masto.host - DNS, WHOIS, DMARC and SPF of the domain name

Summary

Registrar: NameCheap, Inc.
Status: clientTransferProhibited
Created on: April 18, 2017
Expires on: April 19, 2030
Name servers: ns4.masto.host, ns3.masto.host, ns1.masto.host, ns2.masto.host
Mail servers: in1-smtp.messagingengine.com, in2-smtp.messagingengine.com
DMARC: Quarantine
SPF: Soft
DKIM: 3 keys found
Website: See the website

Spoofing protection (DMARC)

Quarantine

E-mails spoofing this domain are sent to spam.

DMARC tells mail servers what to do with an e-mail that claims to come from masto.host but fails SPF and DKIM checks.

Policy: Quarantine
Subdomain policy: Quarantine
Messages covered: 100%
DKIM alignment: Relaxed
SPF alignment: Relaxed
Aggregate reports: [email protected]
Failure reports: [email protected]

Record

v=DMARC1; p=quarantine; rua=mailto:[email protected]; ruf=mailto:[email protected];

Authorized senders (SPF)

Soft

E-mails sent by any other server are accepted but flagged as suspicious.

SPF lists the servers allowed to send e-mails for masto.host.

Rule	Value	Result
include	mailgun.org	Allowed
include	spf.messagingengine.com	Allowed
all	—	Suspicious

Top-level DNS lookups: 2 of 10 allowed

Record

v=spf1 include:mailgun.org include:spf.messagingengine.com ~all

E-mail signing (DKIM)

DKIM keys published by masto.host 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	Revoked
fm3	Fastmail	RSA 2048 bits	Active

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 masto.host arrive; SPF, DKIM and DMARC let mail servers check that an e-mail claiming to come from masto.host 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 @masto.host 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

masto.host  MX  10 mx1.masto.host.
masto.host  MX  20 mx2.masto.host.

What the record contains

10, 20: Priority: the server with the lowest number is tried first. Servers with equal priority share the load.
mx1.masto.host.: 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

masto.host  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.masto.host, 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.masto.host  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.masto.host, 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.masto.host  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 masto.host

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	217.182.38.249

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
ns4.masto.host	185.136.99.66
ns3.masto.host	185.136.98.66
ns1.masto.host	185.136.96.66
ns2.masto.host	185.136.97.66

Mail servers (MX)

MX records point to the servers that receive e-mails sent to the domain, that is to @masto.host 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	103.168.172.218
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.masto.host.

Name	Content
masto.host	v=spf1 include:mailgun.org include:spf.messagingengine.com ~all
masto.host	google-site-verification=jMA2F9RGkfR6ay0Rxmoco_pkMsbeqqpLLgl7FczB4ZU
masto.host	google-site-verification=q-Ni_p7rRP0GpykID39-M56VrkkuFHankk9xZHD3_qw
_dmarc.masto.host	v=DMARC1; p=quarantine; rua=mailto:[email protected]; ruf=mailto:[email protected];
fm1._domainkey.masto.host	v=DKIM1; k=rsa; n=Intentionally_Left_Blank_As_Per_DKIM_Rotation_BCP; p=
fm2._domainkey.masto.host	v=DKIM1; k=rsa; n=Intentionally_Left_Blank_As_Per_DKIM_Rotation_BCP; p=
fm3._domainkey.masto.host	v=DKIM1; k=rsa; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAsUKFyOipQ+SPTw4pi5PmKe2lyevcGGecG3lknGFsDBIctbCPbzSh3WMONdSMIdkj+N8JxQ2qb5ErU55urTmByx4WTcC9OQJKWz0ubAlba2lr/0mnOQSy5JOYanEs2XeZ3Thy8Kj4F92SoR4qyXGrvbGiVi9cZYAQTNjjHypBECgC2pfTxgx0TSQMWC+706oApOb01PqAVpwcGRXyMlPIM3uQZMllPrmdnrpO3fVNp+h4Esy0Rq7dS/cA/+LcdKxtnjxZa3UPQ8WA4rhX/yxd6enC472mGiBpjBo2mG4xEnuLh6R5qxIkBbXKPQcwqvDT1VoEjqOgIGC8ozuygeRAPwIDAQAB

Related IP addresses

IPv4 addresses used by masto.host: website, name servers, mail servers and senders authorized by SPF.

IP address	Used for	/24 block
217.182.38.249	Website	217.182.38.0/24
185.136.99.66	Name server ns4.masto.host	185.136.99.0/24
185.136.98.66	Name server ns3.masto.host	185.136.98.0/24
185.136.96.66	Name server ns1.masto.host	185.136.96.0/24
185.136.97.66	Name server ns2.masto.host	185.136.97.0/24
103.168.172.218	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 masto.host

Domain Name: masto.host
Registry Domain ID: D46912611-CNIC
Registrar WHOIS Server: whois.namecheap.com
Registrar URL: https://www.namecheap.com/
Updated Date: 2025-07-29T15:04:19.000Z
Creation Date: 2017-04-18T00:19:43.000Z
Registry Expiry Date: 2030-04-18T23:59:59.000Z
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
Name Server: ns1.masto.host
Name Server: ns2.masto.host
Name Server: ns3.masto.host
Name Server: ns4.masto.host
DNSSEC: unsigned
URL of the ICANN RDDS Inaccuracy Complaint Form: https://icann.org/wicf

>>> Last update of WHOIS database: 2026-10-01T22:12:09.739Z <<<

For more information on domain status codes, please visit https://icann.org/epp

The WHOIS information provided in this page has been redacted
in compliance with ICANN's Temporary Specification for gTLD
Registration Data.

The data in this record is provided by Tucows Registry for informational
purposes only, and it does not guarantee its accuracy. Tucows Registry is
authoritative for whois information in top-level domains it operates
under contract with the Internet Corporation for Assigned Names and
Numbers. Whois information from other top-level domains is provided by
a third-party under license to Tucows Registry.

This service is intended only for query-based access. By using this
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purposes and that, under no circumstances will you use (a) data
acquired for the purpose of allowing, enabling, or otherwise supporting
the transmission by e-mail, telephone, facsimile or other
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or solicitations to entities other than your existing  customers; or
(b) this service to enable high volume, automated, electronic processes
that send queries or data to the systems of any Registrar or any
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modify existing domain name registrations.

Tucows Registry reserves the right to modify these terms at any time. By
submitting this query, you agree to abide by this policy. All rights
reserved.
Domain name: masto.host
Registry Domain ID: D46912611-CNIC
Registrar WHOIS Server: whois.namecheap.com
Registrar URL: http://www.namecheap.com
Updated Date: 2025-07-29T15:04:19.00Z
Creation Date: 2017-04-18T00:19:43.00Z
Registrar Registration Expiration Date: 2030-04-18T23:59:59.00Z
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.masto.host
Name Server: ns2.masto.host
Name Server: ns3.masto.host
Name Server: ns4.masto.host
DNSSEC: unsigned
URL of the ICANN WHOIS Data Problem Reporting System: http://wdprs.internic.net/
>>> Last update of WHOIS database: 2026-10-01T17:12:10.24Z <<<
For more information on Whois status codes, please visit https://icann.org/epp

% Query time: 1241 msec
% WHEN: Thu Oct 01 22:12:09 UTC 2026