Summary
- Registrar
- Gandi SAS
- Status
- clientTransferProhibited
- Created on
- March 14, 2013
- Expires on
- March 14, 2027
- Name servers
- tegan.ns.cloudflare.com, rocky.ns.cloudflare.com
- Mail servers
- in1-smtp.messagingengine.com, in2-smtp.messagingengine.com
- SPF
- Neutral
- DKIM
- 3 keys found
- Website
- See the website
Authorized senders (SPF)
The record gives no instruction for other servers.
SPF lists the servers allowed to send e-mails for overcast.fm.
| Rule | Value | Result |
|---|---|---|
| include | spf.messagingengine.com | Allowed |
| all | — | Neutral |
Top-level DNS lookups: 1 of 10 allowed
Record
v=spf1 include:spf.messagingengine.com ?all
E-mail signing (DKIM)
DKIM keys published by overcast.fm under the most common selectors. Other keys may exist under selectors specific to each sending service.
| Selector | Likely service | Key | Status |
|---|---|---|---|
| fm1 | Fastmail | RSA | Revoked |
| fm2 | Fastmail | RSA 2048 bits | Active |
| fm3 | Fastmail | RSA | Revoked |
MX, SPF, DKIM and DMARC: the e-mail records
Four DNS records make a domain's e-mail work. MX says where e-mails sent to overcast.fm arrive; SPF, DKIM and DMARC let mail servers check that an e-mail claiming to come from overcast.fm was really sent by this domain, which protects it against spoofing.
MX
An MX (Mail Exchanger) record designates a server that receives e-mails sent to the domain. When someone writes to an @overcast.fm address, their mail server queries the DNS for the domain's MX records, then delivers the message to the server they point to.
Example record
overcast.fm MX 10 mx1.overcast.fm. overcast.fm MX 20 mx2.overcast.fm.
What the record contains
- 10, 20
- Priority: the server with the lowest number is tried first. Servers with equal priority share the load.
- mx1.overcast.fm.
- Host name of the mail server. It must point to an A or AAAA record: an IP address or an alias (CNAME) is not allowed here.
- 0 .
- An MX "0 .", called a null MX, declares that the domain accepts no e-mail: sending servers give up at once instead of retrying.
Declaring at least two servers with different priorities avoids losing e-mails during an outage: sending servers retry for several days and fall back on the backup server. Without any MX, they try to deliver directly to the IP address of the domain.
SPF
SPF (Sender Policy Framework) is a TXT record listing the servers allowed to send e-mails on behalf of the domain. The receiving server checks that the sender is on this list. The final "all" rule says what to do with other servers: reject them (-all), flag their e-mails as suspicious (~all) or make no decision (?all).
Example record
overcast.fm TXT "v=spf1 mx include:_spf.google.com ip4:192.0.2.10 -all"
What the record contains
- v=spf1
- Identifies the record as an SPF policy. It must come first.
- ip4, ip6
- Allows a specific IP address or an address range, for example ip4:192.0.2.0/24.
- a, mx
- Allows the addresses of the domain itself (A record) or those of its mail servers (MX).
- include
- Allows the servers of another domain, usually a sending service: include:_spf.google.com for Google Workspace.
- -all, ~all
- Final rule, applied to every other server. Its qualifier decides what happens to them: - rejects them, ~ flags their e-mails as suspicious, ? makes no decision, + accepts them (avoid it).
A domain must publish only one SPF record, and its evaluation cannot exceed 10 DNS lookups (include, a, mx, exists, redirect). Beyond that, mail servers treat it as invalid.
DKIM
DKIM (DomainKeys Identified Mail) signs every outgoing e-mail with a private key. The matching public key is published in a TXT record at selector._domainkey.overcast.fm, so the recipient can check that the message really comes from the domain and was not altered on the way. The selector is chosen by each sending service and cannot be guessed: Dataweaz checks the most common ones (Google Workspace, Microsoft 365, Mailchimp, SendGrid…), so a key published under another selector may exist without appearing here.
Example record
google._domainkey.overcast.fm TXT "v=DKIM1; k=rsa; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA…"
What the record contains
- v=DKIM1
- Protocol version. Optional but recommended, in which case it must come first.
- k
- Key algorithm: rsa, the most common, or ed25519.
- p
- Public key, base64-encoded. An empty value means the key has been revoked.
- t
- Flags: y marks a key in testing, whose failures must not be penalized; s forbids its use for subdomains.
Each sending service publishes its key under its own selector (google, selector1, k1…), which allows several keys and seamless rotation. A 2048-bit RSA key is recommended today.
DMARC
DMARC (Domain-based Message Authentication, Reporting and Conformance) builds on SPF and DKIM. Published on _dmarc.overcast.fm, it tells mail servers what to do with an e-mail that fails these checks (let it through, send it to spam or reject it) and where to send reports.
