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costargroup.com

https://costargroup.com· First analyzed 09 May 2026· Updated 09 May 2026
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costargroup.com
Desktop screenshot of costargroup.com
Mobile screenshot of costargroup.com
Mobile

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Hosting Provider

Akamai Technologies, Inc.

IP Address

23.197.130.160

Site Location

🇩🇪 Germanyvia ip

Server Location

🇩🇪 Frankfurt am Main, Germany

ASN

AS16625

Organization

Akamai Technologies, Inc.

Server

Nginx

CDN

Akamai

WAF

Akamai

Nameservers

a9-64.akam.net.a4-66.akam.net.a6-67.akam.net.a1-73.akam.net.+2 more

Performance

93

Core Web Vitals

Weight

First Contentful Paint
1.3 s10%
Speed Index
1.6 s10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
3.4 MB
84 requests
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Infrastructure
Hosting
Akamai Technologies, Inc.
CDN
Akamai

Technology Stack

10 Technologies Detected

Analytics

4
Google Analytics
Google Analytics 4
Facebook PixelLogRocket

Advertising

2
LinkedIn AdsCriteo

CSS Frameworks

1
Tailwind CSS

Icon Libraries

1
Font Awesome

Tag Managers

1
Google Tag Manager

Web Servers

1
Nginx

SEO Analysis

C66/100
18
7
1
Meta Tags8/15
Content10/12
Headings8/8
Technical20/21
E-E-A-T2/7
Images1/7
Links5/5
URL5/5
Social1/5
Freshness0/4
Mobile3/4
Indexability3/3
C
costargroup.comcostargroup.com

Home | CoStar Group

Discover the top commercial real estate brands offering innovative solutions, industry insights, and market leadership

Title Length19 chars

Recommended: 50-60 chars (~121px / 580px)

Description Length118 chars

Recommended: 120-160 chars

Issues (1)

  • • Most images missing alt text (38/39) — critical for accessibility and SEO

8 issues found

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Local SEO

Local Search Readiness

26/100
Needs Work
7 11

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AI & LLM Readiness

D53/100
Bot Access
20/25
Machine Read.
13/25
Schema Data
6/25
Citation
14/25

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
nav
Text ratio:3%
Words:1,005
Token eff.:Optimal
Sections/1K:9
Depth:1/5

Structured Data

2 JSON-LD
Person×1.3Organization×1.1
sameAs entity links

Citation Readiness

Opening Summary58w
Descriptive Headingsavg 5.1w
Canonical URL
Open Graph1/3
Twitter Card0/3
Language Tag
Publish Date
Author Info
Lists
Tables
TL;DR / Summary
About Page Link
Recommendations (6)
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.
C
69/100
13
Passed
2
Critical
2
Warnings
Images & Alt Text
5/20
Checks if images have descriptive alt text for screen readers and visually impaired users.
Semantic Structure
18/20
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
14/15
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
4/15
Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.
2 recommendations
  • •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.
32/100
E
349 mg
CO₂e / view
3.4 MB
Page Weight
15%
Cleaner Than
New Visitor
399 mg
vs
Returning (cached)
200 mg
Annual (10K/mo)
41.9 kg
Emission Segments
Data Center
17 mg
Network
103 mg
Device
229 mg
Resource Breakdown
JavaScript
269.7 KB
Images
411.9 KB
CSS
2.7 MB
HTML
21.8 KB
Other
300 B
Green Hosting Verified
Akamai Technologies, Inc.
Provider Match
5 recommendations
  • •Carbon footprint recommendation preview...
Upgrade to view recommendations
A

Security Score

81%Very Good
Interactive

HTTPS

WAF

181d

Certificate Details

Type

Extended Validation (EV)

Certificate Authority

DigiCert Inc

Key Algorithm

RSA (2048 bit)

Signature

SHA-256 with RSA

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2

Valid From

22.04.2026

Valid Until

06.11.2026

OCSP Stapling

Enabled

Subject Alternative Names (20)

gateway.costar.comads.csgpmarketplace.comahprd1cdn.csgpimgs.comahprd2cdn.csgpimgs.comahprd3cdn.csgpimgs.comahprd4cdn.csgpimgs.comahprdcdn1.costar.comahprdcdn1.csgpimgs.com+12 more

SHA-256 Fingerprint

A5:EE:EE:51:07:DC:9E:E3:F1:18:90:C4:26:DE:3F:A3:2C:BF:E2:D6...

