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.gb_Lc{background-color:rgba(32,33,36,1);border-bottom:1px solid #5f6368}.gb_Mc{cursor:pointer}.gb_Nc:empty{display:none}.gb_Mc,.gb_Nc{display:block;min-height:40px;padding-bottom:4px;padding-top:4px;font-family:Roboto,RobotoDraft,Helvetica,Arial,sans-serif;color:rgba(0,0,0,0.87)}.gb_Cc .gb_Mc{color:#e8eaed}.gb_Cc .gb_Nc{color:#9aa0a6}.gb_xc.gb_ka .gb_Mc{padding-left:16px}.gb_xc:not(.gb_ka) .gb_Mc,.gb_xc:not(.gb_ka) .gb_Nc{padding-left:24px}.gb_Mc:hover{background:rgba(0,0,0,0.12)}.gb_Cc .gb_Mc:hover{background:rgba(232,234,237,0.08)}.gb_Mc.gb_Oc{background:rgba(0,0,0,0.12);font-weight:bold;color:rgba(0,0,0,0.87)}.gb_Cc .gb_Mc.gb_Oc{background:rgba(232,234,237,0.12);color:rgba(255,255,255,.87)}.gb_Mc .gb_Pc{text-decoration:none;display:inline-block;width:100%}.gb_Mc .gb_Pc:focus{outline:none}.gb_Mc .gb_Qc,.gb_Nc{padding-left:32px;display:inline-block;line-height:40px;vertical-align:top;width:176px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.gb_Ac .gb_Mc .gb_Qc,.gb_Ac .gb_Nc{padding-left:16px;width:138px}.gb_Fc.gb_s .gb_Pc:focus .gb_Qc{text-decoration:underline}.gb_Mc .gb_Rc{height:24px;width:24px;float:left;margin-top:8px;vertical-align:middle}.gb_Kc>*{display:block;min-height:48px}.gb_ja.gb_ka .gb_Kc>*{padding-top:4px;padding-bottom:4px;padding-left:16px}.gb_ja:not(.gb_ka) .gb_Kc>*{padding-top:8px;padding-bottom:8px;padding-left:24px}.gb_ja:not(.gb_ka) .gb_0c .gb_lc{align-items:center;display:flex}.gb_Kc .gb_lc{display:table-cell;height:48px;vertical-align:middle}.gb_Kc .gb_Lc{background-color:#f5f5f5;display:block}.gb_Kc .gb_Lc .gb_ed{float:right}.gb_ja.gb_ka .gb_Kc .gb_Lc{padding:4px}.gb_ja:not(.gb_ka) .gb_Kc .gb_Lc{padding:8px}.gb_Kc .gb_za{width:40px}.gb_Kc .gb_Ca{position:absolute;right:0;top:50%}.gb_xc .gb_ke{text-decoration:none}.gb_xc .gb_6d{display:inline;white-space:normal;word-break:break-all;word-break:break-word}body.gb_ne [data-ogpc]{transition:margin-left .25s cubic-bezier(0.4,0.0,0.2,1),visibility 0s linear .25s}body.gb_ne.gb_oe [data-ogpc]{transition:margin-left .25s cubic-bezier(0.4,0.0,0.2,1),visibility 0s linear 0s}body [data-ogpc]{margin-left:0}body.gb_oe [data-ogpc]{margin-left:280px}.gb_Ef{cursor:pointer;padding:13px}.gb_Ff{background-color:rgba(0,0,0,0.1);box-shadow:inset 1px 1px 3px rgba(0,0,0,.24);width:34px;height:17px;border-radius:8px;position:relative;transition:background-color ease 150ms}.gb_Ef[aria-pressed=true] .gb_Ff{background-color:rgba(255,255,255,0.1)}.gb_Hf{position:absolute;width:25px;height:25px;border-radius:50%;box-shadow:0 0 2px rgba(0,0,0,.12),0 2px 4px rgba(0,0,0,.24);top:-4px;transform:translateX(-12px);background-color:white;transition:transform ease 150ms}.gb_Ef[aria-pressed=true] .gb_Hf{transform:translateX(20px)}.gb_Hf img{position:absolute;margin:5px;width:15px;height:15px}.gb_pe{line-height:0}.gb_Zd>.gb_pe:only-child{float:right}.gb_pe .gb_ue{display:inline-block}.gb_pe .gb_pb{cursor:pointer}.gb_pe .gb_pb img{opacity:.54;width:24px;height:24px;padding:10px}.gb_sc .gb_pe .gb_pb img{opacity:1}.gb_qe{text-align:right}.gb_ue{text-align:initial}.gb_pe .gb_ve,.gb_pe .gb_we{display:table-cell;height:48px;vertical-align:middle}.gb_pe .gb_ve:not(.gb_xe){overflow:hidden}.gb_Ae{padding-left:16px}.gb_Ae:not(.gb_ka){padding-left:24px}.gb_Be{color:black;opacity:.54}.gb_Ce{background:white;box-shadow:0 5px 5px -3px rgba(0,0,0,0.2),0 8px 10px 1px rgba(0,0,0,0.14),0 3px 14px 2px rgba(0,0,0,0.12);overflow-y:hidden;position:absolute;right:24px;top:48px}.gb_3c{display:none}.gb_3c.gb_Bc{display:block}.gb_4c{background-color:#fff;box-shadow:0 1px 0 rgba(0,0,0,0.08);color:#000;position:relative;z-index:986}.gb_5c{height:40px;padding:16px 24px;white-space:nowrap}.gb_6c{position:fixed;bottom:16px;padding:16px;right:16px;white-space:normal;width:328px;transition:width .2s,bottom .2s,right .2s;border-radius:2px;box-shadow:0 5px 5px -3px rgba(0,0,0,0.2),0 8px 10px 1px rgba(0,0,0,0.14),0 3px 14px 2px rgba(0,0,0,0.12)}@media 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0;vertical-align:text-top;width:1.5em}.gb_bd{line-height:20px;font-size:16px;font-weight:700;color:rgba(0,0,0,.87)}.gb_6c .gb_bd{color:rgba(0,0,0,.87);font-size:16px;line-height:20px;padding-top:8px}.gb_5c .gb_bd,.gb_5c .gb_cd{width:640px}.gb_cd .gb_dd,.gb_cd{line-height:20px;font-size:13px;font-weight:400;color:rgba(0,0,0,.54)}.gb_6c .gb_cd .gb_dd{font-size:14px}.gb_6c .gb_cd{padding-top:12px}.gb_6c .gb_cd a{color:rgba(66,133,244,1)}.gb_ed.gb_fd{padding:0}.gb_fd .gb_D{background:#ffffff;border:solid 1px transparent;border-radius:8px;box-sizing:border-box;padding:16px;right:16px;top:72px;box-shadow:0 1px 2px 0 rgba(65,69,73,0.3),0 3px 6px 2px rgba(65,69,73,0.15)}a.gb_gd{color:#5f6368!important;font-size:22px;height:24px;opacity:1;padding:8px;position:absolute;right:8px;top:8px;text-decoration:none!important;width:24px}a.gb_gd:focus,a.gb_gd:active,a.gb_gd:focus:hover{background-color:#e8eaed;border-radius:50%;outline:none}a.gb_gd:hover{background-color:#f1f3f4;border-radius:50%;outline:none}svg.gb_hd{fill:#5f6368;opacity:1}.gb_id{padding:0;white-space:normal;display:table}.gb_jd{line-height:normal;font-family:Roboto,RobotoDraft,Helvetica,Arial,sans-serif}.gb_fd .gb_1:active{outline:none;box-shadow:0 4px 5px rgba(0,0,0,.16)}.gb_W.gb_kd.gb_ld{border-radius:4px;cursor:pointer;height:16px;color:#5f6368;font-family:Google Sans,Roboto,RobotoDraft,Helvetica,Arial,sans-serif;font-weight:500;letter-spacing:.25px;line-height:16px;padding:8px 6px;text-transform:none}.gb_W.gb_kd:hover{background-color:#f8f9fa}.gb_W.gb_kd:focus,.gb_W.gb_kd:hover:focus{background-color:#f1f3f4;border-color:transparent}.gb_W.gb_kd:active{background-color:#f1f3f4;box-shadow:0 1px 2px 0 rgba(60,64,67,0.3),0 1px 3px 1px rgba(60,64,67,0.15)}.gb_dd{color:#5f6368;font-family:Roboto,RobotoDraft,Helvetica,Arial,sans-serif;font-size:14px;letter-spacing:.25px;line-height:20px;margin:0;margin-bottom:5px}.gb_md{text-align:right;font-size:14px;padding-bottom:0;white-space:nowrap}.gb_md .gb_nd{margin-left:12px;text-transform:none}a.gb_1.gb_nd:hover{background-color:#2b7de9;border-color:transparent;box-shadow:0 1px 2px 0 rgba(66,133,244,0.3),0 1px 3px 1px rgba(66,133,244,0.15)}a.gb_1.gb_nd:focus,a.gb_1.gb_nd:hover:focus{background-color:#5094ed;border-color:transparent;box-shadow:0 1px 2px 0 rgba(66,133,244,0.3),0 1px 3px 1px rgba(66,133,244,0.15)}a.gb_1.gb_nd:active{background-color:#63a0ef;box-shadow:0 1px 2px 0 rgba(66,133,244,0.3),0 1px 3px 1px rgba(66,133,244,0.15)}.gb_md .gb_nd.gb_od{padding-left:6px;padding-right:14px}.gb_md .gb_ld.gb_nd img{background-color:inherit;border-radius:initial;height:18px;margin:0 8px 0 4px;vertical-align:text-top;width:18px}.gb_pd .gb_id .gb_qd .gb_ld{border:2px solid transparent}.gb_pd .gb_id .gb_qd .gb_ld:focus:after,.gb_pd .gb_id .gb_qd .gb_ld:hover:after{background-color:transparent}.gb_jd{background-color:#404040;color:#fff;padding:16px;position:absolute;top:62px;min-width:328px;max-width:650px;right:8px;border-radius:2px;box-shadow:4px 4px 12px rgba(0,0,0,0.4)}.gb_jd a,.gb_jd a:visited{color:#5e97f6;text-decoration:none}.gb_rd{text-transform:uppercase}.gb_sd{padding-left:50px}.gb_td{color:#3c4043;font-family:Google Sans,Roboto,RobotoDraft,Helvetica,Arial,sans-serif;font-size:16px;font-weight:500;letter-spacing:.1px;line-height:20px;margin:0;margin-bottom:12px}.gb_dd a.gb_vd{text-decoration:none;color:#5e97f6}.gb_dd a.gb_vd:visited{color:#5e97f6}.gb_dd a.gb_vd:hover,.gb_dd a.gb_vd:active{text-decoration:underline}.gb_wd{position:absolute;background:transparent;top:-999px;z-index:-1;visibility:hidden;margin-top:1px;margin-left:1px}#gb .gb_fd{margin:0}.gb_fd .gb_pb{background:#4d90fe;border:2px solid transparent;box-sizing:border-box;font-weight:500;margin-top:21px;min-width:70px;text-align:center}.gb_fd a.gb_1{background:#1a73e8;border-radius:4px;color:#ffffff;font-family:Google Sans,Roboto,RobotoDraft,Helvetica,Arial,sans-serif;font-size:14px;font-weight:500;letter-spacing:.25px;line-height:16px;padding:8px 22px}.gb_fd a.gb_1.gb_xd{background:#d93025}.gb_fd a.gb_1.gb_xd:hover{background-color:#cc3127}.gb_fd a.gb_1.gb_xd:focus,.gb_fd a.gb_1.gb_xd:focus:hover{background-color:#b3332c}.gb_fd a.gb_1.gb_xd:active,.gb_fd a.gb_1.gb_xd:focus:active{background-color:#a6342e}.gb_fd:not(.gb_pd) a.gb_1{float:right}#gb .gb_fd a.gb_pb.gb_pb{color:#ffffff;cursor:pointer}.gb_fd .gb_pb:hover{background:#357ae8;border-color:#2f5bb7}.gb_yd,.gb_qd{display:table-cell}.gb_yd{vertical-align:middle}.gb_yd img{height:48px;padding-left:4px;padding-right:20px;width:48px}.gb_qd{padding-left:13px;width:100%}.gb_fd .gb_qd{padding-top:4px;min-width:326px;padding-left:0;width:326px}.gb_fd.gb_zd .gb_qd{min-width:254px;width:254px}.gb_fd:not(.gb_pd) .gb_qd{padding-top:32px}.gb_Ad{display:block;display:inline-block;padding:1em 0 0 0;position:relative;width:100%}.gb_Bd{color:#ff0000;font-style:italic;margin:0;padding-left:46px}.gb_Ad .gb_Cd{float:right;margin:-20px 0;width:calc(100% - 46px)}.gb_Dd svg{fill:grey}.gb_Dd.gb_Ed svg{fill:#4285f4}.gb_Ad .gb_Cd label:after{background-color:#4285f4}.gb_Dd{display:inline;float:right;margin-right:22px;position:relative;top:2px}.gb_Id{color:#ffffff;font-size:13px;font-weight:bold;height:25px;line-height:19px;padding-top:5px;padding-left:12px;position:relative;background-color:#4d90fe}.gb_Id .gb_Jd{color:#ffffff;cursor:default;font-size:22px;font-weight:normal;position:absolute;right:12px;top:5px}.gb_Id .gb_nd,.gb_Id .gb_kd{color:#ffffff;display:inline-block;font-size:11px;margin-left:16px;padding:0 8px;white-space:nowrap}.gb_Kd{background:none;background-image:linear-gradient(top,rgba(0,0,0,0.16),rgba(0,0,0,0.2));border-radius:2px;border:1px solid #dcdcdc;border:1px solid rgba(0,0,0,0.1);cursor:default!important;filter:progid:DXImageTransform.Microsoft.gradient(startColorstr=#160000ff,endColorstr=#220000ff);text-decoration:none!important}.gb_Kd:hover{background:none;background-image:linear-gradient(top,rgba(0,0,0,0.14),rgba(0,0,0,0.2));border:1px solid rgba(0,0,0,0.2);box-shadow:0 1px 1px rgba(0,0,0,0.1);filter:progid:DXImageTransform.Microsoft.gradient(startColorstr=#14000000,endColorstr=#22000000)}.gb_Kd:active{box-shadow:inset 0 1px 2px rgba(0,0,0,0.3)}.gb_ja .gb_W{color:#4285f4}.gb_ja .gb_X{color:#fff}.gb_ja 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href="/web/20191030212910/https://support.google.com/analytics/contactflow?hl=en" data-stats-ignore="" role="button">Fix issue</a> </span> </div></div></div></div><div class="appbar-bottom"><ul class="breadcrumbs" data-stats-ve="9" itemscope="" itemtype="https://schema.org/BreadcrumbList" role="navigation"><li class="breadcrumbs-item" itemprop="itemListElement" itemscope="" itemtype="https://schema.org/ListItem"><a aria-label="Data privacy and security" href="/web/20191030212910/https://support.google.com/analytics/topic/2919631?hl=en&ref_topic=1008008" itemprop="item" itemtype="https://schema.org/Thing"><span title="Data privacy and security" itemprop="name">Data privacy and security</span><meta content="1" itemprop="position"></a></li><svg viewbox="0 0 48 48"><path d="M17.17 32.92l9.17-9.17-9.17-9.17L20 11.75l12 12-12 12z"></path></svg><li class="breadcrumbs-item" itemprop="itemListElement" itemscope="" itemtype="https://schema.org/ListItem"><a aria-label="IP Anonymization in Analytics" href="/web/20191030212910/https://support.google.com/analytics/answer/2763052" itemprop="item" itemtype="https://schema.org/Thing"><span title="IP Anonymization in