react.dev B

24 hours
100.00%
7 days
100.00%
30 days
100.00%
IPv4 / IPv6
16 0
SSL Certificate
82d
Security Headers
0/6
Status Badges
Status Uptime 30d Uptime 7d Response Time SSL Performance Accessibility SEO Security Headers Uptime 24h Incidents IPv4/IPv6
Click any snippet to copy. Use Markdown for GitHub READMEs, HTML for websites.
Badge Markdown HTML
Status [![Status](https://updown.website/badge/react.dev/status.svg)](https://updown.website/site/react.dev/) <a href="https://updown.website/site/react.dev/"><img src="https://updown.website/badge/react.dev/status.svg" alt="Status"></a>
Uptime [![Uptime](https://updown.website/badge/react.dev/uptime.svg)](https://updown.website/site/react.dev/) <a href="https://updown.website/site/react.dev/"><img src="https://updown.website/badge/react.dev/uptime.svg" alt="Uptime"></a>
Response Time [![Response Time](https://updown.website/badge/react.dev/response-time.svg)](https://updown.website/site/react.dev/) <a href="https://updown.website/site/react.dev/"><img src="https://updown.website/badge/react.dev/response-time.svg" alt="Response Time"></a>
SSL [![SSL](https://updown.website/badge/react.dev/ssl.svg)](https://updown.website/site/react.dev/) <a href="https://updown.website/site/react.dev/"><img src="https://updown.website/badge/react.dev/ssl.svg" alt="SSL"></a>
Performance [![Performance](https://updown.website/badge/react.dev/cwv.svg)](https://updown.website/site/react.dev/) <a href="https://updown.website/site/react.dev/"><img src="https://updown.website/badge/react.dev/cwv.svg" alt="Performance"></a>
Accessibility [![Accessibility](https://updown.website/badge/react.dev/cwv.svg?category=accessibility)](https://updown.website/site/react.dev/) <a href="https://updown.website/site/react.dev/"><img src="https://updown.website/badge/react.dev/cwv.svg?category=accessibility" alt="Accessibility"></a>
SEO [![SEO](https://updown.website/badge/react.dev/cwv.svg?category=seo)](https://updown.website/site/react.dev/) <a href="https://updown.website/site/react.dev/"><img src="https://updown.website/badge/react.dev/cwv.svg?category=seo" alt="SEO"></a>
Security Headers [![Security Headers](https://updown.website/badge/react.dev/security-headers.svg)](https://updown.website/site/react.dev/) <a href="https://updown.website/site/react.dev/"><img src="https://updown.website/badge/react.dev/security-headers.svg" alt="Security Headers"></a>
Uptime 24h [![Uptime 24h](https://updown.website/badge/react.dev/uptime.svg?period=24h)](https://updown.website/site/react.dev/) <a href="https://updown.website/site/react.dev/"><img src="https://updown.website/badge/react.dev/uptime.svg?period=24h" alt="Uptime 24h"></a>
Incidents [![Incidents](https://updown.website/badge/react.dev/incidents.svg)](https://updown.website/site/react.dev/) <a href="https://updown.website/site/react.dev/"><img src="https://updown.website/badge/react.dev/incidents.svg" alt="Incidents"></a>
IPv4/IPv6 [![IPv4/IPv6](https://updown.website/badge/react.dev/ipv46.svg)](https://updown.website/site/react.dev/) <a href="https://updown.website/site/react.dev/"><img src="https://updown.website/badge/react.dev/ipv46.svg" alt="IPv4/IPv6"></a>
Site Health (24 h)
HTTP Response DNS Lookup Ping Up Down Reports Incident
Monitoring
Recent HTTP Checks (24 h)
Total Checks
9
Success Rate
100%
Avg Response
3322 ms
Min / Max
78 / 8274 ms
Recent Checks
12:39 11:47
Time Status Code Response Agent Error
11:47:07 UP 200 595 ms prod-local —
09:09:05 UP 200 4773 ms prod-local —
05:38:18 UP 200 8274 ms prod-local —
03:52:02 UP 200 3989 ms prod-local —
01:38:16 UP 200 3972 ms prod-local —
23:44:02 UP 200 3921 ms prod-local —
18:30:37 UP 200 4190 ms prod-local —
16:54:25 UP 200 78 ms prod-local —
12:39:33 UP 200 104 ms prod-local —
Incident History

No incidents recorded — all clear!

