htmlvalidator.com

htmlvalidator.com serves a website of its own over HTTPS and under www. It answers on both IPv4 and IPv6, with a valid TLS certificate and MX records for mail.

3,774 other domains share an IP address with it, and 14 domains redirect to it.

The most recent crawl returned the page title “Powerful CSS & HTML Validation Software for Windows, Mac, and Linux ✅” and 23,182 bytes of HTML. The site links to Facebook and X profiles.

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	yes	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	Both	Shows whether the domain only has IPv4 or IPv6 or both.
SSL-Certificate	valid	Shows whether the domain has a valid SSL certificate.
Redirects	14	Number of domains that redirect to this domain.
Reverse IP	3,774	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": "htmlvalidator.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	Google Trust Services
Valid from	8/13/2026
Valid to	11/11/2026
Time until expiry	28 days

Last successful crawl

Title	Powerful CSS & HTML Validation Software for Windows, Mac, and Linux ✅
Description	Download this software to help check and fix HTML, CSS, accessibility, links, SEO (search engine optimization), and more.
Content-Length	23,182 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
104.21.17.146	11/12/2025
172.67.176.216	11/12/2025
50.116.31.253	12/12/2023

IPv6 address	Last updated
2606:4700:3031:0:0:0:ac43:b0d8	6/23/2026
2606:4700:3033:0:0:0:6815:1192	6/23/2026
2606:4700:3031:0:0:0:ac43:b0d8	11/12/2025
2606:4700:3037:0:0:0:6815:1192	11/12/2025

Mail server	Priority	Last updated
val.htmlvalidator.com	10	1/2/2024

Name server	Last updated
damon.ns.cloudflare.com	10/26/2025
kayleigh.ns.cloudflare.com	10/26/2025
ns1.linode.com	12/12/2023
ns2.linode.com	12/12/2023
ns3.linode.com	12/12/2023

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

Most recent redirect domains

Domain	Last seen
htmlval.com	2/23/2026
aiinternetsolutions.com	2/16/2026
cssvalidator.com	2/15/2026
csshtmlvalidator.com	12/15/2025
topstyle4.com	12/12/2025
html5validator.com	9/21/2025
accessibility-testing.com	9/2/2025
html-validator.com	8/24/2025
css-validator.com	7/10/2025
freehtmlvalidator.com	6/14/2025
xhtmlvalidator.com	5/9/2025
htmlvalidators.com	4/26/2025
and 2 more

Reverse IP neighbours

104.21.17.146 948 domains · here since 9/21/2026

Domain	On this IP since
zoodpardakht.com	9/21/2026
zltqzx.com	9/14/2026
zigum.forum	10/13/2026
zhk-123.ru	9/20/2026
zerch.net	9/19/2026
zentrelbox.com	9/17/2026
zenius.io	9/22/2026
zelophrivio.pro	9/16/2026
zelnor.cfd	10/2/2026
zamanakisi.online	9/16/2026
z900.bet	9/15/2026
yyyiyouappguanwang.com.cn	9/25/2026
and 935 more

172.67.176.216 948 domains · here since 9/21/2026

Domain	On this IP since
zoodpardakht.com	9/21/2026
zltqzx.com	9/14/2026
zigum.forum	10/13/2026
zhk-123.ru	9/20/2026
zerch.net	9/19/2026
zentrelbox.com	9/17/2026
zenius.io	9/22/2026
zelophrivio.pro	9/16/2026
zelnor.cfd	10/2/2026
zamanakisi.online	9/16/2026
z900.bet	9/15/2026
yyyiyouappguanwang.com.cn	9/25/2026
and 935 more

2606:4700:3031::ac43:b0d8 939 domains · here since 9/21/2026

Domain	On this IP since
zoodpardakht.com	9/21/2026
zltqzx.com	9/14/2026
zigum.forum	10/13/2026
zhk-123.ru	9/20/2026
zerch.net	9/19/2026
zentrelbox.com	9/17/2026
zenius.io	9/22/2026
zelophrivio.pro	9/16/2026
zelnor.cfd	10/2/2026
zamanakisi.online	9/16/2026
z900.bet	9/15/2026
yyyiyouappguanwang.com.cn	9/25/2026
and 926 more

2606:4700:3033::6815:1192 939 domains · here since 9/21/2026

Domain	On this IP since
zoodpardakht.com	9/21/2026
zltqzx.com	9/14/2026
zigum.forum	10/13/2026
zhk-123.ru	9/20/2026
zerch.net	9/19/2026
zentrelbox.com	9/17/2026
zenius.io	9/22/2026
zelophrivio.pro	9/16/2026
zelnor.cfd	10/2/2026
zamanakisi.online	9/16/2026
z900.bet	9/15/2026
yyyiyouappguanwang.com.cn	9/25/2026
and 926 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.

Dive into our data, search now!