Lookalike Domain Detector

Attackers can register domains that look like yours and use them for phishing, invoice fraud, or credential theft. Enter your domain to find registered lookalikes, exposed infrastructure, and high-risk names.

What Is a Lookalike Domain Detector?

A lookalike domain detector finds Internet domains that resemble a legitimate domain or brand. These names may use misspellings, extra words, different top-level domains, Unicode characters, or a trusted brand name placed inside a misleading subdomain.

The detector creates spelling and character variations of the domain you enter. It also searches public certificate transparency logs for brand-related hostnames that a permutation list cannot generate, including combination domains and brand-as-subdomain patterns.

IT administrators use the results to review registrations near their domain portfolio. Security teams use them to prioritize phishing and impersonation investigations. Brand, fraud, and legal teams can use the same evidence when deciding whether a domain needs defensive registration, monitoring, or takedown action.

Lookalike candidates

sendmarc.comYour domain

ssendmarc.comTyposquat

sendrnarc.comHomoglyph

sendmarc-secure.comCombosquat

sendmarc.netTLD swap

sendmarc.com.verify-login.netBrand subdomain

Why Lookalike Domains Matter

A near-match passes a glance

A convincing lookalike can pass a quick visual check in an inbox, login page, invoice, or support message. The attacker does not need access to your DNS. A separate registration gives them infrastructure they can control.

DMARC cannot reach another domain

DMARC protects the authenticated domains you own. It cannot apply policy to a different domain registered by someone else, even when that name is almost identical to yours. Lookalike detection covers that visibility gap by showing security teams where impersonation infrastructure may exist outside the organization’s domain portfolio.

Manual checking does not scale

The operational problem is volume. Manually testing thousands of spelling variations, certificate records, mail servers, and nameservers creates work that most IT and security teams cannot repeat consistently. A ranked result set helps them focus on domains with live mail, recent certificates, copied infrastructure, or coordinated registration patterns.

Support for risk and audit programs

For organizations working under the Payment Card Industry Data Security Standard (PCI DSS), General Data Protection Regulation (GDPR), Protection of Personal Information Act (POPIA), or ISO/IEC 27001, lookalike detection can support broader phishing, fraud, and risk-management safeguards. The detector does not make an organization compliant and does not replace the controls required by any framework.

How Lookalike Domain Detection Works

The tool then checks Domain Name System (DNS) records, mail exchange (MX) records, Domain-based Message Authentication, Reporting, and Conformance (DMARC) policy, nameservers, certificate history, and Registration Data Access Protocol (RDAP) availability signals. It combines those facts into a risk level without claiming that every registered lookalike is malicious.

Generate variations

Spelling, keyboard, character, word, and top-level domain permutations of the domain you enter.

Search certificate logs

Public certificate transparency records surface brand hostnames that a permutation list cannot produce.

Verify live signals

DNS, MX, DMARC, nameserver, certificate, parking, and RDAP checks show what each candidate does today.

What the Detector Shows You

Generate variations

Spelling, keyboard, character, word, and top-level domain permutations of the domain you enter.

Lookalike candidates

sendmarc.comYour domain

ssendmarc.comTyposquat

sendrnarc.comHomoglyph

sendmarc-secure.comCombosquat

sendmarc.netTLD swap

sendmarc.com.verify-login.netBrand subdomain

Highest-risk names first, with the evidence behind each score

Results are ordered by the signals above rather than alphabetically, so live mail, weak DMARC policy, and recent certificate activity surface before dormant registrations.

Scan results

ssendmarc.comCritical

Live mail · No DMARC

sendrnarc.comHigh

New cert

sendmarc.netMedium

Parked

Email capability and DMARC posture

MXLive mail

aspmx.l.google.com

DMARCMissing

DMARC cannot reach another domain

PolicyNo coverage

Policy on sendmarc.com does not apply

Defensive registration candidates

High-risk generated variants that do not resolve and whose availability can be checked through RDAP before registration is suggested.

Defensive registration candidates

endmarc.comAvailable

sendmarc.aeCheck registry

account-sendmarc.comAvailable

Signals Returned

Domain and display form

The registered or certificate-observed hostname, with Unicode and punycode forms shown where relevant.

