IANA manages DNS root zone assignments and other internet numbering and protocol registries.
IANA — Root Zone Database
IANA Root Zone Database lists delegation details for top-level domains in the DNS root.
About IANA — Root Zone Database
The IANA Root Zone Database records the delegation details of top-level domains in the DNS root zone. It covers generic top-level domains such as .com and country-code top-level domains such as .uk. IANA states that it manages the DNS root zone and coordinates these delegations under its policies and procedures.
The homepage shows a table for each top-level domain with its type (for example generic, country-code, sponsored or infrastructure) and the organization that manages it. Where no manager has been assigned, the table reads "Not assigned." Much of the same data is also available through the WHOIS protocol at whois.iana.org.
Key features
- Lists delegation details for top-level domains in the DNS root zone
- Shows each top-level domain's type, such as generic or country-code
- Names the organization that manages each top-level domain
- Marks top-level domains with no assigned manager as "Not assigned"
- Makes much of the data available through the WHOIS protocol at whois.iana.org
Best for: People who need to check which organization manages a particular top-level domain, or whether it is a generic or country-code domain.
Good for
- Presents delegation data from the body that manages the DNS root zone
- Provides much of the same data through the WHOIS protocol
Watch out for
- Some top-level domains have no manager listed, shown as "Not assigned"
IANA — Root Zone Database at a glance
- Website
- iana.org/domains/root/db
- Category
- Development › Domain, IP & DNS Lookup
- Type
- Website
- Pricing
- Not confirmed. Check the site
- Platforms
- Web
- Open source
- Not stated
- Last checked
- Oct 6, 2026 · Online when checked
- Listed
- Oct 5, 2026
IANA — Root Zone Database alternatives
Tools and sites you could use instead, ranked by how closely they match.
Network Entity Reputation Database lets users search IP details and reputation information through its interface.
Domainr searches domain names and provides an API covering top-level domains.
Whoxy provides a WHOIS API for looking up domain registration records from a database of historical records.
Paid
24 alternatives
Check domain registration details and availability with Whois.com, which also sells domain names and hosting.
Paid
24 alternatives
Google Transparency Report publishes data about requests and activity affecting Google services.
Pick
24 alternativesPopular in Domain, IP & DNS Lookup
Well-known listings from the same topic.
Cloudflare DNScloudflare.com/application-services/products/dnsNetlas:netlas.ioIWantMyNameiwantmyname.comRDAPclient.rdap.orgIPIP.NETwhois.ipip.netInstantDomaininstantdomainsearch.com
IANA — Root Zone Database FAQ
Which kinds of top-level domains are included?
The database includes generic top-level domains such as .com and country-code top-level domains such as .uk. The homepage excerpt also lists sponsored and infrastructure types, such as .aero and .arpa.
Can the data be queried over WHOIS?
Yes. IANA states that much of this data is available via the WHOIS protocol at whois.iana.org.
Is something wrong or out of date?
Tell us and an editor will check it.
Own this website?
Claim this listing
Claim the listing and suggest updates yourself. An editor checks every claim first.