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https://dangdang.com

Infrastructure

· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.
SCORE
74
GRADE
C
FIX
2
REVIEW
5
PASS
2
INFO
0
Probed from Singapore, Singapore
301 Moved Permanently
Checks
9
2 PASS 5 REVIEW 2 FIX
D
URL Variants
Action
www/non-www, trailing slash, HTTP→HTTPS
FIX
www/non-www, trailing slash, HTTP→HTTPS
Critical::
Both www and non-www versions serve content
Got: Both variants return 200 Expected: One variant 301-redirects to the other
Critical::
HTTP version does not redirect to HTTPS
Got: HTTP 301 Expected: 301 redirect to HTTPS

www / non-www

200https://www.dangdang.com/
200https://dangdang.com/

Inconsistent — duplicate content risk

HTTP → HTTPS

301http://dangdang.com/ → http://www.dangdang.com/

HTTP version does not redirect to HTTPS

D
CDN & Delivery
Action
No CDN detected
FIX
No CDN detected
Warning::
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.

B
Redirect Chain
1 redirect(s), 1932 ms total
REVIEW
1 redirect(s), 1932 ms total
Info::
Single redirect
Got: https://dangdang.com → http://www.dangdang.com/ (301)
Info::
WWW normalization redirect
Warning::
Redirect overhead: 1932 ms total
Got: 1932 ms

https://dangdang.com

1075 ms · HTTP/1.1

301

http://www.dangdang.com/

857 ms · HTTP/1.1 FINAL

#URLStatusTimeProtocolServer
1https://dangdang.com3011075 msHTTP/1.1
2http://www.dangdang.com/200857 msHTTP/1.1TencentEdgeOne

See the visual redirect chain in the HTTP Probe tab →

C
IPv6 Readiness
Action
No IPv6 support
REVIEW
No IPv6 support
Info::
No IPv6 (AAAA) records found
IPv6 support is increasingly important for global accessibility. About 40% of internet users have IPv6 connectivity.
No IPv6 Support
About 40% of internet users have IPv6. Consider adding AAAA records.

IPv6 support is increasingly important for global accessibility. About 40% of internet users have IPv6 connectivity.

Why this matters

No AAAA records — same impact as 'no IPv6 (AAAA) records'; IPv6-preferring clients pay extra latency falling back to IPv4.

Source: Google IPv6 stats

C
Crawlability
Action
robots.txt present, sitemap with 0 URLs
REVIEW
robots.txt present, sitemap with 0 URLs
Info::
robots.txt is present
Got: 10240 bytes
Info::
sitemap.xml is present
Warning::
sitemap.xml contains invalid XML
Search engines may not be able to parse the sitemap. Fix XML validation errors.
Warning::
sitemap.xml is empty — no URLs found
An empty sitemap provides no value. Add <url> entries for your pages.
Info::
robots.txt does not reference a sitemap
Add a 'Sitemap:' directive to robots.txt so search engines can discover your sitemap.

Search engines may not be able to parse the sitemap. Fix XML validation errors.

Why this matters

An unparseable sitemap is silently ignored by Google — the URLs it advertises are never queued for crawl.

Learn more ▾

Google's sitemap parser is strict about XML validity. A single unescaped `&` or unclosed tag invalidates the whole file. Run your sitemap through a validator (Search Console's Sitemaps report flags it) and fix the offending entry. Most generators escape correctly; mistakes usually come from manually-written entries.

Source: sitemaps.org / Google Search Central

An empty sitemap provides no value. Add <url> entries for your pages.

Why this matters

An empty sitemap signals 'no content to index' to Google — actively harmful versus having no sitemap at all.

Learn more ▾

Google compares URLs in the sitemap against URLs it has crawled. An empty sitemap on a site with thousands of pages signals abandonment. Either populate it correctly (most CMSes auto-generate) or delete the file and let Google crawl normally.

Source: Google Search Central / sitemaps.org

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 PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
        <title>�Բ�������Ҫ���ʵ�ҳ����ʱû���ҵ���</title>
        <!--<link href="/static/style/notfound404.css?140805" rel="stylesheet" type="text/css" />
        <script type="text/javascript" src="/Found/pagetop_2012.js?0419"></script>
        <script type="text/javascript" src="/static/script/jquery-1.4.2.min.js"></script>-->
       
        <script type="text/javascript" src="http://img13.ddimg.cn/mix/js/jquery.js"></script>

