DNS Lookup API lets you check MX, NS, and other server records

A DNS lookup API call gives you a domain’s corresponding IP address from its A record as well as the domain’s mail server (MX record), nameserver (NS record), SPF (TXT record), and more records.

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500 free credits. No credit card required.

50 Billion+Domains and subdomains

116 Billion+DNS records

52,000+Satisfied customers

15+Years of data crawling

Benefits of our DNS server API

Insightful

Learn more about a domain’s owner from his available Domain Name System (DNS) information. Find the IP address, mail server, nameserver, and other DNS-related information of domains by letting DNS Lookup API gather A, mail exchanger (MX), NS, SPF/TXT, and other records.
Easy to use

DNS Lookup API is a RESTful API that can be easily integrated into pre-existing systems and processes. We also provide multiple client libraries with code samples for all commonly-used programming languages to speed up integration.

Practical usage of DNS API calls for MX, NS, and other server records

DDoS attack prevention

Even more violent than spam is the dreaded DDoS attack, which is basically a security attack on your website from dozens or even hundreds of IP address simultaneously. If you suddenly notice an unusual amount of traffic, then you may want to conduct a DNS lookup and get to the root of it before it becomes a problem, especially if the traffic is originating from a group of similar IP addresses.

Anti-Spam solutions

Better manage spam attacks from a given web server or IP address. When spammers attack your site repeatedly, you can obtain the attackers’ IP addresses via a DNS lookup tool and more information about the DNS infrastructure in use.

Penetration testing

Pen testers and researchers can use DNS data to expand their knowledge of an organization’s online properties. From there, they can begin to understand the bigger picture and reduce potential attack surfaces.

Study your competition

DNS entries can help you determine the companies that your competitors are currently working with and might be relevant for you to approach as part of your business development efforts.

All the insights of our DNS checker API are available in our comprehensive passive DNS database

Our database contains information on billions of domains and subdomains, enabling you to gather all available historical DNS data points you may be interested in.

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Kim Kok

Vice President

Core4ce

“We want to provide all Cyberscape users the ability to integrate relevant data for their cyber threat investigations. WhoisXML API provides unique data that will be helpful to the cyber threat investigation community, allowing analysts to shorten the cycle of understanding and mitigating threats.”

Michael Roberts

Founder & Private Investigator

Rexxfield

“WhoisXML was the game changer for us. It has revolutionized our ability to disrupt cybercrime in process and at scale by quickly identifying all of the vendors providing material support for scammers using sophisticated website templates that look legitimate. By quickly identifying the vendors unknowingly supporting the criminals, we can provide them with public interest justification to burn down the criminal infrastructure.”

WHOIS / WHOIS History

DNS / DNS History

IP Geolocation / IP Netblocks

Domain Research Suite (DRS)

Domain/WHOIS

DNS/IP

Intelligence

Other

Domain/WHOIS

DNS/IP

Intelligence

Other

Domain/WHOIS

DNS/IP

Intelligence

Other

Domain Research Suite (DRS)

Research

Monitoring

White-Label

Predictive Threat Intelligence Feeds

Internet Infrastructure

Enterprise API Packages

Security Intelligence (SI) Suite

DNS Lookup API lets you check MX, NS, and other server records

Benefits of our DNS server API

Insightful

Easy to use