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https://sina.cn

Infrastructure

· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.
SCORE
86
GRADE
B
FIX
2
REVIEW
3
PASS
4
INFO
0
Probed from Madrid, Spain
200 OK
Checks
9
4 PASS 3 REVIEW 2 FIX
F
HTTP Probe Timing
Action
Total 7173 ms — DNS, TCP, TLS, TTFB, content transfer breakdown
FIX
DNS Lookup DNS Lookup — time to resolve the domain name to an IP address.
328 ms
TCP Connect TCP Connect — time to establish a TCP connection to the server.
457 ms
TLS Handshake TLS Handshake — time to complete the HTTPS encryption handshake.
3.48 s
Time to First Byte Time to First Byte — how long the server takes to respond with the first byte of data.
5.34 s
Total Time Total request time from DNS lookup through full response.
7.17 s

Connection waterfall

DNS Lookup 328 ms TCP Connect 457 ms TLS Handshake 3.48 s Server Processing 1.07 s Content Transfer 1.84 s
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.

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

B
URL Variants
www/non-www, trailing slash, HTTP→HTTPS
REVIEW
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
Info::
HTTP correctly 301-redirects to HTTPS

www / non-www

200https://www.sina.cn/
200https://sina.cn/

Inconsistent — duplicate content risk

HTTP → HTTPS

301http://sina.cn/ → https://sina.cn/

Consistent

B
TLS Certificate Expiry & Recommendations
253 days until leaf cert expires — 5 issues to address
REVIEW

Certificate validity

253
days left
0d 30d 60d 90d+

Recommended actions

  • Extend HSTS max-age to at least 31536000 (1 year) to meet the preload list criteria
  • 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, 317 ms lookup
PASS
1 A records, 317 ms lookup
Info::
Resolves to 1 IPv4 address(es)
Got: 36.51.254.90
Info::
Single A record — no DNS redundancy
Multiple A records provide failover if one server goes down.
Info::
No IPv6 (AAAA) records
Info::
3 nameserver(s) configured
Got: ns2.sina.com.cn, ns1.sina.com.cn, ns3.sina.com.cn
Info::
3 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
Warning::
DNS resolution is slow (317 ms)
Slow DNS adds latency to every page load. Consider a faster DNS provider.
Got: 317 ms
A36.51.254.90
AAAA—
CNAME—
NSns2.sina.com.cn, ns1.sina.com.cn, ns3.sina.com.cn
MX
10 freemx1.sinamail.sina.com.cn
10 freemx2.sinamail.sina.com.cn
10 freemx3.sinamail.sina.com.cn
TXT
SPF v=spf1 include:spf.sinamail.sina.com.cn -all
CAALookup not available with standard resolver
Resolved in 317 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.

Slow DNS adds latency to every page load. Consider a faster DNS provider.

Why this matters

DNS resolution is slow — anycast DNS providers (Cloudflare, Route 53) typically resolve <50ms globally.

Source: DNS performance benchmarks

A+
Redirect Chain
No redirects — direct access
PASS
No redirects — direct access
Info::
No redirects — direct access
Got: https://sina.cn

https://sina.cn

3887 ms · HTTP/1.1 FINAL

#URLStatusTimeProtocolServer
1https://sina.cn2003887 msHTTP/1.1nginx
A+
Crawlability
robots.txt present, sitemap with 13 URLs
PASS
robots.txt present, sitemap with 13 URLs
Info::
robots.txt is present
Got: 65 bytes
Info::
sitemap.xml is present
Info::
sitemap.xml is valid XML
Info::
sitemap.xml contains 13 entries
Info::
Sitemap index with 13 child sitemaps
Info::
robots.txt references sitemap
robots.txt 200 OK
Size 65 B Sitemaps referenced 1 User-agents * Blocking No — crawling allowed
User-agent: *
Allow: /
Sitemap: https://sina.cn/sitemap/index.xml
sitemap.xml 200 OK
Type Sitemap Index URLs 13 entries Valid XML Yes
Child Sitemaps:
A+
Domain Intelligence
sina.cn — via 北京国科云计算技术有限公司（原北京中科三方网络技术有限公司）, 23 years, 5 months old, hosted on SINA 15F,Ideal Plaza No.58 Bei Si Huan Xi Road, CN
PASS
sina.cn — via 北京国科云计算技术有限公司（原北京中科三方网络技术有限公司）, 23 years, 5 months old, hosted on SINA 15F,Ideal Plaza No.58 Bei Si Huan Xi Road, CN
Info::
Domain registered until Mar 17, 2027 (10 months remaining)
Info::
Registrar: 北京国科云计算技术有限公司（原北京中科三方网络技术有限公司）
Info::
Registrar lock is enabled
Domain cannot be transferred without explicit unlock from the registrar. This protects against unauthorized transfers.
Info::
Hosting: SINA 15F,Ideal Plaza No.58 Bei Si Huan Xi Road, CN
Got: AS37936
Domain expiry

274 days

March 17, 2027

SSL certificate

253 days

Issued by DigiCert, Inc.

Domain age

23 years, 5 months

Registered March 17, 2003

DNSSEC

Status unknown

Protects against DNS spoofing

Hosting

SINA 15F,Ideal Plaza No.58 Bei Si Huan Xi Road, CN

ASN AS37936

36.51.254.90

Registrar

北京国科云计算技术有限公司（原北京中科三方网络技术有限公司）

Locked 2 NS records
Expiry timeline
Today
+1 year
Domain expiry SSL expiry Danger zone (≤30 days)
Registrar 北京国科云计算技术有限公司（原北京中科三方网络技术有限公司）
Created March 17, 2003 (23 years, 5 months ago)
Expires March 17, 2027 (10 months)
Name Servers ns3.sina.com.cn, ns2.sina.com.cn
Hosting
IP Address 36.51.254.90
ASN AS37936 (SINA 15F,Ideal Plaza No.58 Bei Si Huan Xi Road, CN)
Provider SINA 15F,Ideal Plaza No.58 Bei Si Huan Xi Road, CN
Data source: whois (1.2s)

Domain cannot be transferred without explicit unlock from the registrar. This protects against unauthorized transfers.

Why this matters

Registrar lock (clientTransferProhibited et al.) prevents unauthorized domain transfers — 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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