(({ site }) => {
       it(`should detect replica intake request for site ${site}`, () => {
-        expect(isIntakeUrl(`https://${internalAnalyticsSubdomain}.datadoghq.com/api/v2/rum?${intakeParameters}`)).toBe(
-          true
-        )
-        expect(isIntakeUrl(`https://${internalAnalyticsSubdomain}.datadoghq.com/api/v2/logs?${intakeParameters}`)).toBe(
-          true
-        )
-        expect(
-          isIntakeUrl(`https://${internalAnalyticsSubdomain}.datadoghq.com/api/v2/replay?${intakeParameters}`)
-        ).toBe(true)
+        expect(isIntakeUrl(`https://browser-intake-datadoghq.com/api/v2/rum?${intakeParameters}`)).toBe(true)
+        expect(isIntakeUrl(`https://browser-intake-datadoghq.com/api/v2/logs?${intakeParameters}`)).toBe(true)
+        expect(isIntakeUrl(`https://browser-intake-datadoghq.com/api/v2/replay?${intakeParameters}`)).toBe(true)
       })
     })
   })
diff --git a/packages/core/src/domain/intakeSites.ts b/packages/core/src/domain/intakeSites.ts
index d03225b18c..301585dfdd 100644
--- a/packages/core/src/domain/intakeSites.ts
+++ b/packages/core/src/domain/intakeSites.ts
@@ -9,7 +9,6 @@ export type Site =
   | (string & {})
 
 export const INTAKE_SITE_STAGING: Site = 'datad0g.com'
-export const INTAKE_SITE_FED_STAGING: Site = 'dd0g-gov.com'
 export const INTAKE_SITE_US1: Site = 'datadoghq.com'
 export const INTAKE_SITE_EU1: Site = 'datadoghq.eu'
 export const INTAKE_SITE_US1_FED: Site = 'ddog-gov.com'
diff --git a/packages/core/test/coreConfiguration.ts b/packages/core/test/coreConfiguration.ts
index aaf86a8157..944271132d 100644
--- a/packages/core/test/coreConfiguration.ts
+++ b/packages/core/test/coreConfiguration.ts
@@ -33,7 +33,6 @@ export const EXHAUSTIVE_INIT_CONFIGURATION: Required<InitConfiguration> = {
     clientToken: 'yes',
   },
   datacenter: 'datacenter',
-  internalAnalyticsSubdomain: 'internal-analytics-subdomain.com',
   telemetryConfigurationSampleRate: 70,
   telemetryUsageSampleRate: 80,
   allowedTrackingOrigins: ['chrome-extension://example'],
@@ -79,7 +78,6 @@ export type MapInitConfigurationKey<Key extends string> =
           | 'env'
           | 'version'
           | 'datacenter'
-          | 'internalAnalyticsSubdomain'
           | 'replica'
           | 'enableExperimentalFeatures'
       ? never