Check-Host.cc

Domain

cdn.optimizely.com

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

Run a live full scan of cdn.optimizely.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
A/AAAA targets
Subdomains
CT + scan + body
Record Types
seen in DNS
Observed Certs
in our scans

DNS Records

A
104.18.65.57, 104.18.66.57
AAAA
2606:4700::6812:4139, 2606:4700::6812:4239
MX
NS
erin.ns.cloudflare.com, lee.ns.cloudflare.com
TXT
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

Subdomain enumeration pending

Every subdomain ever issued a TLS cert under this apex — extracted from Certificate Transparency logs, our own scan observations and body references.

Tech Stack

Tech detection pending

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

TLS Certificates

Subject: cdn.optimizely.com
Issuer: DigiCert TLS RSA SHA256 2020 CA1
SANs: cdn.optimizely.com
Subject: cdn.optimizely.com
Issuer: DigiCert TLS RSA SHA256 2020 CA1
SANs: cdn.optimizely.com
Subject: *.cdn.optimizely.com
Issuer: DigiCert TLS RSA SHA256 2020 CA1
SANs: *.cdn.optimizely.com
Subject: cdn.optimizely.com
Issuer: DigiCert TLS RSA SHA256 2020 CA1
SANs: cdn.optimizely.com
Subject: *.cdn.optimizely.com
Issuer: GeoTrust RSA CA 2018
SANs: *.cdn.optimizely.com, cdn.optimizely.com
Subject: cdn.optimizely.com
Issuer: DigiCert TLS RSA SHA256 2020 CA1
SANs: cdn.optimizely.com
Subject: *.cdn.optimizely.com
Issuer: GeoTrust RSA CA 2018
SANs: *.cdn.optimizely.com, cdn.optimizely.com
Subject: *.cdn.optimizely.com
Issuer: DigiCert TLS RSA SHA256 2020 CA1
SANs: *.cdn.optimizely.com
Subject: *.cdn.optimizely.com
Issuer: DigiCert TLS RSA SHA256 2020 CA1
SANs: *.cdn.optimizely.com
Subject: *.cdn.optimizely.com
Issuer: DigiCert TLS RSA SHA256 2020 CA1
SANs: *.cdn.optimizely.com
Subject: *.cdn.optimizely.com
Issuer: GeoTrust RSA CA 2018
SANs: *.cdn.optimizely.com, cdn.optimizely.com
Subject: *.cdn.optimizely.com
Issuer: DigiCert TLS RSA SHA256 2020 CA1
SANs: *.cdn.optimizely.com
Subject: *.cdn.optimizely.com
Issuer: DigiCert TLS RSA SHA256 2020 CA1
SANs: *.cdn.optimizely.com
Subject: *.cdn.optimizely.com
Issuer: DigiCert TLS RSA SHA256 2020 CA1
SANs: *.cdn.optimizely.com
Subject: *.cdn.optimizely.com
Issuer: DigiCert TLS RSA SHA256 2020 CA1
SANs: *.cdn.optimizely.com
Subject: cdn.optimizely.com
Issuer: DigiCert TLS RSA SHA256 2020 CA1
SANs: cdn.optimizely.com
Subject: *.cdn.optimizely.com
Issuer: GeoTrust RSA CA 2018
SANs: *.cdn.optimizely.com, cdn.optimizely.com
Subject: *.cdn.optimizely.com
Issuer: GeoTrust RSA CA 2018
SANs: *.cdn.optimizely.com, cdn.optimizely.com
Subject: *.cdn.optimizely.com
Issuer: DigiCert TLS RSA SHA256 2020 CA1
SANs: *.cdn.optimizely.com
Subject: *.cdn.optimizely.com
Issuer: GeoTrust RSA CA 2018
SANs: *.cdn.optimizely.com, cdn.optimizely.com
Subject: *.cdn.optimizely.com
Issuer: DigiCert TLS RSA SHA256 2020 CA1
SANs: *.cdn.optimizely.com
Subject: *.cdn.optimizely.com
Issuer: DigiCert TLS RSA SHA256 2020 CA1
SANs: *.cdn.optimizely.com
Subject: cdn.optimizely.com
Issuer: DigiCert TLS RSA SHA256 2020 CA1
SANs: cdn.optimizely.com
Subject: *.cdn.optimizely.com
Issuer: GeoTrust RSA CA 2018
SANs: *.cdn.optimizely.com, cdn.optimizely.com
Subject: *.cdn.optimizely.com
Issuer: DigiCert TLS RSA SHA256 2020 CA1
SANs: *.cdn.optimizely.com
Subject: cdn.optimizely.com
Issuer: DigiCert TLS RSA SHA256 2020 CA1
SANs: cdn.optimizely.com
Subject: cdn.optimizely.com
Issuer: DigiCert TLS RSA SHA256 2020 CA1
SANs: cdn.optimizely.com
Subject: *.cdn.optimizely.com
Issuer: DigiCert TLS RSA SHA256 2020 CA1
SANs: *.cdn.optimizely.com
Subject: cdn.optimizely.com
Issuer: DigiCert TLS RSA SHA256 2020 CA1
SANs: cdn.optimizely.com
Subject: *.cdn.optimizely.com
Issuer: DigiCert TLS RSA SHA256 2020 CA1
SANs: *.cdn.optimizely.com

