Bulk Email Address Verification Tool | WhoisXML API
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WHOIS / WHOIS History
WHOIS / WHOIS History

Provide current and historical ownership information on domains / IPs. Identify all connections between domains, registrants, registrars, and DNS servers.

DNS / DNS History
DNS / DNS History

Look into all current and historical DNS / IP connections between domains and A, MX, NS, and other records. Monitor suspicious changes to DNS records.

IP Geolocation / IP Netblocks
IP Geolocation / IP Netblocks

Get detailed context on an IP address, including its user’s geolocation, time zone, connected domains, connection type, IP range, ASN, and other network ownership details.

Domain Research Suite (DRS)
Domain Research Suite (DRS)

Access our web-based solution to dig into and monitor all domain events of interest.

Domain Research Suite (DRS)
Domain Research Suite (DRS)

Get access to a web-based enterprise-grade solution to search and monitor domain registrations and ownership details for branded terms, fuzzy matches, registrants of interest, and more.

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Predictive Threat Intelligence Feeds
Predictive Threat Intelligence Feeds

Predictive threat intelligence is your best first line of defense. Subscribe to the feeds to strengthen your cybersecurity posture. Contact us today for more information.

WhoisXML API Internet Infrastructure
Internet Infrastructure

Unlock integrated intelligence on Internet properties and their ownership, infrastructure, and other attributes.

Enterprise API Packages
Enterprise API Packages

Our complete set of domain, IP, and DNS intelligence available via API calls as an annual subscription with predictable pricing.

Security Intelligence (SI) Suite
Security Intelligence (SI) Suite

Offers complete access to WHOIS, IP, DNS, and subdomain data for product enrichment, threat hunting and more.

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MCP Server

Talk to our APIs using LLMs. Connect your preferred LLM to WhoisXML API and simply chat about WHOIS, DNS, threat intelligence, and more.

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#1 Bulk Email Verification tool to validate thousands of emails at once

Verify the validity and existence of up to 50,000 email addresses in one go with our bulk email validation tool.

Email Verification Bulk GUI

Easy bulk email validation API calls to verify that:

  • Convenient and hassle-free

    There’s no need to validate email addresses one by one with our bulk email verification tool. You can upload up to 50,000 email addresses in one go, saving you time and effort.

  • Easy-to-use GUI

    Our bulk email validation tool is not complicated. Simply upload your email list in CSV format and download the result in CSV, XML, or JSON formal—whichever suits you.

  • Precise and comprehensive email cleansing

    The bulk email verification tool can detect email addresses from over 2,000 disposable email providers aside from checking for syntax, mail server & mailbox existence, if catch-all, and if coming from a free email service provider.

Practical usage

Improve email marketing metrics

Improve email marketing metrics

Make it a habit to run your email marketing list through our bulk email verification tool to ensure that it is clean and free from invalid and nonexistent email addresses. The tool detects syntax errors and disposable email domains, which can drastically affect crucial email marketing metrics, such as open and bounce rates. By cleaning your email list, you can improve these metrics.

Minimize faulty signups and increase earning potential

Monitor your subscriber list for faulty signups using our bulk email validation tool. Abusive users may use invalid or disposable email addresses to take advantage of freemium features without the intention of upgrading their accounts. Legitimate users could also mistype their email addresses, making password resets and general communications difficult.

Minimize faulty signups and increase earning potential
Boost threat hunting capabilities

Boost threat hunting capabilities

Make email validation part of your cybersecurity best practices and detect threat actors who often use invalid and disposable email addresses to ensure anonymity when they launch spam and phishing campaigns.

Email Verification Bulk Lookup | WhoisXML API

Check our Bulk Email Verification API

Upload up to 50,000 email addresses via API call to get a verification request ID. Use this ID to check the status of your request and download the results.

Learn more about API integration

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