Check-Host.cc

Domain

reactjs.org

Aggregated from public BGP, CT logs, our scan layer, honeypots and global probes.

Run a live full scan of reactjs.org

On-demand: ports, banners, TLS, tech-stack, subdomains and origin/IP-leak detection. Results are shared publicly for everyone to link to.

Deep-scan now
Hosting IPs
23
A/AAAA targets
Subdomains
48
CT + scan + body
Record Types
4
seen in DNS
Observed Certs
7
in our scans

DNS Records

A
76.76.21.21
AAAA
MX
NS
hattie.ns.cloudflare.com, joan.ns.cloudflare.com, junade.ns.cloudflare.com, rohin.ns.cloudflare.com
TXT
google-site-verification=8cSSWOK5msv3tzIFqXSvcb-KzSdG_E9g_H0bLIKhcWE, google-site-verification=phixj4WdeUCjzqWQjOkCLkD8y6oeiJbqnCihojcYOWA, v=spf1 include:spf.mandrillapp.com include:sparkpostmail.com ~all
CNAME
CAA
0 issue "comodoca.com", 0 issue "digicert.com; cansignhttpexchanges=yes", 0 issue "letsencrypt.org", 0 issue "pki.goog; cansignhttpexchanges=yes", 0 issue "ssl.com", 0 issuewild "comodoca.com", 0 issuewild "digicert.com; cansignhttpexchanges=yes", 0 issuewild "letsencrypt.org"

WHOIS / Registration

Registration data planned

Registrar, creation/expiry dates and domain status via RDAP. Rolling out gradually — bulk WHOIS is rate-limited, so we resolve on a prioritized cadence.

Subdomains

Every subdomain we know about — harvested from CT-log SANs, scan-observed certs and HTML body references — paired with its current A/AAAA target.

Subdomain Resolves to Last seen
conf2015.reactjs.org 2026-06-21 23:04:07.065
fr.reactjs.org 2026-07-20 12:26:00.405
ja.reactjs.org 2026-05-26 07:46:21.929
az.reactjs.org 2026-07-20 14:53:35.212
beta.zh-hant.reactjs.org 2026-06-15 20:12:17.913
conf.reactjs.org 2026-06-22 23:50:17.353
conf2019.reactjs.org 2026-06-04 07:39:35.750
fa.reactjs.org 2026-07-23 21:02:03.241
hu.reactjs.org 2026-07-19 18:03:22.363
it.legacy.reactjs.org 2026-06-20 11:58:22.164
ja.legacy.reactjs.org 2026-06-05 20:06:51.449
legacy.reactjs.org 2026-05-27 09:15:10.263
pt-br.legacy.reactjs.org 2026-06-06 01:46:57.451
ro.reactjs.org 2026-07-20 03:07:53.558
th.reactjs.org 2026-07-19 17:15:05.667
zh-hans.reactjs.org 2026-05-27 01:49:21.268
zh-hant.legacy.reactjs.org 2026-06-17 21:23:44.397
17.reactjs.org
1970-01-01 00:00:00.000
beta.hi.reactjs.org
1970-01-01 00:00:00.000
beta.pl.reactjs.org
1970-01-01 00:00:00.000
bg.reactjs.org
1970-01-01 00:00:00.000
de.reactjs.org
1970-01-01 00:00:00.000
discuss.reactjs.org
1970-01-01 00:00:00.000
ka.reactjs.org
1970-01-01 00:00:00.000
km.reactjs.org
1970-01-01 00:00:00.000
ku.reactjs.org
1970-01-01 00:00:00.000
mn.reactjs.org
1970-01-01 00:00:00.000
pl.reactjs.org
1970-01-01 00:00:00.000
reactjs.org 2026-07-28 16:46:46.383
ta.reactjs.org
1970-01-01 00:00:00.000
uk.reactjs.org
1970-01-01 00:00:00.000
zh-hant.reactjs.org
1970-01-01 00:00:00.000

Tech Stack

Tech detection pending

Wappalyzer-rules detect CMS, frameworks, analytics, JS libs and server-side languages on this domain.

TLS Certificates

Certificate observations pending

TLS certs naming this domain in subject or SANs will appear here as our scan-layer catches them.

IPs Citing This Domain

Hosts whose HTML body references this domain. Strong signal for origin/mirror/embed discovery.

