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https://aerzteblatt.de

Infrastructure

· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.
SCORE
86
GRADE
B
FIX
1
REVIEW
3
PASS
5
INFO
0
Probed from Madrid, Spain
301 Moved Permanently
Checks
9
5 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.

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.aerzteblatt.de/
200https://aerzteblatt.de/

Inconsistent — duplicate content risk

HTTP → HTTPS

301http://aerzteblatt.de/ → https://www.aerzteblatt.de/

Consistent

B
TLS Certificate Expiry & Recommendations
182 days until leaf cert expires — 4 issues to address
REVIEW

Certificate validity

182
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
  • 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, 53 ms lookup
PASS
1 A records, 53 ms lookup
Info::
Resolves to 1 IPv4 address(es)
Got: 35.157.125.147
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: ns19.domaincontrol.com, ns20.domaincontrol.com
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: 53 ms
Got: 53 ms
A35.157.125.147
AAAA—
CNAME—
NSns19.domaincontrol.com, ns20.domaincontrol.com
MX
40 nsp-mail-gw.westeurope.cloudapp.azure.com
50 dst.aerzteverlag-it.de
100 mailgw.aerzteverlag.de
TXT
xj5+7RCjmD+JYIVKV+QT2bxc7iOjJ1P1AuOzaksINhzw0YhM5FAZB74uxwjbByz1Z0x9IMOmbaA47xZY...
swisssign-check=78sRDyID0jv43AVgF6JObBNQEew
3D34-QLF3-48XA-6DF9
apple-domain-verification=f900d6MfIz7vz0Tz
google-site-verification=ILqC8ooiEZAteibaNBuL9V8gzTYNWAGFijWzQT-_leo
swisssign-check=stW93mkg1dA6xAk72Kvp6PjSJu8
SPF v=spf1 a mx include:spf.crsend.com include:dst.aerzteverlag-it.de ip4:35.157.125...
swisssign-check=SzkjvPoHDmw0GOQXlugNmtkTsyA
cisco-ci-domain-verification=394684166bc4d58d0f84216b2aeef9bfc5bcacbbcf90a8b8157...
google-site-verification=SJXiPfokWeDhoE8frm299EH7NPFj5bFq2MTrX2fq_sc
knowbe4-site-verification=a21332cab4d90dc62dcf2be69dd5a190
CAALookup not available with standard resolver
Resolved in 53 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
1 redirect(s), 626 ms total
PASS
1 redirect(s), 626 ms total
Info::
Single redirect
Got: https://aerzteblatt.de → https://www.aerzteblatt.de/ (301)
Info::
WWW normalization redirect
Info::
Redirect overhead: 626 ms total
Got: 626 ms

https://aerzteblatt.de

133 ms · HTTP/1.1

301

https://www.aerzteblatt.de/

493 ms · HTTP/1.1 FINAL

#URLStatusTimeProtocolServer
1https://aerzteblatt.de301133 msHTTP/1.1
2https://www.aerzteblatt.de/200493 msHTTP/1.1

See the visual redirect chain in the HTTP Probe tab →

A+
Crawlability
robots.txt present, sitemap with 172 URLs
PASS
robots.txt present, sitemap with 172 URLs
Info::
robots.txt is present
Got: 2955 bytes
Info::
sitemap.xml is present
Info::
sitemap.xml is valid XML
Info::
sitemap.xml contains 172 entries
Info::
Sitemap index with 172 child sitemaps
Info::
robots.txt references sitemap
robots.txt 200 OK
Size 2955 B Sitemaps referenced 1 User-agents *, PerplexityBot, ChatGPT-User, OAI-SearchBot, Google-Extended, omgili, CCBot/3.0, Claude-Web, AhrefsBot, cohere-ai, OpenAI, AI-TrainingBot, DataMiningBot, FacebookBot, ia_archiver, Meta-ExternalAgent, DataMiner, GPTBot, anthropic-ai, ClaudeBot, Baiduspider, AIDataCollector, CCBot, magpie-crawler, omgilibot, AI-Bot, CCBot/1.0, Applebot-Extended, CCBot/2.0 Blocking No — crawling allowed
Sitemap: https://www.aerzteblatt.de/sitemap.xml
User-agent: PerplexityBot
Disallow: /
Allow: /news
Allow: /cme
Allow: /infocenter

User-agent: ChatGPT-User
Disallow: /
Allow: /news
Allow: /cme
Allow: /infocenter

User-agent: GPTBot
Disallow: /
Allow: /news
Allow: /cme
Allow: /infocenter

User-agent: OAI-SearchBot
Disallow: /
Allow: /news
Allow: /cme
Allow: /infocenter

User-agent: Google-Extended
Disallow: /
Allow: /news
Allow: /cme
Allow: /infocenter

