indexo.dev

hefferon.net

.net crawl

First seen 2026-04-14 · Last seen 2026-05-06 · ok HTTP/1.1 200 942 ms crawled 2026-05-08

US · 192.254.225.166 · AS31898 Oracle Corporation

Reputation 92/100 no dmarc policy

Classifying

HTML metadata

Title
Free Texts and More
Language
en
Generator
thesitewizard.com's Layout Wizard 3.0.0
Canonical
https://hefferon.net/

Open Graph

url
https://hefferon.net/
title
Free Math Texts and more, from Jim Hefferon
locale
en_US
site name
Free math texts
description
Free Texts in Mathematics and Computer Science and more, from Jim Hefferon

Technology

Server
Apache
Analytics
  • Google Tag Manager
Fonts
  • Google Fonts

Third-party hosts loaded (2)

  • fonts.googleapis.com×1
  • www.googletagmanager.com×1

Registration

Registrar
Launchpad.com Inc.
Created
2020-05-08
Expires
2027-05-08 353 days left
Updated
2026-03-25
Name servers
  • ns6237.hostgator.com
  • ns6238.hostgator.com

DNS records live

NS
  • ns6237.hostgator.com
  • ns6238.hostgator.com
MX
  • 0 mail.hefferon.net

Email authentication weak

SPF
v=spf1 a mx include:websitewelcome.com ~all
softfail (~all)
DMARC
not published
DKIM
  • default: v=DKIM1; k=rsa; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAxAEyeIOj6P2mO1P6QZRfXeaOlk9JrCw9iQoO3B7PE/KmCzVn9fM1jp2erpEmoTMfdW8oydSgaEKI0r…
selectors probed

Certificate (current)

R12
from 2026-03-26 to 2026-06-24
Expires in 35 days

Full certificate history on crt.sh ↗

HTTP security headers

Header hygiene 50/100 Checked live page: https://hefferon.net/

present
  • content-security-policy
findings
  • missing HSTS
  • missing frame protection
  • missing content type protection
  • missing Referrer Policy
  • missing Permissions Policy
Header values
content-security-policy
upgrade-insecure-requests

Links to (1)

Linked from (1)