The domain app.readthedocs.org is registered with an undisclosed registrar. It resolves to IP address 104.18.6.29, hosted by Cloudflare, Inc.. Email delivery is handled by No MX Records Found. No valid SPF record was detected. DMARC protection is missing or unconfigured. Web traffic is secured with an SSL certificate issued by WE1.
Domain Overview: app.readthedocs.org
Expires in N/A ยท DNSSEC: Unsigned
No MX Records Found
Issuer: WE1 (2 SANs)
Toronto, Ontario, Canada (CA)
๐ Domain & Registration Identity View Full Whois Details โ
| Domain | app.readthedocs.org |
|---|---|
| Website Title | |
| Registered | N/A |
| Expires | N/A |
| Remaining Validity | N/A |
| Domain Age | N/A |
| Registrar | N/A |
| Domain Status | N/A |
| DNSSEC Delegation | Unsigned ยท Zone not signed with DNSSEC keys |
| Authoritative Nameservers | N/A |
๐ก๏ธ Email Security & Deliverability (SPF, DKIM, DMARC) View Complete Email Security Diagnostics โ
| Detected Email Provider | ๐ฌ No MX Records Found |
|---|---|
| Primary Mail Server (MX) |
None
|
| SPF Record (Sender Policy) | Missing |
| DKIM Authentication | Not Detected ยท (No common third-party selector found; custom keys may be configured) |
| DMARC Policy | Missing |
| SMTP Port 25 Status | N/A ยท Inbound mail server handshake response |
๐ฅ๏ธ Web Server, Hosting & Network View Full Server & Tech Details โ
| Web Server Software | cloudflare |
|---|---|
| HTTP Status Code | 200 |
| Server IP (IPv4) | 104.18.6.29 View Geo Details โ |
| IPv6 Address (AAAA) | 2606:4700::6812:71d |
| Reverse DNS (PTR) |
None Detected (No PTR Record)
|
| Server Location | ๐ Toronto, Ontario, Canada (CA) |
| ASN Network & ISP | AS13335 (Cloudflare, Inc.) |
| Hosting Provider | Cloudflare, Inc. |
| Control Panel | Not Detected |
| Technology Stack | Cloudflare Font Awesome |
| HTTP Security Headers | 5 / 6 Active (HSTS, CSP, X-Frame, X-Content, Referrer-Policy) Audit Details โ |
| DNSBL Blacklist Reputation | Clean (0/5 lists) |
๐ SSL/TLS Certificate Summary View Full SSL Certificate & Chain โ
| Primary Hostname (CN) | readthedocs.org ยท Multi-Domain SAN (Covers 2 hostnames) |
|---|---|
| SSL Issuer | WE1 |
| SSL Valid Till | 2026-11-14 |
| Remaining Validity | 47 Days |
| Chain Status | Valid Trusted Chain |
| Signature Algorithm | ecdsa-with-SHA256 |
Whois Ownership & Registration for app.readthedocs.org
๐ View Raw Registry Response โDomain Information
| Domain Name | N/A |
Registrar Information
| Name | N/A |
Registrant Contact
Contact information for this role is not provided by the registry.
Administrative Contact
Contact information for this role is not provided by the registry.
Technical Contact
Contact information for this role is not provided by the registry.
Nameservers
๐ View Raw Registry Response RDAP (Hybrid)
{
"rdapConformance": [
"rdap_level_0",
"icann_rdap_response_profile_1",
"icann_rdap_technical_implementation_guide_1"
],
"notices": [
{
"title": "Terms of Service",
"description": [
"Public Interest Registry provides this RDAP service for informational purposes only, and to assist persons in obtaining information about or related to a domain name registration record. Public Interest Registry does not guarantee its accuracy. Users accessing the Public Interest Registry RDAP service agree to use the data only for lawful purposes, and under no circumstances may this data be used to: a) allow, enable, or otherwise support the transmission by e-mail, telephone, or facsimile of mass unsolicited, commercial advertising or solicitations to entities other than the registrar's own existing customers and b) enable high volume, automated, electronic processes that send queries or data to the systems of Public Interest Registry or any ICANN-accredited registrar, except as reasonably necessary to register domain names or modify existing registrations. When using the Public Interest Registry RDAP service, please consider the following: the RDAP service is not a replacement for standard EPP commands to the SRS service. RDAP is not considered authoritative for registered domain objects. The RDAP service may be scheduled for downtime during production or OT&E maintenance periods. Queries to the RDAP services are throttled. If too many queries are received from a single IP address within a specified time, the service will begin to reject further queries for a period of time to prevent disruption of RDAP service access. Abuse of the RDAP system through data mining is mitigated by detecting and limiting bulk query access from single sources. Where applicable, the presence of a [Non-Public Data] tag indicates that such data is not made publicly available due to applicable data privacy laws or requirements. Should you wish to contact the registrant, please refer to the RDAP records available through the registrar URL listed above. Access to non-public data may be provided, upon request, where it can be reasonably confirmed that the requester holds a specific legitimate interest and a proper legal basis for accessing the withheld data. Access to this data can be requested by submitting a request to WHOISrequest@pir.org. Public Interest Registry Inc. reserves the right to modify these terms at any time. By submitting this query, you agree to abide by this policy."
],
"links": [
{
"value": "https://rdap.publicinterestregistry.org/rdap/domain/app.readthedocs.org",
"rel": "terms-of-service",
"href": "https://thenew.org/org-people/about-pir/policies/",
"type": "text/html"
}
]
}
],
"errorCode": 400,
"title": "Bad Request",
"description": [
"Bad Request"
],
"lang": "en"
}
DNS Records for app.readthedocs.org
NS Records
No NS records found.
