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https://nikkeibp.co.jp

Infrastructure

· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.
SCORE
80
GRADE
B
FIX
2
REVIEW
2
PASS
4
INFO
1
Probed from Singapore, Singapore
301 Moved Permanently
Checks
9
4 PASS 2 REVIEW 2 FIX
D
URL Variants
Action
www/non-www, trailing slash, HTTP→HTTPS
FIX
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
Critical::
HTTP version does not redirect to HTTPS
Got: HTTP 301 Expected: 301 redirect to HTTPS

www / non-www

200https://www.nikkeibp.co.jp/
200https://nikkeibp.co.jp/

Inconsistent — duplicate content risk

HTTP → HTTPS

301http://nikkeibp.co.jp/ → http://www.nikkeibp.co.jp/

HTTP version does not redirect to HTTPS

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.

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

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

Certificate validity

297
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
2 A records, 6 ms lookup
PASS
2 A records, 6 ms lookup
Info::
Resolves to 2 IPv4 address(es)
Got: 57.182.141.123, 52.194.33.242
Info::
No IPv6 (AAAA) records
Info::
4 nameserver(s) configured
Got: ns-1484.awsdns-57.org, ns-1673.awsdns-17.co.uk, ns-47.awsdns-05.com, ns-729.awsdns-27.net
Info::
1 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: 6 ms
Got: 6 ms
A57.182.141.123, 52.194.33.242
AAAA—
CNAME—
NSns-1484.awsdns-57.org, ns-1673.awsdns-17.co.uk, ns-47.awsdns-05.com, ns-729.awsdns-27.net
MX
0 nikkeibp-co-jp.mail.protection.outlook.com
TXT
MS=ms50120014
adobe-idp-site-verification=d03e2d991fa1d9b93e2727574a887b7f18e15af3760d26559fd2...
dropbox-domain-verification=horjtypwszzm
google-site-verification=NyiiSK1BoHfHhYsS62-P5MbgN0NUmtUGtfYagzpuCqc
m4YSVLFkITYGEfkFEuiMzkQI4saG3Z
pardot906132=186eacbc142fef3b8dc5d1512baffaa5a540677a3ab587372aac5e7791bc3536
SPF v=spf1 include:spf1.nikkeibp.co.jp include:spf.protection.outlook.com ip4:61.122...
CAALookup not available with standard resolver
Resolved in 6 ms

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
1 redirect(s), 509 ms total
PASS
1 redirect(s), 509 ms total
Info::
Single redirect
Got: https://nikkeibp.co.jp → https://www.nikkeibp.co.jp/ (301)
Info::
WWW normalization redirect
Info::
Redirect overhead: 509 ms total
Got: 509 ms

https://nikkeibp.co.jp

210 ms · HTTP/1.1

301

https://www.nikkeibp.co.jp/

299 ms · HTTP/1.1 FINAL

#URLStatusTimeProtocolServer
1https://nikkeibp.co.jp301210 msHTTP/1.1Apache
2https://www.nikkeibp.co.jp/200299 msHTTP/1.1Apache

See the visual redirect chain in the HTTP Probe tab →

A+
Crawlability
robots.txt present, sitemap with 22 URLs
PASS
robots.txt present, sitemap with 22 URLs
Info::
robots.txt is present
Got: 1511 bytes
Info::
sitemap.xml is present
Info::
sitemap.xml is valid XML
Info::
sitemap.xml contains 22 entries
Info::
Sitemap index with 22 child sitemaps
Info::
robots.txt references sitemap
robots.txt 200 OK
Size 1511 B Sitemaps referenced 1 User-agents *, omgilibot, Diffbot, meta-externalfetcher, Meta-ExternalAgent, Bytespider, CCBot, MuckRack, PerplexityBot, Google-Extended, ClaudeBot, Gensparkbot, ICC-Crawler, Timpibot, Claude-User, magpie-crawler, Perplexity-User, cohere-training-data-crawler, omgili, Applebot-Extended, ChatGPT-User, Webzio-Extended, PiplBot, OAI-SearchBot, MJ12bot, Scrapy, Claude-SearchBot, Webzio-extended, FacebookBot, Claude-Web, GPTBot, Webzio, Perplexity-ai, anthropic-ai, cohere-ai, AmazonBot Blocking No — crawling allowed
User-Agent: *
Allow: /atcl/corporate/
Allow: /atcl/information/
Allow: /atcl/newsrelease/
Disallow: /corporate/
Disallow: /article/
Disallow: /atcl/

User-Agent: Claude-User
Disallow: /

User-Agent: FacebookBot
Disallow: /

User-Agent: meta-externalfetcher
Disallow: /

User-Agent: CCBot
Disallow: /

User-Agent: cohere-ai
Disallow: /

User-Agent: Claude-Web
Disallow: /

User-Agent: PiplBot
Disallow: /

User-Agent: GPTBot
Disallow: /

User-Agent: MuckRack
Disallow: /

User-Agent: PerplexityBot
Disallow: /

User-Agent: magpie-crawler
Disallow: /

User-Agent: Google-Extended
Disallow: /

User-Agent: OAI-SearchBot
Disallow: /

User-Agent: ClaudeBot
Disallow: /

User-Agent: omgilibot
Disallow: /

User-Agent: Gensparkbot
Disallow: /

User-Agent: ICC-Crawler
Disallow: /

User-Agent: MJ12bot
Disallow: /

User-Agent: Timpibot
Disallow: /

User-Agent: Webzio
Disallow: /

User-Agent: Perplexity-User
Disallow: /

User-Agent: cohere-training-data-crawler
Disallow: /

User-Agent: Scrapy
Disallow: /

User-Agent: Diffbot
Disallow: /

User-Agent: omgili
Disallow: /

User-Agent: Applebot-Extended
Disallow: /

User-Agent: Meta-ExternalAgent
Disallow: /

User-Agent: Claude-SearchBot
Disallow: /

User-Agent: Bytespider
Disallow: /

User-Agent: AmazonBot
Disallow: /

User-Agent: ChatGPT-User
Disallow: /

User-Agent: Perplexity-ai
Disallow: /

User-Agent: Webzio-Extended
Disallow: /

User-Agent: Webzio-extended
Disallow: /

User-Agent: anthropic-ai
Disallow: /



Sitemap: https://www.nikkeibp.co.jp/sitemap.xml
sitemap.xml 200 OK
Type Sitemap Index URLs 22 entries Valid XML Yes
Child Sitemaps:
A+
HTTP Probe Timing
Total 218 ms — DNS, TCP, TLS, TTFB, content transfer breakdown
PASS
DNS Lookup DNS Lookup — time to resolve the domain name to an IP address.
10 ms
TCP Connect TCP Connect — time to establish a TCP connection to the server.
68 ms
TLS Handshake TLS Handshake — time to complete the HTTPS encryption handshake.
69 ms
Time to First Byte Time to First Byte — how long the server takes to respond with the first byte of data.
218 ms
Total Time Total request time from DNS lookup through full response.
219 ms

Connection waterfall

DNS Lookup 10 ms TCP Connect 68 ms TLS Handshake 69 ms Server Processing 71 ms Content Transfer 0 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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