diff --git a/src/lib/content/content-field-mapper.ts b/src/lib/content/content-field-mapper.ts
index a9f821a..9ffea9c 100644
--- a/src/lib/content/content-field-mapper.ts
+++ b/src/lib/content/content-field-mapper.ts
@@ -100,7 +100,7 @@ export class ContentFieldMapper {
       errors += contentMappingResult.errors;
     }
     // Handle URL fields with potential asset references
-    else if (typeof fieldValue === "string" && fieldValue.includes("cdn.aglty.io")) {
+    else if (typeof fieldValue === "string" && this.isAssetUrl(fieldValue, context)) {
       const urlMappingResult = this.mapAssetUrlString(fieldValue, context);
       mappedValue = urlMappingResult.mappedValue;
       warnings += urlMappingResult.warnings;
@@ -129,6 +129,19 @@ export class ContentFieldMapper {
     return { mappedValue, warnings, errors };
   }
 
+  /**
+   *    Domain check for asset URL strings. Matches:
+   *  - any Agility-managed CDN subdomain (cdn.aglty.io, cdn-usa2.aglty.io, *.agilitycms.com, etc.)
+   *  - any URL whose prefix matches a container URL loaded into the asset mapper
+   */
+  private isAssetUrl(value: string, context?: ContentFieldMappingContext): boolean {
+    return (
+      value.includes(".aglty.io") ||
+      value.includes(".agilitycms.com") ||
+      context?.assetMapper?.isKnownAssetUrl(value) === true
+    );
+  }
+
   private isAssetAttachmentField(fieldValue: any): boolean {
     if (!fieldValue || typeof fieldValue !== "object") return false;
 
diff --git a/src/lib/content/content-field-validation.ts b/src/lib/content/content-field-validation.ts
index 80ba84e..1c28740 100644
--- a/src/lib/content/content-field-validation.ts
+++ b/src/lib/content/content-field-validation.ts
@@ -210,7 +210,7 @@ export class ContentFieldValidator {
     };
 
     // Validate asset URLs
-    if (fieldValue.includes("cdn.aglty.io")) {
+    if (this.isAssetUrl(fieldValue, options)) {
       if (!this.isValidAssetUrl(fieldValue)) {
         result.errors.push(`Invalid asset URL format in field ${fieldKey}: ${fieldValue}`);
         result.isValid = false;
@@ -286,12 +286,29 @@ export class ContentFieldValidator {
   }
 
   /**
-   * Validate asset URL format
+   * Domain-agnostic check for asset URL strings. Matches:
+   *  - any Agility-managed CDN subdomain (cdn.aglty.io, cdn-usa2.aglty.io, *.agilitycms.com, etc.)
+   *  - any URL that exactly matches one of the source assets passed in options
+   *    (so customer-supplied custom CDN domains are recognized when source data is available)
+   */
+  private isAssetUrl(value: string, options: ContentValidationOptions): boolean {
+    if (value.includes(".aglty.io") || value.includes(".agilitycms.com")) return true;
+    if (options.sourceAssets) {
+      return options.sourceAssets.some(
+        (asset) => asset?.originUrl === value || asset?.url === value || asset?.edgeUrl === value
+      );
+    }
+    return false;
+  }
+
+  /**
+   * Structural validity check for an asset URL — caller is responsible for
+   * deciding the string is asset-like in the first place (see looksLikeAssetUrl).
    */
   private isValidAssetUrl(url: string): boolean {
     try {
       const urlObj = new URL(url);
-      return urlObj.hostname.includes("cdn.aglty.io") && urlObj.pathname.length > 1;
+      return urlObj.pathname.length > 1;
     } catch {
       return false;
     }
diff --git a/src/lib/content/tests/content-field-mapper.test.ts b/src/lib/content/tests/content-field-mapper.test.ts
index 4851013..9dc7b6b 100644
--- a/src/lib/content/tests/content-field-mapper.test.ts
+++ b/src/lib/content/tests/content-field-mapper.test.ts
@@ -48,6 +48,7 @@ function makeAssetMapper(overrides: any = {}): any {
   return {
     getAssetMappingByMediaUrl: jest.fn().mockReturnValue(null),
     remapUrlByContainer: jest.fn().mockReturnValue(null),
+    isKnownAssetUrl: jest.fn().mockReturnValue(false),
     ...overrides,
   };
 }
@@ -254,6 +255,83 @@ describe("ContentFieldMapper.mapContentFields", () => {
       const result = mapper.mapContentFields(fields, context);
       expect(result.mappedFields.heroUrl).toBe("https://cdn.aglty.io/tgt/assets/img.jpg");
     });
+
+    it("detects a regional .aglty.io subdomain (cdn-usa2.aglty.io) as an asset URL", () => {
+      // Regression check: the old `includes("cdn.aglty.io")` check missed cdn-usa2.aglty.io.
