periodic-table.co

.co crawl

First seen 2026-04-13 · Last seen 2026-05-08 · ok HTTP/1.1 200 1600 ms crawled 2026-05-07

US · 103.224.182.216 · AS133618 Trellian Pty. Limited

Reputation 87/100 weak security headers no dmarc policy

Classifying

HTML metadata

Title: periodic-table.co

Technology

Server: Apache

DNS records live

NS

ns15.abovedomains.com
ns16.abovedomains.com

MX

10 park-mx.above.com

Email authentication partial

SPF: v=spf1 ip6:fdcf:abda:4154::/48 -all
strict (-all)
DMARC: not published
DKIM: no key found at common selectors

Certificate (current)

R13

from 2026-04-01 to 2026-06-30

Expires in 42 days

Full certificate history on crt.sh ↗

HTTP security headers

Header hygiene 30/100 Checked live page: https://periodic-table.co/

findings

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

Linked from (3)