Infrastructure

· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.

SCORE

GRADE

FIX

REVIEW

PASS

INFO

Probed from Singapore, Singapore

302 Found

Checks

5 PASS 3 REVIEW 1 FIX

CDN & Delivery

Action

No CDN detected

FIX

No CDN detected

A CDN can significantly improve load times for users around the world by caching content at edge nodes closer to them.

No CDN detected

Consider using a CDN to improve global delivery speed and reduce origin load.

Redirect Chain

1 redirect(s), 1145 ms total

REVIEW

1 redirect(s), 1145 ms total

Single redirect

Got: https://youku.com → https://www.youku.com/ku/webhome (302)

WWW normalization redirect

Uses 302 (temporary) redirect

If permanent, use 301 instead.

Got: https://youku.com

Redirect overhead: 1145 ms total

Got: 1145 ms

https://youku.com

865 ms · HTTP/1.1

302

https://www.youku.com/ku/webhome

280 ms · HTTP/1.1 FINAL

#	URL	Status	Time	Protocol	Server
1	https://youku.com	302	865 ms	HTTP/1.1	Tengine/Aserver
2	https://www.youku.com/ku/webhome	200	280 ms	HTTP/1.1	Tengine/Aserver

See the visual redirect chain in the HTTP Probe tab →

If permanent, use 301 instead.

Why this matters

302 (Found) is for genuinely temporary redirects — if this redirect is permanent, switch to 301 to preserve SEO equity.

Learn more ▾

Search engines treat 302 as temporary, keeping the original URL indexed and not transferring full link equity to the destination. Use 301 (Moved Permanently) for permanent redirects (HTTP→HTTPS, www-vs-non-www, URL restructures).

Source: Google Search Central

HTTP Probe Timing

Total 928 ms — DNS, TCP, TLS, TTFB, content transfer breakdown

REVIEW

DNS Lookup

5 ms

TCP Connect

226 ms

TLS Handshake

454 ms

Time to First Byte

928 ms

Total Time

928 ms

Connection waterfall

DNS Lookup 5 ms TCP Connect 226 ms TLS Handshake 454 ms Server Processing 243 ms Content Transfer 0 ms

TLS Certificate Expiry & Recommendations

304 days until leaf cert expires — 5 issues to address

REVIEW

Certificate validity

304

days left

0d 30d 60d 90d+

Recommended actions

Prefer TLS 1.3 — TLS 1.2 is acceptable but TLS 1.3 removes RSA key exchange and improves latency
Add includeSubDomains to the HSTS directive
Add the preload directive and submit to hstspreload.org once max-age + includeSubDomains are in place
Enable DNSSEC on your domain for DNS spoofing protection
Enable OCSP stapling on your TLS server to remove a CA roundtrip and protect user privacy

A+

DNS Records

1 A records, 5 ms lookup

PASS

1 A records, 5 ms lookup

Resolves to 1 IPv4 address(es)

Got: 106.11.40.57

Single A record — no DNS redundancy

Multiple A records provide failover if one server goes down.

Has 4 IPv6 (AAAA) record(s)

Got: 2408:4001:f10::fd, 2408:4001:f10::8, 2408:4001:f00::3a, 2408:4001:f00::1af

4 nameserver(s) configured

Got: dns4.youku.com, dns3.youku.com, dns2.youku.com, dns1.youku.com

2 mail exchanger(s) configured

CAA records not checked

CAA record lookup requires a specialized DNS resolver. This check will be available in a future update.

SPF record present in TXT

DNS resolution time: 5 ms

Got: 5 ms

A	106.11.40.57
AAAA	2408:4001:f10::fd, 2408:4001:f10::8, 2408:4001:f00::3a, 2408:4001:f00::1af
CNAME	—
NS	dns4.youku.com, dns3.youku.com, dns2.youku.com, dns1.youku.com
MX	20 mx2.youku.com 20 mx1.youku.com
TXT	_globalsign-domain-verification=FTDnH4nthZ93t8im92Do73f_Qf5B7gsfF9HOCMyiFX _globalsign-domain-verification=snvh2ISWhTkFFwzoPNxCaUKM32JoykjtawQNN5oUzI SPF v=spf1 include:spf1.staff.mail.aliyun.com -all _globalsign-domain-verification=F6MvXUY9C3l1aCXFk3_ztOdy97xXn2Uq2zvNdCQHbw
CAA	Lookup not available with standard resolver

Resolved in 5 ms

Multiple A records provide failover if one server goes down.

