Dataweaz

nielsen.com

Summary

Registrar
MarkMonitor Inc.
Status
clientDeleteProhibited
Created on
May 8, 1991
Expires on
May 9, 2027
Name servers
pdns2.ultradns.net, pdns1.ultradns.net, pdns4.ultradns.org, pdns5.ultradns.info, pdns6.ultradns.co.uk, pdns3.ultradns.org
Mail servers
aspmx.l.google.com, alt1.aspmx.l.google.com, alt2.aspmx.l.google.com, alt3.aspmx.l.google.com, alt4.aspmx.l.google.com
DMARC
Quarantine
SPF
Delegated
DKIM
8 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 nielsen.com but fails SPF and DKIM checks.

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

Record

v=DMARC1; p=quarantine; sp=reject; rua=mailto:[email protected]; ruf=mailto:[email protected]; fo=1;

Authorized senders (SPF)

Delegated

The policy is defined by the domain nielsenmedia.com (redirect).

SPF lists the servers allowed to send e-mails for nielsen.com.

RuleValueResult
redirectnielsenmedia.com—

Top-level DNS lookups: 1 of 10 allowed

Record

v=spf1 redirect=nielsenmedia.com

E-mail signing (DKIM)

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

SelectorLikely serviceKeyStatus
k2MailchimpRSA 2048 bitsActive
k3MailchimpRSA 2048 bitsActive
mandrillMandrillRSA 1024 bits · shortActive
s1SendGridRSA 2048 bitsActive
s2SendGridRSA 1024 bits · shortActive
zendesk1ZendeskRSA 2048 bitsActive
zendesk2ZendeskRSA 2048 bitsActive
smtp—RSA 1024 bits · shortActive

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

nielsen.com  MX  10 mx1.nielsen.com.
nielsen.com  MX  20 mx2.nielsen.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.nielsen.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

nielsen.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.nielsen.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.nielsen.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.nielsen.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.nielsen.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 nielsen.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
A192.0.66.96

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
pdns2.ultradns.net204.74.109.1
pdns1.ultradns.net204.74.108.1
pdns4.ultradns.org199.7.69.1
pdns5.ultradns.info204.74.114.1
pdns6.ultradns.co.uk204.74.115.1
pdns3.ultradns.org199.7.68.1

Mail servers (MX)

MX records point to the servers that receive e-mails sent to the domain, that is to @nielsen.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
1aspmx.l.google.com66.102.1.27
5alt1.aspmx.l.google.com192.178.213.26
5alt2.aspmx.l.google.com142.251.127.27
10alt3.aspmx.l.google.com172.253.148.26
10alt4.aspmx.l.google.com142.250.147.26

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.nielsen.com.