Community
0
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Service Checks (Banner Grab)
2 up 0 down
Status Port Service Version IP Banner Latency Checked
80 http — 76.76.21.22 HTTP/1.0 308 Permanent Redirect Content-Type 2.1 ms 1 day, 8 hours ago
443 https — 76.76.21.22 — 502.3 ms 1 day, 8 hours ago
Security
SSL / TLS Certificate
82
days left
Valid
Apr 15, 2026 Jul 14, 2026
Issued → Expires
Subject commonName=react.dev
Issuer countryName=US, organizationName=Let's Encrypt, commonName=R13
Valid From 2026-04-15 01:35
Expires 2026-07-14 01:35
Serial Number 06BC2E979D5DC4ED954DBF5C97152D8AEE54
SHA-256 Fingerprint 14:2a:81:0f:83:0b:68:c3:e3:07:3b:5f:06:d0:9f:f4:39:8e:26:ba:f7:1d:3c:89:88:b3:6c:b1:1e:98:6a:18
Subject Alt Names react.dev
Last Checked 2026-04-22 11:47:08
Latest HTTP Response Details
Final URL https://react.dev/
Status Code 200
Response Time 595 ms
Content Size 266 KB (266.1 KB)
Content Type text/html; charset=utf-8
Server Vercel
TLS Version TLSv1.3
TLS Cipher TLS_AES_128_GCM_SHA256
Redirects 0
Checked 2026-04-22 11:47:07
Email Security Posture
MX Records
SPF
DMARC
BIMI
MTA-STS
Weak
Overall
DNS & Network
DNS Intelligence (24h)
Avg Resolution
17.9 ms
Min / Max
4.4 / 43.9 ms
Record Types
4
Lookups (24h)
45
DNS Records
A
66.33.60.67 76.76.21.98
282s 29.6ms
NS
edna.ns.cloudflare.com norm.ns.cloudflare.com
86400s 4.3ms
TXT
Domain Verification (1)
google-site-verification=a5RC7LuUuYSWBrPBwybnA2bPZSh4aYEDbYEg7O4t9l4
300s 21.1ms
SOA
Primary NS
edna.ns.cloudflare.com
Admin
dns@cloudflare.com
Serial: 2400323429 Refresh: 2h Retry: 40m Expire: 7d Min TTL: 30m
1800s 5.3ms
DNS Propagation Inconsistent
Resolver IPs Returned Response Time Status
Quad9 66.33.60.130 76.76.21.61 28.89ms
Google 66.33.60.35 76.76.21.123 17.9ms
AdGuard 66.33.60.129 76.76.21.22 120.64ms
OpenDNS 66.33.60.129 76.76.21.22 65.33ms
Cloudflare 66.33.60.67 76.76.21.98 7.24ms
WHOIS / Domain Registration
DNSSEC
—
WHOIS Last Checked
2026-04-22 03:52
Resolution Time (A/AAAA recent)
01:38 11:47
Time Type Values TTL Resolution Nameserver
11:47:06 SOA edna.ns.cloudflare.com dns.cloudflare.com 2400323429 10000 2400 604800 1800 1800s 5.3 ms 10.89.0.1
11:47:06 TXT google-site-verification=a5RC7LuUuYSWBrPBwybnA2bPZSh4aYEDbYEg7O4t9l4 300s 21.1 ms 10.89.0.1
11:47:06 NS edna.ns.cloudflare.com norm.ns.cloudflare.com 86400s 4.3 ms 10.89.0.1
11:47:06 AAAA — — 19.5 ms —
11:47:06 A 66.33.60.67 76.76.21.98 282s 29.6 ms 10.89.0.1
09:09:05 SOA edna.ns.cloudflare.com dns.cloudflare.com 2400323429 10000 2400 604800 1800 1800s 21.3 ms 10.89.0.1
09:09:05 TXT google-site-verification=a5RC7LuUuYSWBrPBwybnA2bPZSh4aYEDbYEg7O4t9l4 300s 19.2 ms 10.89.0.1
09:09:05 NS edna.ns.cloudflare.com norm.ns.cloudflare.com 86400s 5.1 ms 10.89.0.1
09:09:05 AAAA — — 4.9 ms —
09:09:05 A 76.76.21.123 66.33.60.35 122s 34.1 ms 10.89.0.1