Why this matters

Single A record means a single point of failure — if that IP goes down, your site is unreachable until DNS TTL expires.

Learn more ▾

Add multiple A records for round-robin failover, or use a managed DNS provider with health-checked failover (Route 53, Cloudflare, NS1). Short TTL (60-300s) lets clients recover faster on outages.

Source: SRE practice / DNS architecture

CAA record lookup requires a specialized DNS resolver. This check will be available in a future update.

Why this matters

Informational: CAA (Certification Authority Authorization) records weren't checked in this scan.

A+

IPv6 Readiness

IPv6 reachable (238 ms)

PASS

IPv6 reachable (238 ms)

IPv6 is configured and reachable at 2408:4001:f10::fd, 2408:4001:f10::8, 2408:4001:f00::3a, 2408:4001:f00::1af

Got: 238 ms connect

IPv6 Ready

AAAA Records 2408:4001:f10::fd, 2408:4001:f10::8, 2408:4001:f00::3a, 2408:4001:f00::1af Connection Reachable (238 ms)

A+

Crawlability

robots.txt present, sitemap with 51 URLs

PASS

robots.txt present, sitemap with 51 URLs

robots.txt is present

Got: 10240 bytes

sitemap.xml is present

sitemap.xml is valid XML

sitemap.xml contains 51 entries

robots.txt does not reference a sitemap

Add a 'Sitemap:' directive to robots.txt so search engines can discover your sitemap.

Why this matters

robots.txt omits Sitemap: directive — crawlers must fetch /sitemap.xml by convention; reliable but missing the explicit hint.

Source: sitemaps.org

robots.txt 200 OK

Size 10240 B Sitemaps referenced 0 User-agents Blocking No — crawling allowed



<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0, user-scalable=no">
  <title>404 Not Found</title>
  <meta name="format-detection" content="telephone=no, email=no">
  <meta name="description" content="">
  <meta name="spm-id" content="a2h8m.13622031">
  <!--[if lte IE 9]>

      <script src="https://oss.maxcdn.com/libs/html5shiv/3.7.0/html5shiv.js"></script>

      <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.4/jquery.min.js" type="text/javascript"></script>

      <script src="https://dev.g.alicdn.com/youku-node/shiyiCdn/0.0.8/flex.js" type="text/javascript"></script>

    <![endif]-->
   <link rel="Shortcut Icon" href="//img.alicdn.com/tfs/TB1WeJ9Xrj1gK0jSZFuXXcrHpXa-195-195.png" />
    <link type="text/css"
        href="//g.alicdn.com/pc-playpage-components/youku-component-compatible-jquery-black/style/index.css"
        rel="stylesheet">
    <script type="text/javascript"
        src="//g.alicdn.com/pc-playpage-components/youku-component-compatible-jquery-black/index.js"></script>
  <style>
    html {
      min-width: 1239px;

    }
    html.uos {
      min-width: 0px;
      width: 100%;
      height: 100%;
    }
    html.uos::-webkit-scrollbar {
      width : 8px;
      height: 6px;
    }
    
