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gebco.net

https://gebco.net· First analyzed 12 May 2026· Updated 12 May 2026
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gebco.net
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Mobile screenshot of gebco.net
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Hosting Provider

Google Cloud Platform
cloud.google.com

IP Address

34.147.168.147

Site Location

🇬🇧 United Kingdomvia ip

Server Location

🇬🇧 London, United Kingdom

ASN

AS396982

Organization

Google Cloud (europe-west2)

Nameservers

pdns2.registrar-servers.com.pdns1.registrar-servers.com.

Performance

100

Core Web Vitals

Weight

First Contentful Paint
462 ms10%
Speed Index
601 ms10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
1.4 MB
25 requests

Image Optimization

Lazy LoadResponsive
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Drupal

Technology Stack

5 Technologies Detected

Analytics

2
Google Analytics
Google Analytics 4

CSS Frameworks

1
Tailwind CSS

Icon Libraries

1
Font Awesome

Fonts

1
Google Fonts

SEO Analysis

A82/100
25
3
0
Meta Tags14/15
Content11/12
Headings8/8
Technical18/25
E-E-A-T3/7
Images6/7
Links5/5
URL5/5
Social5/5
Freshness0/4
Mobile4/4
Indexability3/3
G
gebco.netgebco.net

GEBCO | General Bathymetric Chart of the Oceans

The General Bathymetric Chart of the Oceans (GEBCO) aims to provide the most authoritative, publicly available bathymetry data sets for the world's oceans.

Title Length47 chars

Recommended: 50-60 chars (~298px / 580px)

Description Length155 chars

Recommended: 120-160 chars

Issues (0)

    3 issues found

    Upgrade to view details

    Crawlability

    Sitemap

    Type: standard

    275 URLs

    robots.txt

    53 rules

    Local SEO

    Local Search Readiness

    6/100
    Poor
    2 13 2

    This site doesn't appear to be a local business. Local SEO signals are optional for non-local websites.

    Sponsored

    AI & LLM Readiness

    D47/100
    Bot Access
    20/25
    Machine Read.
    11/25
    Schema Data
    0/25
    Citation
    16/25

    AI Bot Access

    14/14 accessible
    AI Search
    OAI-SearchBot
    PerplexityBot
    Claude-SearchBot
    Gemini-Deep-Research
    DuckAssistBot
    Training
    GPTBot
    ClaudeBot
    Google-Extended
    Meta-ExternalAgent
    Bytespiderinfo
    Amazonbot
    Applebot-Extended
    CCBotinfo
    Fetch
    ChatGPT-User

    Machine Readability

    llms.txt
    llms-full.txt
    Semantic HTML
    Heading Hierarchy
    navheader/footer
    Text ratio:6%
    Words:841
    Token eff.:Optimal
    Sections/1K:30.9
    Depth:2/5

    Structured Data

    No Schema

    Citation Readiness

    Opening Summary25w
    Descriptive Headingsavg 3.6w
    Canonical URL
    Open Graph3/3
    Twitter Card3/3
    Language Tag
    Publish Date
    Author Info
    Lists
    Tables
    TL;DR / Summary
    About Page Link
    Recommendations (8)
    AI readiness recommendation preview...
    Upgrade to view recommendations

    Sponsored

    Accessibility

    WCAG 2.1 Compliance

    Evaluates how accessible your website is for users with disabilities, based on WCAG 2.1 guidelines. Checks images, forms, keyboard navigation, ARIA roles, and color contrast.
    A
    83/100
    14
    Passed
    1
    Critical
    2
    Warnings
    Images & Alt Text
    20/20
    Checks if images have descriptive alt text for screen readers and visually impaired users.
    Semantic Structure
    17/20
    Evaluates proper use of HTML5 semantic elements (header, nav, main, footer) and heading hierarchy.
    Forms & Inputs
    15/15
    Verifies form fields have labels, error messages are clear, and inputs are properly associated.
    Color & Contrast
    15/15
    Tests text-to-background color contrast ratios against WCAG AA/AAA minimum requirements.
    Keyboard & Focus
    13/15
    Ensures all interactive elements are reachable and operable via keyboard (tab, enter, escape).
    ARIA & Roles
    3/15
    Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.
    1 recommendation
    • •Accessibility recommendation preview...
    Upgrade to view recommendations

    Carbon Footprint

    SWDM v4 · Eco-Score

    Carbon emissions estimated using the Sustainable Web Design Model v4 (SWDM v4). Factors in data center, network, and device energy across new and returning visitors. Grade thresholds based on HTTP Archive percentiles.
    60/100
    B
    141 mg
    CO₂e / view
    1.4 MB
    Page Weight
    60%
    Cleaner Than
    New Visitor
    161 mg
    vs
    Returning (cached)
    81 mg
    Annual (10K/mo)
    16.9 kg
    Emission Segments
    Data Center
    7 mg
    Network
    41 mg
    Device
    93 mg
    Resource Breakdown
    JavaScript
    98.3 KB
    Images
    461.9 KB
    CSS
    763.0 KB
    Fonts
    1.9 KB
    HTML
    71.0 KB
    Green Hosting Verified
    Google Cloud
    GWF Verified
    3 recommendations
    • •Carbon footprint recommendation preview...
    Upgrade to view recommendations
    D

    Security Score

    41%Poor
    Interactive

    HTTPS

    No WAF

    64d

    Certificate Details

    Type

    Domain Validated (DV)

    Certificate Authority

    Let's Encrypt

    Key Algorithm

    ECDSA (secp256r1) (256 bit)

    Signature

    ECDSA with SHA-384

    TLS Version

    TLSv1.3

    HTTP Protocol

    HTTP/2

    Valid From

    17.04.2026

    Valid Until

    16.07.2026

    Subject Alternative Names (2)

    gebco.netwww.gebco.net

    SHA-256 Fingerprint

    50:3F:74:2A:19:48:E8:77:1D:8C:A3:11:85:F5:78:DB:03:4C:99:8A...

