Infrastructure

· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.

SCORE

GRADE

FIX

REVIEW

PASS

INFO

Probed from Amsterdam, Netherlands

200 OK

Checks

5 PASS 3 REVIEW 1 FIX

CDN & Delivery

Action

No CDN detected

FIX

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.

URL Variants

www/non-www, trailing slash, HTTP→HTTPS

REVIEW

www/non-www, trailing slash, HTTP→HTTPS

Both www and non-www versions serve content

Got: Both variants return 200 Expected: One variant 301-redirects to the other

HTTP correctly 301-redirects to HTTPS

www / non-www

200https://www.tudou.com/

200https://tudou.com/

Inconsistent — duplicate content risk

HTTP → HTTPS

301http://tudou.com/ → https://tudou.com/

Consistent

HTTP Probe Timing

Total 1223 ms — DNS, TCP, TLS, TTFB, content transfer breakdown

REVIEW

DNS Lookup

164 ms

TCP Connect

203 ms

TLS Handshake

408 ms

Time to First Byte

1.02 s

Total Time

1.22 s

Connection waterfall

DNS Lookup 164 ms TCP Connect 203 ms TLS Handshake 408 ms Server Processing 244 ms Content Transfer 204 ms

TLS Certificate Expiry & Recommendations

304 days until leaf cert expires — 5 issues to address

REVIEW

Certificate validity

304

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
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

DNS Records

1 A records, 327 ms lookup

PASS

1 A records, 327 ms lookup

Resolves to 1 IPv4 address(es)

Got: 106.11.43.215

Single A record — no DNS redundancy

Multiple A records provide failover if one server goes down.

Has 2 IPv6 (AAAA) record(s)

Got: 2408:4001:f00::1af, 2408:4001:f10::8

4 nameserver(s) configured

Got: dns4.youku.com, dns3.youku.com, dns2.youku.com, dns1.youku.com

2 mail exchanger(s) configured

CAA records not checked

CAA record lookup requires a specialized DNS resolver. This check will be available in a future update.

SPF record present in TXT

DNS resolution is slow (327 ms)

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

Got: 327 ms

A	106.11.43.215
AAAA	2408:4001:f00::1af, 2408:4001:f10::8
CNAME	—
NS	dns4.youku.com, dns3.youku.com, dns2.youku.com, dns1.youku.com
MX	5 mx1.tudou.com 5 mx2.tudou.com
TXT	_globalsign-domain-verification=rYHlOW27hmqJdg3gBSfswqYPbdmpFT08OwXasXDfU3 SPF v=spf1 include:spf1.staff.mail.aliyun.com -all _globalsign-domain-verification=yk5BQwbQfjY9ix-4zK96Ex2X9aG7i9z8Z6G2lR8xPv _globalsign-domain-verification=8fmvb_NNqEFennAbFZa3Lp-y1EQ6bkPzHJN5Cx5mur
CAA	Lookup not available with standard resolver

Resolved in 327 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

Got: https://tudou.com

https://tudou.com

967 ms · HTTP/1.1 FINAL

#	URL	Status	Time	Protocol	Server
1	https://tudou.com	200	967 ms	HTTP/1.1	Tengine/Aserver

A+

IPv6 Readiness

IPv6 reachable (268 ms)

PASS

IPv6 reachable (268 ms)

IPv6 is configured and reachable at 2408:4001:f00::1af, 2408:4001:f10::8

Got: 268 ms connect

IPv6 Ready

AAAA Records 2408:4001:f00::1af, 2408:4001:f10::8 Connection Reachable (268 ms)

A+

Crawlability

robots.txt present, sitemap with 51 URLs

PASS

robots.txt present, sitemap with 51 URLs

robots.txt is present

Got: 10240 bytes

sitemap.xml is present

sitemap.xml is valid XML

sitemap.xml contains 51 entries

robots.txt does not reference a sitemap

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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            --IMG_DEFAULT_COLOR: #E4E4E4;
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            sampleRate: 0.2,
            bu: 'youku',
            code: 7105,
            forceManualEnable: true,
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        gold_queue.push({
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        // pv日志上报
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            action: 'goldlog.sendPV',
            arguments: [{
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            log_ver: 'v2',
            urlInfo: 'ab_test=&web_test='
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</script><script> window.pageTheme = "undefined";
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        window.adPercent =100;
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        window.youku_act_window_isShow =true;
        window.headerInterceptSwitch =true;
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sitemap.xml 200 OK

Type URL Set URLs 51 entries Valid XML Yes

Sample URLs:

A+

Domain Intelligence

tudou.com — via Alibaba Cloud Computing (Beijing) Co., Ltd., 22 years, 1 months old

PASS

tudou.com — via Alibaba Cloud Computing (Beijing) Co., Ltd., 22 years, 1 months old

Domain registered until Jul 13, 2027 (1 years, 2 months remaining)

DNSSEC is not enabled

DNSSEC protects against DNS spoofing attacks. While not required, enabling DNSSEC adds an additional layer of security. Contact your DNS provider to enable it.

Registrar: Alibaba Cloud Computing (Beijing) Co., Ltd.

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.

Domain expiry

392 days

July 13, 2027

SSL certificate

304 days

Issued by GlobalSign nv-sa

Domain age

22 years, 1 months

Registered July 13, 2004

DNSSEC

Not enabled

Protects against DNS spoofing

Hosting

Unknown

2408:4001:f00::1af

Registrar

Alibaba Cloud Computing (Beijing) Co., Ltd.

Unlocked 4 NS records

Expiry timeline

Today

+1 year

Domain expiry SSL expiry Danger zone (≤30 days)

Recommended actions

Enable DNSSEC to protect visitors from DNS spoofing
Enable registrar lock (clientTransferProhibited) to block unauthorized domain transfers

Registrar Alibaba Cloud Computing (Beijing) Co., Ltd.

Created July 13, 2004 (22 years, 1 months ago)

Expires July 13, 2027 (1 years, 2 months)

Last Updated March 10, 2026

Name Servers dns1.youku.com, dns2.youku.com, dns3.youku.com, dns4.youku.com

DNSSEC Not enabled

Hosting

IP Address 2408:4001:f00::1af

Data source: rdap (0.3s)

DNSSEC protects against DNS spoofing attacks. While not required, enabling DNSSEC adds an additional layer of security. Contact your DNS provider to enable it.

Why this matters

Without DNSSEC, an attacker who can poison your DNS can hijack your domain — and SSL certs alone don't stop them.

Learn more ▾

DNSSEC adds cryptographic signatures to DNS records, preventing forged responses from poisoning resolver caches. Without it, an attacker who controls the network path can redirect your domain to a malicious server before any HTTPS handshake happens. Most modern registrars (Cloudflare, Google Domains, Route 53) enable it with one toggle.

Source: ICANN / RFC 4033

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.