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Domain report

oclass.app

oclass.app ranks in the top 0.080% of domains by connectivity (Common Crawl, cc-main-2026-jul-aug-sep), with 4 distinct hosts observed under it.

Explore oclass.app in the Web Graph

Connectivity

#107,199harmonic-centrality rank
Top percentile
0.080%
Hosts observed
4

From the Common Crawl cc-main-2026-jul-aug-sep hyperlink graph, 133,241,980 domains total. What this rank means

HTTPS reachability

200HTTP status

https://oclass.app/ answered with HTTP 200.

Certificate until 2026-12-07C=US, O=Let's Encrypt, CN=YE2

DNS records

A
  • 104.21.4.121
  • 172.67.132.14
AAAA
  • 2606:4700:3036::6815:479
  • 2606:4700:3036::ac43:840e
MX
  • 5 mx1.hostinger.com.
  • 10 mx2.hostinger.com.
NS
  • bob.ns.cloudflare.com.
  • katelyn.ns.cloudflare.com.
AS
Server in network CLOUDFLARENET, AS13335 · United States104.21.4.0/24, which holds 104.21.4.121

Live preview

Screenshot of oclass.app

This site sends "X-Frame-Options: SAMEORIGIN", which blocks embedding it here.

Since oclass.app can't be embedded live, this is a captured screenshot instead — a snapshot from whenever it was last rendered, not necessarily this exact moment.

Domain registration (WHOIS / RDAP)

Registrar
Namecheap Inc.
Registered
2020-02-27
Expires
2027-02-27
Last changed
2026-02-02

Nameservers: bob.ns.cloudflare.com, katelyn.ns.cloudflare.com

Status: active

How to read WHOIS and RDAP data

SSL certificate

Common name
oclass.app
Issuer
C=US, O=Let's Encrypt, CN=YE2
Valid from
2026-09-08
Valid until
2026-12-07

Matches oclass.app exactly. Source: Certificate Transparency logs (crt.sh).

How to check when a certificate expires

HTTP & security headers

Response

Server
cloudflare
Content-Type
text/html; charset=UTF-8
Cache-Control
Not sent
Content-Encoding
Not sent

Security

Content-Security-Policy
upgrade-insecure-requests
Strict-Transport-Security
max-age=15552000; includeSubDomains; preload
X-Frame-Options
SAMEORIGIN
X-Content-Type-Options
nosniff
Referrer-Policy
Not sent
Permissions-Policy
Not sent

What each security header does

Redirect chain

  1. 1.http://oclass.app/HTTP 301

    → https://oclass.app/

  2. 2.https://oclass.app/HTTP 200

Meta tags

Title
School Management System | Management Software Singapore - O ClassSchool Management System Singapore- OClass
Description
OClass is an all-in-one class management software system, School Management System Singapore so that you can focus on teaching.
Canonical
https://oclass.app/
Robots
follow, index, max-snippet:-1, max-video-preview:-1, max-image-preview:large
Generator
WordPress 5.9.19
Open Graph title
School Management System | Management Software Singapore | O Class
Open Graph description
OClass is an all-in-one class management software system, School Management System Singapore so that you can focus on teaching.
Open Graph image
Not set
Open Graph type
website
Twitter card
summary_large_image
Twitter title
School Management System | Management Software Singapore | O Class
Twitter image
Not set

robots.txt

Disallow rules (User-agent: *)
2
Disallow rules (other agents)
0

No Sitemap declared in robots.txt.

Technology detected

Best-effort, based on a small set of well-known signals — this may be incomplete.

  • Cloudflarecdn

    Server: cloudflare

  • PHPother

    X-Powered-By: PHP/7.4.33

  • WordPresscms

    <meta name="generator"> = "WordPress 5.9.19"

  • Google Analyticsanalytics

    Found "googletagmanager.com/gtag/js" in the page's HTML

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