d21.co.jp

https://d21.co.jp· First analyzed 26 May 2026· Updated 26 May 2026

This site uses bot protection

The website blocked automated page access (e.g. Cloudflare Turnstile). Only DNS-based modules could be analyzed — hosting, SSL, email infrastructure, and domain info are shown below. Technology stack, SEO, and other page-content modules are unavailable for this site.

Hosting Provider

Amazon Web Services (AWS)

aws.amazon.com

IP Address

13.193.35.176

Site Location

🇯🇵 Japanvia tld

Server Location

🇯🇵 Tokyo, Japan

ASN

AS16509

Organization

AWS EC2 (ap-northeast-1)

Nameservers

ns-1456.awsdns-54.org.ns-1769.awsdns-29.co.uk.ns-472.awsdns-59.com.ns-904.awsdns-49.net.

Security Score

71%Good

HTTPS

No WAF

250d

Certificate Details

Type

Organization Validated (OV)

Certificate Authority

Japan Registry Services Co., Ltd.

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.2

HTTP Protocol

HTTP/2

Valid From

13.01.2026

Valid Until

31.01.2027

OCSP Stapling

Enabled

Subject Alternative Names (2)

d21.co.jpwww.d21.co.jp

SHA-256 Fingerprint

2C:66:F3:1A:33:80:41:C6:76:8B:ED:E4:CC:15:78:14:A3:30:E9:49...

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Email Infrastructure

Google Workspace

Score

SPF

DKIM

DMARC

DMARC Policy

None (Monitor Only)

MX Records (7)

aspmx5.googlemail.com

aspmx2.googlemail.com

aspmx3.googlemail.com

alt1.aspmx.l.google.com

+3 more

Domain Information

d21.co.jp

DNSSEC

Not Enabled

Website Identity

d21.co.jp

Location detected: 🇯🇵 Japanvia tld

📧 Google Workspace