Check-Host.cc

Domain

substack.com

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

Run a live full scan of substack.com

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
62
A/AAAA targets
Subdomains
984
CT + scan + body
Record Types
5
seen in DNS
Observed Certs
13
in our scans

DNS Records

A
104.18.37.200, 172.64.150.56
AAAA
2606:4700:4400::ac40:9638, 2606:4700:4401::ac40:9638, 2606:4700:4404::6812:25c8, 2606:4700:440b::6812:25c8
MX
10 mxa.mailgun.org, 10 mxb.mailgun.org
NS
ali.ns.cloudflare.com, lee.ns.cloudflare.com
TXT
facebook-domain-verification=8vbxp2ntmkudc6is3h5r840c9fwo7f, google-site-verification=4V_X38Yf0J4VJcWFwtG38bOS1nkOWeIWJhticlMgNQE, google-site-verification=DAkdykID6WqQM6tT7IfSu9_uB7-qIdB039MA_C3T3eA, google-site-verification=FfNIQIxsRHpj3Y7E_d3N6GFqGgWDZ-sfYojqCilwtqE, google-site-verification=SXEl7_p4SBszcanSWwVc_3-RFky80c0-94janbeeWI4, google-site-verification=vQEKLOUDfKNOQAv9W3EUMiRD6e5ibAEPhc2yCzP7big, tiktok-developers-site-verification=7PgqCAJ52ILLOqf2KELd8uaRfJpuzaLQ, tiktok-developers-site-verification=A9XRSo8lWy5CPFJ0bqI04KCpUZGAAq7p
CNAME
CAA

