Skip to content
https://sina.com.cn

Infrastructure

· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.
SCORE
81
GRADE
B
FIX
1
REVIEW
5
PASS
3
INFO
0
Probed from New York, United Stated
301 Moved Permanently
Checks
9
3 PASS 5 REVIEW 1 FIX
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), 1093 ms total
REVIEW
1 redirect(s), 1093 ms total
Info::
Single redirect
Got: https://sina.com.cn → https://www.sina.com.cn/ (301)
Info::
WWW normalization redirect
Warning::
Redirect overhead: 1093 ms total
Got: 1093 ms

https://sina.com.cn

636 ms · HTTP/1.1

301

https://www.sina.com.cn/

457 ms · HTTP/1.1 FINAL

#URLStatusTimeProtocolServer
1https://sina.com.cn301636 msHTTP/1.1nginx
2https://www.sina.com.cn/200457 msHTTP/1.1Tengine

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

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.com.cn/
200https://sina.com.cn/

Inconsistent — duplicate content risk

HTTP → HTTPS

301http://sina.com.cn/ → https://www.sina.com.cn/

Consistent

B
HTTP Probe Timing
Total 890 ms — DNS, TCP, TLS, TTFB, content transfer breakdown
REVIEW
DNS Lookup DNS Lookup — time to resolve the domain name to an IP address.
266 ms
TCP Connect TCP Connect — time to establish a TCP connection to the server.
208 ms
TLS Handshake TLS Handshake — time to complete the HTTPS encryption handshake.
209 ms
Time to First Byte Time to First Byte — how long the server takes to respond with the first byte of data.
891 ms
Total Time Total request time from DNS lookup through full response.
891 ms

Connection waterfall

DNS Lookup 266 ms TCP Connect 208 ms TLS Handshake 209 ms Server Processing 208 ms Content Transfer 0 ms
B
TLS Certificate Expiry & Recommendations
258 days until leaf cert expires — 3 issues to address
REVIEW

Certificate validity

258
days left
0d 30d 60d 90d+

Recommended actions

  • 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
1 A records, 215 ms lookup
PASS
1 A records, 215 ms lookup
Info::
Resolves to 1 IPv4 address(es)
Got: 36.51.254.91
Info::
Single A record — no DNS redundancy
Multiple A records provide failover if one server goes down.
Info::
No IPv6 (AAAA) records
Info::
4 nameserver(s) configured
Got: ns1.sina.com.cn, ns3.sina.com.cn, ns2.sina.com.cn, ns4.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 (215 ms)
Slow DNS adds latency to every page load. Consider a faster DNS provider.
Got: 215 ms
A36.51.254.91
AAAA—
CNAME—
NSns1.sina.com.cn, ns3.sina.com.cn, ns2.sina.com.cn, ns4.sina.com.cn
MX
10 freemx2.sinamail.sina.com.cn
10 freemx3.sinamail.sina.com.cn
10 freemx1.sinamail.sina.com.cn
TXT
SPF v=spf1 include:spf.sinamail.sina.com.cn -all
CAALookup not available with standard resolver
Resolved in 215 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+
Crawlability
robots.txt present, sitemap with 10 URLs
PASS
robots.txt present, sitemap with 10 URLs
Info::
robots.txt is present
Got: 73 bytes
Info::
sitemap.xml is present
Info::
sitemap.xml is valid XML
Info::
sitemap.xml contains 10 entries
Info::
Sitemap index with 10 child sitemaps
Info::
robots.txt references sitemap
robots.txt 200 OK
Size 73 B Sitemaps referenced 1 User-agents * Blocking No — crawling allowed
User-agent: *
Allow: /
Sitemap: https://www.sina.com.cn/sitemap/index.xml
sitemap.xml 200 OK
Type Sitemap Index URLs 10 entries Valid XML Yes
Child Sitemaps:
A+
Domain Intelligence
sina.com.cn — via 北京新网数码信息技术有限公司, 27 years, 9 months old, hosted on SINA 15F,Ideal Plaza No.58 Bei Si Huan Xi Road, CN
PASS
sina.com.cn — via 北京新网数码信息技术有限公司, 27 years, 9 months old, hosted on SINA 15F,Ideal Plaza No.58 Bei Si Huan Xi Road, CN
Info::
Domain registered until Dec 4, 2030 (4 years, 8 months remaining)
Info::
Registrar: 北京新网数码信息技术有限公司
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

1605 days

December 4, 2030

SSL certificate

258 days

Issued by DigiCert, Inc.

Domain age

27 years, 9 months

Registered November 20, 1998

DNSSEC

Status unknown

Protects against DNS spoofing

Hosting

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

ASN AS37936

36.51.254.91

Registrar

北京新网数码信息技术有限公司

Locked 4 NS records
Expiry timeline
Today
+1 year
Domain expiry SSL expiry Danger zone (≤30 days)
Registrar 北京新网数码信息技术有限公司
Created November 20, 1998 (27 years, 9 months ago)
Expires December 4, 2030 (4 years, 8 months)
Name Servers ns3.sina.com.cn, ns2.sina.com.cn, ns4.sina.com.cn, ns1.sina.com.cn
Hosting
IP Address 36.51.254.91
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 (1.0s)

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.

Send Feedback