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81
Total
70
DNS
90
Email
73
Security
65
Network
100
Availability
Domainduden.de
IPv42
IPv60
MX records1
StatusActive
Domain technical report

Duden | Sprache sagt alles.

duden.de

Duden ist die Marke der deutschen Sprache ➤ Wörterbücher, Sachbücher, Ratgeber, Lernhilfen und viele digitale Produkte (Software und Apps) ➤ Duden ist mehr als ein Wörterbuch!

Generated: 2026-08-09T11:49:45-05:00 · Cached result

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IPv42
IPv60
MX1
NS4

DiagnosticsMain findings and recommendations

✓
IPv4 (A)30 / 30 pts · Dns

2 IPv4 address(es) detected.

!
IPv6 (AAAA)0 / 10 pts · Dns

0 IPv6 address(es) detected.

✓
Name server redundancy20 / 20 pts · Dns

4 NS record(s); 2 or more required.

✓
SOA record10 / 10 pts · Dns

Authoritative zone record.

!
DNSSEC chain0 / 15 pts · Dns

Both DS and DNSKEY are required.

!
CAA policy0 / 5 pts · Dns

Certificate authority restriction.

✓
DNS propagation10 / 10 pts · Dns

Agreement between public resolvers.

✓
MX records20 / 20 pts · Mail

1 MX record(s).

✓
SPF25 / 25 pts · Mail

SPF policy published.

✓
DMARC25 / 25 pts · Mail

DMARC policy published.

✓
DKIM20 / 20 pts · Mail

A DKIM selector was verified.

!
MTA-STS0 / 5 pts · Mail

Mail transport policy.

!
TLS-RPT0 / 5 pts · Mail

TLS reporting policy.

✓
Valid TLS certificate55 / 55 pts · Security

109 day(s) remaining.

✓
Certificate lifetime10 / 10 pts · Security

Full points require at least 30 days remaining.

i
HTTP security headers8 / 35 pts · Security

2 of 9 evaluated headers detected.

✓
PTR reverse DNS30 / 30 pts · Network

PTR: ec2-63-186-73-220.eu-central-1.compute.amazonaws.com

✓
IPv4 diversity35 / 35 pts · Network

Two or more IPv4 addresses receive full points.

!
IPv6 connectivity0 / 35 pts · Network

AAAA availability.

✓
DNS resolution40 / 40 pts · Availability

At least one address family must resolve.

✓
HTTP response40 / 40 pts · Availability

HTTP/2 200

✓
HTTPS final URL20 / 20 pts · Availability

Final URL uses HTTPS.

DNS and emailPublished records and email configuration

A

2 record(s)
63.186.73.220
18.198.185.37

AAAA

0 record(s)
—

Not configured

CNAME

0 record(s)
—

Not configured

MX

1 record(s)
10 duden-de.mail.protection.outlook.com.

TXT

11 record(s)
"v=spf1 mx a ip4:87.230.83.100 ip4:5.35.254.138 ip4:80.237.251.224/27 ip4:87.106.189.99 " "ip4:85.17.187.195 ip4:95.211.74.199 ip4:62.204.93.131 ip4:5.148.147.128/27 ip4:87.252.58.128/26 " "ip4:194.39.189.0/24 ip4:35.156.120.155 " "include:spf.mtasv.net include:spf.protection.outlook.com include:_spf.rexx-suite.com ~all"
"miro-verification=df094973366a264bb093ee50ef9bc221d85d515c"
"mindmanager-verification=b9efeea84fa602423d14f9bac7387c9ae2b0378134268885e3129f5cd7ccd2c0"
"MS=ms25499777"
"GfjwwYenC/INGomtGPrSx+6v0TcbO3K2DIbMN3g3Kmrw2sxRDk9Vz/jnP/lUno64s1RXmJPXiWMSwm3RXOxXyg=="
"docker-verification=1164772e-c2ac-4444-a18d-8b97cc7ece60"
"amazon-business-verification=981f0f3de87b31cf895155f8fd7fb9175201e5f6345397c6c74fb239f69573e9"
"google-site-verification=KR1Rer-cA0cElRKMGIy5sPx-RKaMKFFwH6AtJZvCEo8"
"adobe-idp-site-verification=075eefcd8c33f186361df81cd071b736d6ad72a67e45403e81a51e1abc127a35"
"cursor-domain-verification-a6ps29=vx9SdV6E5TzmYStUNal9xDM5D"
"extensis-domain-verification=d39c624e-715d-4d88-be9a-63bf49dc2697"

NS

4 record(s)
ns-1670.awsdns-16.co.uk.
ns-1017.awsdns-63.net.
ns-112.awsdns-14.com.
ns-1096.awsdns-09.org.