        <style>
            html{font-family:"Microsoft YaHei","Simsun";font-size:12px;}
            body,h1,h2,h3,h4,h5,h6,p,ol,ul,dl,dd,td,th,form,input,select,textarea{margin:0;padding:0;color:#333;}
            a{text-decoration:none;outline:none;}
            img{border:none;vertical-align:top;}
            li{list-style:none;}
            .clearfix:after {clear:both;content:" ";display:block;font-size:0;height:0;visibility:hidden}
            .clearfix {zoom:1}

            .null_wrap{width:1200px;margin:0 auto;background:#fff;overflow:hidden;}
            .null_pic{width:320px;height:227px;margin:0 auto;padding:25px 0 0 480px; background:url(http://img60.ddimg.cn/upload_img/00111/404/error_01.jpg) no-repeat 0 25px; overflow:hidden;}
            .null_pic .title{font:14px/24px "Microsoft YaHei";color:#888;padding:40px 0 15px;}
            .null_pic .btn{overflow:hidden;}
            .null_pic .btn a,.null_pic .btn a:hover{float:left;height:38px;font:18px/36px "Microsoft YaHei";padding:0 20px;background:#ff2832;text-decoration:none;color:#fff;text-align:center;border-radius:3px;margin-right:20px;overflow:hidden;_display:inline;}
            .null_pic .btn a:hover{background:#f00000;}

            .my_ads { border:1px solid #dcdcdc; margin-bottom:15px;width:1198px; overflow:hidden;}
            .ads_tab {line-height:40px;height:40px;padding-left:20px;}
            .ads_tab li a,.ads_tab li a:hover{ color:#323232; padding:0 3px; font:18px/40px "Microsoft YaHei";height:40px;float:left;}
            .show_list .arrow { position:absolute; width:34px; height:70px; background-image:url(http://img60.ddimg.cn/upload_img/00111/404/arrow_ad.png); top:50%; margin-top:-53px; opacity:0.8; filter:alpha(opacity=80);}
            .show_list .arrow:hover { opacity:1; filter:alpha(opacity=100);}
            .show_list .left {left:0;background-position:0 -112px;}
            .show_list .right { right:0; background-position:-34px -112px;}
            .show_list .unable, .show_list .unable:hover {opacity:0.3; filter:alpha(opacity=30); cursor:default;}
            .my_ads .ads_box{clear:both;width:1198px; margin:0 auto; overflow:hidden;background: url("http://img63.ddimg.cn/upload_img/00111/gg/guanggao02.png") no-repeat 1171px 291px;padding-bottom: 18px;}
            .show_list { position:relative;width:1194px;padding:0 2px; overflow:hidden}
            .show_box li .gpic { display:inline-block; width:150px; height:150px; margin:10px 0;}
            .show_box li .sale { background-color:#ff2832; color:#fff; display:inline-block; padding:0 2px; margin:0 0 0 8px;}
            .my_ads .show_box { width:10000px;overflow:hidden;padding:0 0 10px;}
            .my_ads .show_box .hid{ display: none;}
            .my_ads .show_box li {width:150px; border:none 0;height:280px;padding:0 24px 0 25px; text-align:center; float:left; color:#323232; line-height:16px;}
            
            .my_ads .show_box li:hover { background-color:#f9f9f9;}
            .my_ads .show_box li a { color:#323232;}
            .my_ads .show_box li a:hover { color:#ff2832;}
            .my_ads .show_box li p { text-align:left; line-height:14px; width:150px; height:28px; overflow:hidden;}
            .my_ads .show_box li p .price { font-size:16px; color:#ff2832; line-height:32px;}
            .my_ads .show_box li .btn_add,.my_ads .show_box li .btn_add:hover{ width:150px; margin-top:6px; height:32px; display:block; background-color:#ff2832; color:#fff; text-align:center; border-radius:2px; font:14px/32px "Microsoft Yahei";}
            .my_ads .show_box li .btn_add:hover { color:#fff; background-color:#d21f2b;}
        </style>
    </head>
    <body>
        <script>var accessbilityUrl = "//static.dangdang.com/fed/accessbility/1.0.0/accessbility.min.js";var accessbilitySwitch = "1";</script>
<script type="text/javascript" defer="" async="" src="//static.dangdang.com/js/header2012/pagetop_accessbility.min.js?v=20230626" ></script><script type="text/javascript">
    </script>
<link href="//static.dangdang.com/css/header2012/header_150803.css?20211105" rel="stylesheet" type="text/css">
<script charset="gb2312" type="text/javascript">var width = 1; narrow = 0;</script>
<script src="//static.dangdang.com/js/header2012/pagetop2015_0827.js?20211105" charset="gb2312" type="text/javascript"></script>
<script src="//static.dangdang.com/js/header2012/dd.menu-aim.js?20211105" charset="gb2312" type="text/javascript"></script>