05:38:18 SOA edna.ns.cloudflare.com dns.cloudflare.com 2400323429 10000 2400 604800 1800 1800s 4.8 ms 10.89.0.1
05:38:18 TXT google-site-verification=a5RC7LuUuYSWBrPBwybnA2bPZSh4aYEDbYEg7O4t9l4 300s 21.8 ms 10.89.0.1
05:38:18 NS edna.ns.cloudflare.com norm.ns.cloudflare.com 86400s 4.7 ms 10.89.0.1
05:38:18 AAAA — — 43.9 ms —
05:38:18 A 76.76.21.93 66.33.60.194 148s 22.1 ms 10.89.0.1
03:52:01 SOA edna.ns.cloudflare.com dns.cloudflare.com 2400323429 10000 2400 604800 1800 1800s 5.1 ms 10.89.0.1
03:52:01 TXT google-site-verification=a5RC7LuUuYSWBrPBwybnA2bPZSh4aYEDbYEg7O4t9l4 300s 6.1 ms 10.89.0.1
03:52:01 NS edna.ns.cloudflare.com norm.ns.cloudflare.com 86400s 104.3 ms 10.89.0.1
03:52:01 AAAA — — 19.8 ms —
03:52:01 A 76.76.21.98 66.33.60.67 297s 19.7 ms 10.89.0.1
01:38:15 SOA edna.ns.cloudflare.com dns.cloudflare.com 2400323429 10000 2400 604800 1800 1800s 17.4 ms 10.89.0.1
01:38:15 TXT google-site-verification=a5RC7LuUuYSWBrPBwybnA2bPZSh4aYEDbYEg7O4t9l4 300s 19.0 ms 10.89.0.1
01:38:15 NS edna.ns.cloudflare.com norm.ns.cloudflare.com 21600s 20.2 ms 10.89.0.1
01:38:15 AAAA — — 15.0 ms —
01:38:15 A 66.33.60.66 76.76.21.142 40s 26.1 ms 10.89.0.1
23:44:01 SOA edna.ns.cloudflare.com dns.cloudflare.com 2400323429 10000 2400 604800 1800 1800s 21.3 ms 10.89.0.1
23:44:01 TXT google-site-verification=a5RC7LuUuYSWBrPBwybnA2bPZSh4aYEDbYEg7O4t9l4 300s 7.2 ms 10.89.0.1
23:44:01 NS edna.ns.cloudflare.com norm.ns.cloudflare.com 86400s 5.3 ms 10.89.0.1
23:44:01 AAAA — — 4.8 ms —
23:44:01 A 76.76.21.22 66.33.60.129 28s 20.0 ms 10.89.0.1
18:30:36 SOA edna.ns.cloudflare.com dns.cloudflare.com 2400323429 10000 2400 604800 1800 1800s 5.2 ms 10.89.0.1
18:30:36 TXT google-site-verification=a5RC7LuUuYSWBrPBwybnA2bPZSh4aYEDbYEg7O4t9l4 300s 20.9 ms 10.89.0.1
18:30:36 NS edna.ns.cloudflare.com norm.ns.cloudflare.com 1551s 0.9 ms 10.89.0.1
18:30:36 AAAA — — 4.4 ms —
18:30:36 A 76.76.21.164 66.33.60.34 52s 7.8 ms 10.89.0.1
16:54:25 SOA edna.ns.cloudflare.com dns.cloudflare.com 2400323429 10000 2400 604800 1800 1800s 5.3 ms 10.89.0.1
16:54:25 TXT google-site-verification=a5RC7LuUuYSWBrPBwybnA2bPZSh4aYEDbYEg7O4t9l4 300s 19.4 ms 10.89.0.1
16:54:25 NS edna.ns.cloudflare.com norm.ns.cloudflare.com 86400s 5.7 ms 10.89.0.1
16:54:25 AAAA — — 5.3 ms —
16:54:25 A 66.33.60.193 76.76.21.241 81s 4.4 ms 10.89.0.1
12:39:32 SOA edna.ns.cloudflare.com dns.cloudflare.com 2400323429 10000 2400 604800 1800 1800s 19.3 ms 10.89.0.1
12:39:32 TXT google-site-verification=a5RC7LuUuYSWBrPBwybnA2bPZSh4aYEDbYEg7O4t9l4 300s 25.2 ms 10.89.0.1
12:39:32 NS edna.ns.cloudflare.com norm.ns.cloudflare.com 21600s 25.3 ms 10.89.0.1
12:39:32 AAAA — — 20.4 ms —
12:39:32 A 76.76.21.61 66.33.60.130 4s 20.2 ms 10.89.0.1
Open Ports 6
Open Ports
6
IPs Scanned
6
Port Protocol Service IP Address Status Latency Banner
