www.feynmanlectures.caltech.edu
Registered
Page analyze update date:
2026/02/25 17:37:12
Last whois update date:
2026/07/17 05:37:24
Domain Status
Registered
Paid till
31.07.2027
Available from
30.08.2027
×
![Fullscreen website screenshot]()
www.feynmanlectures.caltech.edu Website screenshot
SEO Score
48.63%
71
Score achieved
146
Maximum score
Main Information
Title: The Feynman Lectures on Physics
Description: unknown
Keywords: unknown
Page Encoding:
utf-8
Body and server charset are different!
Page Filesize: 12 KB
Server Information
IP: 172.64.151.150
Location: ,,,,,,
Http Server: cloudflare
Meta Tags List
- name: viewport content: width=device-width, initial-scale=1.0
- equiv: Content-Type content: text/html; charset=UTF-8
- charset: UTF-8
Internal Links
Whois Information
update_date: 30-Jan-2026
update_time: 1769731200
expiration_date: 31-Jul-2027
expiration_time: 1816992000
Whois Raw Data
This Registry database contains ONLY .EDU domains.
The data in the EDUCAUSE Whois database is provided
by EDUCAUSE for information purposes in order to
assist in the process of obtaining information about
or related to .edu domain registration records.
The EDUCAUSE Whois database is authoritative for the
.EDU domain.
A Web interface for the .EDU EDUCAUSE Whois Server is
available at: http://whois.educause.edu
By submitting a Whois query, you agree that this information
will not be used to allow, enable, or otherwise support
the transmission of unsolicited commercial advertising or
solicitations via e-mail. The use of electronic processes to
harvest information from this server is generally prohibited
except as reasonably necessary to register or modify .edu
domain names.
-------------------------------------------------------------
Domain Name: CALTECH.EDU
Registrant:
California Institute of Technology
Information Management Systems and Services MS 1-10
1200 East California Boulevard
Pasadena, CA 91125
USA
Administrative Contact:
Domain Admin
California Institute of Technology
1200 E. California Blvd.
MS 1-10
Pasadena, CA 91125
USA
+1.6263953500
[email protected]
Technical Contact:
California Institute of Technology
1200 E. California Blvd.
MS 1-10
Pasadena, CA 91125
USA
+1.6263953500
[email protected]
Name Servers:
NS0090.SECONDARY.CLOUDFLARE.COM
NS0239.SECONDARY.CLOUDFLARE.COM
Domain record activated: 06-Jan-1986
Domain record last updated: 30-Jan-2026
Domain expires: 31-Jul-2027
SEO Audit
Technical SEO
✓
Response Code
200
Status 200 OK - page loads correctly.
!
Character Encoding
Page: utf-8, Header:
Character encoding mismatch between HTML and HTTP headers.
✓
Page Size
13050 bytes
Page size acceptable for fast loading.
✓
Resources
11 total
Optimal number of resources.
✓
Hreflang Tags
0 hreflang tags
Add hreflang tags if you have multilingual content.
!
Robots.txt
Missing
Add robots.txt file to control search engine crawling.
!
Sitemap
Not found
Add sitemap.xml and reference it in robots.txt.
✓
HTTPS
Yes
Secure HTTPS connection enabled.
✓
Compression
gzip
Gzip or Zstd compression enabled for faster loading.
✓
Caching
max-age=2628000, public
Cache-control headers properly set.
✓
Page Speed
1.73 ms
Excellent loading speed.
On-Page SEO
✓
Title
The Feynman Lectures on Physics
Good title length (30-60 characters).
!
Meta Description
Lenght:0
Add a meta description (100-160 characters recommended).
!
H1 Heading
0 found - ""
Add exactly one H1 heading with primary keywords.
!
Word Count
491
Content somewhat short. Expand to 500+ words for optimal SEO.
!
Canonical Tag
Add canonical tag to prevent duplicate content issues.
✓
Duplicate Meta
[]
No duplicate meta tags found.
✓
Keywords
Meta keywords are optional (not used by major search engines).
Content and UX
!
Language
Add lang attribute to tag for accessibility and SEO.
!
Images
6 total, 5 missing ALT
Add ALT text to images for accessibility and SEO.
✓
Viewport
width=device-width, initial-scale=1.0
Viewport meta tag properly set for mobile devices.
!
Open Graph
Missing: og:title, og:description, og:image, og:url
Add missing OpenGraph tags for social media sharing: og:title, og:description, og:image, og:url
!
Structured Data
0 JSON-LD scripts
Add structured data (JSON-LD) for rich snippets and better SEO.
Positions in Google
Search Phrases - Google
| Position | Phrase | Page | Snippet |
|---|---|---|---|
| 5 | /I_26.html | ||
| 8 | /I_07.html |