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https://nrc.nl

Infrastructure

· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.
SCORE
83
GRADE
B
FIX
1
REVIEW
4
PASS
4
INFO
0
Probed from Singapore, Singapore
301 Moved Permanently
Checks
9
4 PASS 4 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
Redirect Chain
1 redirect(s), 1001 ms total
REVIEW
1 redirect(s), 1001 ms total
Info::
Single redirect
Got: https://nrc.nl → https://www.nrc.nl/ (301)
Info::
WWW normalization redirect
Warning::
Redirect overhead: 1001 ms total
Got: 1001 ms

https://nrc.nl

503 ms · HTTP/1.1

301

https://www.nrc.nl/

498 ms · HTTP/1.1 FINAL

#URLStatusTimeProtocolServer
1https://nrc.nl301503 msHTTP/1.1nginx
2https://www.nrc.nl/200498 msHTTP/1.1nginx

See the visual redirect chain in the HTTP Probe tab →

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
URL Variants
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
Info::
HTTP correctly 301-redirects to HTTPS

www / non-www

200https://www.nrc.nl/
200https://nrc.nl/

Inconsistent — duplicate content risk

HTTP → HTTPS

301http://nrc.nl/ https://www.nrc.nl/

Consistent

B
TLS Certificate Expiry & Recommendations
343 days until leaf cert expires — 2 issues to address
REVIEW

Certificate validity

343
days left
0d 30d 60d 90d+

Recommended actions

  • Enable HSTS: Strict-Transport-Security: max-age=31536000; includeSubDomains
  • Enable OCSP stapling on your TLS server to remove a CA roundtrip and protect user privacy
A+
DNS Records
1 A records, 10 ms lookup
PASS
1 A records, 10 ms lookup
Info::
Resolves to 1 IPv4 address(es)
Got: 46.22.183.139
Info::
Single A record — no DNS redundancy
Multiple A records provide failover if one server goes down.
Info::
No IPv6 (AAAA) records
Info::
2 nameserver(s) configured
Got: eva.ns.cloudflare.com, phil.ns.cloudflare.com
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: 10 ms
Got: 10 ms
A46.22.183.139
AAAA
CNAME
NSeva.ns.cloudflare.com, phil.ns.cloudflare.com
MX
10 nrc-nl.mail.protection.outlook.com
TXT
MS=ms21743690
_zyp6z2rhzgp7elsb4mu4b489p2k0mx7
blitz=mu-b6144c2e-429acc50-9f761b0f-4187a6ac
google-gws-recovery-domain-verification=53127880
1password-site-verification=N7FXCOWMXZFRLCBGGY5SJMVFQQ
facebook-domain-verification=zssl5avhcj1uut9k2c1dr5yjr7oydv
google-site-verification=3ZR4f0Ewcn9YB64nwdtKwRPP1H_NQzEqVLyi4laDnLQ
google-site-verification=GSppHa0q0UbE00OOKtUrywm-EgHI2obFZAALSgeYNXc
google-site-verification=N_4G16QG--24SkIiXKjdhWCIg-HNJWw1KllU0CoWRhM
google-site-verification=ikgVoGAKV4DKqx-ng7ZzhrPX08Y3p7hX2M1EFV2UsWk
apple-domain-verification=iDCKm6RneFM_me_nD9O5JCwJ_JzQxda8m_k2oSwQjQY
bQnS/PGTwj7QNUp8O3XSqNNcRMiaFEaicDl6zvqyKjqOLzutoRXYkYTzU4oiktZqJur/uY9b5EgA2IYp...
