Summary
- Registrar
- NameCheap, Inc.
- Status
- clientTransferProhibited
- Created on
- August 8, 2023
- Expires on
- August 8, 2027
- Name servers
- ns2.nucleusopen.me, ns1.nucleusopen.me
- Mail servers
- mx.nucleusopen.me
- SPF
- Soft
- DKIM
- No key found among the common selectors
- Website
- See the website
Authorized senders (SPF)
E-mails sent by any other server are accepted but flagged as suspicious.
SPF lists the servers allowed to send e-mails for nucleusopen.me.
| Rule | Value | Result |
|---|---|---|
| a | dns.nucleusopen.me | Allowed |
| all | — | Suspicious |
Top-level DNS lookups: 1 of 10 allowed
Record
v=spf1 a:dns.nucleusopen.me ~all
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 nucleusopen.me arrive; SPF, DKIM and DMARC let mail servers check that an e-mail claiming to come from nucleusopen.me 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 @nucleusopen.me 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
nucleusopen.me MX 10 mx1.nucleusopen.me. nucleusopen.me MX 20 mx2.nucleusopen.me.
What the record contains
- 10, 20
- Priority: the server with the lowest number is tried first. Servers with equal priority share the load.
- mx1.nucleusopen.me.
- 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
nucleusopen.me 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.nucleusopen.me, 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.nucleusopen.me 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.nucleusopen.me, 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.nucleusopen.me 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 nucleusopen.me
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 | 5.135.99.61 |
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 |
|---|---|
| ns2.nucleusopen.me | 5.135.99.61 |
| ns1.nucleusopen.me | 5.135.99.61 |
Mail servers (MX)
MX records point to the servers that receive e-mails sent to the domain, that is to @nucleusopen.me 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 |
|---|---|---|
| 0 | mx.nucleusopen.me | 5.135.99.61 |
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.nucleusopen.me.
| Name | Content |
|---|---|
| nucleusopen.me | v=spf1 a:dns.nucleusopen.me ~all |
Related IP addresses
IPv4 addresses used by nucleusopen.me: website, name servers, mail servers and senders authorized by SPF.
| IP address | Used for | /24 block |
|---|---|---|
| 5.135.99.61 | Website, Name server ns2.nucleusopen.me, Name server ns1.nucleusopen.me, Mail server mx.nucleusopen.me | 5.135.99.0/24 |
WHOIS of the domain nucleusopen.me
Domain Name: nucleusopen.me Registry Domain ID: REDACTED Registrar WHOIS Server: whois.namecheap.com Registrar URL: https://www.namecheap.com/ Updated Date: 2026-09-25T20:52:30Z Creation Date: 2023-08-08T10:02:38Z Registry Expiry Date: 2027-08-08T10:02:38Z Registrar: NameCheap, Inc. Registrar IANA ID: 1068 Registrar Abuse Contact Email: [email protected] Registrar Abuse Contact Phone: +1.9854014545 Domain Status: clientTransferProhibited https://icann.org/epp#clientTransferProhibited Registry Registrant ID: REDACTED Registrant Name: REDACTED Registrant Organization: Privacy service provided by WITHHELD FOR PRIVACY LLC Registrant Street: REDACTED Registrant City: REDACTED Registrant State/Province: Delaware Registrant Postal Code: REDACTED Registrant Country: US Registrant Phone: REDACTED Registrant Phone Ext: REDACTED Registrant Fax: REDACTED Registrant Fax Ext: REDACTED Registrant Email: REDACTED Registry Admin ID: REDACTED Admin Name: REDACTED Admin Organization: REDACTED Admin Street: REDACTED Admin City: REDACTED Admin State/Province: REDACTED Admin Postal Code: REDACTED Admin Country: REDACTED Admin Phone: REDACTED Admin Phone Ext: REDACTED Admin Fax: REDACTED Admin Fax Ext: REDACTED Admin Email: REDACTED Registry Tech ID: REDACTED Tech Name: REDACTED Tech Organization: REDACTED Tech Street: REDACTED Tech City: REDACTED Tech State/Province: REDACTED Tech Postal Code: REDACTED Tech Country: REDACTED Tech Phone: REDACTED Tech Phone Ext: REDACTED Tech Fax: REDACTED Tech Fax Ext: REDACTED Tech Email: REDACTED Name Server: ns1.nucleusopen.me Name Server: ns2.nucleusopen.me DNSSEC: unsigned