83.149.99.181:443 href · ×84
103.180.212.243:443 href · ×43
217.160.50.151:443 href · ×35
103.174.50.99:443 href · ×24
174.138.58.131:443 href · ×22
3.98.147.185:80 href · ×21
15.156.137.178:443 href · ×21
34.146.136.91:80 href · ×20
137.184.11.149:443 href · ×20
157.245.121.172:443 href · ×20
185.131.54.158:443 href · ×19
142.93.190.120:443 href · ×18
94.72.119.165:80 href · ×12
13.42.200.122:80 href · ×12
190.43.59.220:8081 href · ×12
203.113.135.158:443 href · ×12
167.86.102.145:80 href · ×12
38.242.132.24:80 href · ×12
203.113.135.158:80 href · ×12
94.72.119.165:443 href · ×12
103.212.70.58:443 href · ×11
61.0.248.14:443 href · ×9
3.74.11.239:80 href · ×8
173.62.120.199:443 href · ×6
193.70.1.174:443 href · ×6
45.148.29.112:443 href · ×6
18.218.37.250:80 href · ×5
63.183.2.180:443 href · ×5
3.131.176.24:80 href · ×5
18.217.28.208:80 href · ×5
87.106.25.11:443 href · ×5
188.225.86.159:80 href · ×5
112.124.40.173:443 href · ×4
165.227.153.181:80 href · ×4
129.153.62.192:443 href · ×4
68.183.96.196:80 href · ×4
13.94.225.14:80 href · ×4
195.201.133.196:443 href · ×4
45.55.104.89:443 href · ×4
47.100.188.46:443 href · ×3
34.36.209.210:443 href · ×3
3.111.86.6:80 href · ×3
159.195.84.156:80 href · ×2
161.189.222.161:80 href · ×2
3.94.138.92:443 href · ×2
159.195.84.151:80 href · ×2
152.53.119.116:80 href · ×2
159.69.6.174:443 href · ×2
35.193.36.135:80 href · ×2
44.199.122.155:80 href · ×2

Origin / IP-Leak

USP

When a hostname is served behind a CDN (e.g. Cloudflare), the origin server can sometimes be identified by matching its TLS cert against the protected hostname. Findings shown here are heuristic candidates, not guarantees.

No origin-IP leaks detected (yet)

Either this domain doesn't sit behind a CDN, or we haven't seen a TLS cert from a non-CDN IP matching this hostname. Run a fullscan to refresh the cert→IP cross-reference.

Threat Intelligence

Domain threat-intel pending

Matches in URLhaus, OpenPhish, PhishTank, malware feeds, and Spamhaus DBL.

History

Passive DNS — every value this name ever resolved to and when we first / last observed it. Updates every cycle of our forward-DNS crawler.

Type Value First seen Last seen
A 76.76.21.21 2026-05-25 22:07:29.493 2026-07-28 16:46:46.383
TXT google-site-verification=phixj4WdeUCjzqWQjOkCLkD8y6oeiJbqnCihojcYOWA 2026-05-25 22:07:29.493 2026-07-28 16:46:46.383
NS joan.ns.cloudflare.com 2026-05-25 22:07:29.493 2026-06-23 23:44:49.582
TXT v=spf1 include:spf.mandrillapp.com include:sparkpostmail.com ~all 2026-05-25 22:07:29.493 2026-07-28 16:46:46.383
TXT google-site-verification=8cSSWOK5msv3tzIFqXSvcb-KzSdG_E9g_H0bLIKhcWE 2026-05-25 22:07:29.493 2026-07-28 16:46:46.383
NS rohin.ns.cloudflare.com 2026-05-25 22:07:29.493 2026-06-23 23:44:49.582
CAA 0 issue "ssl.com" 2026-05-26 02:22:42.939 2026-07-28 16:46:46.383
CAA 0 issuewild "digicert.com; cansignhttpexchanges=yes" 2026-05-26 02:22:42.939 2026-07-28 16:46:46.383
CAA 0 issuewild "ssl.com" 2026-05-26 02:22:42.939 2026-07-28 16:46:46.383
CAA 0 issue "digicert.com; cansignhttpexchanges=yes" 2026-05-26 02:22:42.939 2026-07-28 16:46:46.383
CAA 0 issuewild "comodoca.com" 2026-05-26 02:22:42.939 2026-07-28 16:46:46.383
CAA 0 issuewild "letsencrypt.org" 2026-05-26 02:22:42.939 2026-07-28 16:46:46.383
CAA 0 issuewild "pki.goog; cansignhttpexchanges=yes" 2026-05-26 02:22:42.939 2026-07-28 16:46:46.383
CAA 0 issue "letsencrypt.org" 2026-05-26 02:22:42.939 2026-07-28 16:46:46.383
CAA 0 issue "comodoca.com" 2026-05-26 02:22:42.939 2026-07-28 16:46:46.383
CAA 0 issue "pki.goog; cansignhttpexchanges=yes" 2026-05-26 02:22:42.939 2026-07-28 16:46:46.383
NS junade.ns.cloudflare.com 2026-07-15 20:04:13.980 2026-07-28 16:46:46.383
NS hattie.ns.cloudflare.com 2026-07-15 20:04:13.980 2026-07-28 16:46:46.383