<div id="hd">
<div id="tools">
  <div class="tools">
    <div class="ddnewhead_operate" dd_name="������">
      <div class="ddnewhead_area">
        <a href="javascript:void(0);" id="area_one" class="ddnewhead_area_a" onmouseover="show_area_list();"
          onmouseout="hidden_area_list();">������<span id="curent_area"></span></a>
        <ul class="ddnewhead_area_list" style="display: none;" id="area_list" onmouseover="this.style.display='block';"
          onmouseout="this.style.display='none';">
          <li><a href="javascript:void(0);" onclick="change_area('111','����')" num="111">����</a></li>
          <li><a href="javascript:void(0);" onclick="change_area('112','����')" num="112">����</a></li>
          <li><a href="javascript:void(0);" onclick="change_area('113','�ӱ�')" num="113">�ӱ�</a></li>
          <li><a href="javascript:void(0);" onclick="change_area('114','ɽ��')" num="114">ɽ��</a></li>
          <li><a href="javascript:void(0);" onclick="change_area('115','���ɹ�')" num="115">���ɹ�</a></li>
          <li><a href="javascript:void(0);" onclick="change_area('121','����')" num="121">����</a></li>
          <li><a href="javascript:void(0);" onclick="change_area('122','����')" num="122">����</a></li>
          <li><a href="javascript:void(0);" onclick="change_area('123','������')" num="123">������</a></li>
          <li><a href="javascript:void(0);" onclick="change_area('131','�Ϻ�')" num="131">�Ϻ�</a></li>
          <li><a href="javascript:void(0);" onclick="change_area('132','����')" num="132">����</a></li>
          <li><a href="javascript:void(0);" onclick="change_area('133','�㽭')" num="133">�㽭</a></li>
          <li><a href="javascript:void(0);" onclick="change_area('134','����')" num="134">����</a></li>
          <li><a href="javascript:void(0);" onclick="change_area('135','����')" num="135">����</a></li>
          <li><a href="javascript:void(0);" onclick="change_area('136','����')" num="136">����</a></li>
          <li><a href="javascript:void(0);" onclick="change_area('137','ɽ��')" num="137">ɽ��</a></li>
          <li><a href="javascript:void(0);" onclick="change_area('141','����')" num="141">����</a></li>
          <li><a href="javascript:void(0);" onclick="change_area('142','����')" num="142">����</a></li>
          <li><a href="javascript:void(0);" onclick="change_area('143','����')" num="143">����</a></li>
          <li><a href="javascript:void(0);" onclick="change_area('144','�㶫')" num="144">�㶫</a></li>
          <li><a href="javascript:void(0);" onclick="change_area('145','����')" num="145">����</a></li>
          <li><a href="javascript:void(0);" onclick="change_area('146','����')" num="146">����</a></li>
          <li><a href="javascript:void(0);" onclick="change_area('150','����')" num="150">����</a></li>
          <li><a href="javascript:void(0);" onclick="change_area('151','�Ĵ�')" num="151">�Ĵ�</a></li>
          <li><a href="javascript:void(0);" onclick="change_area('152','����')" num="152">����</a></li>
          <li><a href="javascript:void(0);" onclick="change_area('153','����')" num="153">����</a></li>
          <li><a href="javascript:void(0);" onclick="change_area('154','����')" num="154">����</a></li>
          <li><a href="javascript:void(0);" onclick="change_area('161','����')" num="161">����</a></li>
          <li><a href="javascript:void(0);" onclick="change_area('162','����')" num="162">����</a></li>
          <li><a href="javascript:void(0);" onclick="change_area('163','�ຣ')" num="163">�ຣ</a></li>
          <li><a href="javascript:void(0);" onclick="change_area('164','����')" num="164">����</a></li>
          <li><a href="javascript:void(0);" onclick="change_area('165','�½�')" num="165">�½�</a></li>
          <li><a href="javascript:void(0);" onclick="change_area('171','̨��')" num="171">̨��</a></li>
          <li><a href="javascript:void(0);" onclick="change_area('172','����')" num="172">����</a></li>
          <li><a href="javascript:void(0);" onclick="change_area('173','����')" num="173">����</a></li>
          <li><a href="javascript:void(0);" onclick="change_area('174','���㵺')" num="174">���㵺</a></li>
        </ul>
      </div>

