proofstack.build

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

proofstack.build serves a website of its own over HTTPS. It answers on IPv4 only, with a valid TLS certificate.

1,109,281 other domains share an IP address with it.

The most recent crawl returned the page title “ProofStack — Audit AI-Built Apps” and 35,408 bytes of HTML.

Domain properties

Property	Value	Explanation
Top-level domain	.build	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.	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	1,109,281	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": "proofstack.build"}'

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	8/8/2026
Valid to	11/6/2026
Time until expiry	15 days

Last successful crawl

Title	ProofStack — Audit AI-Built Apps
Description	The independent audit layer for AI-built software — on top of Upwork, Fiverr, or a direct hire. Star ratings measure satisfaction; we measure the code: security, maintainability, and whether it does what was promised. We verify, we don't broker.
Content-Length	35,408 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
76.76.21.21	6/8/2026

Name server	Last updated
lisa.ns.cloudflare.com	6/8/2026
seamus.ns.cloudflare.com	6/8/2026

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 1,109,281 domains · here since 9/17/2026

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 1,109,268 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!