+      const assetMapper = makeAssetMapper({
+        getAssetMappingByMediaUrl: jest.fn().mockReturnValue({ sourceUrl: "different", targetUrl: "x" }),
+        remapUrlByContainer: jest.fn().mockReturnValue("https://cdn-usa2.aglty.io/tgt/file.json"),
+      });
+      const context = { referenceMapper: makeReferenceMapper(), assetMapper };
+      const fields = { config: "https://cdn-usa2.aglty.io/src/mobile/config.json" };
+      const result = mapper.mapContentFields(fields, context);
+      expect(result.mappedFields.config).toBe("https://cdn-usa2.aglty.io/tgt/file.json");
+    });
+
+    it("detects a *.agilitycms.com subdomain as an asset URL", () => {
+      const assetMapper = makeAssetMapper({
+        getAssetMappingByMediaUrl: jest.fn().mockReturnValue({ sourceUrl: "different", targetUrl: "x" }),
+        remapUrlByContainer: jest.fn().mockReturnValue("https://cdndev.agilitycms.com/tgt/file.jpg"),
+      });
+      const context = { referenceMapper: makeReferenceMapper(), assetMapper };
+      const fields = { hero: "https://cdndev.agilitycms.com/src/folder/photo.jpg" };
+      const result = mapper.mapContentFields(fields, context);
+      expect(result.mappedFields.hero).toBe("https://cdndev.agilitycms.com/tgt/file.jpg");
+    });
+
+    it("detects a custom CDN URL via assetMapper.isKnownAssetUrl()", () => {
+      // Customer using a custom CDN host (cdn.ilotteryservices.com). The string
+      // does NOT include .aglty.io/.agilitycms.com, so detection falls through
+      // to the asset mapper, which recognizes it from its loaded container URLs.
+      const assetMapper = makeAssetMapper({
+        isKnownAssetUrl: jest.fn().mockReturnValue(true),
+        getAssetMappingByMediaUrl: jest.fn().mockReturnValue({ sourceUrl: "different", targetUrl: "x" }),
+        remapUrlByContainer: jest.fn().mockReturnValue("https://cdn.ilotteryservices.com/0e9b1234/mobile/file.json"),
+      });
+      const context = { referenceMapper: makeReferenceMapper(), assetMapper };
+      const fields = { config: "https://cdn.ilotteryservices.com/8f5ad099/mobile/file.json" };
+      const result = mapper.mapContentFields(fields, context);
+      expect(assetMapper.isKnownAssetUrl).toHaveBeenCalledWith(fields.config);
+      expect(result.mappedFields.config).toBe("https://cdn.ilotteryservices.com/0e9b1234/mobile/file.json");
+    });
+
+    it("leaves an unrecognized string field unchanged", () => {
+      const assetMapper = makeAssetMapper(); // isKnownAssetUrl returns false by default
+      const context = { referenceMapper: makeReferenceMapper(), assetMapper };
+      const fields = { description: "Just a regular text value, not a URL" };
+      const result = mapper.mapContentFields(fields, context);
+      expect(result.mappedFields.description).toBe("Just a regular text value, not a URL");
+      // Non-asset string should not trigger the asset-URL mapping path
+      expect(assetMapper.getAssetMappingByMediaUrl).not.toHaveBeenCalled();
+    });
+  });
+
+  describe("URL link object fields (href/target/text)", () => {
+    it("remaps the href of an Agility URL field that points at a source asset URL", () => {
+      // Agility's "URL" field type produces an object of shape { href, target, text }.
+      // It does NOT have a `.url` key, so it is not caught by isAssetAttachmentField.
