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What is WHOIS? An overview of the tool for obtaining information about domain owners

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WHOIS is a network protocol used to query databases containing registered users' domain names. WHOIS provides information about the domain owner, including contact details, registration dates, registration expiry, and registrar information. This protocol is an important tool for web administrators, legal services, cybersecurity researchers, and ordinary users who wish to learn more about a specific domain.
The WHOIS query process begins with entering the domain name into a special field on a website that supports the WHOIS protocol or through the command line using the appropriate client. After that, the query is sent to the database containing information about domains and returns the relevant data. In response to the query, one can obtain details such as the name and surname of the domain owner, their email address, phone number, and postal address. Additionally, one can find out when the domain was registered and when its registration expires, as well as who the domain registrar is.
In short:
WHOIS provides information about the domain owner (if the information is not hidden) and about the registration periods.
Example of a WHOIS response (with the owner's contact information hidden):
WHOIS : tseivo.com

   Domain Name: TSEIVO.COM
   Registry Domain ID: 2769889154_DOMAIN_COM-VRSN
   Registrar WHOIS Server: whois.namecheap.com
   Registrar URL: http://www.namecheap.com
   Updated Date: 2024-03-03T08:06:46Z
   Creation Date: 2023-04-02T16:54:11Z
   Registry Expiry Date: 2025-04-02T16:54:11Z
   Registrar: NameCheap, Inc.
   Registrar IANA ID: 1068
   Registrar Abuse Contact Email: [email protected]
   Registrar Abuse Contact Phone: +1.6613102107
   Domain Status: clientTransferProhibited https://icann.org/epp#clientTransferProhibited
   Name Server: GUSS.NS.CLOUDFLARE.COM
   Name Server: MIMI.NS.CLOUDFLARE.COM
   DNSSEC: unsigned
   URL of the ICANN Whois Inaccuracy Complaint Form: https://www.icann.org/wicf/
>>> Last update of whois database: 2024-07-25T07:24:08Z <<<

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
registrar's sponsorship of the domain name registration in the registry is
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.

TERMS OF USE: You are not authorized to access or query our Whois
database through the use of electronic processes that are high-volume and
automated except as reasonably necessary to register domain names or
modify existing registrations; the Data in VeriSign Global Registry
Services' ("VeriSign") Whois database is provided by VeriSign for
information purposes only, and to assist persons in obtaining information
about or related to a domain name registration record. VeriSign does not
guarantee its accuracy. By submitting a Whois query, you agree to abide
by the following terms of use: You agree that you may use this Data only
for lawful purposes and that under no circumstances will you use this Data
to: (1) allow, enable, or otherwise support the transmission of mass
unsolicited, commercial advertising or solicitations via e-mail, telephone,
or facsimile; or (2) enable high volume, automated, electronic processes
that apply to VeriSign (or its computer systems). The compilation,
repackaging, dissemination or other use of this Data is expressly
prohibited without the prior written consent of VeriSign. You agree not to
use electronic processes that are automated and high-volume to access or
query the Whois database except as reasonably necessary to register
domain names or modify existing registrations. VeriSign reserves the right
to restrict your access to the Whois database in its sole discretion to ensure
operational stability.  VeriSign may restrict or terminate your access to the
Whois database for failure to abide by these terms of use. VeriSign
reserves the right to modify these terms at any time.

The Registry database contains ONLY .COM, .NET, .EDU domains and
Registrars.
Domain name: tseivo.com
Registry Domain ID: 2769889154_DOMAIN_COM-VRSN
Registrar WHOIS Server: whois.namecheap.com
Registrar URL: http://www.namecheap.com
Updated Date: 2024-03-03T08:06:46.11Z
Creation Date: 2023-04-02T16:54:11.00Z
Registrar Registration Expiration Date: 2025-04-02T16:54:11.00Z
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
Registrant Organization: Privacy service provided by Withheld for Privacy ehf
Registrant Street: Kalkofnsvegur 2
Registrant City: Reykjavik
Registrant State/Province: Capital Region
Registrant Postal Code: 101
Registrant Country: IS
Registrant Phone: +354.4212434
Registrant Phone Ext:
Registrant Fax:
Registrant Fax Ext:
Registrant Email: [email protected]
Registry Admin ID:
Admin Name: Redacted for Privacy
Admin Organization: Privacy service provided by Withheld for Privacy ehf
Admin Street: Kalkofnsvegur 2
Admin City: Reykjavik
Admin State/Province: Capital Region
Admin Postal Code: 101
Admin Country: IS
Admin Phone: +354.4212434
Admin Phone Ext:
Admin Fax:
Admin Fax Ext:
Admin Email: [email protected]
Registry Tech ID:
Tech Name: Redacted for Privacy
Tech Organization: Privacy service provided by Withheld for Privacy ehf
Tech Street: Kalkofnsvegur 2
Tech City: Reykjavik
Tech State/Province: Capital Region
Tech Postal Code: 101
Tech Country: IS
Tech Phone: +354.4212434
Tech Phone Ext:
Tech Fax:
Tech Fax Ext:
Tech Email: [email protected]
Name Server: guss.ns.cloudflare.com
Name Server: mimi.ns.cloudflare.com
DNSSEC: unsigned
URL of the ICANN WHOIS Data Problem Reporting System: http://wdprs.internic.net/
>>> Last update of WHOIS database: 2024-07-25T00:24:43.23Z <<<
For more information on Whois status codes, please visit https://icann.org/epp
WHOIS has significant advantages in the field of security and domain management. It allows for quick identification of the domain owner in case of conflicts or violations, such as spam, phishing, or copyright infringement. Additionally, WHOIS helps ensure transparency and trust on the Internet by providing open access to important information about domains. However, it should be noted that some domain owners may use privacy services to hide their personal data from public access, which may limit the amount of available information (as seen in the example provided).
WHOIS information can also be exploited by malicious actors to track expired domains and acquire them.

Hidden WHOIS Information

To hide the domain owner's information in WHOIS query results, one can use privacy services offered by most domain registrars. These services allow replacing the domain owner's personal data with the contact information of a proxy company that will handle incoming queries directed to the domain owner. For example, instead of your email address and phone number, the WHOIS query results will display information about the company providing privacy services.
Using such services helps protect your personal information from spam, fraudsters, and unwanted contacts. Typically, this service is offered as an additional option during domain registration or can be added later through your domain management panel.
In the example, we can see "Registrar Abuse Contact Email: [email protected]" - this contact information is provided to reach the registrar in case of abuse or violations related to the domain. This record is displayed to ensure the possibility of contacting the registrar in case of illegal or wrongful activities related to the domain. Registrars are required to provide such information to ensure compliance with regulatory requirements and to maintain Internet security.
Using privacy services will help you hide personal data from public access, and the contact email for abuse reports provides a way to interact with the registrar if necessary.

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