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Total

100

DNS

Email

Security

Network

100

Availability

Domainzenn.dev

IPv43

IPv63

MX records5

StatusActive

Domain technical report

Zenn｜エンジニアのための情報共有コミュニティ

zenn.dev

Zennはエンジニアが技術・開発についての知見をシェアする場所です。本の販売や、読者からのバッジの受付により対価を受け取ることができます。

Generated: 2026-08-11T00:01:56-05:00 · Cached result

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IPv43

IPv63

MX5

NS2

DiagnosticsMain findings and recommendations

✓

IPv4 (A)30 / 30 pts · Dns

3 IPv4 address(es) detected.

✓

IPv6 (AAAA)10 / 10 pts · Dns

3 IPv6 address(es) detected.

✓

Name server redundancy20 / 20 pts · Dns

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

✓

SOA record10 / 10 pts · Dns

Authoritative zone record.

✓

DNSSEC chain15 / 15 pts · Dns

DS and DNSKEY detected.

✓

CAA policy5 / 5 pts · Dns

Certificate authority restriction.

✓

DNS propagation10 / 10 pts · Dns

Agreement between public resolvers.

✓

MX records20 / 20 pts · Mail

5 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

60 day(s) remaining.

✓

Certificate lifetime10 / 10 pts · Security

Full points require at least 30 days remaining.

HTTP security headers16 / 35 pts · Security

4 of 9 evaluated headers detected.

PTR reverse DNS0 / 30 pts · Network

PTR not detected.

✓

IPv4 diversity35 / 35 pts · Network

Two or more IPv4 addresses receive full points.

✓

IPv6 connectivity35 / 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

3 record(s)

172.67.72.220
104.26.14.203
104.26.15.203

AAAA

3 record(s)

2606:4700:20::ac43:48dc
2606:4700:20::681a:fcb
2606:4700:20::681a:ecb

CNAME

0 record(s)

—

Not configured

MX

5 record(s)

10 alt3.aspmx.l.google.com.
5 alt2.aspmx.l.google.com.
1 aspmx.l.google.com.
5 alt1.aspmx.l.google.com.
10 alt4.aspmx.l.google.com.

TXT

3 record(s)

"v=spf1 include:_spf.google.com ~all"
"google-site-verification=udMf6x_Z0J82_tdCFgcpik-TNvh-LZk15yyd7oD2PCo"
"google-site-verification=BViXpCnxS81SVVVCJ9B2q0122hOaPKM8QePvwyYOJaA"

NS

2 record(s)

susan.ns.cloudflare.com.
gabriel.ns.cloudflare.com.

SOA

1 record(s)

gabriel.ns.cloudflare.com. dns.cloudflare.com. 2411195920 10000 2400 604800 1800

CAA

10 record(s)

0 issuewild "pki.goog; cansignhttpexchanges=yes"
0 issue "letsencrypt.org"
0 issuewild "digicert.com; cansignhttpexchanges=yes"
0 issuewild "ssl.com"
0 issue "comodoca.com"
0 issue "pki.goog; cansignhttpexchanges=yes"
0 issuewild "comodoca.com"
0 issue "ssl.com"
0 issue "digicert.com; cansignhttpexchanges=yes"
0 issuewild "letsencrypt.org"

DS

1 record(s)

2371 13 2 FC302CD6EA4295744782B1688CE8387AC7F83C45D0A1F95B8B10F268 32D1EF4E

DNSKEY

2 record(s)

256 3 13 oJMRESz5E4gYzS/q6XDrvU1qMPYIjCWzJaOau8XNEZeqCYKD5ar0IRd8 KqXXFJkqmVfRvMGPmM1x8fGAa2XhSA==
257 3 13 mdsswUyr3DPW132mOi8V9xESWE8jTo0dxCjjnopKl+GqJxpVXckHAeF+ KkxLbxILfDLUT0rAK9iUzy1L53eKGQ==

RRSIG

2 record(s)