+      // The href value pointing at a source CDN should be remapped to the target CDN.
+      const assetMapper = makeAssetMapper({
+        getAssetMappingByMediaUrl: jest
+          .fn()
+          .mockReturnValue({
+            sourceUrl: "https://cdn-eu.aglty.io/jules-eu-a/pikachu.png",
+            targetUrl: "https://cdn-aus.aglty.io/jules-aus-a/pikachu.png",
+          }),
+      });
+      const context = { referenceMapper: makeReferenceMapper(), assetMapper };
+      const fields = {
+        url: {
+          href: "https://cdn-eu.aglty.io/jules-eu-a/pikachu.png",
+          target: "",
+          text: "",
+        },
+      };
+      const result = mapper.mapContentFields(fields, context);
+      expect(result.mappedFields.url.href).toBe("https://cdn-aus.aglty.io/jules-aus-a/pikachu.png");
+      expect(result.mappedFields.url.target).toBe("");
+      expect(result.mappedFields.url.text).toBe("");
+    });
   });
 
   describe("nested object fields", () => {
diff --git a/src/lib/content/tests/content-field-validation.test.ts b/src/lib/content/tests/content-field-validation.test.ts
index 0253774..a52c2a9 100644
--- a/src/lib/content/tests/content-field-validation.test.ts
+++ b/src/lib/content/tests/content-field-validation.test.ts
@@ -148,6 +148,45 @@ describe("ContentFieldValidator.validateContentFields", () => {
       const result = validator.validateContentFields({ body: longString });
       expect(result.totalWarnings).toBeGreaterThan(0);
     });
+
+    it("validates a regional .aglty.io subdomain (cdn-usa2.aglty.io) as an asset URL", () => {
+      // Regression check: the old `includes("cdn.aglty.io")` check missed cdn-usa2.aglty.io.
+      const result = validator.validateContentFields({
+        config: "https://cdn-usa2.aglty.io/brightstar-qa/mobile/config.json",
+      });
+      expect(result.totalErrors).toBe(0);
+    });
+
+    it("validates a *.agilitycms.com subdomain as an asset URL", () => {
+      const result = validator.validateContentFields({
+        hero: "https://cdndev.agilitycms.com/fcukahpf/posts/photo.jpg",
+      });
+      expect(result.totalErrors).toBe(0);
+    });
+
+    it("recognizes a custom CDN URL by container-prefix match against sourceAssets", () => {
+      // Customer custom CDN host. The validator should derive a container prefix
+      // (host + first path segment) from the assets and accept URLs that share it.
+      const result = validator.validateContentFields(
+        { config: "https://cdn.ilotteryservices.com/8f5ad099/mobile/config.json" },
+        {
+          sourceAssets: [{ url: "https://cdn.ilotteryservices.com/8f5ad099/mobile/other.json" }],
+        }
+      );
+      // Both URLs share the prefix → no warning about asset-not-found.
+      expect(result.totalWarnings).toBe(0);
+      expect(result.totalErrors).toBe(0);
+    });
+
+    it("does not treat a non-asset URL as an asset URL", () => {
+      // String is a URL but no Agility domain and no sourceAsset prefix match.
+      const result = validator.validateContentFields(
+        { link: "https://www.example.com/article/123" },
+        { sourceAssets: [{ url: "https://cdn.ilotteryservices.com/8f5ad099/file.json" }] }
+      );
+      expect(result.totalErrors).toBe(0);
+      expect(result.totalWarnings).toBe(0);
+    });
   });
 
   describe("content ID string fields", () => {
diff --git a/src/lib/mappers/asset-mapper.ts b/src/lib/mappers/asset-mapper.ts
index 3aca31e..2007a27 100644
--- a/src/lib/mappers/asset-mapper.ts
+++ b/src/lib/mappers/asset-mapper.ts
@@ -98,6 +98,26 @@ export class AssetMapper {
     );
   }
 
+  /**
+   * Returns true if the given URL starts with any container edge/origin URL
+   * known to the mapper (source or target). Lets callers identify asset URLs
+   * without hardcoding CDN domains — supports custom CDN hosts.
