Check-Host.cc

Try 1.1.1.1 AS13335 check-host.cc /country/de /tld/cc
Domain

go.dev

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

DNS Check HTTP Check Run Full Scan .dev TLD

Run a live full scan of go.dev

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
30
A/AAAA targets
Subdomains
34
CT + scan + body
Record Types
6
seen in DNS
Observed Certs
3
in our scans

DNS Records

A
216.239.32.21, 216.239.34.21, 216.239.36.21, 216.239.38.21
AAAA
2001:4860:4802:32::15, 2001:4860:4802:34::15, 2001:4860:4802:36::15, 2001:4860:4802:38::15
MX
1 aspmx.l.google.com, 10 alt3.aspmx.l.google.com, 10 alt4.aspmx.l.google.com, 5 alt1.aspmx.l.google.com, 5 alt2.aspmx.l.google.com
NS
ns-cloud-e1.googledomains.com, ns-cloud-e2.googledomains.com, ns-cloud-e3.googledomains.com, ns-cloud-e4.googledomains.com
TXT
google-site-verification=3oHHTSOKrjE9J8SIvyj3gUxEtDjmr5oNZ-DbB271vpM, google-site-verification=eYE-BIP9BY8VZCUI_r8sJi7qjRVtxyRQSlbZmeVVlzE, google-site-verification=eqtrduRyMRS8TuoUEuYMF-u9_IDRMd1In6T6E1gTchU, google-site-verification=mJdpiJi2GyNG9nz7sctCXgJnzDHzdFzfhOqTTDuMR0s, google-site-verification=qvibgBDBD_1VeFXvgduqw1cmDeMpAS_qBCZCFauYduk
CNAME
—
CAA
0 issue "letsencrypt.org", 0 issue "pki.goog"

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
learn.go.dev
142.251.209.243 2a00:1450:4001:c17::79 192.178.183.121 74.125.71.121 +10
2026-07-23 17:01:04.707
go.dev
216.239.36.21 2001:4860:4802:34::15 2001:4860:4802:36::15 2001:4860:4802:32::15 +4
2026-07-28 20:14:18.483
pkg.go.dev
34.149.140.181 2600:1901:0:f535::
2026-07-28 19:02:52.609
play.go.dev
142.251.110.121 2a00:1450:4025:402::79
2026-06-23 09:11:22.952
staging-pkg.go.dev
34.117.157.246 2600:1901:0:cc39::
2026-07-26 07:27:11.595
dev-pkg.go.dev
1970-01-01 00:00:00.000
dev-worker.go.dev
35.186.245.16
2026-07-19 15:44:49.207
prod-worker.go.dev
34.120.249.233
2026-07-21 13:46:25.471
staging-worker.go.dev
1970-01-01 00:00:00.000
telemetry.go.dev
1970-01-01 00:00:00.000
vuln.go.dev
34.117.213.18
2026-06-19 18:55:17.262

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

No citing IPs found yet

As the world-sweep progresses, hosts referencing this domain in their HTML will surface here.

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 216.239.36.21 2026-05-25 21:56:50.553 2026-07-28 20:14:18.483
A 216.239.34.21 2026-05-25 21:56:50.553 2026-07-28 20:14:18.483
AAAA 2001:4860:4802:38::15 2026-05-25 21:56:50.553 2026-07-28 20:14:18.483
AAAA 2001:4860:4802:36::15 2026-05-25 21:56:50.553 2026-07-28 20:14:18.483
A 216.239.38.21 2026-05-25 21:56:50.553 2026-07-28 20:14:18.483
AAAA 2001:4860:4802:32::15 2026-05-25 21:56:50.553 2026-07-28 20:14:18.483
A 216.239.32.21 2026-05-25 21:56:50.553 2026-07-28 20:14:18.483
AAAA 2001:4860:4802:34::15 2026-05-25 21:56:50.553 2026-07-28 20:14:18.483
MX 5 alt2.aspmx.l.google.com 2026-05-26 00:03:35.658 2026-07-28 20:14:18.483
NS ns-cloud-e4.googledomains.com 2026-05-26 00:03:35.658 2026-07-28 20:14:18.483
NS ns-cloud-e1.googledomains.com 2026-05-26 00:03:35.658 2026-07-28 20:14:18.483
CAA 0 issue "pki.goog" 2026-05-26 00:03:35.658 2026-07-28 20:14:18.483
TXT google-site-verification=3oHHTSOKrjE9J8SIvyj3gUxEtDjmr5oNZ-DbB271vpM 2026-05-26 00:03:35.658 2026-07-28 20:14:18.483
MX 10 alt4.aspmx.l.google.com 2026-05-26 00:03:35.658 2026-07-28 20:14:18.483
MX 1 aspmx.l.google.com 2026-05-26 00:03:35.658 2026-07-28 20:14:18.483
TXT google-site-verification=qvibgBDBD_1VeFXvgduqw1cmDeMpAS_qBCZCFauYduk 2026-05-26 00:03:35.658 2026-07-28 20:14:18.483
MX 5 alt1.aspmx.l.google.com 2026-05-26 00:03:35.658 2026-07-28 20:14:18.483
NS ns-cloud-e2.googledomains.com 2026-05-26 00:03:35.658 2026-07-28 20:14:18.483
TXT google-site-verification=eqtrduRyMRS8TuoUEuYMF-u9_IDRMd1In6T6E1gTchU 2026-05-26 00:03:35.658 2026-07-28 20:14:18.483
MX 10 alt3.aspmx.l.google.com 2026-05-26 00:03:35.658 2026-07-28 20:14:18.483
NS ns-cloud-e3.googledomains.com 2026-05-26 00:03:35.658 2026-07-28 20:14:18.483
CAA 0 issue "letsencrypt.org" 2026-05-26 00:03:35.658 2026-07-28 20:14:18.483
TXT google-site-verification=mJdpiJi2GyNG9nz7sctCXgJnzDHzdFzfhOqTTDuMR0s 2026-05-26 00:03:35.658 2026-07-28 20:14:18.483
TXT google-site-verification=eYE-BIP9BY8VZCUI_r8sJi7qjRVtxyRQSlbZmeVVlzE 2026-05-26 00:03:35.658 2026-07-28 20:14:18.483