IPs Citing This Domain

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

34.31.121.131:443 href · ×4
34.172.154.131:443 href · ×4
107.178.211.69:443 href · ×4
52.203.76.58:80 href · ×3
100.23.116.51:80 href · ×3
198.199.75.240:80 href · ×3
134.213.239.86:80 href · ×3
13.237.68.242:443 href · ×2
95.131.48.150:443 href · ×2
169.47.218.50:443 href · ×2
18.199.227.96:80 href · ×2
34.41.124.189:443 href · ×2
35.226.82.203:443 href · ×2
13.54.224.166:443 href · ×2
13.89.100.141:443 href · ×2
3.212.232.221:443 href · ×2
34.232.131.123:443 href · ×2
209.99.185.148:80 href · ×2
63.184.83.138:80 href · ×2
83.141.6.10:443 href · ×2
45.9.150.242:443 href · ×2
32.196.238.37:443 href · ×2
52.207.167.167:443 href · ×2
54.153.84.135:80 href · ×2
34.171.155.1:443 href · ×2
158.177.114.222:443 href · ×2
63.182.69.88:80 href · ×2
3.131.50.141:443 href · ×2
35.224.136.14:443 href · ×2
34.136.41.161:443 href · ×2
120.77.174.111:80 href · ×2
3.216.114.173:443 href · ×2
13.223.141.39:443 href · ×2
34.209.197.167:80 href · ×1
16.176.88.253:443 href · ×1
13.193.231.26:80 href · ×1
151.244.184.120:443 href · ×1
130.17.1.209:80 href · ×1
213.189.27.84:443 href · ×1
103.121.207.37:443 href · ×1
44.240.20.72:443 href · ×1
178.128.51.11:443 href · ×1
54.251.40.69:443 href · ×1
34.120.139.121:443 href · ×1
54.164.198.246:443 href · ×1
151.244.184.174:443 href · ×1
35.73.41.197:80 href · ×1
52.32.133.10:443 href · ×1
149.210.143.9:443 href · ×1
201.14.210.253:443 href · ×1

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 104.18.66.57 2026-05-25 22:02:50.525 2026-07-28 18:45:26.399
AAAA 2606:4700::6812:4139 2026-05-25 22:02:50.525 2026-07-28 18:45:26.399
AAAA 2606:4700::6812:4239 2026-05-25 22:02:50.525 2026-07-28 18:45:26.399
A 104.18.65.57 2026-05-25 22:02:50.525 2026-07-28 18:45:26.399
NS erin.ns.cloudflare.com 2026-05-25 22:09:29.497 2026-07-28 18:45:26.399
NS lee.ns.cloudflare.com 2026-05-25 22:09:29.497 2026-07-28 18:45:26.399