Analytics" itemprop="name">IP Anonymization in Analytics</span><meta content="2" itemprop="position"></a></li></ul></div></div> </header> <div class="hcfe-content"> <section class="primary-container"> <div class="page-width-container"> <div class="main-content"> <article class="page"> <section class="article-container" data-stats-ve="35"><h1>IP Anonymization in Analytics</h1><div class="drop-head">A technical explanation of how Analytics anonymizes IP addresses</div><div class="cc"><h2>At a glance</h2> <p>When a customer of Analytics requests IP address anonymization, Analytics anonymizes the address as soon as technically feasible at the earliest possible stage of the collection network. The IP anonymization feature in Analytics sets the last octet of IPv4 user IP addresses and the last 80 bits of IPv6 addresses to zeros in memory shortly after being sent to the Analytics Collection Network. The full IP address is never written to disk in this case.</p> <p>When you <a href="/web/20191030212910/https://support.google.com/analytics/answer/9304153">create a property</a>, you have three options, and for each choice, IP-address anonymization is implemented as follows:</p> <ul class="spaced-list"> <li>Web (collect data from your website): IP-address anonymization is opt in, and is implemented as described in the "In depth" section below.</li> <li>Apps (collect data from your apps): IP-address anonymization is always enabled. With this option, you <a href="/web/20191030212910/https://support.google.com/analytics/answer/9307301">collect data from your apps using the Firebase SDKs</a>.</li> <li>Apps and web (collect data from your apps and/or your website): IP-address anonymization is always enabled. With this option, you <a href="/web/20191030212910/https://support.google.com/analytics/answer/9307301">collect data from your apps using the Firebase SDKs</a>, and <a href="/web/20191030212910/https://support.google.com/analytics/answer/9310895">collect data from your website using a global site tag that includes a Measurement ID for your web data stream</a>.</li> </ul> <h2>In depth</h2> <p>Since 25 May 2010, Analytics has provided the <a href="https://web.archive.org/web/20191030212910/https://developers.google.com/analytics/devguides/collection/gajs/methods/gaJSApi_gat#_gat._anonymizelp">_anonymizelp</a> feature in the ga.js JavaScript library (and more recently <a href="https://web.archive.org/web/20191030212910/https://developers.google.com/analytics/devguides/collection/analyticsjs/field-reference#anonymizeIp" target="_blank" rel="noopener">ga('set', 'anonymizeIp', true)</a> in the analytics.js library) to allow website owners to request that all of their users' IP addresses are anonymized within the product. This feature is designed to help site owners comply with their own privacy policies or, in some countries, recommendations from local data protection authorities, which may prevent the storage of full IP address information. The IP anonymization/masking takes place as soon as data is received by the Analytics Collection Network, before any storage or processing takes place.</p> <p>The process of IP anonymization in Analytics takes place within two steps in the collection pipeline: the JavaScript Tag and the Collection Network. These steps are explained below.</p> <p><img src="//web.archive.org/web/20191030212910im_/https://www.google.com/images/analytics/IPAnonFailoverAnalysis.png"></p> <h3>The Analytics JavaScript Tag</h3> <p>When a JavaScript-enabled web browser loads a page with the Analytics tag (ga.js or analytics.js), it does two things asynchronously: load and process the Analytics function queue and request the Analytics JavaScript. The function queue is a JavaScript array where the different Analytics configuration and collection functions are pushed. These functions, which are set by the site owner when implementing Analytics can include functions like specifying the Analytics account number and actually sending page view data to the Analytics Collection Network for processing.