A Records
| Name | Data | Copy |
|---|---|---|
| app.readthedocs.org. | 104.18.6.29 |
|
| app.readthedocs.org. | 104.18.7.29 |
AAAA Records
| Name | Data | Copy |
|---|---|---|
| app.readthedocs.org. | 2606:4700::6812:71d |
|
| app.readthedocs.org. | 2606:4700::6812:61d |
WWW Records (www.app.readthedocs.org)
No CNAME or A records found for the 'www' subdomain.
MX Records
No MX records found.
TXT Records
No TXT records found.
Email Security (MX, SPF, DKIM, DMARC, SMTP) for app.readthedocs.org
Mail Exchange (MX) Routing Records
Warning: No MX records were found for app.readthedocs.org. This domain cannot receive emails.
SPF Record Validation
No SPF record found to validate.
Common DKIM Selectors
No common third-party DKIM selectors found. Custom selectors may be configured.
๐ Query Custom DKIM Selector
Live DNS Lookup
Using a custom or date-based selector (e.g. crm, newsletter, 2024)? Query its public key live on app.readthedocs.org:
DMARC Policy Validation
No DMARC record found to validate.
Validation Summary
| DMARC Record Published | Fail No DMARC record was found. |
Optimization Suggestions
A DMARC record is essential for email security. It tells receiving servers what to do with emails that fail SPF and DKIM checks, protecting your domain from spoofing.
Server IP Blacklist Check (104.18.6.29)
SSL/TLS Certificate Details for app.readthedocs.org
- Issuer: WE1
- Expires In: 47 Days
- Chain Status: Valid Chain
Main Leaf Certificate
- Common Name:
readthedocs.org - SANs: DNS:readthedocs.org, DNS:*.readthedocs.org
- Organization: N/A
- Validity: Aug 15, 2026 to Nov 14, 2026
- Algorithm: ecdsa-with-SHA256
- Common Name: WE1
- Organization: Google Trust Services
- Valid Till: Feb 20, 2029
- Issuer: GTS Root R4
- Common Name: GTS Root R4
- Organization: Google Trust Services LLC
- Valid Till: Jan 28, 2028
- Issuer: GlobalSign Root CA
Website & Server Intelligence for app.readthedocs.org
Website Identity
| Title | |
|---|---|
| Meta Description | N/A |
Hosting & Server Network
| IP Address | 104.18.6.29 |
|---|---|
| HTTP Status | 200 |
| Hosting Provider | Cloudflare, Inc. |
| Web Server | cloudflare |
| Control Panel | Not Detected |
Technology Profile
- Cloudflare
- Font Awesome
HTTP Security Headers
| Strict-Transport-Security | Present |
| Content-Security-Policy | Present |
| X-Frame-Options | Present |
| X-Content-Type-Options | Present |
| Referrer-Policy | Present |
| Permissions-Policy | Missing |
IP Details & Geolocation
| IP Address | 104.18.6.29 |
|---|---|
| Reverse DNS (PTR) |
None Detected (No PTR Record)
|
| Country | Canada (CA) |
| Region | Ontario |
| City | Toronto |
| ZIP Code | N/A |
| ASN | 13335 |
| Organization / ISP | Cloudflare, Inc. |
Understanding Diagnostic Terms for app.readthedocs.org
Domain Status (EPP)
EPP status codes (e.g., clientTransferProhibited, active) indicating if a domain is locked against unauthorized transfer, pending renewal, or active.
Registrar Information
The authorized or accredited organization managing the domain reservation and authoritative registry delegation.
Nameservers (NS)
Authoritative servers that translate domain names into IP addresses and direct web visitors and mail traffic globally.
A & AAAA Records
Primary address records mapping your domain name directly to standard IPv4 (e.g., 192.0.2.1) and newer IPv6 server network addresses.
MX (Mail Exchange)
Priority-ranked records pointing inbound emails to designated mail server hosts (e.g., Google Workspace, Microsoft 365, Zoho).
SPF & DMARC Security
Email authentication standards that verify authorized sender IPs (SPF) and instruct receiving servers how to enforce security policies (DMARC).
DKIM Signatures
Cryptographic public key in DNS used by receiving mail servers to verify digital signatures on your emails, ensuring messages were not tampered with.
SSL Certificate & Chain
Establishes encrypted HTTPS connections and authenticates domain ownership via an intermediate certificate authority chain.
Hosting Provider & ASN
The physical server infrastructure where website files reside and the autonomous system network (ASN) routing global traffic.
Reverse DNS (PTR)
Pointer (PTR) records that map a server's IP address back to its canonical hostname, verifying server identity and preventing email spam rejection.
HTTP Security Headers
Directives like HSTS, CSP, and X-Frame-Options instructed by the server to protect browser visitors against XSS, clickjacking, and packet sniffing.
โ ๏ธ Report Limitations & Data Sources
- Data Currency: This report uses cached registry and DNS data (freshened within 4 hours) for high-speed resolution. Click "๐ Refresh Live" to query directly against authoritative registries.
- DNS Resolution & Propagation: Records are queried via Google Public DNS-over-HTTPS. Global DNS propagation may take up to 24โ48 hours across different regional ISP resolvers during recent DNS record changes.
- Completeness & Scope: This diagnostic tool analyzes standard authoritative records (A, AAAA, MX, NS, TXT, CNAME, SOA). It does not perform invasive brute-force subdomain scans or unauthenticated DNS zone transfers.
- Email Deliverability & Reputation: The security analysis (SPF, DKIM, DMARC, and Port 25 SMTP handshake) reflects public DNS policies and inbound connection states. Recipient spam filters evaluate internal headers that cannot be checked from outside.
- Reverse Proxies & CDNs: If a website is behind Cloudflare, Fastly, or another CDN/reverse proxy, the detected IP, web server software, and SSL edge certificate reflect the proxy tier.