Infrastructure
· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.DCDN & DeliveryActionNo CDN detectedFIX
Consider using a CDN to improve global delivery speed and reduce origin load.
BRedirect Chain1 redirect(s), 2540 ms totalREVIEW
https://pconline.com.cn
657 ms · HTTP/1.1
https://www.pconline.com.cn/
1883 ms · HTTP/1.1 FINAL
| # | URL | Status | Time | Protocol | Server |
|---|---|---|---|---|---|
| 1 | https://pconline.com.cn | 301 | 657 ms | HTTP/1.1 | Tengine |
| 2 | https://www.pconline.com.cn/ | 200 | 1883 ms | HTTP/1.1 | openresty |
See the visual redirect chain in the HTTP Probe tab →
CIPv6 ReadinessActionNo IPv6 supportREVIEW
IPv6 support is increasingly important for global accessibility. About 40% of internet users have IPv6 connectivity.
No AAAA records — same impact as 'no IPv6 (AAAA) records'; IPv6-preferring clients pay extra latency falling back to IPv4.
Source: Google IPv6 stats
CCrawlabilityActionrobots.txt present, sitemap with 0 URLsREVIEW
Search engines may not be able to parse the sitemap. Fix XML validation errors.
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.
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.
robots.txt omits Sitemap: directive — crawlers must fetch /sitemap.xml by convention; reliable but missing the explicit hint.
Source: sitemaps.org
User-agent: *
Disallow:/3g/
Disallow:/b5/
Disallow:/test/
Disallow:/*/test/*
Disallow:/rbin/
Disallow:/tech/
Disallow:/zhizuotest/
Disallow:/global/
Disallow:/000025918/
Disallow:/coop/
Disallow:/consortium/4399/
Disallow:/pdbk/
Disallow:.js$
Disallow:.css$
Disallow:/app/
Disallow:/jrzcz/
Disallow:/pconline_history/
BURL Variantswww/non-www, trailing slash, HTTP→HTTPSREVIEW
www / non-www
Inconsistent — duplicate content risk
HTTP → HTTPS
Consistent
BHTTP Probe TimingTotal 1003 ms — DNS, TCP, TLS, TTFB, content transfer breakdownREVIEW
Connection waterfall
BTLS Certificate Expiry & Recommendations185 days until leaf cert expires — 3 issues to addressREVIEW
Certificate validity
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
ADNS Records1 A records, 319 ms lookupPASS
| A | 120.25.87.159 |
| AAAA | — |
| CNAME | — |
| NS | ns.pc.com.cn, ns2.pc.com.cn |
| MX | 5 mxbiz1.qq.com 10 mxbiz2.qq.com |
| TXT | globalsign-domain-verification=yLeN17ltAxt4qZgDkdEVVa7iyPAZQKpj-bQJBI5QrH SPF v=spf1 include:spf.mail.qq.com ~all google-site-verification = aQoHNYBJ1oFe-c03Eoi_GoO3laLJMxyBdctFnYswPh0 MS=9A94565153682BAF216727C5DF651C58C7140786 |
| CAA | Lookup not available with standard resolver |
Multiple A records provide failover if one server goes down.
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.
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.
DNS resolution is slow — anycast DNS providers (Cloudflare, Route 53) typically resolve <50ms globally.
Source: DNS performance benchmarks
A+Domain Intelligencepconline.com.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）, 27 years, 5 months old, hosted on Alibaba CloudPASS
1735 days
March 17, 2031
185 days
Issued by GlobalSign nv-sa
27 years, 5 months
Registered March 17, 1999
Status unknown
Protects against DNS spoofing
Alibaba Cloud
ASN AS37963
120.25.87.159
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）
Expiry timeline
Recommended actions
- Enable registrar lock (clientTransferProhibited) to block unauthorized domain transfers
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.
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