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realpython.com

https://realpython.com· First analyzed 17 Feb 2026· Updated 17 Feb 2026
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realpython.com

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Hosting Provider

cloudflare.com

IP Address

172.66.152.40

Server Location

🇨🇦 Toronto, Canada

ASN

AS13335

Organization

Cloudflare, Inc.

Server

Cloudflare

CDN

Cloudflare

WAF

Cloudflare

Nameservers

curt.ns.cloudflare.com.joan.ns.cloudflare.com.

Performance

Page Speed

597 KB
36 requests

Image Optimization

Lazy LoadResponsive
0–49
50–89
90–100

Architecture Stack

Monolithic
⚙️ SSR
Frontend
Styling
Tailwind CSS
Infrastructure
Hosting
Cloudflare
CDN
Cloudflare

Progressive Web App

Web Manifest

Technology Stack

6 Technologies Detected

SEO Analysis

A84/100
13
0
1
R
realpython.comrealpython.com

Python Tutorials – Real Python

Learn Python online: Python tutorials for developers of all skill levels, Python books and courses, Python news, code examples, articles, and more.

Title Length30 chars

Recommended: 50-60 chars

Description Length147 chars

Recommended: 120-160 chars

Issues (1)

  • Missing H1 tag - every page should have one H1

Crawlability

Sitemap

Type: standard

6,964 URLs

robots.txt

12 rules

Sitemap reference found

Allows all crawlers

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C

Security Score

69%Fair
Interactive

HTTPS

WAF

82d

Certificate Details

Type

Domain Validated (DV)

Certificate Authority

Let's Encrypt

Key Algorithm

ECDSA (secp256r1) (256 bit)

Signature

ECDSA with SHA-384

TLS Version

TLSv1.3

HTTP Protocol

HTTP/2+H3

Valid From

10.02.2026

Valid Until

11.05.2026

Subject Alternative Names (2)

*.realpython.comrealpython.com

SHA-256 Fingerprint

5F:94:5E:14:DE:43:3A:0F:D1:C3:AC:AD:E5:FF:54:65:E7:76:BB:CB...

Top Recommendations

Security recommendation preview

HTTP Headers

Developer Console

priority
u=0, i
content-type
text/html; charset=utf-8
cross-origin-opener-policy
same-origin
date
Tue, 17 Feb 2026 16:58:43 GMT
nel
{"report_to":"heroku-nel", "response_headers":["Via"], "max_...
referrer-policy
strict-origin-when-cross-origin
Good Warning Issue

Email Infrastructure

Google Workspace

Score

100

SPF
DKIM
DMARC

DMARC Policy

Reject (Strictest)

MX Records (5)

alt1.aspmx.l.google.com
alt4.aspmx.l.google.com
alt2.aspmx.l.google.com
aspmx.l.google.com

+1 more

Domain Information

realpython.com

Domain Age
13y 6m

Created

06.08.2012

Expires

06.08.2026

Last Updated

22.11.2025

Registrar

1API GmbH

DNSSEC
Not Enabled

Privacy & Compliance

Cookie Consent Banner
Privacy Policy
Terms of Service

GDPR Indicators

Privacy policy page linked

Typography & Readability

-apple-system

69/100
Readability
/30
40/40

18px · LH 1.50

Hierarchy
/20
8/25
WCAG
/25
15/15

Contrast: undefined

Performance
/25
13/20

1 font

Heading Font

-apple-system

Sans

Body Font

-apple-system

Sans18px

Contrast Ratio

--

Reading Comfort

~41 CPL

Needs attention
32px
h2
18px
p

✅ Excellent readability: 18px body text is ideal for all devices.

✅ Optimal line spacing: 1.50 ratio ensures comfortable reading.

✅ Good performance: Using 1 font families keeps load times fast.

✅ Consistent design: Single font family with weight variations is a modern best practice.

✅ Smart font loading: Using font-display: swap prevents invisible text during load.

⚠️ Cramped layout: 56 elements lack adequate spacing.

Business & Marketing Stack

1 Tools Detected

Growing

Behavior Analytics

1

User behavior and product analytics

1

Categories

1

Total Tools

0

Enterprise

0

Mid-Market

Assessment: Growing marketing technology adoption

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Scripts & Styles

20 Resources

14
Scripts
6
Styles
8
Async
3
Defer

Top Script Sources

local(11)googletagmanager.com(1)srv.realpython.net(1)accounts.google.com(1)

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Last analyzed: 17 Feb 2026 at 16:59

Historical Analysis & Change Tracking