    html.uos::-webkit-scrollbar-thumb {
      background: #303439;
      border-radius: 5px;
    }
    body{
      margin:0;
      background:#121212;
    }
    #root{
      position: relative;
      height: 770px;
      color: #fff;
    }
    .uos body, .uos #root {
      width: 100%;
      height: 100%;
    }
    a {
        text-decoration: none;
    }
    #vip-icon-top + span {
      margin-top: 3px;
    }
    .center {
        position: absolute;
        display: flex;
        left: 50%;
        top: 215px;
        transform: translate(-50%, 0);
        align-items: center;
        width: auto;
        height: auto;
        border-radius: 0px;
        z-index: 2;
        box-shadow: none;
        }
    .uos .center {
      top: 50%;
      transform: translate(-50%, -50%);
    }
    .logo404 {
        width: 270px;
    }
    .content {
        min-width: 300px;
        padding-top: 10px;
        display: flex;
        flex-direction: column;
        position: relative;
        background-color: #121212;
    }
    .contentTitle {
        opacity: 0.6;
        font-family: PingFangSC-Regular;
        font-size: 22px;
        color: #FFFFFF;
    }
    .btnContainer {
        display: flex;
        margin-top: 10px;
    }
    .back, .exit {
        background-image: linear-gradient(-45deg, #00D3FF 0%, #00B7FF 100%);
        border-radius: 15px;
        padding: 5px 15px;
        margin-right: 10px;
    }
    .back:hover, .exit:hover {
        background-image: linear-gradient(-45deg, #4cccfe 0%, #4de0ff 100%);
    }
    .exit {
      display: none;
    }
    .errCode {
        margin-top: 10px;
        opacity: 0.6;
        font-family: PingFangSC-Regular;
        font-size: 14px;
        color: #FFFFFF;
    }
    .back a, .exit a {
        font-size: 14px;
        color:#fff;
        font-family: PingFangSC-Medium;
    }
    .idea {
        padding: 5px 15px;
        background-color: #28292A;
        border-radius: 15px;
    }
    .uos .idea, .uos .back {
      display: none;
    }
    .uos .exit {
      display: block;
    }
    .idea:hover {
         background-color: rgba(255,255,255,0.2);

    }
    .idea a {
        font-family: PingFangSC-Medium;
        font-size: 14px;
        color: rgba(255,255,255,0.60);
    }
    .hotSearch {
        position: absolute;
        left: 50%;
        transform: translate(-50%, 0);
        bottom: 30px;
        /* overflow: hidden; */
    }
    .hotSearch .header {
        display: flex;
        align-items: center;
    }
    .hotSearchBtnContainer {
        display: flex;
    }
    .hotSearch .title {
        opacity: 0.87;
        font-family: PingFangSC-Regular;
        font-size: 26px;
        color: #FFFFFF;
    }
    .hotSearch .hotSearchBtn {
        height: 28px;
        line-height: 28px;
        opacity: 0.7;
        background: #323335;
        border-radius: 16px;
        font-size: 14px;
        color: #FFFFFF;
        text-align: center;
        padding: 0 14px;
        margin-left: 15px;
    }
    .active {
        background: linear-gradient(-45deg, #00D3FF 0%, #00B7FF 100%) !important;
        opacity: 1 !important;
    }
    .hotSearchContent {
        display: flex;
        margin-top: 15px;
    }
    #mask {
        position: absolute;
        width: 36px;
        height: 36px;
        left: 0;
        top: 0;
    }
    .position {
        position: absolute;
        left: 5px;
        top: 4px;
    }
    .layer {
        width: 210px;
        height: 117px;
        background-color: #333;
    }
    .hotSearchContent img {
        width: 100%;
        height: 100%;
        border-radius: 4px;
    }
    .hotSearchItem:hover {
        transition: transform .25s ease-in-out,-webkit-transform .25s ease-in-out;
        -webkit-transform: scale(1.01);
        transform: scale(1.01);
    }
    .hotSearchItem {
        position: relative;
        margin-right: 12px;
    }
    .videoTitle {
        margin-top: 5px;
        opacity: 0.87;
        font-family: PingFangSC-Regular;
        font-size: 16px;
        color: #FFFFFF;
        letter-spacing: 0;
    }
    .videoTitle:hover {
        color: rgb(34,141,252)
    }
    
@media (max-width: 1239px) {
    .hotSearch {
        width: 960px;
    }
    .hotSearchItem:nth-child(7) {
        display: none
    }
    .hotSearchItem:nth-child(6) {
        display: none
    }
    .hotSearchItem:nth-child(8) {
        display: none
    }
    .layer {
        width: 180px;
    }
}

@media (min-width: 1240px) and (max-width: 1329px) {
    .hotSearch {
        width: 1140px;
    }
    .hotSearchItem:nth-child(7) {
        display: none
    }
    .hotSearchItem:nth-child(8) {
        display: none
    }
    .layer {
        width: 180px;
    }
   
