DNS Lookup API | Whois XML API

Identify who is hosting a particular domain name or website

A domain has a number of records associated with it, and a DNS server can be queried to determine the IP address of the primary domain (A record), mail servers (MX records), DNS servers (NS nameservers) and other items, such as SPF records (TXT records). This is a REST API that performs DNS queries via simple HTTP requests, returning your results as JSON/XML-encoded objects.

Get started

500 free credits monthly. No credit card required.

1.2 billion+Domains and subdomains
142,703,533MX records updated daily
196,463,291NS records updated daily
99.5%IP addresses in use covered

Benefits

  • Displays the DNS information critical for identifying who is hosting a particular domain name or website.

  • Determines the Mail Servers for Particular Domain. Use this API to find out what server(s) accept email for a specific domain by doing an MX record lookup.

  • Determines the IP address of the primary domain (A record), mail servers (MX records), DNS servers (name servers) and other items such as SPF records (TXT records).

  • Determines the SPF record for a domain by looking up its TXT record to see if the domain tries to restrict who can send email using the domains.

Useful for detecting or dealing with cybercrime or network security issues.

Useful for detecting or dealing with cybercrime or network security issues.

DDoS attack prevention

Even more violent than spam is the dreaded DDoS attack, which is basically a security attack on your web site from dozens or even hundreds of IP address simultaneously. If you suddenly noticean unusual amount of traffic, then you may want to conduct areverse 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

Prevent spam attacks from aparticular web server or IP address. When your site is attacked by spam repeatedly, obtain the IP address(es) of the attackers and then use a reverse DNS lookup tool to obtain site registration informationof that IP address.

Penetration testing

Security penetration testers and researchers will use information collected from DNS to expand their knowledge of an organization’s information technology infrastructure and from that knowledge begin to understand the attack surface.

DNS Database Download

Get access to the biggest Passive DNS Database

The passive DNS database is a large Historic DNS repository with 2 billion hostnames and hundreds of billions of Historic DNS Lookups. Our comprehensive passive DNS database allows finding out all historical DNS data points for any hostname and ip address.

Request database
DNS Lookup API | Whois XML API

Get 500 free credits monthly. No credit card required.

Get started

Trusted by
the smartest
companies

You may be interested

Domain Availability
Domain Availability

The most accurate domain availability checker offered on the market.

Learn more
Threat Intelligence Data Feeds
Threat Intelligence Data Feeds

Get the most relevant data to be ahead of emerging security threats.

Learn more
Reverse IP/DNS
Reverse IP/DNS

Find relations like ownership between hostnames and IPs.

Learn more
Website Categorization
Website Categorization

Define website category of the given domain.

Learn more
Reverse NS
Reverse NS

Find all domains that use the same name server.

Learn more
Screenshot Service
Screenshot Service

Instantly get a screenshot of any web page.

Learn more
Typosquatting Data Feed
Typosquatting Data Feed

Easily detect all typosquatting domain names as soon as they are registered each day.

Learn more
Newly Registered Domains
Newly Registered Domains

Keep track of the best business opportunities online.

Learn more
Brand Alert
Brand Alert

Monitor exact matches, variations and common misspellings of your brand name & trademarks.

Learn more
IP Geolocation
IP Geolocation

Find out the exact physical location of any IP address, email or domain name.

Learn more
Registrant Alert
Registrant Alert

Find out which domains were added or dropped by registrants, with given search criteria.

Learn more
Domain Research Suite
Domain Research Suite

Enhance your domain research toolkit by our enterprise-grade web-based solution that helps you in searching...

Learn more
Website Contacts
Website Contacts

Get full contacts data of the given domain.

Learn more
Real-time Domain Registration
Real-time Domain Registration

Get data feeds of new registered domains along with their WHOIS data generated in real time.

Learn more
DNS Lookup Services
DNS Lookup Services

Identify who is hosting a particular domain name or website.

Learn more
IP Netblocks
IP Netblocks

Find out which IP range the particular IP belongs to.

Learn more
Reverse WHOIS
Reverse WHOIS

Find connections between various domains, individuals and organizations.

Learn more
Domain Reputation API
Domain Reputation API

Assess the domain's or IP addresses reputation and risk profile with a simple score based on a comprehensive...

Learn more
US Internet Retailers Database
US Internet Retailers Database

Get access to the biggest US Internet Retailers Database.

Learn more
WHOIS Search
WHOIS Search

Get well-parsed and normalized WHOIS information for any domain name, IP address or email.

Learn more
All Registered Domains
All Registered Domains

Get a complete daily list of all the registered domains and zone files.

Learn more
Email Verification
Email Verification

Ensure the validity and quality of any email address.

Learn more
Reverse MX
Reverse MX

Reveal all the domains that use the same mail server.

Learn more
WHOIS Database Download
WHOIS Database Download

We provide complete and relevant domain WHOIS data which can be customized and easily integrated as per your business needs.

Learn more

Enterprise API Packages

API access through WhoisXMLAPI can be purchased as an annual subscription. The access pricing is based on the number of queries, which is measured monthly with per-minute rate limits. The pricing structure gives predictability to business planning and solution architecture.

Learn more
Have questions?

We are here to listen. For a quick response, please select your request type or check our Contact us page for more information. By submitting a request, you agree to our Terms of Service and Privacy Policy.

Or shoot us an email to