80 TCP http 66.33.60.34 Open 3.9 ms —
80 TCP http 76.76.21.22 Open 2.1 ms —
80 TCP http 66.33.60.67 Open 3.5 ms —
443 TCP https 66.33.60.67 Open 1.5 ms —
443 TCP https 66.33.60.34 Open 2.9 ms —
443 TCP https 76.76.21.22 Open 1.5 ms —
Active IP Addresses
IP Address Version Reverse DNS CIDR Country City ASN Reputation First Seen Last DNS Hits Misses Uptime % Avg Latency
66.33.60.67 IPv4 — 66.33.60.0/24 US — AS16509 Amazon.com, Inc. Clean 2026-04-21 03:26 2026-04-22 11:47 2 0 100.0% 2.8 ms
76.76.21.98 IPv4 — 76.76.21.0/24 US Walnut AS16509 Amazon.com, Inc. Clean 2026-04-21 03:26 2026-04-22 11:47 2 0 100.0% 2.5 ms
66.33.60.35 IPv4 — — US — AS16509 Amazon.com, Inc. — 2026-04-19 22:02 2026-04-22 09:09 1 0 100.0% 8.4 ms
76.76.21.123 IPv4 — — US Walnut AS16509 Amazon.com, Inc. — 2026-04-19 22:02 2026-04-22 09:09 1 0 100.0% 8.5 ms
66.33.60.194 IPv4 — — US — AS16509 Amazon.com, Inc. — 2026-04-22 05:38 2026-04-22 05:38 1 0 100.0% 3.5 ms
76.76.21.93 IPv4 — — US Walnut AS16509 Amazon.com, Inc. — 2026-04-22 05:38 2026-04-22 05:38 1 0 100.0% 3.4 ms
66.33.60.66 IPv4 — — US — AS16509 Amazon.com, Inc. — 2026-04-20 05:51 2026-04-22 01:38 1 0 100.0% 1.8 ms
76.76.21.142 IPv4 — — US Walnut AS16509 Amazon.com, Inc. — 2026-04-20 05:51 2026-04-22 01:38 1 0 100.0% 1.9 ms
76.76.21.22 IPv4 — 76.76.21.0/24 US Walnut AS16509 Amazon.com, Inc. Clean 2026-04-20 02:45 2026-04-21 23:44 1 0 100.0% 15.1 ms
66.33.60.129 IPv4 — 66.33.60.0/24 US — AS16509 Amazon.com, Inc. Clean 2026-04-20 02:45 2026-04-21 23:44 1 0 100.0% 15.1 ms
66.33.60.34 IPv4 — 66.33.60.0/24 US — AS16509 Amazon.com, Inc. Clean 2026-04-19 18:33 2026-04-21 18:30 1 0 100.0% 4.0 ms
76.76.21.164 IPv4 — 76.76.21.0/24 US Walnut AS16509 Amazon.com, Inc. Clean 2026-04-19 18:33 2026-04-21 18:30 1 0 100.0% 5.5 ms
66.33.60.193 IPv4 — — US — AS16509 Amazon.com, Inc. — 2026-04-19 17:46 2026-04-21 16:54 1 0 100.0% 4.7 ms
76.76.21.241 IPv4 — — US Walnut AS16509 Amazon.com, Inc. — 2026-04-19 17:46 2026-04-21 16:54 1 0 100.0% 4.8 ms
76.76.21.61 IPv4 — — US Walnut AS16509 Amazon.com, Inc. — 2026-04-19 17:03 2026-04-21 12:39 1 0 100.0% 2.1 ms
66.33.60.130 IPv4 — — US — AS16509 Amazon.com, Inc. — 2026-04-19 17:03 2026-04-21 12:39 1 0 100.0% 1.6 ms
Technology
Technology Stack 12 detected
HTTP/2
HTTP/3 (QUIC)
12
Technologies
API 1
Public CORS API
90%
CORS wildcard origin
Analytics 2
70%
GA4 via gtag.js
70%
GTM
DNS 1
85%
NS record: edna.ns.cloudflare.com
E-commerce 1
70%
Shopify Hydrogen
Framework 1
70%
Next.js build path
Library 1
70%
Video.js player
Platform 1
90%
X-Vercel-Id header
Service 1
70%
Algolia search
Social 2
70%
Open Graph meta tags
70%
Twitter Card meta
Verification 1
85%
TXT verification: google-site-verification=a5RC7LuUuYSWBrPBwybnA2bPZSh4aYEDbYEg…
Technology Provider 1 tech · 1 sites

This domain provides technology used by other monitored sites.

