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a1.rs

https://a1.rs· First analyzed 29 May 2026· Updated 29 May 2026
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a1.rs
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Mobile

Sponsored

Hosting Provider

VSR mobile

IP Address

77.243.16.127

Site Location

🇷🇸 Serbiavia tld

Server Location

🇷🇸 Belgrade, Serbia

ASN

AS44143

Nameservers

ns2.mtel.net.ns.mtel.net.

Performance

75

Core Web Vitals

Weight

First Contentful Paint
3.3 s10%
Speed Index
4.3 s10%
Largest Contentful Paint
—25%
Total Blocking Time
0.0 ms30%
Cumulative Layout Shift
0.00025%
3 MB
183 requests

Image Optimization

WebP
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Infrastructure
Hosting
VSR mobile

Technology Stack

12 Technologies Detected

Analytics

4
Google Analytics
Google Analytics 4
Facebook PixelMicrosoft Clarity

Advertising

3
Google AdsTikTok PixelSnapchat Pixel

Libraries

1
jQuery

UI Components

1
Swiper

CSS Frameworks

1
Tailwind CSS

Tag Managers

1
Google Tag Manager

Customer Support

1
Zendesk

SEO Analysis

B78/100
22
5
0
Meta Tags15/15
Content7/12
Headings8/8
Technical23/25
E-E-A-T2/7
Images5/7
Links5/5
URL5/5
Social4/5
Freshness0/4
Mobile1/4
Indexability3/3
A
a1.rsa1.rs

A1 Srbija - Mobilni telefoni, tarifni paketi, internet | A1

Pridruži se A1 mreži koja najbrže raste i uživaj u najboljem korisničkom iskustvu. Izaberi postpaid ili prepaid. Poruči novi telefon i dodatnu opremu.

Title Length59 chars

Recommended: 50-60 chars (~335px / 580px)

Description Length150 chars

Recommended: 120-160 chars

Issues (0)

    5 issues found

    Upgrade to view details

    Crawlability

    Sitemap

    Type: standard

    925 URLs

    robots.txt

    36 rules

    Sitemap reference found

    Allows all crawlers

    Local SEO

    Local Search Readiness

    20/100
    Needs Work
    5 13

    Sponsored

    AI & LLM Readiness

    D40/100
    Bot Access
    20/25
    Machine Read.
    7/25
    Schema Data
    3/25
    Citation
    10/25

    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
    Text ratio:2%
    Words:1,193
    Token eff.:Optimal

    Structured Data

    1 JSON-LD
    Organization×1.1
    sameAs entity links

    Citation Readiness

    Opening Summary19w
    Descriptive Headings
    Canonical URL
    Open Graph2/3
    Twitter Card3/3
    Language Tag
    Publish Date
    Author Info
    Lists
    Tables
    TL;DR / Summary
    About Page Link
    Recommendations (11)
    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
    63/100
    10
    Passed
    5
    Critical
    4
    Warnings
    Images & Alt Text
    15/20
    Checks if images have descriptive alt text for screen readers and visually impaired users.
    Semantic Structure
    9/20
    Evaluates proper use of HTML5 semantic elements (header, nav, main, footer) and heading hierarchy.
    Forms & Inputs
    8/15
    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
    11/15
    Ensures all interactive elements are reachable and operable via keyboard (tab, enter, escape).
    ARIA & Roles
    5/15
    Checks correct use of WAI-ARIA attributes (roles, states, properties) for assistive technologies.
    5 recommendations
    • •Accessibility recommendation preview...
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    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.
    11/100
    F
    382 mg
    CO₂e / view
    3.0 MB
    Page Weight
    30%
    Cleaner Than
    New Visitor
    437 mg
    vs
    Returning (cached)
    218 mg
    Annual (10K/mo)
    45.9 kg
    Emission Segments
    Data Center
    85 mg
    Network
    92 mg
    Device
    205 mg
    Resource Breakdown
    JavaScript
    194.0 KB
    Images
    342 B
    CSS
    253.5 KB
    HTML
    398.5 KB
    Other
    2.2 MB
    Green Hosting Not Verified
    VSR mobile
    7 recommendations
    • •Carbon footprint recommendation preview...
    Upgrade to view recommendations
    D

    Security Score

    40%Poor
    Critical / Transactional

    HTTPS

    No WAF

    290d

    Certificate Details

    Type

    Organization Validated (OV)

    Certificate Authority

    DigiCert Inc

    Key Algorithm

    RSA (2048 bit)

    Signature

    SHA-256 with RSA

    TLS Version

    TLSv1.2

    HTTP Protocol

    HTTP/1.1

    Valid From

    12.02.2026

    Valid Until

    15.03.2027

    OCSP Stapling

    Enabled

    Subject Alternative Names (2)

    *.a1.rsa1.rs

    SHA-256 Fingerprint

    E5:FF:A2:76:D7:C7:54:9B:E0:6E:D6:06:E2:1F:5E:44:64:C3:61:38...

