How do you find subdomains for openai.com?

We utilize passive Open Source Intelligence (OSINT) techniques, primarily querying Certificate Transparency (CT) logs, search engine indexes, and public DNS datasets to locate subdomains without actively brute-forcing the target servers.

What is a Subdomain Takeover on openai.com?

A takeover occurs when a subdomain of openai.com has a DNS record pointing to a decommissioned third-party service (like an expired AWS S3 bucket). An unauthorized actor can claim that bucket and serve malicious content on the legitimate subdomain.

Why are there hidden subdomains on openai.com?

Large organizations frequently spin up temporary subdomains for development ('dev.openai.com'), testing ('staging.openai.com'), or third-party integrations ('help.openai.com'). These are often forgotten and left unpatched, creating a shadow IT risk.

Internet-Facing Assets Mapping

openai.com Subdomains & External Footprint

Passive infrastructure intelligence and host audit report for openai.com. Access active subdomains, DNS records, TLS health, and attack surface risk evaluations.

Attack Surface Score

28/100

Medium Exposure

Tracked Subdomains

154hosts

Aggregated from CT Logs & DNS

Primary Cloud/Host

Cloudflare

takeovers: None Detected

Active Subdomain Mapping Table

Resolved subdomains discovered via passive certificate log parsing. These subdomains route directly to the core assets of openai.com.

Hostname	Resolved IP Address	HTTP Status	Asset Classification	Network Operator
www.openai.com	104.18.3.111	200 OK	Production	Cloudflare
api.openai.com	104.18.2.111	401 Unauthorized	REST API	Cloudflare
dev.openai.com	104.18.4.111	403 Forbidden	Development	Cloudflare
chat.openai.com	104.18.2.100	200 OK	Chat Application	Cloudflare
status.openai.com	104.18.15.54	200 OK	Operations	Cloudflare

Authoritative DNS Zone Profile

DNS record configurations retrieved for the parent domain and primary sub-environments.

// Address (A) Records

openai.comIN A104.18.3.111

www.openai.comIN A104.18.3.111

// Mail Exchange (MX) Records

openai.comIN MX 1aspmx.l.google.com

openai.comIN MX 5alt1.aspmx.l.google.com

// Text (TXT) Metadata Records

openai.comIN TXTv=spf1 include:spf.protection.outlook.com include:_spf.google.com include:mailgun.org ~all

openai.comIN TXTopenai-domain-verification=open82a...

// Nameserver (NS) Authorities

openai.comIN NScurt.ns.cloudflare.com

openai.comIN NSglenda.ns.cloudflare.com

Cryptographic SSL/TLS Audit

Validates certificate authorities, cipher suites, expiration timeframes, and security configurations.

Certificate Authority (Issuer)Cloudflare Inc ECC CA-3

Active Cipher SuiteTLS_AES_128_GCM_SHA256

Key Size & TypeECDSA 256 bits

TLS Protocol Version SupportTLS 1.2, TLS 1.3

Validity Period2026-02-10 to 2027-02-10

Web SSL Security GradeA+

Key Security Observations

Diagnostic analysis of public configurations, mail security rules, and DNS hijack protection for openai.com.

DNSSEC Validation: Authoritative DNSSEC validation is successfully enabled. Prevents cache poisoning.
DMARC Compliance: DMARC policy configured: Reject (p=reject). Helps prevent spoofing attacks.
Sender Policy Framework (SPF): Valid policy (include:spf.protection.outlook.com). Authorized mail servers explicitly listed.
CNAME Takeover Vulnerabilities: No dangling CNAME records pointing to decommissioned hosts detected.

Audit Subdomain Vulnerabilities in Real Time

Run a real-time deep scan on the ReconShield live engine to query latest Certificate Transparency registries, active HTTP ports, and service headers for openai.com.

Scan openai.com Now