    Top Recommendations

    Security recommendation preview

    Upgrade to view recommendations
    Upgrade to view header details

    HTTP Headers

    Developer Console

    cache-control
    🔴 No Cache(must-revalidate, no-cache, private)
    content-language
    en
    content-length
    72431
    content-type
    text/html; charset=UTF-8
    date
    Tue, 12 May 2026 13:00:10 GMT
    expires
    Sun, 19 Nov 1978 05:00:00 GMT
    Good Warning Issue

    Email Infrastructure

    Google Workspace

    Score

    100

    SPF
    DKIM
    DMARC

    DMARC Policy

    Reject (Strictest)

    MX Records (5)

    alt1.aspmx.l.google.com
    alt2.aspmx.l.google.com
    alt3.aspmx.l.google.com
    alt4.aspmx.l.google.com

    +1 more

    Domain Information

    gebco.net

    Domain Age
    21y 8m

    Created

    28.08.2004

    Expires

    28.08.2026

    Last Updated

    13.08.2025

    Registrar

    NameCheap, Inc.

    DNSSEC
    Not Enabled

    Privacy & Compliance

    Cookie Consent Banner
    Privacy Policy
    Terms of Service

    GDPR Indicators

    Privacy policy page linked

    Mobile Compatibility

    Viewport & Responsive Test

    Tests how well your website works on mobile devices. Checks viewport configuration, responsive layout, touch targets, font readability, and simulates rendering across different screen sizes.
    B
    75/100
    Mobile Friendly1 breakpoint
    Viewport Meta
    The viewport meta tag tells mobile browsers how to scale the page. Without it, mobile devices render at desktop width.
    Responsive Design
    Uses CSS media queries or flexible layouts to adapt content to different screen sizes automatically.
    Touch Icons
    Apple touch icons and favicons displayed when users add the site to their home screen on mobile devices.
    Readable Font Size
    Base font size should be at least 16px on mobile to ensure text is readable without zooming.
    Relative Units
    Using em, rem, %, or vw instead of fixed px values allows content to scale properly across screen sizes.
    No H-Scroll Risk
    No elements wider than the viewport that would cause horizontal scrolling on mobile devices.
    Tap Targets OK
    Interactive elements (buttons, links) are at least 48x48px with enough spacing to prevent accidental taps.
    No Fixed Widths
    No elements with fixed pixel widths that could overflow on smaller screens and break the layout.
    Viewport
    width=device-width, initial-scale=1, shrink-to-fit=no

    Typography & Readability

    Helvetica

    WCAG Partial
    67/100
    Readability
    /30
    27/30

    16px · LH 1.50

    Hierarchy
    /20
    20/20

    2.5x ratio · ✓ H1→H6

    WCAG
    /25
    9/25

    1:1 min contrast

    Performance
    /25
    11/25

    3 fonts · 1 req

    Heading Font

    Helvetica

    Sans40px

    Body Font

    Helvetica

    Sans16px

    Contrast Ratio

    1:1

    36 issues

    Reading Comfort

    ~39 CPL

    Narrow lines
    40px
    h1
    56px
    h2
    20px
    h3
    16px
    p

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

    ✅ Optimal line spacing: 1.50 ratio (ideal range 1.4–1.6).

    ⚠️ Partial contrast: 36 elements below WCAG AA threshold (min 1.0:1).

    ✅ Perfect heading hierarchy: Sequential h1→h2→h3 with single H1 — ideal for SEO & accessibility.

    ✅ Strong hierarchy: Headlines are 2.5x larger than body text.

    ❌ Pure vw font sizes: Viewport units alone break browser zoom (WCAG 1.4.4 fail). Use clamp(rem, vw, rem).

    GGoogle FontsBuy on MyFonts

    Color Palette

    10 unique colors
    Light
    #ffffff
    Background· 16.8%
    #09324c
    Accent· 24.5%
    #567e99
    Secondary· 8.3%
    #051f33
    Primary· 7.8%
    #27536d
    Secondary· 7.5%
    #4b6e86
    Secondary· 6.8%
    #256990
    Accent· 6.3%
    #7cc1d9
    Accent· 4.6%

    Business & Marketing Stack

    1 Tools Detected

    Growing

    Behavior Analytics

    1
    Google AnalyticsFree

    User behavior and product analytics

    1

    Categories

    1

    Total Tools

    0

    Enterprise

    0

    Mid-Market

    Assessment: Growing marketing technology adoption

    Sponsored

    Scripts & Styles

    10 Resources

    2
    Scripts
    8
    Styles
    1
    Async
    0
    Defer

    Top Script Sources

    googletagmanager.com(1)local(1)

    Website Identity

    gebco.net

    21 years old
    Location detected: 🇬🇧 United Kingdomvia ip
    NameCheap, Inc.📧 Google Workspaceen

    Social Profiles

    FacebookX (Twitter)

    Sponsored

    Last analyzed: 12 May 2026 at 13:00

    Historical Analysis & Change Tracking