Dataweaz

merck.com

Summary

Registrar
MarkMonitor Inc.
Status
clientDeleteProhibited
Created on
December 9, 1992
Expires on
December 8, 2027
Name servers
dns2.p03.nsone.net, ns04.msddns.com, ns02.msddns.com, ns01.msddns.com, dns1.p03.nsone.net, dns4.p03.nsone.net, dns3.p03.nsone.net, ns03.msddns.com
Mail servers
msdcloud.mail.protection.outlook.com
DMARC
Reject
SPF
Soft

Spoofing protection (DMARC)

Reject

E-mails spoofing this domain are rejected.

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

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

Record

v=DMARC1; p=reject; fo=1; ri=3600; 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 merck.com.

RuleValueResult
includespf1.merck.comAllowed
includespf2.merck.comAllowed
all—Suspicious

Top-level DNS lookups: 2 of 10 allowed

Record

v=spf1 include:spf1.merck.com include:spf2.merck.com ~all

E-mail signing (DKIM)

DKIM keys published by merck.com under the most common selectors. Other keys may exist under selectors specific to each sending service.

SelectorLikely serviceKeyStatus
selector1Microsoft 365RSA 2048 bitsActive
selector2Microsoft 365RSA 2048 bitsActive
k1MailchimpRSA 1024 bits · shortActive
s1SendGridRSA 2048 bitsActive
s2SendGridRSA 2048 bitsActive
key1—RSA 2048 bitsActive

RSA keys shorter than 2048 bits, called short keys, are discouraged: they are easier to break.

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

merck.com  MX  10 mx1.merck.com.
merck.com  MX  20 mx2.merck.com.

What the record contains

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

merck.com  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.merck.com, 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.merck.com  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.merck.com, 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.merck.com  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 merck.com

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.

TypeIP address
A192.0.66.119

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.

ServerIP address
dns2.p03.nsone.net198.51.45.3
ns04.msddns.com45.54.26.193
ns02.msddns.com45.54.26.65
ns01.msddns.com45.54.26.1
dns1.p03.nsone.net198.51.44.3
dns4.p03.nsone.net198.51.45.67
dns3.p03.nsone.net198.51.44.67
ns03.msddns.com45.54.26.129

Mail servers (MX)

MX records point to the servers that receive e-mails sent to the domain, that is to @merck.com 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.

PriorityServerIP address
0msdcloud.mail.protection.outlook.com52.101.50.10

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.merck.com.

