understandphysics.com

understandphysics.com serves a website of its own over HTTPS and under www. It answers on IPv4 only, with a valid TLS certificate.

2,431,085 other domains share an IP address with it.

The most recent crawl returned the page title “Understand Physics” and 24,774 bytes of HTML.

Domain properties

Property	Value	Explanation
Top-level domain	.com	Statistics for all domains we know under this TLD.
Has website	yes	A website is hosted under the domain, which does not redirect to an external domain.
Has MX-record	no	The domain has an MX record.
External redirect	no	The domain redirects to another domain.
Redirect to https	yes	The domain redirects to https.
Redirect to www.	yes	The domain redirects to www.domain.
Only with www.	no	The domain can only be reached with the subdomain "www".
Only DNS, no website	no	There are no A or AAAA records in DNS.
IP-Address	only IPv4	Shows whether the domain only has IPv4 or IPv6 or both.
SSL-Certificate	valid	Shows whether the domain has a valid SSL certificate.
Redirects	0	Number of domains that redirect to this domain.
Reverse IP	2,431,085	Number of domains with the same IP(s).

This data through the API

The data on this page is also available as JSON: /lookup for the key facts, /reverseip, /redirect and /similar for the lists, and /dnshistory with Basic and Premium. A free account comes with an API key and 100 calls a day.

curl -X POST https://api.webxtrend.com/v1.0/lookup \
  -H 'Content-Type: application/json' \
  -d '{"token": "YOUR_TOKEN", "query": "understandphysics.com"}'

Create a free account Read the API docs

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Websites whose start page offers something similar, found by comparing the text of their start pages, across languages. Near-identical copies, parking pages and error pages are left out. The full list of up to 100 comes through the API: similar websites.

Last SSL certificate

Issuer	Let's Encrypt
Valid from	7/31/2026
Valid to	10/29/2026
Time until expiry	14 days

Last successful crawl

Title	Understand Physics
Description	Learn physics through clear explanations, interactive visualizations, and structured courses.
Content-Length	24,774 bytes

Title and description as published by the page itself in its own <title> and <meta name="description"> tags.

DNS history

IPv4 address	Last updated
64.29.17.1	10/11/2026
64.29.17.65	10/11/2026
216.198.79.1	10/2/2026
216.198.79.65	10/2/2026
216.198.79.1	9/24/2026

Mail server	Priority	Last updated
mx1.privateemail.com	10	3/19/2026
mx2.privateemail.com	10	3/19/2026
mx.plingest.com	10	2/25/2026
mx1.privateemail.com	10	12/20/2025
mx2.privateemail.com	10	12/20/2025

Name server	Last updated
ns1.vercel-dns.com	4/2/2026
ns2.vercel-dns.com	4/2/2026
dns1.registrar-servers.com	3/19/2026
dns2.registrar-servers.com	3/19/2026
dns101.registrar-servers.com	2/25/2026

The five most recent states of each record type. The full history comes through the API: DNS history.

Most recent redirect domains

No domains found.

Reverse IP neighbours

64.29.17.1 461,110 domains · here since 10/5/2026

Domain	On this IP since
zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz.uk	10/9/2026
zzzzzzz.app	10/4/2026
zzzxc.com	10/9/2026
zzznaakkee.xyz	9/24/2026
zzzdevelopment.com	10/13/2026
zzyy6559.xyz	9/19/2026
zzyraai.com	9/27/2026
zzykxx.com	9/16/2026
zzstudio.xin	10/13/2026
zzsfstudy.top	9/30/2026
zzpiping.org	10/3/2026
zzpelle.nl	10/7/2026
and 461,097 more

216.198.79.1 1,969,975 domains · here since 9/23/2026

Domain	On this IP since
zzzzzzzzzzzzzzzzzzzzzzzzzzzzzzzz.uk	10/9/2026
zzzzzly.online	9/22/2026
zzzzrakesh.me	9/19/2026
zzzznayu.ru	9/19/2026
zzzzdevelopment.com	10/13/2026
zzzzas.app	10/12/2026
zzzz.yt	9/19/2026
zzzz.lt	9/15/2026
zzzxc.com	10/9/2026
zzztools.com	9/20/2026
zzzsunny.space	9/13/2026
zzzril.art	9/22/2026
and 1,969,962 more

Sharing an address does not always mean sharing a server: on a CDN or a large hosting platform, millions of unrelated domains answer on the same few addresses. We measured how far that goes in Half the web sits on 276 IP addresses. The complete list of neighbours, also for an IP address, comes through the API: reverse IP lookup.

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