indexo.dev

divisbyzero.com

.com crawl

First seen 2026-04-13 · Last seen 2026-05-02 · ok HTTP/1.1 200 168 ms crawled 2026-05-06

US · 192.0.78.25 · AS2635 Automattic, Inc

Reputation 92/100 no dmarc policy

Classifying

HTML metadata

Title
David Richeson: Division by Zero
Description
Professor of Mathematics and the John J. Curley '60 and Ann Conser Curley '63 Faculty Chair in the Liberal Arts at Dickinson College [Icons made by Freepik from www.flaticon.com.]
Language
en
Generator
WordPress.com
Canonical
https://divisbyzero.com/
Feeds

Open Graph

url
https://divisbyzero.com/
title
David Richeson: Division by Zero
locale
en_US
site name
David Richeson: Division by Zero

Technology

Server
nginx
CMS
WordPress
Third-party hosts loaded (13)
  • secure.gravatar.com×5
  • fonts-api.wp.com×2
  • public-api.wordpress.com×2
  • s1.wp.com×2
  • divisbyzero.files.wordpress.com×1
  • divisbyzero.wordpress.com×1
  • gmpg.org×1
  • i0.wp.com×1
  • pixel.wp.com×1
  • s0.wp.com×1
  • s2.wp.com×1
  • stats.wp.com×1
  • wp.me×1

Social

Contact

Address
st to Solve the Mathematical Problems of Antiquity (Princeton University Press, 2019

Registration

Registrar
Wild West Domains, LLC
Created
2009-03-02
Expires
2027-03-02 287 days left
Updated
2026-01-31
Name servers
  • ns1.wordpress.com
  • ns2.wordpress.com

DNS records live

NS
  • ns1.wordpress.com
  • ns2.wordpress.com
  • ns3.wordpress.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

Email authentication partial

SPF
v=spf1 include:aspmx.googlemail.com ~all
softfail (~all)
DMARC
not published
DKIM
no key found at common selectors

Certificate (current)

WR1
from 2026-04-21 to 2026-07-20
Expires in 62 days

Full certificate history on crt.sh ↗

HTTP security headers

Header hygiene 50/100 Checked live page: https://divisbyzero.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=31536000

Links to (7)

Linked from (1)