NameContent
merck.com00D5f000000JtAy=1TBVm0000000422
merck.com00DWL000002gYiT=1TBWL0000000LKb;00DWL000002h1u9=1TBWL00000009Pt;00DWG000004XWmn=1TBWG0000000BMr
merck.com00DWK000004QOCT=1TBWK0000000L9J;00DWK000004QOE5=1TBWK0000000L7h;00DWA000004mV8r=1TBWA0000004oe9
merck.com00DWF00000Bc4Vh=1TBWF0000001Biz;00DWK000005JNNp=1TBWK0000000M29
merck.com00Dfi000002Dskb=1TBa70000000CPN;00Dao00001OXaRP=1TBaZ0000000OQX
merck.comatlassian-sending-domain-verification=a32a09e8-4bc0-48d3-9439-de8a9dc1b0e5
merck.comzenqms-domain-verification=4d82ffd9d36ed2205923d4d7f33f3ab3888561d0cdfdf2f6fc4e752ddd85a40b
merck.comzenqms-domain-verification=13c715f5aa60781b92a4020bae71480c9767ad7756735b358a6f5d8f18ece42a
merck.comMS=ms73390276
merck.comMS=ms81705768
merck.com44e4c91b36f190hu3vc5j589r
merck.com20q8kh5vb8lc34dg17lk07rh5n
merck.com2a6hcn5keoukshbma518dg69a5
merck.com2mjbhlht9j0g3928i2oe5nqi6a
merck.com76dkj9u7598f7503gp8j9thda8
merck.comehklccfrmqtog011qavchou5oo
merck.comjlvgnenmenn78fup62soefgcph
merck.com8gcvl81vgkbcnq6nz80f12rq0cy438h2
merck.comg4mp7kf92k0pttl4dwpc66sm3y4hhslc
merck.comrvxhp3tp6ft3s0tm57v4fmnt2x59clpq
merck.comw0sg3gyn09nh3tqmf65frh18nddvmx3v
merck.comy24y8d5tf27321g3h6rs2z3q8k8md9ls
merck.comys4kh6150g7rsrgnr5kzmqzykkwpbhlv
merck.comzm4xgs82p44jf5nbr2fv8k95d34vljck
merck.com0ed1fe018a31147b85218b4de29ec808fd5b4ab1d8
merck.comTNvYRxzRPZ9bp12r3tS8oIWZ7CqmudOjsx7_f2a9UCg
merck.comibmid= 81d5ac3b-53ce-4d24-9062-4057a4045f96
merck.comflexera-domain-verification-pjdxpopuhvhasmse
merck.comcloudhealth=1f6ab3c0-a9a8-4379-b750-c416c5a023d7
merck.comautodesk-domain-verification=QidA8UKJFkGFps0q21Ve
merck.com1password-site-verification=WOZWLMKFDJDBZI2GB6FKQCO4YA
merck.comdocker-verification=55bc797b-4c8f-40c0-ac57-17a644048b79
merck.comv=spf1 include:spf1.merck.com include:spf2.merck.com ~all
merck.commongodb-site-verification=EAy8hzGVPrh0smAXi9A0MQ1V7vlwR0L7
merck.comfacebook-domain-verification=9kjy8qvfwmsr3wjj8wci2waq80vl1c
merck.comsmartsheet-site-validation=2XUbLMBJFkkltyH3ngZFOlnIqFv29PvY
merck.comsmartsheet-site-validation=GOXFlXMlgROG9pZt7L1hLFsqtmKsCw3D
merck.comsmartsheet-site-validation=r3Eb_Uesikv5Y2hbkQapKITHfg03B91p
merck.comworkplace-domain-verification=cZLaRzArPk5jzUj4tcvJm8xtxeWedR
merck.comonetrust-domain-verification=1478f1a6e1ed4c2c9c099a356b4e1284
merck.comonetrust-domain-verification=6095750f880442f6a27969ee753b9623
merck.comvmware-cloud-verification-1840573e-2bc4-4fb4-b45d-cdc1083f431d
merck.comv=DMARC1; p=none; pct=100; rua=mailto:[email protected]
merck.comextensis-domain-verification=f9447776-1a22-4bda-b0da-16c1a41aea1c
merck.comgoogle-site-verification=3FzJ88NeaXEIhicFwNbTkVCZbN3If4NqR1JZ7F0rU8o
merck.comgoogle-site-verification=Mxpc7VG_3cBpAqm9gE0YjgVs80pVkZs6-mSZTJeDZSM
merck.comgoogle-site-verification=TNvYRxzRPZ9bp12r3tS8oIWZ7CqmudOjsx7_f2a9UCg
merck.comgoogle-site-verification=fFR6UZDhXRia_VuIGTVOCOlwQzpsndzqs6PubIIOfnk
merck.comgoogle-site-verification=k7Tz6dZz7mJa7iQ8I1cqR2Kn_gDRTYoWEMMhcSFyYT4
merck.com_globalsign-domain-verification=J7ojurG8pfHB1_T7RRXWhSXvJnAJ-Ly9X4moPnOfve
merck.comNM3NBUfHMehhQbbV4KLwYKCcHEGbMIeUrR8WXIn+ECtXmrshEmZFlLtQN/Ve4ley/2xE5Dj5oFB51rYZBAt7xA==
merck.comkjDXtGLRgdP5O01I8wySejNk1/dm/A3GVOA1+hhDBKzg7pDUohIuvQh+yqF8s4c5ypL6vo1xh0shh6oaFlpGUg==
merck.comDynatrace-site-verification=3a44c6ac-87f4-4c95-a4b2-61b75996bcf9__556f2vbvbo83bs55ff6a3itci9
merck.comadobe-idp-site-verification=c9df9d351e2d97fe46b43740c6593677199a0bc21036f69a3e304fb45ba1fdba