      <div style="float:right">
        <div class="ddnewhead_welcome" display="none;" style="float:left">
          <span id="nickname"><span class="hi hi_none">��ӭ���ٵ�������</span><a
              href="https://login.dangdang.com/signin.aspx?returnurl=http%3A//www.dangdang.com/"
              class="login_link">��¼</a><a href="https://login.dangdang.com/Register.aspx">����ע��</a></span>
          <div class="tel_pop" style="display:none" id="__ddnav_sjdd"
            onmouseover="showgaoji('a_phonechannel','__ddnav_sjdd');"
            onmouseout="hideotherchannel('a_phonechannel','__ddnav_sjdd');">
            <a target="_blank" href="http://t.dangdang.com/20130220_ydmr" class="title"><i
                class="icon_tel"></i>�ֻ�����</a><i class="title_shadow"></i>
            <ul class="tel_pop_box">
              <li><a href="http://
sitemap.xml 200 OK
Type URL Set URLs 0 entries Valid XML No
B
HTTP Probe Timing
Total 1002 ms — DNS, TCP, TLS, TTFB, content transfer breakdown
REVIEW
DNS Lookup DNS Lookup — time to resolve the domain name to an IP address.
71 ms
TCP Connect TCP Connect — time to establish a TCP connection to the server.
227 ms
TLS Handshake TLS Handshake — time to complete the HTTPS encryption handshake.
471 ms
Time to First Byte Time to First Byte — how long the server takes to respond with the first byte of data.
1.00 s
Total Time Total request time from DNS lookup through full response.
1.00 s

Connection waterfall

DNS Lookup 71 ms TCP Connect 227 ms TLS Handshake 471 ms Server Processing 234 ms Content Transfer 0 ms
B
TLS Certificate Expiry & Recommendations
36 days until leaf cert expires — 4 issues to address
REVIEW

Certificate validity

36
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
  • Enable HSTS: Strict-Transport-Security: max-age=31536000; includeSubDomains
  • 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
2 A records, 141 ms lookup
PASS
2 A records, 141 ms lookup
Info::
Resolves to 2 IPv4 address(es)
Got: 39.101.91.100, 39.101.89.100
Info::
No IPv6 (AAAA) records
Info::
4 nameserver(s) configured
Got: dns3.hichina.com, ns1.volcengine-dns.com, dns4.hichina.com, ns2.volcengine-dns.com
Info::
1 mail exchanger(s) configured
Info::
CAA records not checked
CAA record lookup requires a specialized DNS resolver. This check will be available in a future update.
Info::
SPF record present in TXT
Info::
DNS resolution time: 141 ms
Got: 141 ms
A39.101.91.100, 39.101.89.100
AAAA—
CNAME—
NSdns3.hichina.com, ns1.volcengine-dns.com, dns4.hichina.com, ns2.volcengine-dns.com
MX
1 ddgw.mail2relay.com
TXT
SPF v=spf1 ip4:219.142.192.150/32 ip4:111.207.228.126/32 ip4:221.122.85.0/24 ip4:119...
CAALookup not available with standard resolver
Resolved in 141 ms

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+
Domain Intelligence
dangdang.com — via Alibaba Cloud Computing (Beijing) Co., Ltd., 27 years, 1 months old, hosted on Alibaba Cloud
PASS
dangdang.com — via Alibaba Cloud Computing (Beijing) Co., Ltd., 27 years, 1 months old, hosted on Alibaba Cloud
Info::
Domain registered until Aug 9, 2026 (3 months remaining)
Info::
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.
Info::
Registrar: Alibaba Cloud Computing (Beijing) Co., Ltd.
Warning::
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.
Info::
Hosting: Alibaba Cloud
Got: AS37963
Domain expiry

24 days

August 9, 2026

SSL certificate

36 days

Issued by DigiCert, Inc.

Domain age

27 years, 1 months

Registered August 9, 1999

DNSSEC

Not enabled

Protects against DNS spoofing

Hosting

Alibaba Cloud

ASN AS37963

39.101.91.100

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
  • Renew the domain or enable auto-renewal to prevent accidental expiry
  • 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 August 9, 1999 (27 years, 1 months ago)
Expires August 9, 2026 (3 months)
Last Updated November 4, 2025
Name Servers dns3.hichina.com, dns4.hichina.com, ns1.volcengine-dns.com, ns2.volcengine-dns.com
DNSSEC Not enabled
Hosting
IP Address 39.101.91.100
ASN AS37963 (ALIBABA-CN-NET Hangzhou Alibaba Advertising Co.,Ltd., CN)
Provider Alibaba Cloud
Data source: rdap (1.1s)

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.

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