indexo.dev

cs161.org

.org crawl

First seen 2026-04-20 · Last seen 2026-05-10 · ok HTTP/1.1 200 627 ms crawled 2026-05-13

US · 185.199.109.153 · AS54113 Fastly, Inc.

Reputation 95/100 weak security headers

Classifying

HTML metadata

Title
Redirecting to https://sp26.cs161.org
Canonical
https://sp26.cs161.org/

Technology

CDN
Fastly
Server
GitHub.com

Registration

Registrar
Tucows Domains Inc.
Created
2019-02-07
Expires
2034-02-07 2821 days left
Updated
2025-02-01
Name servers
  • ns-cloud-e1.googledomains.com
  • ns-cloud-e3.googledomains.com
  • ns-cloud-e2.googledomains.com
  • ns-cloud-e4.googledomains.com

DNS records live

NS
  • ns-cloud-e1.googledomains.com
  • ns-cloud-e2.googledomains.com
  • ns-cloud-e3.googledomains.com
  • ns-cloud-e4.googledomains.com

Email authentication no MX

SPF
v=spf1 include:_spf.mail.cs161.org -all
strict (-all)
DMARC
v=DMARC1; p=reject
policy: reject (enforced)
DKIM
no key found at common selectors

Certificate (current)

R13
from 2026-05-07 to 2026-08-05
Expires in 78 days

Full certificate history on crt.sh ↗

HTTP security headers

Header hygiene 30/100 Checked live page: https://cs161.org/

findings
  • missing HSTS
  • missing Content Security Policy
  • missing frame protection
  • missing content type protection
  • missing Referrer Policy
  • missing Permissions Policy

Linked from (1)