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https://fudan.edu.cn

Infrastructure

· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.
SCORE
87
GRADE
B
FIX
1
REVIEW
3
PASS
4
INFO
1
Probed from Singapore, Singapore
200 OK
Checks
9
4 PASS 3 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
Crawlability
no robots.txt, no sitemap
REVIEW
no robots.txt, no sitemap
Info::
No robots.txt found
robots.txt is optional but recommended. It tells search engine crawlers which pages to index.
Info::
No sitemap.xml found
A sitemap helps search engines discover and index your pages more efficiently.

robots.txt is optional but recommended. It tells search engine crawlers which pages to index.

Why this matters

No robots.txt — crawlers fetch /robots.txt and get 404; not breaking but means default crawl behavior with no directives or sitemap reference.

Learn more ▾

A minimal robots.txt with `User-agent: * / Allow: / / Sitemap: https://example.com/sitemap.xml` covers the basics. Without it, crawlers behave fine but lose the sitemap signal and can't be selectively blocked from crawl-traps.

Source: robotstxt.org

A sitemap helps search engines discover and index your pages more efficiently.

Why this matters

No sitemap.xml — Google relies on crawl-graph discovery alone, slowing indexing of deep or fresh URLs.

Learn more ▾

A sitemap accelerates Google's discovery of new and updated content. Most CMSes auto-generate one; static-site frameworks need a build-step plugin. Reference it from robots.txt and submit in Search Console to confirm Google can fetch it.

Source: sitemaps.org / Google Search Central

robots.txt No robots.txt found

No robots.txt found

This is fine for most sites — a missing robots.txt allows all crawling by default.

sitemap.xml No sitemap found

No sitemap found

Adding a sitemap helps search engines discover your pages.

C
URL Variants
Action
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
Warning::
HTTP→HTTPS redirect uses 302 instead of 301
Got: 302 temporary redirect Expected: 301 permanent redirect

www / non-www

200https://www.fudan.edu.cn/
200https://fudan.edu.cn/

Inconsistent — duplicate content risk

HTTP → HTTPS

302http://fudan.edu.cn/ → https://fudan.edu.cn/

Use 301 (permanent) instead of 302 (temporary)

B
TLS Certificate Expiry & Recommendations
32 days until leaf cert expires — 3 issues to address
REVIEW

Certificate validity

32
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, 69 ms lookup
PASS
1 A records, 69 ms lookup
Info::
Resolves to 1 IPv4 address(es)
Got: 175.186.248.54
Info::
Single A record — no DNS redundancy
Multiple A records provide failover if one server goes down.
Info::
Has 1 IPv6 (AAAA) record(s)
Got: 240c:c701:1:3513::54
Info::
4 nameserver(s) configured
Got: ns1.fudan.edu.cn, ns4.fudan.edu.cn, ns2.fudan.edu.cn, ns3.fudan.edu.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
Info::
DNS resolution time: 69 ms
Got: 69 ms
A175.186.248.54
AAAA240c:c701:1:3513::54
CNAME—
NSns1.fudan.edu.cn, ns4.fudan.edu.cn, ns2.fudan.edu.cn, ns3.fudan.edu.cn
MX
1 mx-fudan-edu-cn.icoremail.net
10 mailrelay2.fudan.edu.cn
10 mailrelay1.fudan.edu.cn
TXT
SPF v=spf1 ip4:202.120.224.0/24 ip4:61.129.42.0/24 ip4:202.120.241.1/29 ip4:202.120....
CAALookup not available with standard resolver
Resolved in 69 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.

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

https://fudan.edu.cn

460 ms · HTTP/1.1 FINAL

#URLStatusTimeProtocolServer
1https://fudan.edu.cn200460 msHTTP/1.1Apache
A+
IPv6 Readiness
IPv6 reachable (93 ms)
PASS
IPv6 reachable (93 ms)
Info::
IPv6 is configured and reachable at 240c:c701:1:3513::54
Got: 93 ms connect
IPv6 Ready
AAAA Records 240c:c701:1:3513::54 Connection Reachable (93 ms)
A
HTTP Probe Timing
Total 669 ms — DNS, TCP, TLS, TTFB, content transfer breakdown
PASS
DNS Lookup DNS Lookup — time to resolve the domain name to an IP address.
62 ms
TCP Connect TCP Connect — time to establish a TCP connection to the server.
98 ms
TLS Handshake TLS Handshake — time to complete the HTTPS encryption handshake.
198 ms
Time to First Byte Time to First Byte — how long the server takes to respond with the first byte of data.
473 ms
Total Time Total request time from DNS lookup through full response.
670 ms

Connection waterfall

DNS Lookup 62 ms TCP Connect 98 ms TLS Handshake 198 ms Server Processing 115 ms Content Transfer 197 ms
Domain Intelligence
Domain intelligence data not available
INFO
Domain intelligence data not available

RDAP and WHOIS lookup both failed

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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