adobe-idp-site-verification=2874515d68b0370803179f9e8d6698cb503e00756499a6e7a042...
atlassian-domain-verification=lMLcQEH8BbDfXWN11OfWNm2Jk19vskfLinI0rLNnVQ9gZEtb9a...
SPF v=spf1 include:spf.protection.outlook.com include:spf.messagelabs.com ip4:185.43...
CAALookup not available with standard resolver
Resolved in 10 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+
Crawlability
robots.txt present, sitemap with 16 URLs
PASS
robots.txt present, sitemap with 16 URLs
Info::
robots.txt is present
Got: 3502 bytes
Info::
sitemap.xml is present
Info::
sitemap.xml is valid XML
Info::
sitemap.xml contains 16 entries
Info::
Sitemap index with 16 child sitemaps
Info::
robots.txt references sitemap
robots.txt 200 OK
Size 3502 B Sitemaps referenced 1 User-agents aiHitBot, Awario, FirecrawlAgent, Google-CloudVertexBot, PanguBot, ISSCyberRiskCrawler, anthropic-ai, Claude-SearchBot, Echobot Bot, GoogleAgent-Mariner, QualifiedBot, Amazonbot, cohere-ai, EchoboxBot, MistralAI-User/1.0, MyCentralAIScraperBot, OAI-SearchBot, omgili, Perplexity-User, AI2Bot, Ai2Bot-Dolma, bedrockbot, ChatGPT-User, Diffbot, DuckAssistBot, img2dataset, PetalBot, Kangaroo Bot, NovaAct, CCBot, ICC-Crawler, PhindBot, SummalyBot, Timpibot, WARDBot, YandexAdditional, Applebot-Extended, cohere-training-data-crawler, Google-Extended, GPTBot, iaskspider/2.0, panscient.com, Scrapy, VelenPublicWebCrawler, *, Andibot, Claude-Web, ClaudeBot, Datenbank Crawler, GoogleOther, MistralAI-User, Panscient, Sidetrade indexer bot, YouBot, Bytespider, Cotoyogi, Devin, GoogleOther-Video, SemrushBot-SWA, magpie-crawler, Crawlspace, Factset_spyderbot, FriendlyCrawler, netEstate Imprint Crawler, Poseidon Research Crawler, TikTokSpider, Brightbot 1.0, Meta-ExternalAgent, YandexAdditionalBot, GoogleOther-Image, SBIntuitionsBot, Thinkbot, Webzio-Extended, omgilibot, Claude-User, Gemini-Deep-Research, ImagesiftBot, meta-externalagent, Operator, PerplexityBot, QuillBot, quillbot.com, SemrushBot-OCOB, wpbot Blocking No — crawling allowed
# All copyrights, neighbouring rights and database rights in the content and
# layout of this website/app are explicitly reserved and are for personal,
# non-commercial use only. In accordance with Article 4 of the Directive on
# Copyright in the Digital Single Market (CDSM) and its transposition into
# the law of the applicable Member State, all content of this website on
# which it is made available is not to be used for the purposes of text and
# data mining, extraction, scraping and/or the use of programs or robots for
# automatic data collection and/or extraction of digital data, whether for
# machine learning or artificial intelligence purposes or otherwise. See
# also the Terms and Conditions of this website.

