webwhois.verisign.com
Verisign WHOIS lookup for checking domain registration records and registry information.
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osint.sh
OSINT.sh tool for checking historical WHOIS records and domain ownership changes.
who.is
Who.is is a domain and IP information lookup service. It offers WHOIS and RDAP lookups, DNS records, nameserver lookup, IP address lookup, domain history and uptime checks. Premium offerings include downloadable domain history reports, website monitoring for up to 10 domains and API access providing parsed WHOIS, RDAP, DNS and TLS certificate data as JSON over HTTPS, with a free tier.
osint.sh
Reverse WHOIS lookup for finding domains connected to the same registrant, email, or ownership details.
one-plus.github.io
OSINT Toolkit Website Information is a collection of tools for researching websites, IP addresses, domains, emails and MAC addresses. It lists lookups including Ping Website, Whois, reverse Whois, network and TLD lookup, IP history and geolocation, MAC vendor lookup, DNS report and header and source code search. The page states that some tools require the IP address, email address, domain name or MAC address of the target.
website.informer.com
Website.informer offers a free aggregated report on any domain, including WHOIS, visitors, IP and DNS details, competitors, and owners. It provides website statistics such as daily visitors, safety status, and global rank, plus competitor and similar-site research. It also offers IP and DNS lookup, WHOIS records, a browser extension for website analysis and security checks, and email-to-domain matching from WHOIS data.
whoxy.com
Whoxy is a hosted web service that returns parsed WHOIS fields to applications in XML or JSON format over HTTP requests. It follows WHOIS registry referral chains to find the correct servers, and supports 2026 domain extensions including gTLDs and ccTLDs. The page notes a free account signup and query pricing by volume.
osint.sh
OSINT.SH is a collection of information gathering tools. It lists tools for finding public cloud buckets, subdomains, DNS history, reverse IP lookups, technology detection, certificate searches, DNS lookups, reverse Google Analytics and AdSense IDs, WHOIS history, reverse WHOIS, reverse domain searches, OCR text extraction, MD5 hash guessing, SSL checking, IP geolocation, and reverse MX and name server records.
whoismind.com
WhoIsMind offers a free IP address lookup tool that reports an IP address's location, ISP, ASN and domain information. The site also explains reverse IP lookups, which return the hostname or domain associated with an IP address via PTR records, and discusses public, private, static and dynamic IP address types.
centralops.net
CentralOps collection of DNS, WHOIS, traceroute, email, and network lookup tools.
dnslytics.com
DNSlytics is an online investigation tool for viewing information about IP addresses, domain names and providers. It offers DNS lookups, email testing, WHOIS lookups, and reports on AS/BGP, CIDR and TLD data. Premium website access and a premium API provide additional page views, monitors and data.
client.rdap.org
RDAP Lookup is a private lookup tool for domain names, IP addresses and Autonomous System Numbers using RDAP, the replacement for Whois. The browser connects directly to the relevant registry's RDAP server over encrypted HTTPS. An optional setting follows the referral to the registrar's RDAP record. The page notes that all generic TLDs support RDAP while only a few ccTLDs have deployed it.
robtex.com
Robtex offers free DNS lookup and network intelligence. It gathers public information about IP numbers, domain names, host names, autonomous systems and routes, indexes it in a database, and provides lookup tools including reverse DNS, Whois and AS macros.
domainbigdata.com
Domain intelligence tool for researching WHOIS data, ownership patterns, and connected domains.
github.com
Awesome CSEs is a public GitHub repository that hosts a list of custom browser search engine configurations and shortcuts. It is designed to improve daily workflow by replacing Chrome's default long, hard-to-trigger custom search engine keywords with short, memorable alternatives. The list includes provided shortcuts for services including Gmail, GitHub, Amazon, Airbnb, reference sites, and specialized tools like filming location and whois lookups, reducing the number of keystrokes needed to access targeted search results directly.
dnsai.com
DNSai is a collection of DNS and email security tools on one page. It covers DNS record lookups, WHOIS, blacklist checks, SPF, DKIM and DMARC builders and validators, email header analysis and bulk domain scanning. The tools return plain-English AI summaries, and each is available through an API and MCP connectors.
whois.domaintools.com
Domain Tools is a web tool for finding, checking, or analyzing online information related to domains, networks, and digital services.
lookup.icann.org
The site allows you to look up domain registration information (WHOIS) on the internet
aware-online.com
A page listing third-party links and tools for investigations on websites and domain names. Entries cover WHOIS lookups, DNS history, SSL certificates, subdomain finding, open ports, archived information and source code investigations, with notes on whether a paid account is needed.
packet.guru
packet.guru is a public website offering browser privacy and network diagnostic tools. It checks user IP and location, provides Privacy and Trust scores, free DNS, WebRTC and browser-fingerprint leak tests, plus 25 network tools. The tool suite is organized into Network, DNS, WEB and Utility categories for professional use, with tools including ping, traceroute, whois, DNS lookup, URL encoder/decoder, HTTP header checks and base64 encode/decode functions.
viewdns.info
ViewDNS.info is a site offering free DNS and IP tools, including Reverse IP Lookup, WHOIS, DNS Records, Subdomain Finder, Port Scanner, IP Location and DNS Propagation Checker. It also provides API documentation for domain, IP and network intelligence, with a Sandbox plan of 250 free trial queries and paid plans from $49 per month for 2,500 monthly queries.
aware-online.com
A custom OSINT tool from Aware Online Academy for investigating a target website. It provides scripts to view historical WHOIS data, check website text and source code on third-party sites, visualise links, map web pages, check Reddit presence, find open FTP ports and find other top level domains.