NameContent
nielsen.commiro-verification=bd31f86ea27054eddbcf39ef767cce5163f1d7dd
nielsen.comv=spf1 redirect=nielsenmedia.com
nielsen.comcisco-ci-domain-verification=6942166472e691ef8e55cb4759b596597527a28b064e4fc259257026c4f601be
nielsen.comspf2.0/pra
nielsen.comamazonses:CMjF0nhMIlOStaYBRZZf+5dETxEYbvqkyw6bo3tG62U=
nielsen.comdocusign=eff616df-1c79-4f17-a483-41df197156e0
nielsen.comMS=ms41051260
nielsen.comamazonses:EDDacT4UsDG+Qc+FRfYpNNvEOQzeaShKQUSi8K7tNAU=
nielsen.comamazonses:PGjwQCzzs3Wm+ONWo5DNcDbTKPBaomU4C+g+w8bQ0Cc=
nielsen.comanthropic-domain-verification-xea344=7JYUkKzKsua4Uwb8UBXKT88Vu
nielsen.comamazonses:prkq66HtyEY2olarwkuQTxOKmVpexTvKSKZD0nTrZsw=
nielsen.comatlassian-sending-domain-verification=8c150d6d-0537-4aaf-80e9-a9dd8ca01648
nielsen.comasv=bf2e463d186d760daa4dac04f2189363
nielsen.comS++U9DTmPuWS35PmOtd+b9EGXReFRPlH3OCLbosxcd4=
nielsen.compardot_85462_*=3d08aa457edc0a6d5f8402a9f27e97be967bd899ec40de3ef5517a10c3a7bad0
nielsen.com_ai81x2u5stppdkyre8n0ezt5ky1t4lt
nielsen.comwrike-verification=Mjk1ODE5OTpkM2Y4Y2NmZDY3YTI5YWQ3ZGExMjJhNmRmNjRlYjBjMWI1YmQ3YWFiMzUzMDhlNjQ4ZDcwZDAxODNiMDU0NGIx
nielsen.com_globalsign-domain-verification=VvDpOdxqrg1tm5Pqkg2JSk9H5WqnI_O1VYhH7wUif6
nielsen.comliveramp-site-verification=ACjlvkmxMUhaIkPSnxfs-XEfK7bUAz0a9NGGrnYjGfo
nielsen.comvertexinc-cloud-f4e45a1f-b0d6-43db-b9fc-4ce6f7304034
nielsen.comamazonses:RU3KDh1Q6flY8zP+pA0WOA8kuCaXCFdSoNIdQBySLYQ=
nielsen.comfacebook-domain-verification=sl8du0ke9guurybwg45jxj8i479ev7
nielsen.com_globalsign-domain-verification=uqDQCq1dOLC9lyzN68Grz66P1qpMXrUgu-Q111CVVw
nielsen.compardot31782=b80a14ec11c49bb8307f78a6de296a7fd52bf73edbe8b1148c699eba6d6fc88e
nielsen.comsmartsheet-site-validation=vFfZpWmTE4YfhFSxtnG5j3_p_hu4k_xO
nielsen.comonetrust-domain-verification=8c659e5cd0434b48af1ee2a02d71471c
nielsen.comadobe-idp-site-verification=d4250894cee614bbe020fa949280b0ad410c6b2930ba4383f4652a135544f587
nielsen.comDynatrace-site-verification=e8499418-763b-4e07-a2a9-630887963898__2lre76d6k2cspk5nbhcab5vkm0
nielsen.comamazonses:0JosrlclByQF0TUsPNy0SQef9qg/hdQRAXwkGMEKxUA=
nielsen.comgoogle-site-verification=bxXOriWggTqH_8xPx5gPdOwac9leSuqcQludAHOxJE0
nielsen.comMS=ms67552876
nielsen.com[email protected]
nielsen.comcursor-domain-verification-nrtyzf=yn7HXR3200uZTbCpwUOh2WpNk
nielsen.comdocusign=c34c43dd-9b32-43cc-8e1a-927cec32c6ed
nielsen.comkiro-site-verification=c87b62bd-d1a9-4fbb-87c4-467cd5e5c10d
nielsen.comworkplace-domain-verification=UFAkrwf7ECD95XHT8EBiP1aQoYsZPu
nielsen.compardot407042=326c335e144c4c389b1fd392bfce3fe651f86670057bbce87a5cbba848477c5a
nielsen.comcisco-ci-domain-verification=4cb7d8a43966e27101c7b4a6f465153af246a51d22896fb10771c0f7bf0480a
nielsen.com69fddfc11326d61913ff947e.hoxhuntsigning.com
nielsen.comatlassian-domain-verification=sTb4hFWtIi5V/G7/I/PG5eYIA95YUMrC+ucuxckH99NzjiBo/5kYo94NeHCG+Rgy
nielsen.comapple-domain-verification=JTibV8tKhqrsFjn5
nielsen.com78bbee88-ff35-4ebd-a89c-c171623a2556
nielsen.compardot881703=bda145131aa75cc8b4ffbcd3a03b6030184b13efe5c428318ae54a4fd575a548
nielsen.comvmware-cloud-verification-e7e740f3-1587-48ca-a362-dfb52b02dab2
