indexo.dev

pimbook.org

.org crawl

First seen 2026-04-18 · Last seen 2026-05-08 · ok HTTP/1.1 200 1123 ms crawled 2026-05-12

US · 185.199.109.153 · AS54113 Fastly, Inc.

Reputation 92/100 no dmarc policy

Classifying

HTML metadata

Title
A Programmer's Introduction to Mathematics
Description
A Programmer's Introduction to Mathematics
Language
en-US
Generator
Hugo 0.49.2

Open Graph

url
http://pimbook.org
title
A Programmer's Introduction to Mathematics
description
A Programmer's Introduction to Mathematics

Technology

CDN
Fastly
Server
GitHub.com
CMS
Hugo
Analytics
  • Google Tag Manager

Third-party hosts loaded (1)

  • www.googletagmanager.com×1

Social

Registration

Registrar
Squarespace Domains II LLC
Created
2018-10-20
Expires
2026-10-20 153 days left
Updated
2025-10-10
Name servers
  • ns-cloud-d4.googledomains.com
  • ns-cloud-d1.googledomains.com
  • ns-cloud-d3.googledomains.com
  • ns-cloud-d2.googledomains.com

DNS records live

NS
  • ns-cloud-d1.googledomains.com
  • ns-cloud-d2.googledomains.com
  • ns-cloud-d3.googledomains.com
  • ns-cloud-d4.googledomains.com
MX
  • 10 mxa.mailgun.org
  • 10 mxb.mailgun.org

Email authentication weak

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

Certificate (current)

R13
from 2026-04-19 to 2026-07-18
Expires in 59 days

Full certificate history on crt.sh ↗

HTTP security headers

Header hygiene 50/100 Checked live page: https://pimbook.org/

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=31556952

Links to (4)

Linked from (1)