sagemath.org

.org crawl

First seen 2026-04-11 · Last seen 2026-05-19 · ok HTTP/1.1 200 3490 ms crawled 2026-05-18

US · 104.26.11.200 · AS13335 Cloudflare, Inc.

Reputation 87/100 weak security headers no dmarc policy

Classifying

HTML metadata

Title: SageMath - Open-Source Mathematical Software System
Language: en

Open Graph

url: https://www.sagemath.org/
title: SageMath Mathematical Software System - Sage
site name: SageMath Mathematical Software System
description: SageMath is a free and open-source mathematical software system.

Technology

CDN: Cloudflare

Fonts

Google Fonts

Third-party hosts loaded (6)

code.jquery.com×1
fonts.googleapis.com×1
github.com×1
mathstodon.xyz×1
s4is.histats.com×1
www.clustrmaps.com×1

Social

Registration

Registrar

GoDaddy.com, LLC

Created

2007-03-10

Expires

2028-03-10 660 days left

Updated

2026-04-24

Name servers

candy.ns.cloudflare.com
rajeev.ns.cloudflare.com

DNS records live

NS

candy.ns.cloudflare.com
rajeev.ns.cloudflare.com

MX

10 sagemath.openbsd.amsterdam

Verified for

Google

Email authentication weak

SPF

v=spf1 a:trac.sagemath.org include:sendgrid.net a:sagemath.openbsd.amsterdam ?all

neutral (?all)

DMARC

not published

DKIM

mail: v=DKIM1; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCsECBwqoyjTaxblqCLFFuZHXDJhNaehHVOZvcKJsT+KzVa7r/czi0VArr2ZLAH2WC75rvAdydMod5tuhd/ha…
s1: k=rsa; t=s; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAvT1ymmWkCM6PrrbLdY5SgGOcFc4loAYhCFZxysO0A6LHu+P31oL3jwjnm/4l9cvYpaLOMUwVtcwQ76e/QS…
s2: k=rsa; t=s; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCi7Zqw9up1UZ+ShCLNyptz3GCfuACvr+YOikkAV7k2Q6pSlIx9ViYlPl2d4ltw4GCi8Mv7+JfqqH5WrPHo97qCdV…

selectors probed

Certificate (current)

WE1

from 2026-05-14 to 2026-08-12

Expires in 84 days

Full certificate history on crt.sh ↗

HTTP security headers

Header hygiene 30/100 Checked live page: https://www.sagemath.org/

findings

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