_dmarc.nielsen.comv=DMARC1; p=quarantine; sp=reject; rua=mailto:[email protected]; ruf=mailto:[email protected]; fo=1;
k2._domainkey.nielsen.comv=DKIM1; k=rsa; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAv2aC2KjGKLOwTweBY5A9RpjsxaBXR9r7OAU6U8/zn92ivImI75naUujWbItRI/QmL1jy5PWGqLwoUA0b90ObWaLDc+i9MtTNmGeWO009hr20fIxhGg6XBT2kjZ1DTThopSe1nAndsupmcBwlQ5Q6LJ+ZAxLcujnPIxM0ZBLmgpkv8u6RfY4eFP8OLvdAW3oSuB0DyLDigQX4Sj8wBO4YIdQH6AAmBeOsidsKAFNFUCpc3vCxtBDR12U+cBg724l3sBkMQ8evnz6idnqxq9QAVYh8k4kJ+RP+6cqTdy7LjIm8xY/bQNpQIpGUAuDo2DjLcCDun9DAI4Q/3z+Q0o9QuQIDAQAB;
k3._domainkey.nielsen.comv=DKIM1; k=rsa; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAsYGiMSn7fsUqSvfSX40x9R1OlRtbNiCY80lHRIlcKx3XDIR7257aUx+q9CSIARdfTL6KCuLGNFx5g9TgVr6png4ajcieSQGtOehBgxnkDN8aAA5TX0FmFrcefJU0JoxLOF09EKgXxhSSHCk/ekVb0PXSboHXoZ9+EI404F1qhcwXXIgHXTaUthHTut2P6BBZhIXIgvDe/w49GchR7MRJqjNb7neEBbYHbgWuBTvvHCg7Gy6m6n9krYK+ROWq3dVvXy9plAGK3ygM+HtjIiMt7arRGMOF0WgDTz7YdN9BGpt6BvXxLnjiQcgS5T9n+cIyPZgiWzDMXNlaEEdKTEKxrwIDAQAB;
mandrill._domainkey.nielsen.comv=DKIM1; k=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQCrLHiExVd55zd/IQ/J/mRwSRMAocV/hMB3jXwaHH36d9NaVynQFYV8NaWi69c1veUtRzGt7yAioXqLj7Z4TeEUoOLgrKsn8YnckGs9i3B3tVFB+Ch/4mPhXWiNfNdynHWBcPcbJ8kjEQ2U8y78dHZj1YeRXXVvWob2OaKynO8/lQIDAQAB
s1._domainkey.nielsen.comk=rsa; t=s; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA6a9pe28RKIb/cPoF9pChmh16KDQm3mR8bXLuis+LhW9dnOkcku+9vKSxpBeDar00z5sPJdKKUM5xZ3vAV3U9QmmzJ0KbfKiNHUde9iDFEmXVXCCNDW5xhZ9TJjEjnwtHDMBmsX+Ynwm5JpDiU6E/meogK2NVHvB9pIfeY6k2gLrgzpnybmZRntXF0RgFyLw4n6tfH+/IaKGShlodxmO2+vILC8BWfr0HeehYVkwjiytogqH7z0fGIWqD8PjXgEupW54AMiCrr3zQyx3b5Hm+FPh36nspA5oZZZZEfvjZhiUbpKgoXSOT5f4Y0sCneWlbe6TSluIO35KYDPaLzI8uEwIDAQAB
s2._domainkey.nielsen.comk=rsa; t=s; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDIPMAS+FxZ3IAtbVQqC8WfqjX+82FBRdruhfh2yGyqqBrdvfMl3o8TmOuU2/aF6AcwJdyE9REi2gVvaD8Gq2NCRjhfjV0tc7N81Ol0MdnHaV/o/ur8l+p/O6dpFHuTAnEgJ2W0YQ86AnJij33WD/iB96IQh5BE7K8LLM4ksr3vIwIDAQAB
zendesk1._domainkey.nielsen.comv=DKIM1;t=s;n=core;k=rsa;p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA9IqdLrO3Zr2/56MHt8oQVCQorP0Bl2Fz9sM2tFBnJCdB/HogQmuudEg2xAovCN2PYpw44UijIvPuBoT9vxiv6ZCBJTLJXa82r6ke5rE4tbe9NKFIrVIb9S306cJDrnKFMDb8p0dU/Su0+eUR5gVAOtCuz2L8HAzs5edvsEvD/Fb4ny1RLNSEPZkIQLfGhVxQeWANm3+1Jwb/OBVXV9k0nKpWrpgqcmO7NzroJirp014RQY7rGi60JLUubc6XhvoFQBQrtOAdVlZC5wvfS1bgpq5kQpdP7cajIqWCeqxPTeo0ZUpey2ZcaygEsZz0Z3Gs5wDzyuqd7/ADpr2jNF7ozwIDAQAB
zendesk2._domainkey.nielsen.comv=DKIM1; t=s; n=core; k=rsa; p=MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAmiSFNkgXrO3I8aOaPONDZWHv027rkiGIwb838OyXPgvFDEkCV/qGcdXSjZnaVAadrTm/oKnL8WOltP9zB1FLEuKt0fTi5zRyKPE4oIYCnEzXwrGqzjUcCABQBawQVqvXjDOaYh9Lhp8W5PYOLo905vRW7ipyIMDhuzBOJls91/WWXnNK0OwP3RghiisZjA3K2KqtRwf7w6GjNeNuAMNhvcmgAN15d/mhK+dev/hcRbal66RoYyTD8c0F0isahWH0envEX8aj+SBhheNk0/U37dGE+4nFaY5yP9CUlYjFKDSIKZgHzG4Hci3t/RubU58pi6BCrQQdAFvIOeDFeCZ0ywIDAQAB
smtp._domainkey.nielsen.comk=rsa; p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQD3ooeoN1ydP6Szj7UUD0U2C/sfGVE/nUluy8mxYlb2f85w9liPBs+Ee7JrW1ciohaao8eLlm6Kb06jkhxqoQ/X4qgqKof816WuExR3nXe4MaNOOrdMyWghCpV1T3efuFkskj5eKYHaDJ/wZT8KxAbgHkqBY90EKAIUxO7uEgHXyQIDAQAB