merck.comappspace-domain-verification=f5ee13f2c71814a40d6354018ec5f8025ca10f17c08c58927e1491feb4a7d7b8
merck.comatlassian-domain-verification=ciUKXFyshP71uhmcYlixwC3ClAKoTjYehQTYKZ/4WdBAEfdP7ZKxfTbXsSYkVgky
merck.comteamviewer-sso-verification=3dfc5700d0fb490ea1335107680a2dcf
merck.comremarkable-domain-verification=4b36037e-af38-45a6-a388-0b533e44d530 sprout-social-0b4bc2b6-7907-43f6-a322-f6573e4ff502
merck.commongodb-site-verification=o7H6ABW4ieD3bnFBQolivwtqBAFNd2zt
merck.commongodb-site-verification=PuKOAIC2peU8LwH9FMFY0YcqPdtcPdXZ
merck.commongodb-site-verification=I5lG10QLafEXrk8Q2O8Duu84hUOkoLxm
merck.commongodb-site-verification=ItgIzlgsIWpv1dzm84x1QzLoYJAlTcvO
merck.commeta-work-account-domain-verification=b21f858f-9e4f-4797-8eec-7b6deba1c12a
merck.comwww.geneious.com:domain-verification=YvQ9WW-5OZ4azKMJRTV-kQ
merck.comonetrust-domain-verification=5a30018677674dedbcc9bb89131980bc
_dmarc.merck.comv=DMARC1; p=reject; fo=1; ri=3600; rua=mailto:[email protected]; ruf=mailto:[email protected]
selector1._domainkey.merck.comv=DKIM1; k=rsa; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA07QaJud9qdw5HcSW9Z47o7Cns47ZQuY0rH+Gi527tY1S3d7zCO4h0T4rWGJ7sV9rKIJU40O8PfRfFO74pGMd7DEx0s7XBkyedgyhcWd3ZD98gD9sjujE4s0vJ/Nm49jAZl+rC2pqSmdOTV77arEXnDT+lhTUOsHHBgsd2GnGTf34eQESJczfBpoAKaxwyGgQXJXKMEcNlHCi7ajsyLRebDaQTDKIK/BtzvW/uZ+Z8F2aEWpKPRX4NCicpWZtDI+GaX/zMdJtw14OWXQFpVQLSvYsABwedU58UMYN8C41O/G8WQDZzmMQQWu6aVNSqZ+5/we7qG01qtHNRRwtrCNXVQIDAQAB;
selector2._domainkey.merck.comv=DKIM1; k=rsa; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA2QeS7wi29xnNG6hjJHAdrtW1v6Mu55pz0ETOO2znkh1Vh6VuvDo6VcKyQu3EDKELvQBpdHr3OyUJUznPSoIPymtrPqRwtSvKtuBC4QXQzcp3zD7Lz89T/qXApSUtP0r/EdUAkiPNV739xaBVzzdiErgsdYmF963OTCje+zRpsAxL6DraCZZcy3PFs4Xdmd5AJVd76ZymgF3jKsPcGO+zEif7Ffx8Oxk8EemilDFUh0m+CocmnHeJhMqn2qyIldnQgbptGFInW1XycPPhrShXhhqOsU/IAQOG85mEeV35rBgXX3eXAsWfnDSv3Zm51qof7mnbe3d9QSw2OsPc8RLguQIDAQAB;
k1._domainkey.merck.comk=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDbNrX2cY/GUKIFx2G/1I00ftdAj713WP9AQ1xir85i89sA2guU0ta4UX1Xzm06XIU6iBP41VwmPwBGRNofhBVR+e6WHUoNyIR4Bn84LVcfZE20rmDeXQblIupNWBqLXM1Q+VieI/eZu/7k9/vOkLSaQQdml4Cv8lb3PcnluMVIhQIDAQAB;
s1._domainkey.merck.comk=rsa; t=s; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA6JJvAXvR4t5mrGxJjhiUX0Gs+o0093YPHqtarubGGQD/gYhNva7H8m/wEawRcLhXimGp0X7LjMYWTTGpfsNJqAImJPpLPgYGoVOte6JUp0PwljyVnJfRGQo9Dpg6ulXPTAOOHvnFQJyeHbdg+mL7aGjzxaRIG6+PwVpfSfnr0iqL3xZCb5YMsmy4L2EM9fOGS00WJVQEkRPp/gexVV8ySGvbFozDwbBDmZFTcf/7TDq+lyLtI+6pPbBewAEKjOpG/gZxi198xR0tqGfcWD6cQp4FA4w2/tG8iD9q8598Hvt5RclZ/9gCJILdpANBM1azWLwtJnXz6ZTTB/CidLJ6+QIDAQAB
s2._domainkey.merck.comk=rsa; t=s; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEApZuAn5XmJXJaHb7MLve+93BcRHJlQcW8RAy7HzhBSNmDyfPRmtmI0kjKjrmid7ZTrrpnNbNW+3JhmtSyLpSqkPQQYRSuyyxQDSnMnMnumV9nJFZs+JsUo6FxjXcBcyRpQJ4CobewCEGhYJ+jPIJIDMi+No7x5t9o2rqyvoEcFg7tG4vhzI1P0+WRVuD8B6JDnQSw40DubyZD16bS8OAY9Lf3Ms9GBp7+k4+loHSDVv4vH0lLWchS8S4jD+trfwEbhM9qOorWNZpVlYhYv+8xC3gSJnLGIjCuypLsF40YnCCvOos8/ku5UdQ4gIziuAbUYExixMCODTjbqmnU1nVfswIDAQAB
key1._domainkey.merck.comv=DKIM1; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEArNGSwY191HDTqzwUFS1CoX21J8Y2+ixB1BoYiGDQNgLLuT8hE6hqQuoRGnIfRlWf0jOToQRQjE/fJI8G1HPh4QoSeXHqVom+A58cJMTVbS9MAc2CGpsbGkyWjfhitp8tRgruvAUVx4ndDWTPIozIFCc6ALg5jEC8x0kNcxVzFo7IJusukQDCNh+pnBR6n9j++rrWNinjq+oSm/sgv9xNo6zOzJwjfHMnlW4J2gNxyt3m0usde85t/N1f/rRq0roWGvbCKFaQwQI0nQv6zhebW5wXZdn/a4I64ypqCsyhbRVpx6WNPqBNMXn4G1xhMLO7q9MgqtiVXEsNkFbw2qzrEwIDAQAB