}

@media (min-width: 1330px) and (max-width: 1591px) {
    .hotSearch {
        width: 1230px;
    }
    .hotSearchItem:nth-child(8) {
        display: none
    }
    .hotSearchItem:nth-child(7) {
        display: none
    }
    .layer {
        width: 195px;
    }
   
}

@media (min-width: 1592px) and (max-width: 1789px) {
    .hotSearch {
        width: 1544px;
    }
    .hotSearchItem:nth-child(8) {
        display: none
    }
    .layer {
        width: 210px;
    }
   
}

@media (min-width: 1790px) {
    .hotSearch {
        width: 1764px;
    }
    .layer {
        width: 210px;
    }
    
}
  </style>

  
  
</head>
<body ontouchstart=""><script>
with(document)with(body)with(insertBefore(createElement("script"),firstChild))setAttribute("exparams","userid=&aplus&sidx=0&ckx=|",id="beacon-aplus",src="//g.alicdn.com/alilog/mlog/aplus_o.js")
</script>
  <div id="youkuheader"></div>
  <div id="root">
    <div class="center">
        <img src="//gw.alicdn.com/tfs/TB13pB_dJTfau8jSZFwXXX1mVXa-1-1.png" alt="" class="logo404">
        <div class="content">
            <div class="contentTitle"></div>
            <div class="errCode">错误码：</div>
            <div class="btnContainer">
                <div class="back"><a target="_blank" href="https://youku.com">返回首页</a></div>
                <div class="idea"><a target="_blank" href="https://t.youku.com/yep/page/pc/youkukefu?isNeedBaseImage=1">意见反馈</a></div>
                <div class="exit"><a href="javascript:void(0);">关闭页面</a></div>
            </div>
        </div>
    </div>
    <!--<div class="hotSearch">-->
    <!--    <div class="header">-->
    <!--          <div class="title">今日热搜榜</div>-->
    <!--          <div class="hotSearchBtnContainer">-->
    <!--              <div class="hotSearchBtn active">剧集</div>-->
    <!--              <div class="hotSearchBtn">综艺</div>-->
    <!--              <div class="hotSearchBtn">电影</div>-->
    <!--              <div class="hotSearchBtn">动漫</div>-->
    <!--          </div>-->
    <!--    </div>-->
    <!--    <div class="hotSearchContent">-->
           
    <!--    </div>-->
    <!--</div>-->
  </div>
   <div id="fixbar"></div>
        <div id="youkufooter">
  </div>
  <script src="//g.alicdn.com/hollywood/hollywood-lib/2.0.2/??promise.js,mtop.js"></script>
  <script src="//gw.alicdn.com/bao/uploaded/TB1R8mExKL2gK0jSZPhXXahvXXa.js"></script>
  <script>
      window.pageConfig = {"urlInvaild":{"code":"请输入正确地址","title":"抱歉，您当前访问的地址不合法","img":"//gw.alicdn.com/tfs/TB1694HRHY1gK0jSZTEXXXDQVXa-400-400.png"},"targetNotFound":{"code":"请查找其他资源观看","title":"抱歉，您当前访问的视频不存在","img":"//gw.alicdn.com/tfs/TB1694HRHY1gK0jSZTEXXXDQVXa-400-400.png"},"videoLimited":{"code":"请查找其他视频观看","title":"抱歉，您访问的视频版权受限暂无可播源","img":"//gw.alicdn.com/tfs/TB19MF1RUT1gK0jSZFrXXcNCXXa-400-400.png"},"serverError":{"code":"请您稍后重试","title":"啊哦，系统开小差了","img":"//gw.alicdn.com/tfs/TB1694HRHY1gK0jSZTEXXXDQVXa-400-400.png"},"didInit":true};
         
      var mtopConfig = {
            appKey: '24679788',
            v: '2.0',
            ecode: 0,
            type: 'GET',
            dataType: 'json',
        }
        var mtop = window.lib.mtop
        mtop.config.prefix = 'acs' // 当前是预发环境
        mtop.config.subDomain = ''
        mtop.config.mainDomain = 'youku.com'
        var ua = navigator.userAgent
        var UOSMode = !!(ua && (/UOSYouku/i.test(ua)))
        if (UOSMode) {
          document.querySelector('html').classList.add('uos')
        }
        if (window.$$InitYoukuHeader && window.$$InitYouKuFooter && window.$$InitYoukuFixedBar && !UOSMode) {
            window.$$InitYoukuHeader('youkuheader', {
                currentChannel: { name: '', domain: '' },
                focusWhite: false,
                enableScroll: true
            });