+   */
+  isKnownAssetUrl(url: string): boolean {
+    if (!url || typeof url !== "string") return false;
+
+    return this.mappings.some((mapping) => {
+      const knownContainerUrls = [
+        mapping.sourceContainerEdgeUrl,
+        mapping.sourceContainerOriginUrl,
+        mapping.targetContainerEdgeUrl,
+        mapping.targetContainerOriginUrl,
+      ].filter((containerUrl): containerUrl is string => typeof containerUrl === "string");
+
+      return knownContainerUrls.some((containerUrl) => url.startsWith(containerUrl));
+    });
+  }
+
   getMappedEntity(mapping: AssetMapping, type: "source" | "target"): mgmtApi.Media | null {
     const guid = type === "source" ? mapping.sourceGuid : mapping.targetGuid;
     const mediaID = type === "source" ? mapping.sourceMediaID : mapping.targetMediaID;
diff --git a/src/lib/mappers/tests/asset-mapper.test.ts b/src/lib/mappers/tests/asset-mapper.test.ts
index 6a044e5..d67a8a0 100644
--- a/src/lib/mappers/tests/asset-mapper.test.ts
+++ b/src/lib/mappers/tests/asset-mapper.test.ts
@@ -208,6 +208,125 @@ describe("AssetMapper.remapUrlByContainer", () => {
     const result = mapper.remapUrlByContainer("https://completely-different.io/file.jpg", "source");
     expect(result).toBeNull();
   });
+
+  it("handles a customer using a custom CDN domain (cdn.ilotteryservices.com) end-to-end", () => {
+    // custom configured domain cdn host
+    const mapper = makeMapper();
+    const src = makeAsset({
+      mediaID: 1,
+      edgeUrl: "https://cdn.ilotteryservices.com/8f5ad099/mobile/configuration/wizard.json",
+      containerEdgeUrl: "https://cdn.ilotteryservices.com/8f5ad099",
+      containerOriginUrl: "https://origin.ilotteryservices.com/8f5ad099",
+    });
+    const tgt = makeAsset({
+      mediaID: 2,
+      edgeUrl: "https://cdn.ilotteryservices.com/0e9b1234/mobile/configuration/wizard.json",
+      containerEdgeUrl: "https://cdn.ilotteryservices.com/0e9b1234",
+      containerOriginUrl: "https://origin.ilotteryservices.com/0e9b1234",
+    });
+    mapper.addMapping(src, tgt);
+
+    // Edge URL swap
+    expect(
+      mapper.remapUrlByContainer("https://cdn.ilotteryservices.com/8f5ad099/draw-games/picks.json", "source")
+    ).toBe("https://cdn.ilotteryservices.com/0e9b1234/draw-games/picks.json");
+
+    // Origin URL swap
+    expect(mapper.remapUrlByContainer("https://origin.ilotteryservices.com/8f5ad099/folder/asset.png", "source")).toBe(
+      "https://origin.ilotteryservices.com/0e9b1234/folder/asset.png"
+    );
+
+    // Detection: source-side URL is recognized
+    expect(mapper.isKnownAssetUrl("https://cdn.ilotteryservices.com/8f5ad099/anything/at/all.json")).toBe(true);
+    expect(mapper.isKnownAssetUrl("https://cdn.ilotteryservices.com/0e9b1234/anything/at/all.json")).toBe(true);
+
+    expect(mapper.isKnownAssetUrl("https://cdn.competitor.com/8f5ad099/file.jpg")).toBe(false);
+    expect(mapper.isKnownAssetUrl("https://cdn.ilotteryservices.com/zzzzzzzz/file.jpg")).toBe(false);
+  });
+});
+
+// ─── isKnownAssetUrl ──────────────────────────────────────────────────────────
+
+describe("AssetMapper.isKnownAssetUrl", () => {
+  it("returns false for empty or non-string input", () => {
+    const mapper = makeMapper();
+    expect(mapper.isKnownAssetUrl("")).toBe(false);
+    expect(mapper.isKnownAssetUrl(null as any)).toBe(false);
+    expect(mapper.isKnownAssetUrl(undefined as any)).toBe(false);
+    expect(mapper.isKnownAssetUrl(123 as any)).toBe(false);
+  });
+
