jmduke.com

.com crawl

First seen 2026-04-11 · Last seen 2026-05-19 · ok HTTP/1.1 200 1914 ms crawled 2026-05-19

US · 216.198.79.1 · AS16509 Amazon.com, Inc.

Reputation 92/100 no dmarc policy

Classifying

HTML metadata

Title

Applied Cartography | Justin Duke

Description

Essays and media reviews by Justin Duke, CEO of Buttondown and partner at Third South Capital.

Language

Canonical

https://jmduke.com/

Feeds

RSS Feed RSS
Essays Feed RSS

Open Graph

url: https://jmduke.com/
title: Applied Cartography | Justin Duke
site name: Applied Cartography
description: Essays and media reviews by Justin Duke, CEO of Buttondown and partner at Third South Capital.

Technology

CDN: Vercel

Third-party hosts loaded (1)

cdn.seline.com×1

Social

Registration

Registrar

Cloudflare, Inc.

Created

2013-09-30

Expires

2027-09-30 498 days left

Updated

2026-02-06

Name servers

joan.ns.cloudflare.com
moura.ns.cloudflare.com

DNS records live

NS

joan.ns.cloudflare.com
moura.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

TXT

google-site-verification=w-m8XjqWVepfrKLtHgnfPJeaL8B9IZAGeLKbvjPsCxU

Email authentication weak

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

Certificate (current)

R13

from 2026-04-20 to 2026-07-19

Expires in 60 days

Full certificate history on crt.sh ↗

HTTP security headers

Header hygiene 50/100 Checked live page: https://www.jmduke.com/

present

strict-transport-security

findings

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

Header values

strict-transport-security: max-age=63072000