Example record
_dmarc.overcast.fm TXT "v=DMARC1; p=quarantine; rua=mailto:[email protected]; adkim=r; aspf=r"
What the record contains
- v=DMARC1
- Identifies the record as a DMARC policy. It must come first.
- p
- Policy applied to e-mails that fail the checks: none (monitoring only), quarantine (spam folder) or reject.
- sp
- Subdomain policy. Without it, subdomains follow the domain's policy.
- rua
- Address that receives daily aggregate reports about e-mails sent on behalf of the domain, whether they pass the checks or not.
- ruf
- Address that receives detailed failure reports, message by message. Few providers still send them.
- pct
- Percentage of e-mails subject to the policy, for a gradual rollout. 100 by default.
- adkim, aspf
- DKIM and SPF alignment: r (relaxed, a subdomain of the same domain is enough) or s (strict, the domain must be identical).
To roll out DMARC without blocking legitimate e-mails, start with p=none and an rua address, analyze the reports to find every service sending on behalf of the domain, then move to quarantine and finally to reject.
DNS records of overcast.fm
IP addresses (A and AAAA)
An A record maps the domain name to an IPv4 address: the address of the server that browsers contact to display the website. The AAAA record does the same for an IPv6 address. A domain can have several of them to spread visits across several servers.
| Type | IP address |
|---|---|
| A | 45.33.1.40 |
| A | 45.56.67.224 |
Name servers (NS)
NS records designate the authoritative DNS servers of the domain: they answer every question about its other records (A, MX, TXT…). They are provided by the registrar, the hosting provider or a dedicated DNS service, and several servers are declared so that the domain keeps working if one of them fails.
| Server | IP address |
|---|---|
| tegan.ns.cloudflare.com | 172.64.32.226 |
| rocky.ns.cloudflare.com | 173.245.59.227 |
Mail servers (MX)
MX records point to the servers that receive e-mails sent to the domain, that is to @overcast.fm addresses. Each server has a priority: the one with the lowest number is tried first, the others take over if it fails. Without an MX record, the domain cannot receive e-mails.
| Priority | Server | IP address |
|---|---|---|
| 10 | in1-smtp.messagingengine.com | 103.168.172.220 |
| 20 | in2-smtp.messagingengine.com | 202.12.124.219 |
TXT records
TXT records hold free text. They are used to prove ownership of the domain to online services (Google, Microsoft, Facebook…) and to publish e-mail security rules: SPF on the domain itself, DMARC on _dmarc.overcast.fm.
| Name | Content |
|---|---|
| overcast.fm | apple-domain-verification=RVG8mJwNCKZ8sqDT |
| overcast.fm | v=spf1 include:spf.messagingengine.com ?all |
| fm1._domainkey.overcast.fm | v=DKIM1; k=rsa; n=Intentionally_Left_Blank_As_Per_DKIM_Rotation_BCP; p= |
| fm2._domainkey.overcast.fm | v=DKIM1; k=rsa; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAvWT5Pb6oKsGc6JNX5fV6UW1BlTHBnsRV4Pzkw6855ORFjB2iUTxAmXEzuxsXSAFuZ7/6XJZRFVuEB8wSBfQnV+80NlAQin49Uh3xF/sO1UxKQhImxIgH35mgba2QLKoEFj+sGCaIhYpTx3FeutOjUdrEy73BMzjtsCqoF2gqQOeluLEuQibA/d4reyGm/ml1RcEJ9u1X1p5vQhkSuTnBqmE4+6ZXmpDXpz7hpm+yXV3tNsddJAVL/TPmbJetvs/Rsj4sfKCNYVQWlo9oU9Uha1GMOs0UFoBKKGVJG7fo8L0hisnxpV9rHKAb5TF34dP0TB4K7kme9fnz2ybrcPjLqwIDAQAB |
| fm3._domainkey.overcast.fm | v=DKIM1; k=rsa; n=Intentionally_Left_Blank_As_Per_DKIM_Rotation_BCP; p= |
Related IP addresses
IPv4 addresses used by overcast.fm: website, name servers, mail servers and senders authorized by SPF.
