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https://xuexi.cn

Infrastructure

· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.
SCORE
74
GRADE
C
FIX
1
REVIEW
7
PASS
1
INFO
0
Probed from Sao Paulo, Brazil
302 Found
Checks
9
1 PASS 7 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
DNS Records
2 A records, 369 ms lookup
REVIEW
2 A records, 369 ms lookup
Info::
Resolves to 2 IPv4 address(es)
Got: 180.163.44.121, 180.163.44.120
Info::
No IPv6 (AAAA) records
Warning::
CNAME record at zone apex
A CNAME at the zone apex can break MX and NS records. Use ALIAS/ANAME or A records instead.
Got: xuexi.cn.w.alikunlun.com
Info::
2 nameserver(s) configured
Got: vip4.alidns.com, vip3.alidns.com
Info::
2 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::
No SPF record found in TXT records
SPF helps prevent email spoofing. Add a TXT record starting with 'v=spf1'.
Warning::
DNS resolution is slow (369 ms)
Slow DNS adds latency to every page load. Consider a faster DNS provider.
Got: 369 ms
A180.163.44.121, 180.163.44.120
AAAA—
CNAMExuexi.cn.w.alikunlun.com
NSvip4.alidns.com, vip3.alidns.com
MX
5 mxn.mxhichina.com
10 mxw.mxhichina.com
TXT
70fbae486996ad50e8012fa86c2bddff
CAALookup not available with standard resolver
Resolved in 369 ms

A CNAME at the zone apex can break MX and NS records. Use ALIAS/ANAME or A records instead.

Why this matters

CNAME at the apex (example.com) breaks every other apex record (MX, TXT, NS) — DNS-protocol violation per RFC 1034.

Learn more ▾

RFC 1034 forbids CNAME alongside other records at the same name. Some DNS providers offer ALIAS / ANAME / flattened-CNAME records that work around this — use those instead. Otherwise apex-level CNAME breaks email (no MX), domain ownership verification (no TXT), and more.

Source: RFC 1034

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.

SPF helps prevent email spoofing. Add a TXT record starting with 'v=spf1'.

Why this matters

Without SPF, receiving servers can't validate sending IPs — your domain is easier to spoof in phishing.

Learn more ▾

SPF complements DMARC. Both should be published. SPF records list authorized sending IPs (e.g., `v=spf1 include:_spf.google.com ~all` for Google Workspace). After publishing, verify in Google Postmaster Tools or mxtoolbox.

Source: RFC 7208 (SPF)

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

B
Redirect Chain
1 redirect(s), 3891 ms total
REVIEW
1 redirect(s), 3891 ms total
Info::
Single redirect
Got: https://xuexi.cn → https://www.xuexi.cn/index.html (302)
Info::
WWW normalization redirect
Info::
Uses 302 (temporary) redirect
If permanent, use 301 instead.
Got: https://xuexi.cn
Warning::
Redirect overhead: 3891 ms total
Got: 3891 ms

https://xuexi.cn

1782 ms · HTTP/1.1

302

https://www.xuexi.cn/index.html

2110 ms · HTTP/1.1 FINAL

#URLStatusTimeProtocolServer
1https://xuexi.cn3021782 msHTTP/1.1Tengine
2https://www.xuexi.cn/index.html2002110 msHTTP/1.1Tengine

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

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
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Allow: /9304a8e077c581eaf3372edac74cfdcf/e43e220633a65f9b6d8b53712cba9caa.html
Allow: /a230eb21647db6af68b56821f50af85d/e43e220633a65f9b6d8b53712cba9caa.html
Allow: /3419755026f8570c5c2097341d5f17b2/e43e220633a65f9b6d8b53712cba9caa.html
Allow: /69cab3773dffaa18b0de077a131
sitemap.xml 200 OK
Type URL Set URLs 0 entries Valid XML No
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.xuexi.cn/
200https://xuexi.cn/

Inconsistent — duplicate content risk

HTTP → HTTPS

301http://xuexi.cn/ → https://xuexi.cn/

Consistent

C
HTTP Probe Timing
Action
Total 1661 ms — DNS, TCP, TLS, TTFB, content transfer breakdown
REVIEW
DNS Lookup DNS Lookup — time to resolve the domain name to an IP address.
428 ms
TCP Connect TCP Connect — time to establish a TCP connection to the server.
307 ms
TLS Handshake TLS Handshake — time to complete the HTTPS encryption handshake.
618 ms
Time to First Byte Time to First Byte — how long the server takes to respond with the first byte of data.
1.66 s
Total Time Total request time from DNS lookup through full response.
1.66 s

Connection waterfall

DNS Lookup 428 ms TCP Connect 307 ms TLS Handshake 618 ms Server Processing 308 ms Content Transfer 0 ms
B
TLS Certificate Expiry & Recommendations
283 days until leaf cert expires — 4 issues to address
REVIEW

Certificate validity

283
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+
Domain Intelligence
xuexi.cn — via 阿里云计算有限公司（万网）, 23 years, 5 months old, hosted on CHINANET-SHANGHAI-MAN China Telecom Group, CN
PASS
xuexi.cn — via 阿里云计算有限公司（万网）, 23 years, 5 months old, hosted on CHINANET-SHANGHAI-MAN China Telecom Group, CN
Info::
Domain registered until Mar 17, 2028 (1 years, 11 months remaining)
Info::
Registrar: 阿里云计算有限公司（万网）
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: CHINANET-SHANGHAI-MAN China Telecom Group, CN
Got: AS4811
Domain expiry

640 days

March 17, 2028

SSL certificate

283 days

Issued by GlobalSign nv-sa

Domain age

23 years, 5 months

Registered March 17, 2003

DNSSEC

Status unknown

Protects against DNS spoofing

Hosting

CHINANET-SHANGHAI-MAN China Telecom Group, CN

ASN AS4811

180.163.44.121

Registrar

阿里云计算有限公司（万网）

Unlocked 2 NS records
Expiry timeline
Today
+1 year
Domain expiry SSL expiry Danger zone (≤30 days)
Recommended actions
  • Enable registrar lock (clientTransferProhibited) to block unauthorized domain transfers
Registrar 阿里云计算有限公司（万网）
Created March 17, 2003 (23 years, 5 months ago)
Expires March 17, 2028 (1 years, 11 months)
Name Servers vip3.alidns.com, vip4.alidns.com
Hosting
IP Address 180.163.44.121
ASN AS4811 (CHINANET-SHANGHAI-MAN China Telecom Group, CN)
Provider CHINANET-SHANGHAI-MAN China Telecom Group, CN
Data source: whois (1.7s)

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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