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
cdn.substack.com 2026-07-18 18:02:27.067
account.substack.com 2026-07-18 18:02:27.067
accounts.substack.com 2026-07-18 18:02:27.067
admin.substack.com 2026-07-18 18:02:27.067
administrator.substack.com 2026-07-18 18:02:27.067
aicentral.substack.com 2026-07-27 15:17:07.527
aidetox.substack.com 2026-06-20 21:49:21.644
aimaker.substack.com 2026-07-26 04:05:32.050
alertmanager.substack.com 2026-07-18 18:02:27.067
alpha.substack.com 2026-07-18 18:02:27.067
api-v1.substack.com 2026-07-18 18:02:27.067
api-v2.substack.com 2026-07-18 18:02:27.067
api.substack.com 2026-07-18 18:02:27.067
api1.substack.com 2026-07-18 18:02:27.067
api2.substack.com 2026-07-18 18:02:27.067
app.substack.com 2026-07-18 18:02:27.067
apps.substack.com 2026-07-18 18:02:27.067
archive.substack.com 2026-07-18 18:02:27.067
argocd.substack.com 2026-07-18 18:02:27.067
arkhaven.substack.com 2026-07-27 15:17:07.527
artifactory.substack.com 2026-07-18 18:02:27.067
assets.substack.com 2026-07-18 18:02:27.067
astralcodexten.substack.com 2026-07-17 08:28:39.270
auth.substack.com 2026-07-18 18:02:27.067
autoconfig.substack.com 2026-07-18 18:02:27.067
autodiscover.substack.com 2026-07-18 18:02:27.067
backup.substack.com 2026-07-18 18:02:27.067
backups.substack.com 2026-07-18 18:02:27.067
balancer.substack.com 2026-07-18 18:02:27.067
bamboo.substack.com 2026-07-18 18:02:27.067
bastion.substack.com 2026-07-18 18:02:27.067
beta.substack.com 2026-07-18 18:02:27.067
billing.substack.com 2026-07-18 18:02:27.067
bitbucket.substack.com 2026-07-18 18:02:27.067
bitsandatoms.substack.com 2026-07-16 17:42:25.951
bjt2n3904.substack.com 2026-07-26 03:31:29.946
blog.substack.com 2026-07-18 18:02:27.067
bounce.substack.com 2026-07-18 18:02:27.067
build.substack.com 2026-07-18 18:02:27.067
buy.substack.com 2026-07-18 18:02:27.067
cache.substack.com 2026-07-18 18:02:27.067
cacti.substack.com 2026-07-18 18:02:27.067
canary.substack.com 2026-07-18 18:02:27.067
cart.substack.com 2026-07-18 18:02:27.067
castalialibrary.substack.com 2026-07-27 15:17:07.527
cd.substack.com 2026-07-18 18:02:27.067
checkout.substack.com 2026-07-18 18:02:27.067
ci.substack.com 2026-07-18 18:02:27.067
circleci.substack.com 2026-07-18 18:02:27.067
community.substack.com 2026-07-18 18:02:27.067
confluence.substack.com 2026-07-18 18:02:27.067
console.substack.com 2026-07-27 03:05:22.074
control.substack.com 2026-07-18 18:02:27.067
corp.substack.com 2026-07-18 18:02:27.067
cp.substack.com 2026-07-18 18:02:27.067
cpanel.substack.com 2026-07-18 18:02:27.067
dashboard.substack.com 2026-07-18 18:02:27.067
database.substack.com 2026-07-18 18:02:27.067
datadog.substack.com 2026-07-18 18:02:27.067
davekarpf.substack.com 2026-07-23 02:03:34.131
db.substack.com 2026-07-18 18:02:27.067
demo.substack.com 2026-07-18 18:02:27.067
deploy.substack.com 2026-07-18 18:02:27.067
dev.substack.com 2026-07-18 18:02:27.067
develop.substack.com 2026-07-18 18:02:27.067
development.substack.com 2026-07-18 18:02:27.067
directadmin.substack.com 2026-07-18 18:02:27.067
dl.substack.com 2026-07-18 18:02:27.067
dns.substack.com 2026-07-18 18:02:27.067
dns1.substack.com 2026-07-18 18:02:27.067
dns2.substack.com 2026-07-18 18:02:27.067
docker.substack.com 2026-07-18 18:02:27.067
docs.substack.com 2026-07-18 18:02:27.067
documentation.substack.com 2026-07-18 18:02:27.067
downloads.substack.com 2026-07-18 18:02:27.067
edge.substack.com 2026-07-18 18:02:27.067
elastic.substack.com 2026-07-18 18:02:27.067
encrypt.substack.com 2026-07-18 18:02:27.067
es.substack.com 2026-07-18 18:02:27.067
events.substack.com 2026-07-18 18:02:27.067
exchange.substack.com 2026-07-18 18:02:27.067
fandompulse.substack.com 2026-07-27 15:17:07.527
files.substack.com 2026-07-18 18:02:27.067
firewall.substack.com 2026-07-18 18:02:27.067
fleawar.substack.com 2026-06-23 03:58:47.751
forum.substack.com 2026-07-18 18:02:27.067
ftp.substack.com 2026-07-18 18:02:27.067
fw.substack.com 2026-07-18 18:02:27.067
gamithra.substack.com 2026-07-21 05:35:48.278
gateway.substack.com 2026-07-18 18:02:27.067
gatewaze.substack.com 2026-07-26 06:49:47.584
git.substack.com 2026-07-18 18:02:27.067
gitea.substack.com 2026-07-18 18:02:27.067
github.substack.com 2026-07-18 18:02:27.067
gitlab.substack.com 2026-07-18 18:02:27.067
givealltheheart.substack.com 2026-06-20 20:35:02.791
grafana.substack.com 2026-07-18 18:02:27.067
graphite.substack.com 2026-07-18 18:02:27.067
graphql.substack.com 2026-07-18 18:02:27.067
grocto.substack.com 2026-07-17 05:00:49.128
grpc.substack.com 2026-07-18 18:02:27.067
gw.substack.com 2026-07-18 18:02:27.067
harbor.substack.com 2026-07-18 18:02:27.067
heathercoxrichardson.substack.com 2026-07-17 02:27:17.666
help.substack.com 2026-07-18 18:02:27.067
home.substack.com 2026-07-18 18:02:27.067
hypatiaai.substack.com 2026-07-19 01:17:10.890
icinga.substack.com 2026-07-18 18:02:27.067
id.substack.com 2026-07-18 18:02:27.067
idp.substack.com 2026-07-18 18:02:27.067
images.substack.com 2026-07-18 18:02:27.067
imap.substack.com 2026-07-18 18:02:27.067
imap2.substack.com 2026-07-18 18:02:27.067
img.substack.com 2026-07-18 18:02:27.067
internal.substack.com 2026-07-18 18:02:27.067
intranet.substack.com 2026-07-18 18:02:27.067
invoice.substack.com 2026-07-18 18:02:27.067
janahan.substack.com 2026-07-21 11:11:58.401
jenkins.substack.com 2026-07-18 18:02:27.067
jira.substack.com 2026-07-18 18:02:27.067

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

Domain timeline pending

Passive-DNS history accumulates as our forward-DNS crawler observes A/AAAA/MX/NS/TXT records over time.