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doorkeeper.jp

https://doorkeeper.jp· First analyzed 20 Feb 2026· Updated 20 Feb 2026
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doorkeeper.jp

Sponsored

Hosting Provider

IP Address

66.71.205.0

Server Location

🇺🇸 Dover, United States

ASN

AS17294

Organization

Build io, Inc.

Server

Envoy

Nameservers

ns1.dnsimple.com.ns2.dnsimple.com.ns3.dnsimple.com.ns4.dnsimple.com.

Performance

Page Speed

34 requests

Image Optimization

Lazy Load
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Infrastructure
Hosting
Build io, Inc.

Technology Stack

7 Technologies Detected

Libraries

1

CSS Frameworks

1

Icon Libraries

1

Tag Managers

1

SEO Analysis

D58/100
7
5
0
D
doorkeeper.jpdoorkeeper.jp

セミナー・勉強会・イベント管理ツール | Doorkeeper

セミナーやイベントの開催も、集客も、集金も。Doorkeeperなら全部まとめて簡単に。

Title Length31 chars

Recommended: 50-60 chars

Description Length44 chars

Recommended: 120-160 chars

Issues (0)

    Crawlability

    Sitemap
    robots.txt

    15 rules

    Sitemap reference found

    Sponsored

    Sponsored

    C

    Security Score

    61%Fair
    Interactive

    HTTPS

    No WAF

    64d

    Certificate Details

    Type

    Domain Validated (DV)

    Certificate Authority

    Let's Encrypt

    Key Algorithm

    RSA (2048 bit)

    Signature

    SHA-256 with RSA

    TLS Version

    TLSv1.3

    HTTP Protocol

    HTTP/1.1

    Valid From

    26.01.2026

    Valid Until

    26.04.2026

    Subject Alternative Names (1)

    *.doorkeeper.jp

    SHA-256 Fingerprint

    15:2D:03:8C:0B:72:8E:51:A1:61:2F:89:50:C8:83:A4:2B:20:6E:50...

    Top Recommendations

    Security recommendation preview

    HTTP Headers

    Developer Console

    cache-control
    🟡 0s(max-age=0, private, must-revalidate)
    content-encoding
    📦 Gzip(gzip)
    content-type
    text/html; charset=utf-8
    date
    Fri, 20 Feb 2026 01:36:52 GMT
    etag
    W/"5ba3d8378eddd9664564021fd300b032"
    referrer-policy
    no-referrer-when-downgrade
    Good Warning Issue

    Email Infrastructure

    Google Workspace

    Score

    68

    SPF
    DKIM
    DMARC

    DMARC Policy

    Quarantine (Moderate)

    MX Records (6)

    aspmx2.googlemail.com
    alt2.aspmx.l.google.com
    aspmx.l.google.com
    alt1.aspmx.l.google.com

    +2 more

    Domain Information

    doorkeeper.jp

    DNSSEC
    Not Enabled

    Privacy & Compliance

    Cookie Consent Banner
    Privacy Policy
    Terms of Service

    GDPR Indicators

    Privacy policy page linked

    Typography & Readability

    -apple-system

    95/100
    Readability
    /30
    40/40

    16px · LH 1.60

    Hierarchy
    /20
    25/25

    2.01x ratio

    WCAG
    /25
    15/15

    Contrast: undefined

    Performance
    /25
    20/20

    System fonts

    Heading Font

    -apple-system

    Sans32px

    Body Font

    -apple-system

    Sans16px

    Contrast Ratio

    --

    Reading Comfort

    ~33 CPL

    Needs attention
    32px
    h1
    16px
    h3
    18px
    h4
    16px
    p

    ✅ Excellent readability: 16px body text is ideal for all devices.

    ✅ Optimal line spacing: 1.60 ratio ensures comfortable reading.

    ✅ Strong hierarchy: Headlines are 2.0x larger than body text.

    ✅ Excellent performance: System fonts eliminate font loading delays (better LCP).

    ✅ Consistent design: Single font family with weight variations is a modern best practice.

    ✅ Protected text on images: Using gradient for readability.

    Business & Marketing Stack

    4 Tools Detected

    Advanced

    Customer Support

    1

    Live chat and helpdesk tools

    Behavior Analytics

    3

    User behavior and product analytics

    2

    Categories

    4

    Total Tools

    0

    Enterprise

    1

    Mid-Market

    Assessment: Well-developed marketing technology stack

    Sponsored

    Scripts & Styles

    12 Resources

    10
    Scripts
    2
    Styles
    8
    Async
    0
    Defer

    Top Script Sources

    beacon-v2.helpscout.net(3)googletagmanager.com(3)doorkeeper.jp(2)google-analytics.com(1)cdn.mxpnl.com(1)

    Sponsored

    Last analyzed: 20 Feb 2026 at 01:37

    Historical Analysis & Change Tracking