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- Last Review: May 4, 2016
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Pro > Technical Details > Whois Tool
Whois Tool Description - Lookup the Ownership of Domain Names, IPv4 or IPv6 Addresses and ASNs
The Whois Tool is a client utility that communicates
with WHOIS database servers located around the world to obtain domain
registration and IPv4 or IPv6 address assignment information and
also ASN (autonomous system numbers) ownership. The Whois
tool automatically selects the correct whois server using a
technique we first introduced in NetScanTools 3.1 in 1998.
Types of information often received from whois/rwhois
servers include: names, mailing addresses, telephone/fax numbers
and email addresses of registrant (owners), administrative and technical
contacts. Information quality and quantity varies depending on the
Use Whois and rwhois to get contact information
of the responsible parties for IPv4 or IPv6 addresses and domain names.
Whois Client Tool Capabilities: Domains, IPv4, IPv6 and ASN
- Support for over 100 domain extensions
and automatically follows referral whois queries for .com/.net
- Supports IPv4 address queries for
all IPv4 addresses and automatically selects the appropriate
whois server. The tool can optionally resolve the IP address
to find the domain name associated with that address, then it
can do a whois query on that domain for additional information.
- Supports IPv6 global address queries and ASN queries.
- IPv4 and IPv6 hostname to IP
resolution is done for domains and www. + domain name.
- rwhois is also fully supported. Our
rwhois client follows each referral server as they are found.
- Manual whois query mode is supported
where you enter the whois server to use.
- IP to Country Mapping is displayed
for an IPv4 address resolved from the domain name or entered
as an IPv4 address query.
- Abuse.net email contact information
is displayed for all domains entered or resolved from an IPv4
- SPF (Sender Policy Framework) records
are retrieved for all domains entered or resolved from an IPv4
- Bulk (Batch) whois queries are supported.
You can create or import lists of domains and IP addresses to
feed to the whois query engine (screenshot of editor is below).
Note: if you do too many whois queries to a single server in
a time period defined by the server management, your IP address
may be temporarily or even permanently blacklisted. Please follow
the whois server access rules as defined by each whois server
Screenshots - IPv4 query results (more images
Screenshots - domain query results...
Screenshot of Multi-Domain Whois Selector