capindex.dev

Get an email when its DNS, website or certificate changes.

capindex.dev serves a website of its own over HTTPS. It answers on IPv4 only, with a valid TLS certificate and MX records for mail.

Its IP address is shared with 1,115,758 other domains.

The most recent crawl returned the page title “CapIndex, Open Standard for Agent-Discoverable Capabilities” and 89,769 bytes of HTML.

Domain properties

Property	Value	Explanation
Top-level domain	.dev	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.	no	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	1,115,759	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": "capindex.dev"}'

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	8/4/2026
Valid to	11/2/2026
Time until expiry	10 days

Last successful crawl

Title	CapIndex, Open Standard for Agent-Discoverable Capabilities
Description	CapIndex is the open protocol and hosted index that lets AI agents discover REST APIs and MCP servers by capability, with no pre-wiring and no human in the loop.
Content-Length	89,769 bytes

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

DNS history

IPv4 address	First seen
76.76.21.21	4/9/2026

Mail server	Priority	First seen
mx1.improvmx.com	10	4/15/2026
mx2.improvmx.com	20	4/15/2026

Name server	First seen
ns1.vercel-dns.com	4/9/2026
ns2.vercel-dns.com	4/9/2026

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

76.76.21.21 1,115,759 domains · here since 9/18/2026

Domain	On this IP since
zzzzzem.tech	9/17/2026
zzzzzebra.com	9/13/2026
zzzzhi.com	9/17/2026
zzzyyp.cn	9/23/2026
zzzygh.cn	9/19/2026
zzzybzsb.com	9/15/2026
zzzy1688.com	9/18/2026
zzzwd.com	9/19/2026
zzzventurescapital.com	9/19/2026
zzztimer.com	9/13/2026
zzztgjg.cn	9/14/2026
zzzsyl.com	9/23/2026
and 1,115,746 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!