SOA

1 record(s)
ns-1096.awsdns-09.org. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400

CAA

0 record(s)
—

Not configured

DS

0 record(s)
—

Not configured

DNSKEY

0 record(s)
—

Not configured

RRSIG

0 record(s)
—

Not configured

NSEC

0 record(s)
—

Not configured

NSEC3

0 record(s)
—

Not configured

SRV

0 record(s)
—

Not configured

NAPTR

0 record(s)
—

Not configured

TLSA

0 record(s)
—

Not configured

SSHFP

0 record(s)
—

Not configured

SPF

Configured
v=spf1 mx a ip4:87.230.83.100 ip4:5.35.254.138 ip4:80.237.251.224/27 ip4:87.106.189.99 ip4:85.17.187.195 ip4:95.211.74.199 ip4:62.204.93.131 ip4:5.148.147.128/27 ip4:87.252.58.128/26 ip4:194.39.189.0/24 ip4:35.156.120.155 include:spf.mtasv.net include:spf.protection.outlook.com include:_spf.rexx-suite.com ~all

DMARC

Configured
v=DMARC1; p=quarantine; rua=mailto:ccc0cdfb1f75077@rep.dmarcanalyzer.com; ruf=mailto:ccc0cdfb1f75077@for.dmarcanalyzer.com; sp=quarantine; fo=1;

DKIM

Selector selector2
v=DKIM1; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDAOH07iRUmFehItaSk73UEcBBwoOA/VVdvBijk+rOPMpDcu0GcdDuQ8ut4AqtRMQ4qjh7EWsHR/FyfRJZ2CUpO3SS3Js4P0Y8dWQ2Aw+o/DR4HLXB1sVgqkHHXhyDQL+eVUZ2geWfoB5nQMb4K4jdjV3DV7Mx86QleiilAZ+JasQIDAQAB;

Analyzed webpageMetadata and HTTP response

Title and description

Extracted
Title
Duden | Sprache sagt alles.
Description
Duden ist die Marke der deutschen Sprache ➤ Wörterbücher, Sachbücher, Ratgeber, Lernhilfen und viele digitale Produkte (Software und Apps) ➤ Duden ist mehr als ein Wörterbuch!
Final URL
https://www.duden.de/
HTTP status
206

HTTP

Status
HTTP/2 200
Final URL
https://www.duden.de/
Version
3
Server
Varnish
X-Powered-By

SSL and HTTP securityCertificate, protocol and security headers

SSL certificate

Available
Available
Yes
Issuer
Amazon
CN
duden.de
Valid from
2026-05-12T19:00:00-05:00
Valid until
2026-11-26T17:59:59-06:00
Days remaining
109
Protocol
TLSv1.2
Cipher
ECDHE-RSA-AES128-GCM-SHA256

Security headers

2 active
—
HSTSNot detected
—
Content Security PolicyNot detected
✓
X-Content-Type-OptionsImplemented
✓
X-Frame-OptionsImplemented
—
Referrer PolicyNot detected
—
Permissions PolicyNot detected
—
Cross-Origin-Opener-PolicyNot detected
—
Cross-Origin-Embedder-PolicyNot detected
—
Cross-Origin-Resource-PolicyNot detected

DNS propagationComparison across public resolvers

Public resolver comparison

Consistent
✓
Consistent propagation

5 public resolvers queried.

ResolverServerResultLatency
Google
8.8.8.8
18.198.185.37, 63.186.73.220
55,75 ms
Cloudflare
1.1.1.1
18.198.185.37, 63.186.73.220
40,96 ms
Quad9
9.9.9.9
18.198.185.37, 63.186.73.220
86,41 ms
OpenDNS
208.67.222.222
18.198.185.37, 63.186.73.220
121,05 ms
AdGuard
94.140.14.14
18.198.185.37, 63.186.73.220
234,45 ms

IP, geolocation and ASNAssociated network information

63.186.73.220

No data
success
No
country
region
city
asn
organization
isp

18.198.185.37

No data
success
No
country
region
city
asn
organization
isp

Visitor information

Visitor
ip
216.73.217.62
reverse
country
country_code
region
city
latitude
longitude
isp
organization
asn
timezone
browser
Other
os
Other
language
user_agent
Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
is_bot
Yes
cloudflare
No

SMTPEmail port connectivity

duden-de.mail.protection.outlook.com

Port 25: Closed/unreachable - 20.7 ms - 
Port 465: Closed/unreachable - 4023.2 ms - 
Port 587: Closed/unreachable - 4019.7 ms -

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