21st.dev

Uptime & Server Information

Whois RDAP DNS Records Certificate Uptime Diagnostics History Hide Contact Info

Current Status

Status

Active

Server Type

Vercel

Page Title

React Components, Templates & Themes — 12,000+ Crafted UI | 21st | 21st

Meta Description

12,000+ hand-crafted React and Tailwind CSS components, templates, and shadcn themes by real design engineers. Preview live, install with one command — for you and your AI agent.

Meta Keywords

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Most Recent Data

0 hours, 0 minutes ago

Historical Data

Date	Status	Server
9/6/2026, 10:13:26 AM	Active	Vercel
8/26/2026, 7:41:41 PM	Active	Vercel
8/12/2026, 1:01:40 AM	Active	Vercel
7/8/2026, 7:46:42 PM	Active	Vercel
3/23/2025, 9:41:36 AM	Active	Vercel
3/21/2025, 11:13:19 AM	Active	Vercel
1/31/2025, 3:23:32 PM	Active	Vercel
1/16/2025, 5:03:58 AM	Active	Vercel
1/10/2025, 4:20:32 PM	Active	Vercel

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This is a one-time check. Turn on monitoring and we'll watch the domains that matter to you continuously, notifying you the moment anything moves across all three signals:

Uptime

We visit the site from multiple regions worldwide and email you within minutes if it goes down, with a per-region breakdown so a real outage stands out from a regional blip.

DNS changes

We watch NS, MX, CAA, DNSSEC, CNAME and A/AAAA records, and identify the host, network, and ASN behind them, so a real migration or hijack stands out from routine noise.

TLS certificate

We warn you 30, 14, 7, and 1 days before it expires, and flag it if the issuing authority changes or the certificate is unexpectedly replaced.

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About Website Uptime Monitoring

Use the Who.is uptime information to track the availability and server information of websites. This helps track:

Website availability and response status
Server software and configuration
Meta information including titles and descriptions
Historical uptime patterns

This information is valuable for website owners, system administrators, and anyone interested in monitoring website reliability and performance.

Metrics we monitor

Uptime percentage: The percentage of time your website is accessible
Response time: How quickly your server responds to requests
Status codes: HTTP response codes indicating server status

Disclaimer: Who.is is not affiliated with, endorsed by, or connected to any of the domains displayed on this page. We provide this information as a public service for informational purposes only.