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Info by IP
infobyip.com โ€บ ipbulklookup.php
Domain and IP bulk lookup tool
Domain and IP bulk lookup tool allows to lookup domain, location, ISP and ASN for multiple hosts (IPs or domains) at once. It also supports lookup of MX or NS DNS records for multiple domains.
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Bulk Seo Tools
bulkseotools.com โ€บ bulk-whois-lookup.php
Bulk Whois Lookup. Bulk Whois Checker | Bulk Seo Tools
This nifty tool helps you perform a bulk Whois lookup all in one easy and simple step. To domain name search Whois records just enter up to 500 domains into this tool and you'll get all the Whois information in return.
Discussions

Free/Cheap way to check WHOIS INFO in bulk?
Myaddr https://whois.my-addr.com/ Cheapest API I've found in years. More on reddit.com
๐ŸŒ r/bigseo
24
9
August 25, 2019
Any legit way to do mass scripted whois queries?
If you are only looking for carrier (which can be mapped to AS an ASNAME) you can use the IP-to-ASN mapping services of team cymru. This is not as specific as WHOIS information regarding potential subcarriers with provider assigned IP addresses and such, but might be close enough. http://www.team-cymru.com/IP-ASN-mapping.html From here you can basically do bulk lookup of multiple IP addresses to ASNAME using either whois, netcat or even DNS. More on reddit.com
๐ŸŒ r/networking
14
7
September 21, 2018
is there a bulk domain lookup that doesn't suck?
domainbulker.com allows up to 5k domains per search. More on reddit.com
๐ŸŒ r/Domains
16
2
October 1, 2023
Free Whois API

Is that you, Cogent?

More on reddit.com
๐ŸŒ r/sysadmin
5
3
May 26, 2018
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WhoisXML API
whois.whoisxmlapi.com โ€บ bulk-whois-lookup
Bulk WHOIS Lookup of 500K domains simultaneously | WhoisXML API
Bulk WHOIS Lookup enables you to collect extensive domain intelligence for a large list of domain names in one query. Get started with 500 free queries.
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Domaintools
research.domaintools.com โ€บ bulk-parsed-whois
Bulk Parsed Whois - DomainTools
Bulk Parsed Whois lookup delivers a .csv file with parsed Whois records for up to 2,000 domains at a time.
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MxToolBox
mxtoolbox.com โ€บ BulkLookup.aspx
Bulk Lookup Tool - Bulk IP and Domain Lookup Tool - MxToolBox
Signup for a Free MxToolbox account to run Free Bulk Lookups for MX, A, DNS, Geo, ASN, SPF & More Signup
Find elsewhere
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ICANN
lookup.icann.org
ICANN Lookup
The ICANN registration data lookup tool gives you the ability to look up the current registration data for domain names and Internet number resources.
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WhoisXML API
whois.whoisxmlapi.com โ€บ bulk-api
Bulk WHOIS API | Easy Access to Bulk WHOIS Data | WhoisXML API
Website Categorization Lookup Domain Reputation Lookup Brand Alert Lookup Registrant Alert Lookup Email Verification Lookup Bulk Email Verification Lookup Threat Intelligence Lookup ยท MAC Address Lookup Screenshot Lookup SSL Certificates Lookup ยท 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. Reverse WHOIS Search WHOIS History Search WHOIS Search Reverse DNS Search Domain Availability Check Domains & Subdomains Discovery
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GoDaddy
godaddy.com โ€บ whois
WHOIS Domain Lookup - Find out who owns a website - GoDaddy
To use the GoDaddy WHOIS lookup tool, just enter the domain name whose information youโ€™d like to view into the search field on the WHOIS main page. You can retrieve key data about a domain in this way, including availability, domain owner lookup, and creation and expiration details.
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Online DNS Tools
onlinednslookup.com โ€บ bulk-domain-whois
Bulk Domain Whois
This tool performs bulk whois lookups for up to 10000 domain names at a time. It allows users to export the gathered data, including details like name servers, creation dates, expiration dates, owner information, and registrar details, into CSV or JSON format
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TheDomainRobot.com
thedomainrobot.com โ€บ blog โ€บ whois-domain-lookup-tools
The Best Free WHOIS Domain Lookup Tools In 2024
January 28, 2024 - WhoisXMLAPIโ€™s Bulk WHOIS Lookup is a service that allows users to perform WHOIS queries on multiple domain names simultaneously.
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WHOXY
whoxy.com
WHOIS API | WHOIS Lookup API | Domain WHOIS API
With support for 1595 TLDs, our cloud-based API lets you quickly access any domain's WHOIS data through Bulk Whois Lookup, Newly Registered Domains, Dropped Deleted Domains, Expiring Domains and Whois Database Download.
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WhoAPI
whoapi.com โ€บ home โ€บ bulk whois lookup: tools and apis
Bulk WHOIS Lookup: Tools and APIs - WhoAPI Inc.
April 20, 2024 - WHOIS is a system that provides information about registered domain names, including the domainโ€™s owner, registration date, and contact information. Using a bulk whois lookup is essentially doing thousands of these whois checks at once.
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URLVoid
urlvoid.com โ€บ whois-lookup
Free Whois Lookup Online, Domain Whois Lookup | URLVoid
With this online whois lookup tool you can get information about a domain name (e.g. google.com) or and IP address. You can view the domain registrar, the domain creation date, the owner location, and much more.
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Whoisfreaks
whoisfreaks.com โ€บ tools โ€บ whois โ€บ bulk โ€บ lookup
Bulk Domain Whois Lookup - WhoisFreaks
Explore the power of our Bulk Whois Checker tool by effortlessly examining up to 100 domain names at once. Alternatively, streamline your process by uploading a file containing 3 million domains for comprehensive bulk domain whois analysis.
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WhoisFreaks
whoisfreaks.com โ€บ tools โ€บ whois โ€บ lookup
Domain WHOIS Lookup Tool - Fast & Accurate | WhoisFreaks
February 12, 2025 - Yes, WhoisFreaks supports bulk lookups for users who need to analyze multiple domains at once.
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ARIN
arin.net โ€บ reference โ€บ research โ€บ bulkwhois
Bulk Whois Data - American Registry for Internet Numbers
ARIN provides access to a bulk copy of all objects in the public ARIN Whois directory service to organizations that will use the data for Internet operational or technical research purposes.
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GitHub
github.com โ€บ lbirchler โ€บ whois
GitHub - lbirchler/whois: Fast bulk WHOIS lookup
$ csvtool head 1 whois.csv | tr -s ',' '\n' query domainName registryDomainId registrarWhoisServer updatedDate creationDate registryExpiryDate registrar registrarIANAId domainStatus registrantOrganization registrantStateProvince registrantCountry registrantEmail adminEmail techEmail nameServer dnsSec billingEmail registrarAbuseContactEmail registrarAbuseContactPhone
Starred by 6 users
Forked by 2 users
Languages ย  Go
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IPinfo
ipinfo.io โ€บ blog โ€บ bulk-ip-lookups
Bulk IP Lookups With IPinfo API | IPinfo.io
January 13, 2017 - You can use our batch API to lookup detailed for up to 100 IPs in a single request. If you want to lookup thousands of IPs rather than hundreds of thousands it's probably simpler to just call our normal API for each of the IPs using some common ...
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Jsonwhois
jsonwhois.com โ€บ bulk-whois
Bulk WHOIS - Check WHOIS records in bulk with JsonWHOIS
Bulk WHOIS allows users to obtain the WHOIS records of several domains at once through a bulk domain lookup.