User-agent: anthropic-ai
Disallow: /
Allow: /news
Allow: /cme
Allow: /infocenter

User-agent: Applebot-Extended
Disallow: /
Allow: /news
Allow: /cme
Allow: /infocenter

User-agent: Meta-ExternalAgent
Disallow: /
Allow: /news
Allow: /cme
Allow: /infocenter

User-agent: FacebookBot
Disallow: /
Allow: /news
Allow: /cme
Allow: /infocenter

User-agent: cohere-ai
Disallow: /
Allow: /news
Allow: /cme
Allow: /infocenter

User-agent: ClaudeBot
Disallow: /
Allow: /news
Allow: /cme
Allow: /infocenter

User-agent: Claude-Web
Disallow: /
Allow: /news
Allow: /cme
Allow: /infocenter

User-agent: magpie-crawler
Disallow: /
Allow: /news
Allow: /cme
Allow: /infocenter

User-agent: ia_archiver
Disallow: /
Allow: /news
Allow: /cme
Allow: /infocenter

User-agent: omgili
Disallow: /
Allow: /news
Allow: /cme
Allow: /infocenter

User-agent: omgilibot
Disallow: /
Allow: /news
Allow: /cme
Allow: /infocenter

User-agent: Baiduspider
Disallow: /
Allow: /news
Allow: /cme
Allow: /infocenter

User-agent: AhrefsBot
Disallow: /
Allow: /news
Allow: /cme
Allow: /infocenter

User-agent: OpenAI
Disallow: /
Allow: /news
Allow: /cme
Allow: /infocenter

User-agent: AI-TrainingBot
Disallow: /
Allow: /news
Allow: /cme
Allow: /infocenter

User-agent: AIDataCollector
Disallow: /
Allow: /news
Allow: /cme
Allow: /infocenter

User-agent: DataMiner
Disallow: /
Allow: /news
Allow: /cme
Allow: /infocenter

User-agent: DataMiningBot
Disallow: /
Allow: /news
Allow: /cme
Allow: /infocenter

User-agent: AI-Bot
Disallow: /
Allow: /news
Allow: /cme
Allow: /infocenter

User-agent: CCBot
Disallow: /
Allow: /news
Allow: /cme
Allow: /infocenter

User-agent: CCBot/1.0
Disallow: /
Allow: /news
Allow: /cme
Allow: /infocenter

User-agent: CCBot/2.0
Disallow: /
Allow: /news
Allow: /cme
Allow: /infocenter

User-agent: CCBot/3.0
Disallow: /
Allow: /news
Allow: /cme
Allow: /infocenter


User-Agent: *
Allow: /
        
User-agent: *
Disallow: /static/impressum.html
Disallow: /static/kontakt.html

# Legal notice: aerzteblatt.de expressly reserves the right to use its content for commercial text and data mining (§ 44 b UrhG).
# The use of robots or other automated means to access aerzteblatt.de or collect or mine data without
# the express permission of aerzteblatt.de is strictly prohibited.
# aerzteblatt.de may, in its discretion, permit certain automated access to certain aerzteblatt.de pages.
# If you would like to apply for permission to crawl aerzteblatt.de, collect or use data, please email aerzteblatt@aerzteblatt.de
sitemap.xml 200 OK
Type Sitemap Index URLs 172 entries Valid XML Yes
Child Sitemaps:
A+
Domain Intelligence
aerzteblatt.de — hosted on AWS
PASS
aerzteblatt.de — hosted on AWS
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: AWS
Got: AS16509
Domain expiry

Unknown

SSL certificate

182 days

Issued by Sectigo Limited

Domain age

Unknown

DNSSEC

Status unknown

Protects against DNS spoofing

Hosting

AWS

ASN AS16509

35.157.125.147

Registrar

Registrar unknown

Unlocked Name servers unknown
Expiry timeline
Today
+1 year
SSL expiry Danger zone (≤30 days)
Recommended actions
  • Enable registrar lock (clientTransferProhibited) to block unauthorized domain transfers
Registrar
Hosting
IP Address 35.157.125.147
ASN AS16509 (AMAZON-02 - Amazon.com, Inc., US)
Provider AWS
Data source: whois (0.7s)

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 210 ms — DNS, TCP, TLS, TTFB, content transfer breakdown
PASS
DNS Lookup DNS Lookup — time to resolve the domain name to an IP address.
60 ms
TCP Connect TCP Connect — time to establish a TCP connection to the server.
28 ms
TLS Handshake TLS Handshake — time to complete the HTTPS encryption handshake.
94 ms
Time to First Byte Time to First Byte — how long the server takes to respond with the first byte of data.
210 ms
Total Time Total request time from DNS lookup through full response.
210 ms

Connection waterfall

DNS Lookup 60 ms TCP Connect 28 ms TLS Handshake 94 ms Server Processing 29 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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