flexbooks.ck12.org

Informations principales

ℹ️

Titre: K-12 FlexBooks | CK-12 Foundation

Description: CK-12’s free, standards-aligned, digital textbooks are customizable, integrated, and interactive, allowing users to create 200,000+ localized FlexBooks.

Mots-clés: empty

Encodage des pages: utf-8

Taille du fichier de page: 296 KB

Informations sur le serveur

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IP: 3.164.68.58

Emplacement: United States,US,,,37.751,-97.822,America/Chicago

Serveur HTTP: apache/2.4.58 (ubuntu)

Codage: utf-8

Liste des balises méta

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property: og:site_name itemprop: name name: author content: CK-12 Foundation
property: fb:app_id content: 159884644067996
itemprop: url content: https://www.ck12.org
itemprop: telephone content: (650) 494-1302
charset: utf-8
name: viewport content: width=device-width, initial-scale=1, minimum-scale=1.0
name: google-site-verification content: wHx0f-Udlfd7ZNYNrIXpJVpjjO8nSH5RE0jIX8V-jIM
name: google-translate-customization content:
name: application-name content: CK-12 Foundation
name: msapplication-TileColor content: #003300
name: msapplication-TileImage content: //static.ck12.org/assets/favicon/web-app-manifest-192x192.png
property: og:description name: description content: CK-12’s free, standards-aligned, digital textbooks are customizable, integrated, and interactive, allowing users to create 200,000+ localized FlexBooks. helmet: true
property: og:url content: https://flexbooks.ck12.org/flexbooks/student/
itemprop: provider content: CK-12 Foundation
itemprop: name
itemprop: description
itemprop: url content: https://flexbooks.ck12.org/flexbooks/student/

Liens internes

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Liens externes

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Informations Whois

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domain_name: ck12.org

update_date: 2025-08-07T22:10:54.892Z

update_time: 1754604654

creation_date: 2006-12-16T08:37:03.681Z

creation_time: 1166258223

expiration_date: 2028-12-16T08:37:03.681Z

Données brutes Whois

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            Domain Name: CK12.ORG
Registrar: Amazon Registrar, Inc.
Domain Status: client delete prohibited
Domain Status: client transfer prohibited
Domain Status: client update prohibited
Registry Expiry Date: 2028-12-16T08:37:03.681Z
Creation Date: 2006-12-16T08:37:03.681Z
Updated Date: 2025-08-07T22:10:54.892Z
Name Server: NS-1136.AWSDNS-14.ORG
Name Server: NS-161.AWSDNS-20.COM
Name Server: NS-1687.AWSDNS-18.CO.UK
Name Server: NS-977.AWSDNS-58.NET
REGISTRAR Contact: Amazon Registrar, Inc.
>>> Last update of RDAP database: 2026-02-16T21:03:58Z

Audit SEO

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Référencement technique

✓

Code de réponse

200

Statut 200 OK - la page se charge correctement.

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Codage des caractères

Page: utf-8, Header: utf-8

Codage des caractères cohérent entre le HTML et les en-têtes.

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Taille des pages

303246 bytes

Taille de page acceptable pour un chargement rapide.

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Ressources

109 total

Trop de ressources. Optimisez et combinez les fichiers pour de meilleures performances.

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Hreflang balises

0 hreflang tags

Ajoutez des balises hreflang si vous avez du contenu multilingue.

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Robots.txt

Missing

Ajoutez le fichier robots.txt pour contrôler l’exploration des moteurs de recherche.

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Sitemap

Not found

Ajoutez sitemap.xml et référencez-le dans robots.txt.

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HTTPS

Yes

Connexion HTTPS sécurisée activée.

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Compression

gzip

Compression Gzip ou Zstd activée pour un chargement plus rapide.

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Mise en cache

Not set

Ajoutez des en-têtes de contrôle de cache pour améliorer la vitesse de chargement des visiteurs qui reviennent.

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Vitesse des pages

2.64 ms

Excellente vitesse de chargement.

Référencement sur la page

✓

Titre

K-12 FlexBooks | CK-12 Foundation

Bonne longueur de titre (30 à 60 caractères).

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Méta-description

CK-12’s free, standards-aligned, digital textbooks are customizable, integrated, and interactive, allowing users to create 200,000+ localized FlexBooks. Lenght:152

Bonne longueur de méta description (100-160 caractères).

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Titre H1

2 found - "Interact with Your Math & Science Textbooks in a Whole New Way"

Utilisez un seul titre H1 par page. Supprimez les balises H1 supplémentaires.

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Nombre de mots

202

Contenu très court. Visez au moins 500 mots pour un meilleur référencement.

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Balise canonique

Ajoutez une balise canonique pour éviter les problèmes de contenu en double.

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Méta en double

[]

Aucune balise méta en double trouvée.

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Mots-clés

empty

Ensemble de méta-mots-clés (remarque : non utilisé par les principaux moteurs de recherche).

Contenu et UX

✓

Langue

en

Attribut de langue correctement défini.

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Images

67 total, 51 missing ALT

Ajoutez du texte ALT aux images pour l'accessibilité et le référencement.

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Fenêtre

width=device-width, initial-scale=1, minimum-scale=1.0

Balise méta Viewport correctement définie pour les appareils mobiles.

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Ouvrir le graphique

Missing: og:title, og:image

Ajoutez les balises OpenGraph manquantes pour le partage sur les réseaux sociaux :og:title, og:image

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Données structurées

1 JSON-LD scripts

Données structurées (JSON-LD) trouvées.

Expressions de recherche - Google

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Position	Phrase	Page	Fragment
3	k e q	/cbook/ck-12-chemist...	Equilibrium Constant (Keq) The equilibrium constant (Keq ) is the ratio of the mathematical product of the concentrations of the products of a reaction to the mathematical product of the ...
7	write 6 6 3 4	/cbook/ck-12-cbse-ma...	Divisibility Rules for 2, 3, 4, 5, 6, 8, 9, 10 and 11 A number is divisible 6 if it is divisible by both 2 and 3 . Example of divisibility rule for 6 : Consider the number 47394. Since its units digit is 4 , it is ...
9	types of energy	/cbook/cbse-physics-...	Forms of Energy - Defintion, Types, Formula, Examples ... The six forms of energy include mechanical, chemical, electrical, light, thermal, and sound energy . Another form of energy is nuclear energy.
12	science models	/cbook/ck-12-middle-...	Scientific Models Models allow scientists to work with systems that are nearly impossible to study as a whole. Models help scientists to understand these systems.
14	write the time using words	/cbook/ck-12-first-g...	Time Conversion between Words and Numbers We are going to learn how to write down the time in digits (numbers). ... The most common way to express time in words is just to say the time in the form HOUR ...
22	us class us	/user:coachtgj/cbook...	The American Class System Most sociologists use six class divisions when describing the American class system. Because it is an open system, people are able to move between classes.
22	date mark time 40 minutes	/cbook/ck-12-middle-...	Elapsed Time Elapsed time is the amount of time that has passed between two events. You can calculate the elapsed time by figuring out the difference between the start and ...
26	complete a square	/cbook/ck-12-algebra...	Completing the Square When the Leading Coefficient ... Step 1: Write the polynomial so that and are on the left side of the equation and the constants on the right. Step 2: Pull out from everything on the left side.

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