NS 13 2 86400 20260812044848 20260810024848 34505 zenn.dev. Ge46xzw+SfDnypzqOcPRXcbL3M1AdDQ4mo7/aBVTpDk80GdtPoEyGjMR cm/cTTSjC/R/kyVYB633xeA1mpwiVg==
CAA 13 2 3600 20260812060146 20260810040146 34505 zenn.dev. 0OZbZoAaCsNabuoptldtiEmzCm9hnYOGcIbILCFjUF9GFCUUMYHzkg9Q 7nEe+3W1z8OnAb5CO9TEfLfMaJkG/w==

NSEC

1 record(s)

\000.zenn.dev. A NS SOA PTR HINFO MX TXT AAAA LOC SRV NAPTR CERT SSHFP RRSIG NSEC DNSKEY TLSA SMIMEA HIP CDS CDNSKEY OPENPGPKEY SVCB HTTPS URI CAA

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 include:_spf.google.com ~all

DMARC

Configured

v=DMARC1;p=quarantine;rua=mailto:c4d6881988@rua.easydmarc.com;ruf=mailto:c4d6881988@ruf.easydmarc.com;fo=1;

DKIM

Selector google

v=DKIM1; k=rsa; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAli9YNdKVkq+aBVzB30AjsfeC/xKyFCaAfSnbYpCPh8+ASNIaBsNoj7+9wZHTI/D87iDiSFI+x1jXJakqZ/OMcrA0z40o/Ff92Khh6yzlXasPAffuPC6iApb82+iwLAd3BmZ/Fs6kkgm0fiyHveB6vcCCJZaN5tp/zXDmrvWJP12NcDQahuaAhuQe04YY6fhQ95gkBHuiBdrEV0Jq+xxxRJXWKiuxdbeOkKjKtyTzj92tyHnlCJbc4JE7gX6zFUlABzvvv20mOQ3od9gdBO9oF8PfcwALPm9R6NY+cAW8m96MduVbrNEifilrM3RP7iBZpdgS1F6yGpF028dtt0AKkQIDAQAB

Analyzed webpageMetadata and HTTP response

Title and description

Extracted

Title

Zenn｜エンジニアのための情報共有コミュニティ

Description

Zennはエンジニアが技術・開発についての知見をシェアする場所です。本の販売や、読者からのバッジの受付により対価を受け取ることができます。

Final URL

https://zenn.dev/

HTTP status

200

HTTP

Status

HTTP/2 200

Final URL

https://zenn.dev/

Version

Server

cloudflare

X-Powered-By

Next.js

SSL and HTTP securityCertificate, protocol and security headers

SSL certificate

Available

Yes

Issuer

Google Trust Services

zenn.dev

Valid from

2026-07-12T01:32:52-05:00

Valid until

2026-10-10T02:32:47-05:00

Days remaining

Protocol

TLSv1.3

Cipher

TLS_AES_256_GCM_SHA384

Security headers

4 active

✓

HSTSImplemented

✓

Content Security PolicyImplemented

✓

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

104.26.14.203, 104.26.15.203, 172.67.72.220

72,16 ms

Cloudflare

1.1.1.1

104.26.14.203, 104.26.15.203, 172.67.72.220

44,64 ms

Quad9

9.9.9.9

104.26.14.203, 104.26.15.203, 172.67.72.220

29,17 ms

OpenDNS

208.67.222.222

104.26.14.203, 104.26.15.203, 172.67.72.220

62,58 ms

AdGuard

94.140.14.14

104.26.14.203, 104.26.15.203, 172.67.72.220

91,16 ms

IP, geolocation and ASNAssociated network information

172.67.72.220

No data

success

country

region

city

asn

organization

isp

104.26.14.203

No data

success

country

region

city

asn

organization

isp

104.26.15.203

No data

success

country

region

city

asn

organization

isp

Visitor information

Visitor

216.73.217.62

reverse

country

country_code

region

city

latitude

longitude

isp

organization

asn

timezone

browser

Other

language

user_agent

Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)

is_bot

Yes

cloudflare

SMTPEmail port connectivity

alt3.aspmx.l.google.com

Port 25: Closed/unreachable - 0.8 ms - 
Port 465: Closed/unreachable - 4009 ms - 
Port 587: Closed/unreachable - 4021.2 ms -

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