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385.4 M

Domains known to webXtrend

9.9 M

New domains in the last 30 days

62.7 M

Social media profiles detected

opencastle.dev

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

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

Its busiest IP address is shared with 749,011 other domains.

The most recent crawl returned the page title “OpenCastle — What Your Team's AI Learns Stays With the Team” and 79,080 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 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 2,900,665 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": "opencastle.dev"}'

Create a free account Read the API docs

Detected social media networks

No social networks found on this website.

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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 8/27/2026
Valid to 11/25/2026
Time until expiry 32 days

Last successful crawl

Title OpenCastle — What Your Team's AI Learns Stays With the Team
Description Open-source CLI: what your team's AI agents learn about the project becomes a lesson reviewed in the pull request, and every teammate's assistant loads it, beside the team's instructions, skills and agents. Works with Claude Code, GitHub Copilot, Cursor, Windsurf, OpenCode, Codex, Antigravity and De...
Content-Length 79,080 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
185.199.108.153 3/2/2026
185.199.109.153 3/2/2026
185.199.110.153 3/2/2026
185.199.111.153 3/2/2026
Name server First seen
ns1.webglobe.cz 3/2/2026
ns2.webglobe.cz 3/2/2026
ns3.webglobe.com 3/2/2026

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

185.199.108.153 749,012 domains · here since 9/16/2026
Domain On this IP since
zzzzsky.com 9/23/2026
zzzzquan.cn 9/18/2026
zzzyss.top 9/18/2026
zzzstudios.de 10/18/2026
zzzstudio.net 10/20/2026
zzzstrongtea.com 9/21/2026
zzzppplll.cn 9/22/2026
zzzpband.com 9/16/2026
zzzoo.app 9/23/2026
zzzmisa.com 9/16/2026
zzzm.online 9/13/2026
zzzionline.com 9/20/2026
and 748,999 more
185.199.109.153 720,856 domains · here since 9/16/2026
Domain On this IP since
zzzzsky.com 9/23/2026
zzzzquan.cn 9/18/2026
zzzyss.top 9/18/2026
zzzstudios.de 10/18/2026
zzzstudio.net 10/20/2026
zzzstrongtea.com 9/21/2026
zzzppplll.cn 9/22/2026
zzzpband.com 9/16/2026
zzzoo.app 9/23/2026
zzzmisa.com 9/16/2026
zzzm.online 9/13/2026
zzzionline.com 9/20/2026
and 720,843 more
185.199.110.153 715,773 domains · here since 9/16/2026
Domain On this IP since
zzzzsky.com 9/23/2026
zzzzquan.cn 9/18/2026
zzzyss.top 9/18/2026
zzzstudios.de 10/18/2026
zzzstudio.net 10/20/2026
zzzstrongtea.com 9/21/2026
zzzppplll.cn 9/22/2026
zzzpband.com 9/16/2026
zzzoo.app 9/23/2026
zzzmisa.com 9/16/2026
zzzm.online 9/13/2026
zzzionline.com 9/20/2026
and 715,760 more
185.199.111.153 715,024 domains · here since 9/16/2026
Domain On this IP since
zzzzsky.com 9/23/2026
zzzzquan.cn 9/18/2026
zzzyss.top 9/18/2026
zzzstudios.de 10/18/2026
zzzstudio.net 10/20/2026
zzzstrongtea.com 9/21/2026
zzzppplll.cn 9/22/2026
zzzpband.com 9/16/2026
zzzoo.app 9/23/2026
zzzmisa.com 9/16/2026
zzzm.online 9/13/2026
zzzionline.com 9/20/2026
and 715,011 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.