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Total

DNS

Email

Security

Network

100

Availability

Domainyahoo.co.jp

IPv412

IPv60

MX records4

StatusActive

Domain technical report

Yahoo! JAPAN

yahoo.co.jp

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Generated: 2026-08-08T18:36:28-05:00 · Cached result

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IPv412

IPv60

MX4

NS4

DiagnosticsMain findings and recommendations

✓

IPv4 (A)30 / 30 pts · Dns

12 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 policy5 / 5 pts · Dns

Certificate authority restriction.

✓

DNS propagation10 / 10 pts · Dns

Agreement between public resolvers.

✓

MX records20 / 20 pts · Mail

4 MX record(s).

✓

SPF25 / 25 pts · Mail

SPF policy published.

✓

DMARC25 / 25 pts · Mail

DMARC policy published.

DKIM0 / 20 pts · Mail

No tested DKIM selector responded.

MTA-STS0 / 5 pts · Mail

Mail transport policy.

TLS-RPT0 / 5 pts · Mail

TLS reporting policy.

✓

Valid TLS certificate55 / 55 pts · Security

117 day(s) remaining.

✓

Certificate lifetime10 / 10 pts · Security

Full points require at least 30 days remaining.

HTTP security headers12 / 35 pts · Security

3 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 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

12 record(s)

124.83.185.124
124.83.184.124
183.79.219.124
182.22.24.252
182.22.16.251
182.22.24.124
183.79.219.252
124.83.184.252
182.22.31.124
182.22.31.252
182.22.16.123
124.83.185.252

AAAA

0 record(s)

—

Not configured

CNAME

0 record(s)

—

Not configured

MX

4 record(s)

10 mx5.mail.yahoo.co.jp.
10 mx1.mail.yahoo.co.jp.
10 mx2.mail.yahoo.co.jp.
10 mx3.mail.yahoo.co.jp.

TXT

2 record(s)

"google-site-verification=GvbYgNin-mY73VbS4IJK2D8nI3tHEf2NpRdy76VYqBU"
"v=spf1 include:spf.yahoo.co.jp ~all"

NS

4 record(s)

ns02.yahoo.co.jp.
ns12.yahoo.co.jp.
ns11.yahoo.co.jp.
ns01.yahoo.co.jp.

SOA

1 record(s)

yahoo.co.jp. postmaster.yahoo.co.jp. 2608070027 1800 900 86400 900

CAA

4 record(s)

0 issue "digicert.com;cansignhttpexchanges=yes"
0 issue "globalsign.com"
0 iodef "mailto:nic-admin@mail.yahoo.co.jp"
0 issue "cybertrust.ne.jp"

SSHFP

0 record(s)

—

Not configured

SPF

Configured

v=spf1 include:spf.yahoo.co.jp ~all

DMARC

Configured

v=DMARC1; p=quarantine; rua=mailto:ymail_dmarc_report@yahoo.co.jp

DKIM

Not found

—

Not configured

Analyzed webpageMetadata and HTTP response

Title and description

Extracted

Title

Yahoo! JAPAN

Description

Final URL

https://www.yahoo.co.jp:443/

HTTP status

200

HTTP

Status

HTTP/2 200

Final URL

https://www.yahoo.co.jp:443/

Version

Server

X-Powered-By

SSL and HTTP securityCertificate, protocol and security headers

SSL certificate

Available

Yes

Issuer

Cybertrust Japan Co., Ltd.

edge01.yahoo.co.jp

Valid from

2025-11-05T05:06:13-06:00

Valid until

2026-12-04T08:59:00-06:00

Days remaining

117

Protocol

TLSv1.3

Cipher

TLS_AES_128_GCM_SHA256

Security headers

3 active

—

HSTSNot detected

—

Content Security PolicyNot detected

✓

X-Content-Type-OptionsImplemented

✓

X-Frame-OptionsImplemented

—

Referrer PolicyNot detected

✓

Permissions PolicyImplemented

—

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

124.83.184.124, 124.83.184.252, 124.83.185.124, 124.83.185.252, 182.22.16.123, 182.22.16.251, 182.22.24.124, 182.22.24.252, 182.22.31.124, 182.22.31.252, 183.79.219.124, 183.79.219.252

27,59 ms

Cloudflare

1.1.1.1

124.83.184.124, 124.83.184.252, 124.83.185.124, 124.83.185.252, 182.22.16.123, 182.22.16.251, 182.22.24.124, 182.22.24.252, 182.22.31.124, 182.22.31.252, 183.79.219.124, 183.79.219.252

336,96 ms

Quad9

9.9.9.9

124.83.184.124, 124.83.184.252, 124.83.185.124, 124.83.185.252, 182.22.16.123, 182.22.16.251, 182.22.24.124, 182.22.24.252, 182.22.31.124, 182.22.31.252, 183.79.219.124, 183.79.219.252

199,10 ms

OpenDNS

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

mx5.mail.yahoo.co.jp

Port 25: Closed/unreachable - 181.2 ms - 
Port 465: Closed/unreachable - 4021.2 ms - 
Port 587: Closed/unreachable - 4199.5 ms -

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