indexo.dev

ciolek.dev

.dev crawl

First seen 2026-04-11 · Last seen 2026-04-11 · ok HTTP/1.1 200 298 ms crawled 2026-05-18

US · 104.21.39.120 · AS13335 Cloudflare, Inc.

Reputation 87/100 weak security headers no dmarc policy

Classifying

HTML metadata

Title
Jakub Ciolek - cloud security, system engineering and compilers
Description
Cloud security, Go internals, and systems engineering: bugs, edge cases, and things that weren’t supposed to happen.
Language
en

Technology

CDN
Cloudflare

Social

DNS records live

NS
  • asa.ns.cloudflare.com
  • langston.ns.cloudflare.com
MX
  • 1 aspmx.l.google.com
  • 10 aspmx2.googlemail.com
  • 10 aspmx3.googlemail.com
  • 5 alt1.aspmx.l.google.com
  • 5 alt2.aspmx.l.google.com
Verified for
  • Google

Email authentication weak

SPF
not published
DMARC
not published
DKIM
no key found at common selectors

Certificate (current)

WE1
from 2026-05-17 to 2026-08-15
Expires in 87 days

Full certificate history on crt.sh ↗

HTTP security headers

Header hygiene 30/100 Checked live page: https://ciolek.dev/

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

Links to (4)

Linked from (1)