pysdr.org

.org crawl

First seen 2026-05-11 · Last seen 2026-05-11 · ok HTTP/1.1 200 2416 ms crawled 2026-05-16

US · 104.21.91.217 · AS13335 Cloudflare, Inc.

Reputation 87/100 weak security headers no dmarc policy

Classifying

HTML metadata

Title: PySDR: A Guide to SDR and DSP using Python

Technology

CDN: Cloudflare

Analytics

Google Tag Manager

Third-party hosts loaded (2)

i.creativecommons.org×1
www.googletagmanager.com×1

Social

Registration

Registrar

Cloudflare, Inc.

Created

2017-06-22

Expires

2026-06-22 33 days left

Updated

2025-05-28

Name servers

betty.ns.cloudflare.com
damiete.ns.cloudflare.com

DNS records live

NS

betty.ns.cloudflare.com
damiete.ns.cloudflare.com

MX

12 route1.mx.cloudflare.net
50 route2.mx.cloudflare.net
53 route3.mx.cloudflare.net

TXT

google-site-verification=fwds4IyD7VZP3NCoQjYdvDWCWDI825_PzzHtVEgCt8c
ca3-2ea0675e7bdd4370bfe0f9ff9e1cbe4b

Email authentication weak

SPF: v=spf1 include:_spf.mx.cloudflare.net ~all
softfail (~all)
DMARC: not published
DKIM: no key found at common selectors

Certificate (current)

WE1

from 2026-04-07 to 2026-07-06

Expires in 48 days

Full certificate history on crt.sh ↗

HTTP security headers

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

findings

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

Links to (8)

Linked from (1)

finalrewind.org×1