{"id":432,"date":"2026-09-01T09:10:00","date_gmt":"2026-09-01T07:10:00","guid":{"rendered":"https:\/\/www.lukaswojcik.com\/?p=432"},"modified":"2026-10-24T04:15:26","modified_gmt":"2026-10-24T02:15:26","slug":"safari-itp-cname-cloaking-and-the-challenges-of-first-party-tracking","status":"publish","type":"post","link":"https:\/\/www.lukaswojcik.com\/blog\/en\/digital-marketing\/safari-itp-cname-cloaking-and-the-challenges-of-first-party-tracking\/","title":{"rendered":"Safari ITP, CNAME Cloaking, and the Challenges of First-Party Tracking"},"content":{"rendered":"<p>A subdomain of the website does not guarantee persistent analytics cookies. Safari can limit cookies from HTTP responses when the endpoint is recognised as a cloaked third party. A useful assessment separates the setting method, DNS destination, browsing mode and stored expiry.<\/p>\n<h2>1. What CNAME cloaking means<\/h2>\n<p>A CNAME makes one hostname an alias of another: <code>data.example.com<\/code> might point to <code>collector.vendor.example<\/code>. The browser still requests the first name. Tracking infrastructure operated elsewhere can consequently appear under the visited website&#8217;s subdomain. CNAME records also serve ordinary hosting purposes; their presence alone does not prove tracking.<\/p>\n<p>WebKit describes detection through the DNS relationship to the website and the top-level document&#8217;s CNAME. This is a technical rule, not a check of company ownership. Cookie domain and actual DNS destination are therefore separate inspection points.<\/p>\n<figure class=\"lw-diagram\"><img decoding=\"async\" src=\"https:\/\/www.lukaswojcik.com\/blog\/wp-content\/uploads\/diagrams\/dia-432-safari-20261024-en.png\" alt=\"Safari protections differ by setting method, trigger and time measurement.\" width=\"1120\" height=\"580\" loading=\"lazy\"><figcaption>Safari protections differ by setting method, trigger and time measurement.<\/figcaption><\/figure>\n<h2>2. Distinguishing seven-day and 24-hour rules<\/h2>\n<ul>\n<li><strong>JavaScript cookies:<\/strong> ITP 2.1 introduced a seven-day expiry cap for persistent cookies created through <code>document.cookie<\/code>. A shorter declared expiry remains shorter.<\/li>\n<li><strong>Link decoration:<\/strong> ITP 2.2 describes a one-day cap for these cookies on the landing page when a domain classified for cross-site tracking initiated navigation and the destination URL has a query string or fragment. A single <code>utm_source<\/code> parameter does not establish that combination.<\/li>\n<li><strong>Other browser storage:<\/strong> The 2020 removal rule for script-writable data such as LocalStorage and IndexedDB counts seven days of Safari use without interaction with the website. This differs from capping a cookie&#8217;s expiry timestamp.<\/li>\n<li><strong>CNAME\/IP cloaking:<\/strong> When a cloaked third-party endpoint is detected, cookies set by the HTTP response can also be capped at seven days. <code>HttpOnly<\/code> does not prevent this cap.<\/li>\n<\/ul>\n<p>WebKit also documents an IP heuristic. The version described in 2024 considers IPv4\/IPv6 address families and shared address prefixes, among other details. Such heuristics can change; they do not establish a permanent recipe for unlimited persistence.<\/p>\n<h2>3. Consequences for measurement<\/h2>\n<p>If an analytics identifier disappears, a later visit may appear as a new browser. Earlier contacts may no longer connect to a conversion. The extent and direction of distortion nevertheless depend on the system, available identifiers and attribution model.<\/p>\n<p>An eight-day absence therefore does not inevitably generate a new ID in every configuration. Nor do all cohorts or A\/B tests automatically lose statistical usefulness. Comparing Safari with Chrome can suggest a problem but cannot isolate its cause: devices, campaigns, consent and behaviour may differ too.<\/p>\n<h2>4. Understanding operator-controlled endpoints and attributes<\/h2>\n<p>A reverse proxy on the same host can provide a controlled data path. A CDN may terminate TLS without its IP addresses belonging to the website operator. Same origin, same site and organisational control are distinct concepts.<\/p>\n<p><code>HttpOnly<\/code> prevents JavaScript access to a cookie. <code>Secure<\/code> restricts transmission to HTTPS, while <code>SameSite<\/code> affects cross-site requests. None guarantees a particular lifetime. A server can also set a cookie without <code>HttpOnly<\/code>; the actual <code>Set-Cookie<\/code> response establishes the setting path.<\/p>\n<p>Legitimate sessions and permitted measurement need purpose-appropriate identifiers, suitable retention and consent where required. An operator-controlled domain neither establishes permission to track nor makes tracking immune to browser protection. On 19 October 2026, WebKit additionally described domain-level blocking of identity-resolution infrastructure in operating-system releases 27. This network measure is separate from cookie time limits.<\/p>\n<h2>5. Assessing a specific installation<\/h2>\n<ol>\n<li>Record Safari and operating-system versions, regular or private browsing and relevant protection settings.<\/li>\n<li>Document the hostnames and DNS resolution of the main document and measurement endpoint.<\/li>\n<li>Use Web Inspector to identify the cookie-setting response or script operation. Compare attributes with the expiry actually stored.<\/li>\n<li>Treat return visits, interaction, existing consent and cookie renewal as separate test cases.<\/li>\n<li>Distinguish missing identifiers, blocked requests and business events. One page load does not establish persistence over several days.<\/li>\n<\/ol>\n<div class=\"lw-faq\">\n<h2>Questions and answers<\/h2>\n<h3>Does a click ID alone trigger the 24-hour limit?<\/h3>\n<p>The documented rule combines navigation origin, classification, URL and JavaScript setting. A list of parameter names cannot replace that assessment.<\/p>\n<h3>Are CDNs and same-origin proxies always exempt?<\/h3>\n<p>The CNAME rule also considers the main document&#8217;s CNAME. A CDN serving the entire website therefore differs from a separately delegated tracking subdomain. This does not establish a general exemption from every protection mechanism.<\/p>\n<h3>Does Google Tag Gateway guarantee persistent cookies?<\/h3>\n<p>A path on the website host initially describes routing. The cookie&#8217;s JavaScript or HTTP setting method and applicable rules need separate examination. Neither the product name nor the presence of <code>HttpOnly<\/code> proves lasting measurement continuity.<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Safari ITP limits depend on how cookies and other browser storage are created and used. The article distinguishes CNAME and IP-based cloaking rules, JavaScript storage limits and the limits of same-origin proxies.<\/p>\n","protected":false},"author":1,"featured_media":13992,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6],"tags":[91276,91279,91285,91350,91516,91252],"class_list":["post-432","post","type-post","status-publish","format-standard","hentry","category-digital-marketing","tag-cookies","tag-prywatnosc-danych-pl","tag-first-party-data","tag-safari-itp","tag-tracking","tag-web-analytics"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Safari ITP, CNAME Cloaking, and the Challenges of First-Party Tracking | Lukas Wojcik<\/title>\n<meta name=\"description\" content=\"Safari ITP and CNAME cloaking: cookie lifetimes, attribution effects and limitations of different first-party architectures.\" 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