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 Madrid, Spain

200 OK

Checks

3 PASS 5 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.

IPv6 Readiness

Action

No IPv6 support

REVIEW

No IPv6 support

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

Crawlability

robots.txt present, no sitemap

REVIEW

robots.txt present, no sitemap

robots.txt is present

Got: 10240 bytes

No sitemap.xml found

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

robots.txt does not reference a sitemap

Add a 'Sitemap:' directive to robots.txt so search engines can discover your sitemap.

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

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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sitemap.xml No sitemap found

No sitemap found

Adding a sitemap helps search engines discover your pages.

URL Variants

Action

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→HTTPS redirect uses 302 instead of 301

Got: 302 temporary redirect Expected: 301 permanent redirect

www / non-www

200https://www.youdao.com/

200https://youdao.com/

Inconsistent — duplicate content risk

HTTP → HTTPS

307http://youdao.com/ → https://youdao.com/

Use 301 (permanent) instead of 302 (temporary)

HTTP Probe Timing

Total 1109 ms — DNS, TCP, TLS, TTFB, content transfer breakdown

REVIEW

DNS Lookup

256 ms

TCP Connect

183 ms

TLS Handshake

185 ms

Time to First Byte

860 ms

Total Time

1.11 s

Connection waterfall

DNS Lookup 256 ms TCP Connect 183 ms TLS Handshake 185 ms Server Processing 236 ms Content Transfer 250 ms

TLS Certificate Expiry & Recommendations

192 days until leaf cert expires — 3 issues to address

REVIEW

Certificate validity

192

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

DNS Records

1 A records, 255 ms lookup

PASS

1 A records, 255 ms lookup

Resolves to 1 IPv4 address(es)

Got: 220.197.31.37

Single A record — no DNS redundancy

Multiple A records provide failover if one server goes down.

No IPv6 (AAAA) records

3 nameserver(s) configured

Got: rem3.yodao.net, rem2.yodao.net, rem1.yodao.net

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 (255 ms)

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

Got: 255 ms

A	220.197.31.37
AAAA	—
CNAME	—
NS	rem3.yodao.net, rem2.yodao.net, rem1.yodao.net
MX	10 hzmx01.mxmail.netease.com 20 hzmx02.mxmail.netease.com
TXT	SPF v=spf1 include:spf.163.com ip4:61.135.221.0/24 ip4:123.58.182.192/26 ip4:220.181...
CAA	Lookup not available with standard resolver

Resolved in 255 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://youdao.com

https://youdao.com

733 ms · HTTP/1.1 FINAL

#	URL	Status	Time	Protocol	Server
1	https://youdao.com	200	733 ms	HTTP/1.1	YDWS

A+

Domain Intelligence

youdao.com — via Alibaba Cloud Computing (Beijing) Co., Ltd., 24 years, 2 months old, hosted on CHINA169-BACKBONE CHINA UNICOM China169 Backbone, CN

PASS

youdao.com — via Alibaba Cloud Computing (Beijing) Co., Ltd., 24 years, 2 months old, hosted on CHINA169-BACKBONE CHINA UNICOM China169 Backbone, CN

Domain registered until Jun 15, 2027 (1 years, 1 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.

Hosting: CHINA169-BACKBONE CHINA UNICOM China169 Backbone, CN

Got: AS4837

Domain expiry

332 days

June 15, 2027

SSL certificate

192 days

Issued by DigiCert, Inc.

Domain age

24 years, 2 months

Registered June 15, 2002

DNSSEC

Not enabled

Protects against DNS spoofing

Hosting

CHINA169-BACKBONE CHINA UNICOM China169 Backbone, CN

ASN AS4837

220.197.31.37

Registrar

Alibaba Cloud Computing (Beijing) Co., Ltd.

Unlocked 3 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 June 15, 2002 (24 years, 2 months ago)

Expires June 15, 2027 (1 years, 1 months)

Last Updated May 19, 2025

Name Servers rem1.yodao.net, rem2.yodao.net, rem3.yodao.net

DNSSEC Not enabled

Hosting

IP Address 220.197.31.37

ASN AS4837 (CHINA169-BACKBONE CHINA UNICOM China169 Backbone, CN)

Provider CHINA169-BACKBONE CHINA UNICOM China169 Backbone, CN

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.