Discovery source

Whether the detector generated the name or found it in public certificate transparency records.

Lookalike technique

The variation class, such as a typo, homoglyph, combination word, top-level domain change, or brand-as-subdomain pattern.

Email capability and DMARC posture

Whether the domain publishes MX records and whether its DMARC policy is missing, none, quarantine, or reject. Registrar-default mail on parked domains is separated from active mail capability.

Website and registration evidence

Whether the name resolves to an IP address, has delegated nameservers, or appears only in historical certificate data.

Certificate history

The earliest public certificate date available from certificate transparency, including a New label for recently observed names.

Risk level

Critical, high, medium, or low based on mail capability, DMARC posture, certificate use, lookalike technique, domain age, parking, and infrastructure overlap.

Ownership and campaign context

Likely yours, parked, same mail provider, copied SPF, shared infrastructure, and coordinated registration-window indicators when the evidence supports them.

Defensive registration candidates

High-risk generated variants that do not resolve and whose availability can be checked through RDAP before registration is suggested.

How to Use the Lookalike Domain Detector

Enter your domain. Type the name people expect. Skip https and any page path.

Wait for both scans. Generated names appear first. Certificate results join the same table.

Review critical and high risk first. Start with live mail, weak DMARC, new certificates, or a close visual match.

Confirm Likely yours. Hide those rows to focus on threats, or leave them visible to check the label.

Choose a next step. Investigate live names, register available ones, or start a takedown.

Lookalike Domain Detector FAQs

What is a lookalike domain?

A lookalike domain is a separate Internet domain designed or configured to resemble a legitimate domain, organization, or brand. It may contain a typo, substituted character, extra word, different top-level domain, or misleading subdomain.

How does the lookalike domain detector find domains?

The lookalike domain detector generates spelling, keyboard, character, word, and top-level domain variations. It also searches certificate transparency records, then checks DNS, MX, DMARC, nameserver, certificate, parking, and RDAP signals where available.

What is certificate transparency in a lookalike domain scan?

Certificate transparency in a lookalike domain scan is the use of public logs that record issued TLS certificates. These logs can reveal brand-related hostnames that were configured for encrypted web traffic, including names that a spelling-permutation engine would not create.

Does DMARC stop lookalike domains?

DMARC does not stop lookalike domains because DMARC policy applies to the authenticated domain that publishes it. A separately registered lookalike domain controls its own DNS and requires separate detection, investigation, and remediation.

What do the detector’s risk levels mean?

The detector’s risk levels rank technical evidence from critical to low. Live mail, missing or weak DMARC policy, close visual similarity, recent certificates, copied infrastructure, and coordinated registrations can raise risk, while parking or likely common ownership can lower it.

Why does a result say Likely yours?

A result says Likely yours when the candidate uses the same distinctive nameserver infrastructure as the domain that was scanned. This is an ownership clue, not proof, so the organization should confirm the domain before excluding it from review.

Can a lookalike domain detector prove that a domain is malicious?

A lookalike domain detector cannot prove that a domain is malicious from registration and infrastructure signals alone. The results identify domains that warrant review; proof of abuse may require website content, email samples, hosting evidence, or confirmed victim activity.

How often should I scan for lookalike domains?

A lookalike domain scan is a point-in-time check, so it should be repeated whenever the organization launches a brand, changes a high-value domain, investigates impersonation, or reviews exposure. Recurring scanning is needed when the team wants alerts for new registrations and changes between manual checks.

Lookalike Domain Resources

Lookalike Domain Defense

Domain Spoofing Explained

Turn Lookalike Findings Into Action

The free detector shows what exists now. Book a demo to discuss Lookalike Domain Scanning, alerts, defensive registration, and takedown support alongside DMARC Management.

Recurring scanning

Detection runs on a schedule instead of only when somebody remembers to check.

Defensive registration

Takedown support

Escalate confirmed impersonation with the hosting, registrar, and certificate evidence attached.

Book a demo

Lookalike Domain Scanning

New lookalike registeredAlert sent

MX record added to a known lookalikeEscalated

Takedown requestedIn progress