| IP address | Used for | /24 block |
|---|---|---|
| 45.33.1.40 | Website | 45.33.1.0/24 |
| 45.56.67.224 | Website | 45.56.67.0/24 |
| 172.64.32.226 | Name server tegan.ns.cloudflare.com | 172.64.32.0/24 |
| 173.245.59.227 | Name server rocky.ns.cloudflare.com | 173.245.59.0/24 |
| 103.168.172.220 | Mail server in1-smtp.messagingengine.com | 103.168.172.0/24 |
| 202.12.124.219 | Mail server in2-smtp.messagingengine.com | 202.12.124.0/24 |
WHOIS of the domain overcast.fm
Domain Name: OVERCAST.FM Registry Domain ID: D34895004-CNIC Registrar WHOIS Server: whois.gandi.net Registrar URL: http://www.gandi.net/ Updated Date: 2026-04-13T09:28:58.0Z Creation Date: 2013-03-13T23:59:59.0Z Registry Expiry Date: 2027-03-13T23:59:59.0Z Registrar: Gandi SAS Registrar IANA ID: 81 Domain Status: clientTransferProhibited https://icann.org/epp#clientTransferProhibited Registrant Email: https://whois.nic.fm/contact/overcast.fm/registrant Tech Email: https://whois.nic.fm/contact/overcast.fm/tech Name Server: ROCKY.NS.CLOUDFLARE.COM Name Server: TEGAN.NS.CLOUDFLARE.COM DNSSEC: unsigned Registrar Abuse Contact Email: [email protected] Registrar Abuse Contact Phone: +33.170377661 URL of the ICANN Whois Inaccuracy Complaint Form: https://www.icann.org/wicf/ >>> Last update of WHOIS database: 2026-10-01T18:22:43.0Z <<< For more information on Whois status codes, please visit https://icann.org/epp The registration data available in this service is limited. Additional data may be available at https://lookup.icann.org The Whois and RDAP services are provided by CentralNic, and contain information pertaining to Internet domain names registered by our our customers. By using this service you are agreeing (1) not to use any information presented here for any purpose other than determining ownership of domain names, (2) not to store or reproduce this data in any way, (3) not to use any high-volume, automated, electronic processes to obtain data from this service. Abuse of this service is monitored and actions in contravention of these terms will result in being permanently blacklisted. All data is (c) CentralNic Ltd (https://www.centralnicregistry.com) Access to the Whois and RDAP services is rate limited. For more information, visit https://centralnicregistry.com/policies/whois-guidance. Domain Name: overcast.fm Registry Domain ID: D34895004-CNIC Registrar WHOIS Server: whois.gandi.net Registrar URL: http://www.gandi.net Updated Date: 2026-04-13T09:28:58Z Creation Date: 2013-03-13T21:19:01Z Registrar Registration Expiration Date: 2027-03-13T23:59:59Z Registrar: GANDI SAS Registrar IANA ID: 81 Registrar Abuse Contact Email: [email protected] Registrar Abuse Contact Phone: +33.170377661 Reseller: Domain Status: clientTransferProhibited http://www.icann.org/epp#clientTransferProhibited Domain Status: Domain Status: Domain Status: Domain Status: Registry Registrant ID: A4595-GANDI-YOHP Registrant Name: Marco Arment Registrant Organization: Registrant Street: P.O. Box 500 Registrant City: Hastings on Hudson Registrant State/Province: New York Registrant Postal Code: 10706 Registrant Country: US Registrant Phone: +1.9149791394 Registrant Phone Ext: Registrant Fax: Registrant Fax Ext: Registrant Email: [email protected] Registry Admin ID: A4595-GANDI-YOHP Admin Name: Marco Arment Admin Organization: Admin Street: P.O. Box 500 Admin City: Hastings on Hudson Admin State/Province: New York Admin Postal Code: 10706 Admin Country: US Admin Phone: +1.9149791394 Admin Phone Ext: Admin Fax: Admin Fax Ext: Admin Email: [email protected] Registry Tech ID: A4595-GANDI-YOHP Tech Name: Marco Arment Tech Organization: Tech Street: P.O. Box 500 Tech City: Hastings on Hudson Tech State/Province: New York Tech Postal Code: 10706 Tech Country: US Tech Phone: +1.9149791394 Tech Phone Ext: Tech Fax: Tech Fax Ext: Tech Email: [email protected] Name Server: ROCKY.NS.CLOUDFLARE.COM Name Server: TEGAN.NS.CLOUDFLARE.COM Name Server: Name Server: Name Server: Name Server: Name Server: Name Server: Name Server: Name Server: DNSSEC: Unsigned URL of the ICANN WHOIS Data Problem Reporting System: http://wdprs.internic.net/ >>> Last update of WHOIS database: 2026-10-01T18:22:43Z <<< For more information on Whois status codes, please visit https://www.icann.org/epp Reseller Email: Reseller URL: Personal data access and use are governed by French law, any use for the purpose of unsolicited mass commercial advertising as well as any mass or automated inquiries (for any intent other than the registration or modification of a domain name) are strictly forbidden. Copy of whole or part of our database without Gandi's endorsement is strictly forbidden. A dispute over the ownership of a domain name may be subject to the alternate procedure established by the Registry in question or brought before the courts. For additional information, please contact us via the following form: https://www.gandi.net/support/contacter/mail/ % Query time: 486 msec % WHEN: Thu Oct 01 18:22:43 UTC 2026