Related IP addresses

IPv4 addresses used by merck.com: website, name servers, mail servers and senders authorized by SPF.

IP addressUsed for/24 block
192.0.66.119Website192.0.66.0/24
198.51.45.3Name server dns2.p03.nsone.net198.51.45.0/24
45.54.26.193Name server ns04.msddns.com45.54.26.0/24
45.54.26.65Name server ns02.msddns.com45.54.26.0/24
45.54.26.1Name server ns01.msddns.com45.54.26.0/24
198.51.44.3Name server dns1.p03.nsone.net198.51.44.0/24
198.51.45.67Name server dns4.p03.nsone.net198.51.45.0/24
198.51.44.67Name server dns3.p03.nsone.net198.51.44.0/24
45.54.26.129Name server ns03.msddns.com45.54.26.0/24
52.101.50.10Mail server msdcloud.mail.protection.outlook.com52.101.50.0/24

WHOIS of the domain merck.com

Domain Name: MERCK.COM
   Registry Domain ID: 846879_DOMAIN_COM-VRSN
   Registrar WHOIS Server: whois.markmonitor.com
   Registrar URL: http://www.markmonitor.com
   Updated Date: 2025-11-06T09:10:41Z
   Creation Date: 1992-12-09T05:00:00Z
   Registry Expiry Date: 2027-12-08T05:00:00Z
   Registrar: MarkMonitor Inc.
   Registrar IANA ID: 292
   Registrar Abuse Contact Email: [email protected]
   Registrar Abuse Contact Phone: +1.2086851750
   Domain Status: clientDeleteProhibited https://icann.org/epp#clientDeleteProhibited
   Domain Status: clientTransferProhibited https://icann.org/epp#clientTransferProhibited
   Domain Status: clientUpdateProhibited https://icann.org/epp#clientUpdateProhibited
   Domain Status: serverDeleteProhibited https://icann.org/epp#serverDeleteProhibited
   Domain Status: serverTransferProhibited https://icann.org/epp#serverTransferProhibited
   Domain Status: serverUpdateProhibited https://icann.org/epp#serverUpdateProhibited
   Name Server: DNS1.P03.NSONE.NET
   Name Server: DNS2.P03.NSONE.NET
   Name Server: DNS3.P03.NSONE.NET
   Name Server: DNS4.P03.NSONE.NET
   Name Server: NS01.MSDDNS.COM
   Name Server: NS02.MSDDNS.COM
   Name Server: NS03.MSDDNS.COM
   Name Server: NS04.MSDDNS.COM
   DNSSEC: unsigned
   URL of the ICANN Whois Inaccuracy Complaint Form: https://www.icann.org/wicf/
>>> Last update of whois database: 2026-10-01T03:07:58Z <<<

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

NOTICE: The expiration date displayed in this record is the date the
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currently set to expire. This date does not necessarily reflect the expiration
date of the domain name registrant's agreement with the sponsoring
registrar.  Users may consult the sponsoring registrar's Whois database to
view the registrar's reported date of expiration for this registration.

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