Related IP addresses

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

IP addressUsed for/24 block
192.0.66.96Website192.0.66.0/24
204.74.109.1Name server pdns2.ultradns.net204.74.109.0/24
204.74.108.1Name server pdns1.ultradns.net204.74.108.0/24
199.7.69.1Name server pdns4.ultradns.org199.7.69.0/24
204.74.114.1Name server pdns5.ultradns.info204.74.114.0/24
204.74.115.1Name server pdns6.ultradns.co.uk204.74.115.0/24
199.7.68.1Name server pdns3.ultradns.org199.7.68.0/24
66.102.1.27Mail server aspmx.l.google.com66.102.1.0/24
192.178.213.26Mail server alt1.aspmx.l.google.com192.178.213.0/24
142.251.127.27Mail server alt2.aspmx.l.google.com142.251.127.0/24
172.253.148.26Mail server alt3.aspmx.l.google.com172.253.148.0/24
142.250.147.26Mail server alt4.aspmx.l.google.com142.250.147.0/24

WHOIS of the domain nielsen.com

Domain Name: NIELSEN.COM
   Registry Domain ID: 1580541_DOMAIN_COM-VRSN
   Registrar WHOIS Server: whois.markmonitor.com
   Registrar URL: http://www.markmonitor.com
   Updated Date: 2026-04-07T09:05:14Z
   Creation Date: 1991-05-08T04:00:00Z
   Registry Expiry Date: 2027-05-09T04:00:00Z
   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
   Name Server: UDNS1.ULTRADNS.NET
   Name Server: UDNS2.ULTRADNS.NET
   DNSSEC: unsigned
   URL of the ICANN Whois Inaccuracy Complaint Form: https://www.icann.org/wicf/
>>> Last update of whois database: 2026-10-02T10:28:28Z <<<

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

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