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Total

DNS

Email

Security

Network

100

Availability

Domainimpress.co.jp

IPv41

IPv60

MX records5

StatusActive

Domain technical report

株式会社インプレス

impress.co.jp

できるシリーズなどでおなじみの出版社である株式会社インプレスの公式企業サイトです。出版・メディアなどの事業紹介、会社情報、ニュースリリース、採用情報などをお知らせします。

Generated: 2026-08-08T23:56:36-05:00 · Cached result

JSON CSV PDF Visit site

IPv41

IPv60

MX5

NS4

DiagnosticsMain findings and recommendations

✓

IPv4 (A)30 / 30 pts · Dns

1 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

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

52 day(s) remaining.

✓

Certificate lifetime10 / 10 pts · Security

Full points require at least 30 days remaining.

HTTP security headers4 / 35 pts · Security

1 of 9 evaluated headers detected.

✓

PTR reverse DNS30 / 30 pts · Network

PTR: 2.0/25.234.183.203.in-addr.arpa

IPv4 diversity20 / 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/1.1 200 OK

✓

HTTPS final URL20 / 20 pts · Availability

Final URL uses HTTPS.

DNS and emailPublished records and email configuration

A

1 record(s)

203.183.234.2

AAAA

0 record(s)

—

Not configured

CNAME

0 record(s)

—

Not configured

MX

5 record(s)

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

TXT

4 record(s)

"google-site-verification=cpgt-LL6ru72T5FYcQSlD4VJA6cIRWx8ONIk9RClg5M"
"v=spf1 include:_spf.google.com include:_spf.impress.co.jp include:_spf_ext.impress.co.jp ip4:194.223.151.189 ip4:194.223.151.190/31 ip4:194.223.151.192/29 ip4:194.223.151.200/30 ~all"
"MFC=21517f98-e44d-46ed-8c2e-d4dd0d4e4dc8"
"MS=ms10695220"

NS

4 record(s)

ns-468.awsdns-58.com.
ns-1109.awsdns-10.org.
ns-674.awsdns-20.net.
ns-1841.awsdns-38.co.uk.

SOA

1 record(s)

ns-468.awsdns-58.com. awsdns-hostmaster.amazon.com. 1 7200 900 1209600 86400

SPF

Configured

v=spf1 include:_spf.google.com include:_spf.impress.co.jp include:_spf_ext.impress.co.jp ip4:194.223.151.189 ip4:194.223.151.190/31 ip4:194.223.151.192/29 ip4:194.223.151.200/30 ~all

DMARC

Configured

v=DMARC1; p=quarantine; rua=mailto:rua000000494-v5997e4f0@bmscore.jp; ruf=mailto:ruf000000494-by61z2yqt@bmscore.jp; fo=1;

DKIM

Selector google

v=DKIM1; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCZlSZNxaRxV2cS8lNBrAw7q0wiaczeWMc8iz5g02yN/DqyB9CyLbxC6DW8tndlsnbpPl+BzAl914vLQutaNyOI4evX/uxEFOMW9BEKpXTp9PGMfjvMKefpp3VEMF+TdIVQ9uqIhINEiBhAR2gNpLL6SDDvMFPXCrjPBPAZ1R5MBQIDAQAB

Analyzed webpageMetadata and HTTP response

Title and description

Extracted

Title

株式会社インプレス

Description

Final URL

https://impress.co.jp/

HTTP status

206

HTTP

Status

HTTP/1.1 200 OK

Final URL

https://impress.co.jp/

Version

Server

Apache

X-Powered-By

SSL and HTTP securityCertificate, protocol and security headers

SSL certificate

Available

Yes

Issuer

Cybertrust Japan Co., Ltd.

*.impress.co.jp

Valid from

2025-09-04T06:32:53-05:00

Valid until

2026-09-30T09:59:00-05:00

Days remaining

Protocol

TLSv1.2

Cipher

AES128-GCM-SHA256

Security headers

1 active

✓

HSTSImplemented

—

Content Security PolicyNot detected

—

X-Content-Type-OptionsNot detected

—

X-Frame-OptionsNot detected

—

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

203.183.234.2

53,29 ms

Cloudflare

1.1.1.1

203.183.234.2

63,23 ms

Quad9

9.9.9.9

203.183.234.2

24,61 ms

OpenDNS

208.67.222.222

203.183.234.2

98,11 ms

AdGuard

94.140.14.14

203.183.234.2

71,81 ms

IP, geolocation and ASNAssociated network information

203.183.234.2

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

alt2.aspmx.l.google.com

Port 25: Closed/unreachable - 0.6 ms - 
Port 465: Closed/unreachable - 4020.7 ms - 
Port 587: Closed/unreachable - 4019.7 ms -

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