URL of the ICANN Whois Inaccuracy Complaint Form: https://icann.org/wicf/ >>> Last update of WHOIS database: 2026-10-01T12:13:20Z <<< For more information on Whois status codes, please visit https://icann.org/epp Terms of Use: Access to WHOIS information is provided to assist persons in determining the contents of a domain name registration record in the registry database. The data in this record is provided by Identity Digital or the Registry Operator for informational purposes only, and accuracy is not guaranteed. This service is intended only for query-based access. You agree that you will use this data only for lawful purposes and that, under no circumstances will you use this data 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 data recipient's own existing customers; or (b) enable high volume, automated, electronic processes that send queries or data to the systems of Registry Operator, a Registrar, or Identity Digital except as reasonably necessary to register domain names or modify existing registrations. When using the Whois service, please consider the following: The Whois service is not a replacement for standard EPP commands to the SRS service. Whois is not considered authoritative for registered domain objects. The Whois service may be scheduled for downtime during production or OT&E maintenance periods. Queries to the Whois 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 Whois service access. Abuse of the Whois 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 Whois 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 provided by Identity Digital can be requested by submitting a request via the form found at https://www.identity.digital/about/policies/whois-layered-access/. The Registrar of Record identified in this output may have an RDDS service that can be queried for additional information on how to contact the Registrant, Admin, or Tech contact of the queried domain name. Identity Digital Inc. and Registry Operator reserve the right to modify these terms at any time. By submitting this query, you agree to abide by this policy. Domain name: nucleusopen.me Registry Domain ID: ee3b528fbec44199a04083636e061aa6-DONUTS Registrar WHOIS Server: whois.namecheap.com Registrar URL: http://www.namecheap.com Updated Date: 2026-07-09T05:43:22.31Z Creation Date: 2023-08-08T10:02:38.16Z Registrar Registration Expiration Date: 2027-08-08T10:02:38.16Z Registrar: NAMECHEAP INC Registrar IANA ID: 1068 Registrar Abuse Contact Email: [email protected] Registrar Abuse Contact Phone: +1.9854014545 Reseller: NAMECHEAP INC Domain Status: clientTransferProhibited https://icann.org/epp#clientTransferProhibited Registry Registrant ID: Registrant Name: Redacted for Privacy Purposes Registrant Organization: Privacy service provided by WITHHELD FOR PRIVACY LLC Registrant Street: 16192 Coastal Highway Registrant City: Lewes Registrant State/Province: Delaware Registrant Postal Code: 19958 Registrant Country: US Registrant Phone: +1.3022061391 Registrant Phone Ext: Registrant Fax: Registrant Fax Ext: Registrant Email: [email protected] Registry Admin ID: Admin Name: Redacted for Privacy Purposes Admin Organization: Privacy service provided by WITHHELD FOR PRIVACY LLC Admin Street: 16192 Coastal Highway Admin City: Lewes Admin State/Province: Delaware Admin Postal Code: 19958 Admin Country: US Admin Phone: +1.3022061391 Admin Phone Ext: Admin Fax: Admin Fax Ext: Admin Email: [email protected] Registry Tech ID: Tech Name: Redacted for Privacy Purposes Tech Organization: Privacy service provided by WITHHELD FOR PRIVACY LLC Tech Street: 16192 Coastal Highway Tech City: Lewes Tech State/Province: Delaware Tech Postal Code: 19958 Tech Country: US Tech Phone: +1.3022061391 Tech Phone Ext: Tech Fax: Tech Fax Ext: Tech Email: [email protected] Name Server: ns1.nucleusopen.me Name Server: ns2.nucleusopen.me DNSSEC: unsigned URL of the ICANN WHOIS Data Problem Reporting System: http://wdprs.internic.net/ >>> Last update of WHOIS database: 2026-09-30T14:13:27.34Z <<< For more information on Whois status codes, please visit https://icann.org/epp % Query time: 7074 msec % WHEN: Thu Oct 01 12:13:20 UTC 2026