indexo.dev

zearn.org

.org toplist crawl

First seen 2026-04-11 · Last seen 2026-05-18 · ok HTTP/1.1 200 2335 ms crawled 2026-05-18

US · 3.33.241.96 · AS16509 Amazon.com, Inc.

Reputation 94/100 dmarc monitor-only

Classifying

HTML metadata

Title
Login | Zearn Math
Description
Learning with Zearn helps math make sense. Students explore math through pictures, visual models, and real-life examples. Log in to your Zearn account.
Language
en-US

Open Graph

url
https://www.zearn.org/
title
Zearn Math | Top-rated Math Learning Platform
description
Learning with Zearn helps math make sense. Students explore math through pictures, visual models, and real-life examples. Log in to your Zearn account.

Technology

Server
Heroku

Third-party hosts loaded (1)

  • d33atdio81inpg.cloudfront.net×67

Registration

Registrar
Tucows Domains Inc.
Created
2011-07-30
Expires
2026-07-30 71 days left
Updated
2025-08-03
Name servers
  • ns1.dnsimple.com
  • ns2.dnsimple.com
  • ns3.dnsimple.com
  • ns4.dnsimple.com

DNS records live

NS
  • ns1.dnsimple.com
  • ns2.dnsimple.com
  • ns3.dnsimple.com
  • ns4.dnsimple.com
MX
  • 0 zearn-org.mail.protection.outlook.com
TXT
Show 9 TXT records
  • google-site-verification=Tf4c2Md8r6yDih2uzYfxnJeWezyazZahvsu0F-rdqpk
  • google-site-verification=tokMBoMsihuVlB4yvEVFPLD5TTcS4gSY1WMQeJuflwY
  • openai-domain-verification=dv-WRsgAQSc3kHAQRopqBFSfKRg
  • status-page-domain-verification=1h3ksr9v22td
  • jamf-site-verification=6120mEV62EqN3qx_SzzF1g
  • ALIAS for zearn.org.herokudns.com
  • IDFZLB60YOK3PQ6OADVUTN2A6VXGEH3WL0B37QCL
  • MS=ms41418645
  • anthropic-domain-verification-x0g1n5=GwyU5u9OPkcJXbotrRG8LDutn

Email authentication partial

SPF
v=spf1 include:spf.protection.outlook.com include:amazonses.com include:spf.mandrillapp.com include:mail.zendesk.com include:servers.mcsv.net include:stspg-customer.com include:mktomail.com -all
strict (-all)
DMARC
v=DMARC1; p=none; rua=mailto:5358b84f8c8e.a@dmarcinput.com; ruf=mailto:5358b84f8c8e.f@dmarcinput.com; fo=1
policy: none (monitoring only)
DKIM
Show 4 DKIM selectors
  • selector1: v=DKIM1; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQC66aBZiEjbVnh1So0RAvydo8+F42dgRSAUokQXCI0nEJsmthB/75rwHGdVG4uOsoEarm4I43bS8ikfZztSjz…
  • k1: k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDbNrX2cY/GUKIFx2G/1I00ftdAj713WP9AQ1xir85i89sA2guU0ta4UX1Xzm06XIU6iBP41VwmPwBGRNofhBVR+e6WHUo…
  • s1: k=rsa; t=s; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAoMGDKFIDXCiosft5LIf+DclBGDnk1fJkCDIiJRoM/e/aNngQ5ARWxya9jyNq/siWlErbrjtBgngG29W+ja…
  • s2: k=rsa; t=s; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCi2HJs1+oy7jodid9q+pA2i6JETEmJW2vPKwLihOGgFELkuJxFfYfSjRB6VSvwHbzekm8VWtwfLjinTJ0058s10W…
selectors probed

Certificate (current)

Sectigo Public Server Authentication CA DV R36
from 2025-12-18 to 2026-11-10
Expires in 174 days

Full certificate history on crt.sh ↗

HTTP security headers

Header hygiene 90/100 Checked live page: https://www.zearn.org/

present
  • strict-transport-security
  • content-security-policy
  • x-frame-options
  • x-content-type-options
  • referrer-policy
findings
  • CSP allows unsafe inline scripts/styles
  • missing Permissions Policy
Header values
referrer-policy
strict-origin-when-cross-origin
x-frame-options
SAMEORIGIN
x-content-type-options
nosniff
content-security-policy
default-src 'self' https:; script-src 'self' https: 'unsafe-inline' 'unsafe-eval' blob:; style-src 'self' https: 'unsafe-inline'; img-src 'self' https: data: blob:; font-src 'self' https: data: moz-extension: chrome-extension: safari-web-extension:; connect-src 'self' https: data: blob: ws: wss:; media-src 'self' https: data: blob:; frame-src 'self' https:; object-src 'self' https:; worker-src 'self' https: blob:; report-uri /csp_report_log
strict-transport-security
max-age=63072000; includeSubDomains

Linked from (1)