+  it("returns false when no mappings exist", () => {
+    const mapper = makeMapper();
+    expect(mapper.isKnownAssetUrl("https://cdn.aglty.io/anywhere/file.jpg")).toBe(false);
+  });
+
+  it("returns true when URL starts with a source container edge URL", () => {
+    const mapper = makeMapper();
+    const src = makeAsset({ mediaID: 1, containerEdgeUrl: "https://cdn-usa2.aglty.io/brightstar-qa" });
+    const tgt = makeAsset({ mediaID: 2, containerEdgeUrl: "https://cdn-usa2.aglty.io/brightstar-prod" });
+    mapper.addMapping(src, tgt);
+    expect(mapper.isKnownAssetUrl("https://cdn-usa2.aglty.io/brightstar-qa/mobile/file.json")).toBe(true);
+  });
+
+  it("returns true when URL starts with a source container origin URL", () => {
+    const mapper = makeMapper();
+    const src = makeAsset({ mediaID: 1, containerOriginUrl: "https://mediadev.agilitycms.com/aaaaaaaa" });
+    const tgt = makeAsset({ mediaID: 2, containerOriginUrl: "https://mediadev.agilitycms.com/bbbbbbbb" });
+    mapper.addMapping(src, tgt);
+    expect(mapper.isKnownAssetUrl("https://mediadev.agilitycms.com/aaaaaaaa/folder/asset.png")).toBe(true);
+  });
+
+  it("returns true when URL starts with a target container URL", () => {
+    const mapper = makeMapper();
+    const src = makeAsset({ mediaID: 1, containerEdgeUrl: "https://cdn.aglty.io/src" });
+    const tgt = makeAsset({ mediaID: 2, containerEdgeUrl: "https://cdn.aglty.io/tgt" });
+    mapper.addMapping(src, tgt);
+    expect(mapper.isKnownAssetUrl("https://cdn.aglty.io/tgt/some/path.jpg")).toBe(true);
+  });
+
+  it("recognizes URLs on a custom CDN host (PROD-1505 scenario)", () => {
+    // Customer using a custom CDN domain — the container URL the CMS returns
+    // points to their host, not aglty.io. isKnownAssetUrl should still match.
+    const mapper = makeMapper();
+    const src = makeAsset({
+      mediaID: 1,
+      containerEdgeUrl: "https://cdn.ilotteryservices.com/8f5ad099",
+      containerOriginUrl: "https://origin.ilotteryservices.com/8f5ad099",
+    });
+    const tgt = makeAsset({
+      mediaID: 2,
+      containerEdgeUrl: "https://cdn.ilotteryservices.com/0e9b1234",
+      containerOriginUrl: "https://origin.ilotteryservices.com/0e9b1234",
+    });
+    mapper.addMapping(src, tgt);
+    expect(mapper.isKnownAssetUrl("https://cdn.ilotteryservices.com/8f5ad099/mobile/config.json")).toBe(true);
+    expect(mapper.isKnownAssetUrl("https://origin.ilotteryservices.com/8f5ad099/folder/file.png")).toBe(true);
+  });
+
+  it("returns false for a URL that does not match any container URL", () => {
+    const mapper = makeMapper();
+    const src = makeAsset({ mediaID: 1, containerEdgeUrl: "https://cdn.aglty.io/src" });
+    const tgt = makeAsset({ mediaID: 2, containerEdgeUrl: "https://cdn.aglty.io/tgt" });
+    mapper.addMapping(src, tgt);
+    expect(mapper.isKnownAssetUrl("https://unrelated.example.com/file.jpg")).toBe(false);
+  });
+
+  it("ignores mappings whose container URLs are undefined", () => {
+    const mapper = makeMapper();
+    const src = makeAsset({
+      mediaID: 1,
+      containerEdgeUrl: undefined as any,
+      containerOriginUrl: undefined as any,
+    });
+    const tgt = makeAsset({
+      mediaID: 2,
+      containerEdgeUrl: undefined as any,
+      containerOriginUrl: undefined as any,
+    });
+    mapper.addMapping(src, tgt);
+    expect(mapper.isKnownAssetUrl("https://cdn.aglty.io/anything.jpg")).toBe(false);
+  });
 });
 
 // ─── addMapping / updateMapping ───────────────────────────────────────────────