React
aws.amazon.com clarity.microsoft.com clearbit.com emotion.sh notion.so shopify.dev styled-components.com unpkg.com
Discovery
Crawl Configuration
robots.txt No sitemap
robots.txt 
User-agent: *
Disallow:
Sitemap

No sitemap discovered.
Checked /robots.txt, /sitemap.xml, and /sitemap_index.xml

Discovered Sub-domains 39
Certificate Transparency 17 Wordlist Brute-force 22
Subdomain Source Status Code Response IPs Last Checked
17.react.dev Certificate Transparency Pending — — — Never
18.react.dev Certificate Transparency Pending — — — Never
19.react.dev Certificate Transparency Pending — — — Never
ar.react.dev Wordlist Brute-force UP 200 128 ms — 1 day, 22 hours ago
az.react.dev Certificate Transparency Pending — — — Never
bg.react.dev Wordlist Brute-force UP 404 480 ms — 1 day, 22 hours ago
ca.react.dev Wordlist Brute-force UP 404 522 ms — 1 day, 22 hours ago
conf.react.dev Certificate Transparency Pending — — — Never
conf2024.react.dev Certificate Transparency Pending — — — Never
de.react.dev Wordlist Brute-force UP 200 78 ms — 1 day, 22 hours ago
es.react.dev Wordlist Brute-force UP 200 76 ms — 1 day, 22 hours ago
fa.react.dev Certificate Transparency Pending — — — Never
fr.react.dev Wordlist Brute-force UP 200 144 ms — 1 day, 22 hours ago
he.react.dev Certificate Transparency Pending — — — Never
hi.react.dev Certificate Transparency Pending — — — Never
hu.react.dev Wordlist Brute-force UP 200 125 ms — 1 day, 22 hours ago
id.react.dev Wordlist Brute-force UP 200 79 ms — 1 day, 22 hours ago
it.react.dev Wordlist Brute-force UP 200 78 ms — 1 day, 22 hours ago
ja.react.dev Certificate Transparency Pending — — — Never
ko.react.dev Wordlist Brute-force UP 200 95 ms — 1 day, 22 hours ago
legacy.react.dev Wordlist Brute-force Pending — — — Never
lt.react.dev Wordlist Brute-force Pending — — — Never
ml.react.dev Wordlist Brute-force Pending — — — Never
mn.react.dev Certificate Transparency Pending — — — Never
nl.react.dev Wordlist Brute-force Pending — — — Never
pl.react.dev Wordlist Brute-force Pending — — — Never
playground.react.dev Wordlist Brute-force Pending — — — Never
pt-br.react.dev Certificate Transparency Pending — — — Never
ro.react.dev Wordlist Brute-force Pending — — — Never
ru.react.dev Wordlist Brute-force Pending — — — Never
si.react.dev Wordlist Brute-force Pending — — — Never
th.react.dev Wordlist Brute-force Pending — — — Never
tr.react.dev Certificate Transparency Pending — — — Never
translations.react.dev Certificate Transparency Pending — — — Never
uk.react.dev Wordlist Brute-force Pending — — — Never
vi.react.dev Certificate Transparency Pending — — — Never
www.react.dev Wordlist Brute-force Pending — — — Never
zh-hans.react.dev Certificate Transparency Pending — — — Never
zh-hant.react.dev Certificate Transparency Pending — — — Never