Reverse NS Lookup is a reverse nameserver lookup tool | WhoisXML API
Products APIs Data Feeds Web Tools Domain Research & Monitoring Enterprise Packages Cyber Threat Intelligence Services
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.

Research
Monitoring
White-Label
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.

Premium API Services
Premium API Services

Enjoy priority data access with our premium API services topped with extra perks including dedicated team support, enterprise-grade infrastructure, and SLAs for full scalability and high performance.

Threat Intelligence Analysis
Threat Intelligence Analysis

Carry a complete threat intelligence analysis for a given domain or IP address and get access to a report covering 120+ parameters including IP resolutions, website analysis, SSL vulnerabilities, malware detection, domain ownership, mail servers, name servers, and more.

Threat Intelligence APIs
Threat Intelligence APIs

Gather threat intelligence via API calls covering Domain’s Infrastructure analysis, SSL Certificates Chain, SSL Configuration Analysis, Domain Malware Check, Connected Domains, and Domain Reputation Scoring.

Threat Intelligence Data Feeds
Threat Intelligence Data Feeds

Bolster enterprise security with our feeds covering Typosquatting domains, Disposable domains, Phishing URLs, Domain & IP reputation, Malicious URLs, Botnet C&C, and DDoS URLs.

Custom development

We offer comprehensive services for the integration of our data – from consultations to the precise definition of the basic needs of the business to increase the work efficiency.

Registrar WHOIS Services

Set up and manage public WHOIS servers for your business. Our WHOIS parsing system is a utility that collects extensive information about any given domain by sending series of DNS and WHOIS queries. The report is generated in raw as well as in parsed format.

Support services

Regardless of whether you are a startup, a small business or a global one, our team is always ready to help you. Enterprises operating on a scale can also choose special premium support management with high priority 24/7 email and telephone responses and other professional services.

Internet Statistics Reports

Get customized reports on TLDs covering datasets falling under domain name, WHOIS and DNS category.

×
Contact Us
Pricing Blog

Reverse NS Lookup: Determine which domains share the same name server

Get a list of domain names that share a name server for cybersecurity, marketing, and IT purposes. Test our Reverse NS Lookup now. Download our product sheet to learn more.

4.2 Billion+Domains and subdomains
BillionsNS records
52,000+Satisfied customers
11+Years of data crawling

What is a reverse nameserver lookup?

A reverse nameserver lookup, also referred to as a reverse NS lookup, is a search for all of the domain names that share a nameserver specified as a search term. A reverse namerserver lookup allows to understand if a nameserver is dedicated or shared among several hosts.

Why use our NS reverse lookup tool?

  • Exhaustive and regularly updated data

    Reverse NS Lookup’s outputs are accurate, comprehensive, and backed by our large DNS record database, with millions NS records updated every week.

  • Near-instantaneous NS lookup results

    Reverse NS Lookup’s reports are created in a matter of seconds and have shareable URLs for faster communication and decision-making.

Practical usage of a reverse nameserver lookup

Cybersecurity

Cybersecurity

  • Gather information about nameservers that have been compromised, added to a blacklist, or used as part of a cyberattack and report the connected domain names to their registrar or hosting company.
  • For each nameserver reported as an indicator of compromise (IoC), Reverse NS Lookup lists down all related domains that should be monitored and possibly added to blocklists.
  • If you are interested in investigating anonymous site visitors whose domains or IP addresses are privacy-protected, but you know their name server, you can do a reverse name server lookup to get to know them better.

SEO and marketing

  • Ensure that your domain doesn’t have a connection to a shady nameserver as that can land you on a blacklist and negatively impact your search engine ranking and brand reputation.
  • Use Reverse NS Lookup to see the latest domain additions to your competitors’ nameserver addresses, which may indicate future product launches and business expansions.
SEO and marketing
IT asset management

IT asset management

  • Study your DNS infrastructure with Reverse NS Lookup to understand which of your domain names are sharing a nameserver and decide whether to keep or change this setup.
  • Examine third parties’ nameserver addresses to gather a list of all domain name assets or map connections following a merger, acquisition, or partnership.
  • Dig deeper into the domains you’re sharing nameservers with to avoid bad online neighbors.

Frequently Asked Questions

  • What are NS records?

    An NS record specifies what DNS server is responsible for a given domain. It tells you which NS contains the actual DNS records of the domain of interest. In even simpler terms, an NS record tells Internet-connected systems where to go to find out what IP address corresponds to a specific domain.

  • Why should NS records be properly managed?

    NS record management is important as failure to do so can result in non-resolution (i.e., users can’t find your website). NS records must always be updated as well to ensure they point to the right pages. Threat actors may also try making unauthorized changes to these records to redirect your site visitors to malicious pages.

  • Are NS records and DNS zones connected?

    Yes, definitely. NS records can be used to identify your DNS zone. A DNS zone is that unique part of the DNS where your domain resides that is administered by a single manager. That manager could be a person, an organization, or a company who/that is responsible for maintaining the zone by maintaining control of its components, primarily authoritative NSs.

DNS Database Download

Complement nameserver data with information from the largest IP/DNS database

Uncover all historical associations between NS or other DNS records and domains or subdomains. Our data is well-parsed and complete with timestamps.

Order database