User-agent: *
Disallow: /*/appview
Disallow: /*/data/related$
Disallow: /api/wordproof/
Disallow: /data/
Disallow: /de/data/s3/
Disallow: /nieuwsbrieven/preview/
Disallow: /paywall-api/
Disallow: /preview/
Disallow: /search/

User-agent: magpie-crawler
Disallow: /

# https://github.com/ai-robots-txt/ai.robots.txt/blob/main/robots.txt
# I excluded:
# - Applebot as that is also used for Apple News.
# - Some facebook user-agents that are required for threads/facebook.
User-agent: AI2Bot
User-agent: Ai2Bot-Dolma
User-agent: aiHitBot
User-agent: Amazonbot
User-agent: Andibot
User-agent: anthropic-ai
# User-agent: Applebot
User-agent: Applebot-Extended
User-agent: Awario
User-agent: bedrockbot
User-agent: Brightbot 1.0
User-agent: Bytespider
User-agent: CCBot
User-agent: ChatGPT-User
User-agent: Claude-SearchBot
User-agent: Claude-User
User-agent: Claude-Web
User-agent: ClaudeBot
User-agent: cohere-ai
User-agent: cohere-training-data-crawler
User-agent: Cotoyogi
User-agent: Crawlspace
User-agent: Datenbank Crawler
User-agent: Devin
User-agent: Diffbot
User-agent: DuckAssistBot
User-agent: Echobot Bot
User-agent: EchoboxBot
# User-agent: FacebookBot
# User-agent: facebookexternalhit
User-agent: Factset_spyderbot
User-agent: FirecrawlAgent
User-agent: FriendlyCrawler
User-agent: Gemini-Deep-Research
User-agent: Google-CloudVertexBot
User-agent: Google-Extended
User-agent: GoogleAgent-Mariner
User-agent: GoogleOther
User-agent: GoogleOther-Image
User-agent: GoogleOther-Video
User-agent: GPTBot
User-agent: iaskspider/2.0
User-agent: ICC-Crawler
User-agent: ImagesiftBot
User-agent: img2dataset
User-agent: ISSCyberRiskCrawler
User-agent: Kangaroo Bot
User-agent: meta-externalagent
User-agent: Meta-ExternalAgent
# User-agent: meta-externalfetcher
# User-agent: Meta-ExternalFetcher
User-agent: MistralAI-User
User-agent: MistralAI-User/1.0
User-agent: MyCentralAIScraperBot
User-agent: netEstate Imprint Crawler
User-agent: NovaAct
User-agent: OAI-SearchBot
User-agent: omgili
User-agent: omgilibot
User-agent: Operator
User-agent: PanguBot
User-agent: Panscient
User-agent: panscient.com
User-agent: Perplexity-User
User-agent: PerplexityBot
User-agent: PetalBot
User-agent: PhindBot
User-agent: Poseidon Research Crawler
User-agent: QualifiedBot
User-agent: QuillBot
User-agent: quillbot.com
User-agent: SBIntuitionsBot
User-agent: Scrapy
User-agent: SemrushBot-OCOB
User-agent: SemrushBot-SWA
User-agent: Sidetrade indexer bot
User-agent: SummalyBot
User-agent: Thinkbot
User-agent: TikTokSpider
User-agent: Timpibot
User-agent: VelenPublicWebCrawler
User-agent: WARDBot
User-agent: Webzio-Extended
User-agent: wpbot
User-agent: YandexAdditional
User-agent: YandexAdditionalBot
User-agent: YouBot
Disallow: /

Sitemap: https://www.nrc.nl/sitemap/index.xml
A+
Domain Intelligence
nrc.nl — via team.blue nl B.V., 32 years, 7 months old, hosted on NL-INTERMAX Intermax Cloudsourcing B.V., NL
PASS
nrc.nl — via team.blue nl B.V., 32 years, 7 months old, hosted on NL-INTERMAX Intermax Cloudsourcing B.V., NL
Info::
DNSSEC is enabled
Info::
Registrar: team.blue nl B.V.
Warning::
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.
Info::
Hosting: NL-INTERMAX Intermax Cloudsourcing B.V., NL
Got: AS24586
Domain expiry

Unknown

SSL certificate

343 days

Issued by Sectigo Limited

Domain age

32 years, 7 months

Registered February 9, 1994

DNSSEC

Enabled

Protects against DNS spoofing

Hosting

NL-INTERMAX Intermax Cloudsourcing B.V., NL

ASN AS24586

46.22.183.139

Registrar

team.blue nl B.V.

Unlocked 2 NS records
Expiry timeline
Today
+1 year
SSL expiry Danger zone (≤30 days)
Recommended actions
  • Enable registrar lock (clientTransferProhibited) to block unauthorized domain transfers
Registrar team.blue nl B.V.
Created February 9, 1994 (32 years, 7 months ago)
Last Updated August 18, 2022
Name Servers phil.ns.cloudflare.com, eva.ns.cloudflare.com
DNSSEC Enabled
Registrant NRC Media B.V.
Hosting
IP Address 46.22.183.139
ASN AS24586 (NL-INTERMAX Intermax Cloudsourcing B.V., NL)
Provider NL-INTERMAX Intermax Cloudsourcing B.V., NL
Data source: rdap (1.2s)

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

A
HTTP Probe Timing
Total 497 ms — DNS, TCP, TLS, TTFB, content transfer breakdown
PASS
DNS Lookup DNS Lookup — time to resolve the domain name to an IP address.
5 ms
TCP Connect TCP Connect — time to establish a TCP connection to the server.
163 ms
TLS Handshake TLS Handshake — time to complete the HTTPS encryption handshake.
167 ms
Time to First Byte Time to First Byte — how long the server takes to respond with the first byte of data.
498 ms
Total Time Total request time from DNS lookup through full response.
498 ms

Connection waterfall

DNS Lookup 5 ms TCP Connect 163 ms TLS Handshake 167 ms Server Processing 163 ms Content Transfer 0 ms
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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