Narrow results by TLD (.com, .net, custom), domain length, and type (Pure Alpha, Pure Numeric, No Hyphen). Sort by shortest, longest, or alphabetical order.
See total domain count per nameserver, search by keyword within results, and export filtered lists to CSV for offline analysis.
WHOIS, DNS, IP Lookup and more to analyze a domain across multiple dimensions.
Frequently Asked Questions
How do I use DomainKits Reverse NS Lookup?
Type a nameserver (or a domain) into the search box above, to see the domains that share it. Narrow the list with filters for extension, type and length, then paste the second nameserver into Also on to keep only the domains that use both. Also on is available on Advanced and higher plans. The short video below walks through the five steps.
Clicking play loads the video from YouTube.
What is Reverse NS Lookup and how do I search domains on the same nameserver?
Reverse NS Lookup finds the domains that share a given nameserver. Enter a nameserver address (e.g., ns1.dan.com) and the tool returns the gTLD domains pointing to it. If you enter a domain instead, the tool looks up that domain's first nameserver for you.
What can I use Reverse NS Lookup for?
- Market research: see how many domains a DNS provider, registrar or parking service carries, and how they break down by extension, length and type.
- Security analysis: start from a suspicious domain, take its nameservers and review the other domains on them to spot related phishing or spam sites. Adding the second nameserver with Also on narrows the list to the domains on the same pair.
- Brand analysis: filter a nameserver's domains by your brand name to find lookalike registrations, or start from a copycat site to find more domains set up the same way.
What data does Reverse NS Lookup cover?
It covers gTLD domains: 250M+ domains across .com, .net, .org and the other generic extensions, organized by nameserver. Each result shows the domain's age and registration year, its other nameservers, and a Cross-TLD count of how many extensions the same name is registered in. In line with GDPR, we do not collect or share registrant data.