            window.$$InitYouKuFooter('youkufooter', {});

            window.$$InitYoukuFixedBar('fixbar', {});
        }
        var getPar

sitemap.xml 200 OK

Type URL Set URLs 51 entries Valid XML Yes

Sample URLs:

A+

URL Variants

www/non-www, trailing slash, HTTP→HTTPS

PASS

www/non-www, trailing slash, HTTP→HTTPS

www/non-www redirect configured correctly (preferred: non-www)

HTTP correctly 301-redirects to HTTPS

www / non-www

302https://www.youku.com/

200https://youku.com/

Preferred variant: non-www

HTTP → HTTPS

301http://youku.com/ → https://youku.com/

Consistent

A+

Domain Intelligence

youku.com — via Alibaba Cloud Computing (Beijing) Co., Ltd., 22 years, 7 months old

PASS

youku.com — via Alibaba Cloud Computing (Beijing) Co., Ltd., 22 years, 7 months old

Domain registered until Dec 22, 2026 (8 months remaining)

DNSSEC is not enabled

DNSSEC protects against DNS spoofing attacks. While not required, enabling DNSSEC adds an additional layer of security. Contact your DNS provider to enable it.

Registrar: Alibaba Cloud Computing (Beijing) Co., Ltd.

Registrar lock is NOT enabled

The domain can be transferred without an unlock step. Enable registrar lock (clientTransferProhibited) in your registrar's control panel to protect against unauthorized or accidental transfers.

Domain expiry

189 days

December 22, 2026

SSL certificate

304 days

Issued by GlobalSign nv-sa

Domain age

22 years, 7 months

Registered December 22, 2003

DNSSEC

Not enabled

Protects against DNS spoofing

Hosting

Unknown

2408:4001:f10::fd

Registrar

Alibaba Cloud Computing (Beijing) Co., Ltd.

Unlocked 4 NS records

Expiry timeline

Today

+1 year

Domain expiry SSL expiry Danger zone (≤30 days)

Recommended actions

Enable DNSSEC to protect visitors from DNS spoofing
Enable registrar lock (clientTransferProhibited) to block unauthorized domain transfers

Registrar Alibaba Cloud Computing (Beijing) Co., Ltd.

Created December 22, 2003 (22 years, 7 months ago)

Expires December 22, 2026 (8 months)

Last Updated December 22, 2025

Name Servers dns1.youku.com, dns2.youku.com, dns3.youku.com, dns4.youku.com

DNSSEC Not enabled

Hosting

IP Address 2408:4001:f10::fd

Data source: rdap (0.0s)

DNSSEC protects against DNS spoofing attacks. While not required, enabling DNSSEC adds an additional layer of security. Contact your DNS provider to enable it.

Why this matters

Without DNSSEC, an attacker who can poison your DNS can hijack your domain — and SSL certs alone don't stop them.

Learn more ▾

DNSSEC adds cryptographic signatures to DNS records, preventing forged responses from poisoning resolver caches. Without it, an attacker who controls the network path can redirect your domain to a malicious server before any HTTPS handshake happens. Most modern registrars (Cloudflare, Google Domains, Route 53) enable it with one toggle.

Source: ICANN / RFC 4033

The domain can be transferred without an unlock step. Enable registrar lock (clientTransferProhibited) in your registrar's control panel to protect against unauthorized or accidental transfers.

Why this matters

Without registrar lock, an attacker who phishes your registrar credentials can transfer the domain in minutes — total brand hijack.

Learn more ▾

Registrar lock (clientTransferProhibited, clientUpdateProhibited, clientDeleteProhibited) requires extra verification before any transfer/update/delete. Every major registrar offers it free. Combined with 2FA on your registrar account, it's the strongest defense against domain hijacking.

Source: ICANN / domain-security best practice

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.