</p> <p>When the Analytics JavaScript runs a function from the function queue that triggers data to be sent to the Analytics Collection Network (this function is typically <a href="https://web.archive.org/web/20191030212910/https://developers.google.com/analytics/devguides/collection/analyticsjs/pages" target="_blank" rel="noopener">ga('send', 'pageview')</a> in the analytics.js JavaScript library and <a href="https://web.archive.org/web/20191030212910/https://developers.google.com/analytics/devguides/collection/gajs/methods/gaJSApiBasicConfiguration#_gat.GA_Tracker_._trackPageview" target="_blank" rel="noopener">_trackPageview</a> in the ga.js library), it sends the data as URL parameters attached to an HTTP request for http://www.google-analytics.com/_utm.gif (for ga.js) and http://www.google-analytics.com/collect (for analytics.js). If the anonymization function has been called prior to the page tracking function, an additional parameter is added to the pixel request. The IP anonymization parameter looks like this: <strong>&aip=1</strong></p> <h3>The Analytics Collection Network</h3> <p>The Analytics Collection Network is the set of servers that provide two main services: the serving of ga.js and analytics.js (the Analytics JavaScript) and the collection of data sent via requests for _utm.gif and /collect.</p> <p>When a request for ga.js, analytics.js, _utm.gif, or /collect arrives, it includes additional information in the HTTP request header (i.e. the type of browser being used) and the TCP/IP header (i.e. the IP address of the requester).</p> <p>As soon as a request for _utm.gif arrives, it is held in memory for anonymization. If the <strong>&aip=1</strong> parameter is found in the request URL (as it would have been placed by the Analytics JavaScript after processing the anonymization function in <a href="https://web.archive.org/web/20191030212910/https://developers.google.com/analytics/devguides/collection/gajs/methods/gaJSApi_gat#_gat._anonymizelp" target="_blank" rel="noopener">ga.js</a> or <a href="https://web.archive.org/web/20191030212910/https://developers.google.com/analytics/devguides/collection/analyticsjs/field-reference#anonymizeIp" target="_blank" rel="noopener">analytics.js</a> ), then the last octet of the user IP address is set to zero while still in memory. For example, an IP address of 12.214.31.144 would be changed to 12.214.31.0. (If the IP address is an IPv6 address, the last 80 of the 128 bits are set to zero.) Only after this anonymization process is the request written to disk for processing. If the IP anonymization method is used, then at no time is the full IP address written to disk as all anonymization happens in memory nearly instantaneously after the request has been received.</p> </div></section> <div class="sub-article-container shaded"> <div class="article-survey-container"> <div class="as"><div class="title">Was this helpful?</div><div class="how-improve">How can we improve it?</div><div class="button-group"><button class="as-button" data-value="5" type="button">Yes</button><button class="as-button" data-value="1" type="button">No</button></div><form data-stats-ve="20"><div class="field"><textarea aria-label="How can we improve it?" name="article_feedback_comment"></textarea></div><button class="submit-button" type="button">Submit<div class="submit-button-target"></div></button></form></div> </div> </div> </article> </div> <script nonce="sWPoCC8jCOMlPjYk+8qy"> window['prt']= new Date().getTime(); window['iml'] = new Date().getTime(); try { 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