    Top Recommendations

    Security recommendation preview

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    Upgrade to view header details

    HTTP Headers

    Developer Console

    access-control-allow-credentials
    true
    access-control-allow-headers
    x-asmp-json,Content-Type
    access-control-allow-origin
    asmp.a1.rs
    access-control-expose-headers
    *
    cache-control
    🔴 No Cache(no-store, no-cache, must-revalidate)
    connection
    Close
    Good Warning Issue

    Email Infrastructure

    Microsoft 365

    Score

    98

    SPF
    DKIM
    DMARC

    DMARC Policy

    Quarantine (Moderate)

    MX Records (1)

    a1-rs.mail.protection.outlook.com

    Domain Information

    a1.rs

    DNSSEC
    Not Enabled

    Privacy & Compliance

    CookieLaw

    Cookie Consent Banner
    CookieLaw
    Privacy Policy
    Terms of Service

    GDPR Indicators

    Cookie consent banner detected
    CMP: CookieLaw

    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.
    C
    63/100
    Mobile Friendly55 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, maximum-scale=1.0, minimum-scale=1.0, user-scalable=no
    3 recommendations
    • •Mobile compatibility recommendation preview...
    Upgrade to view recommendations

    Typography & Readability

    A1Serif-Bold + A1Sans-Regular

    WCAG Partial
    60/100
    Readability
    /30
    22/30

    16px · LH 1.50

    Hierarchy
    /20
    17/20

    4x ratio · ✓ H1→H6

    WCAG
    /25
    14/25

    1.12:1 min contrast

    Performance
    /25
    7/25

    4 fonts · 5 req

    Heading Font

    A1Serif-Bold

    Serif64px

    Body Font

    A1Sans-Regular

    Sans16px

    Contrast Ratio

    1.12:1

    13 issues

    Reading Comfort

    ~39 CPL

    Narrow lines
    64px
    h1
    20px
    h2
    48px
    h3
    20px
    h4
    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: 13 elements below WCAG AA threshold (min 1.1:1).

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

    ✅ Strong hierarchy: Headlines are 4.0x larger than body text.

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

    Buy on MyFonts

    Color Palette

    11 unique colors
    21:1 AAA Dark
    #000000
    Background· 25.599999999999998%
    #ffffff
    Background· 17.700000000000003%
    #370102
    Accent· 9.2%
    #d5dfe7
    Primary· 6%
    #98201f
    Accent· 4.4%
    #a67e74
    Secondary· 4.3%
    #4b1c20
    Secondary· 3.3%

    Business & Marketing Stack

    8 Tools Detected

    Enterprise

    Behavior Analytics

    3
    Google Tag ManagerFree
    Google AnalyticsFree
    Microsoft ClarityFree

    User behavior and product analytics

    Advertising

    3
    Facebook PixelMid-Market
    TikTok PixelMid-Market
    Snapchat PixelMid-Market

    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

    1

    Enterprise

    3

    Mid-Market

    Assessment: Sophisticated marketing and sales technology infrastructure

    Sponsored

    Scripts & Styles

    27 Resources

    20
    Scripts
    7
    Styles
    18
    Async
    0
    Defer

    Top Script Sources

    googletagmanager.com(5)analytics.tiktok.com(3)connect.facebook.net(2)tr.snapchat.com(1)capi-automation.s3.us-east-2.amazonaws.com(1)

    Website Identity

    A1 Srbija

    A1 Srbija

    Organization
    0601234
    a1.rs/privatni
    Location detected: 🇷🇸 Serbiavia tld
    📧 Microsoft 365sr_latin

    Sponsored

    Last analyzed: 29 May 2026 at 20:50

    Historical Analysis & Change Tracking

    a1.rs Technology Stack - Built With jQuery, Swiper, Tailwind CSS, Google Analytics, Google Analytics 4 | StackOptic | StackOptic