Upgrade to view header details

HTTP Headers

Developer Console

accept-ranges
bytes
cache-control
🔴 No Cache(must-revalidate, no-cache, private)
content-encoding
📦 Gzip(gzip)
content-language
en
content-length
22073
content-security-policy
report-uri /report-csp-violation
Good Warning Issue

Email Infrastructure

Microsoft 365

Score

95

SPF
DKIM
DMARC

DMARC Policy

Reject (Strictest)

MX Records (1)

costar-com.mail.protection.outlook.com

Domain Information

costargroup.com

Domain Age
27y 1m

Created

22.03.1999

Expires

22.03.2027

Last Updated

18.02.2026

Registrar

MarkMonitor Inc.

DNSSEC
Not Enabled

Privacy & Compliance

CookieLaw

Cookie Consent Banner
CookieLaw
Privacy Policy
Terms of Service

GDPR Indicators

Cookie consent banner detected
CMP: CookieLaw
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
70/100
Mobile Friendly28 breakpoints
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=1.0
2 recommendations
  • •Mobile compatibility recommendation preview...
Upgrade to view recommendations

Typography & Readability

CostarBrownBold + CostarBrown

WCAG Partial
52/100
Readability
/30
17/30

18px · LH 1.78

Hierarchy
/20
15/20

1.56x ratio · ✓ H1→H6

WCAG
/25
11/25

1:1 min contrast

Performance
/25
9/25

3 fonts · 5 req

Heading Font

CostarBrownBold

Sans28px

Body Font

CostarBrown

Sans18px

Contrast Ratio

1:1

8 issues

Reading Comfort

~34 CPL

Narrow lines
28px
h1
50px
h2
24px
h3
22px
h4
18px
p
Minor Second
Scale

✅ Excellent readability: 18px body text is ideal for all devices.

❌ Very complex text: Flesch score 10/100. Consider shorter sentences and simpler words.

⚠️ Partial contrast: 8 elements below WCAG AA threshold (min 1.0:1).

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

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

⚠️ Missing font-display: swap — users may see invisible text while fonts load (FOIT).

Buy on MyFontsFlesch 10

Color Palette

11 unique colors
13.97:1 AAA Light
#ffffff
Background· 26.200000000000003%
#2c2c2c
Other· 6.8%
#dff4f4
Primary· 13.3%
#ebe7dd
Secondary· 11.3%
#4c382f
Secondary· 6.2%
#0c0e10
Secondary· 6.1%
#d4bda6
Secondary· 5.8%
#946d54
Secondary· 5.6%

Business & Marketing Stack

8 Tools Detected

Enterprise

Behavior Analytics

3
Google Tag ManagerFree
Google AnalyticsFree
LogRocketMid-Market

User behavior and product analytics

Advertising

3
Facebook PixelMid-Market
LinkedIn AdsEnterprise
CriteoEnterprise

Ad platforms and retargeting pixels

Privacy & Cookies

1
OneTrustEnterprise

Cookie consent and privacy compliance tools

Social Media

1
Facebook SDKFree

Social widgets and sharing tools

4

Categories

8

Total Tools

3

Enterprise

2

Mid-Market

Assessment: Sophisticated marketing and sales technology infrastructure

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Scripts & Styles

23 Resources

20
Scripts
3
Styles
11
Async
2
Defer

Top Script Sources

googletagmanager.com(4)local(4)snap.licdn.com(3)connect.facebook.net(2)cdn.cookielaw.org(2)

Website Identity

CoStar Group

CoStar Group

Organization

CoStar Group is a leading global provider of commercial and residential real estate information, analytics, and online marketplaces, and is on a mission to digitize the world's real estate.

8882267404
www.costargroup.com/
27 years old
Location detected: 🇩🇪 Germanyvia ip
MarkMonitor Inc.📧 Microsoft 365en

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Last analyzed: 09 May 2026 at 07:11

Historical Analysis & Change Tracking