osint.sh
OSINT.sh tool for checking historical DNS records and domain infrastructure changes.
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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.
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
OSINT.sh reverse domain lookup for finding related domains and infrastructure links.
osint.sh
OSINT.sh IP lookup for checking geolocation, ASN, network, and hosting information.
domainwat.ch
Domain monitoring tool for tracking DNS changes, records, and domain activity.
centralops.net
CentralOps collection of DNS, WHOIS, traceroute, email, and network lookup tools.
iplocation.net
IP Location is a web tool that checks a visitor's public IPv4 and IPv6 address and shows approximate IP geolocation, ISP, organization, ASN, time zone and privacy signals such as VPN, proxy or Tor status. It also offers an IP address lookup field and a bulk IP lookup option. Lookup data is provided by IP2Location.
osint.sh
OSINT.sh tool for finding domains and websites hosted on the same IP address.
osint.sh
OSINT.sh tool for detecting a website's technology stack, frameworks, and services.
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.
phonebook.cz
Phonebook.cz is a lookup tool from Intelligence X that lists domains, email addresses, or URLs for a given input domain. Access requires login through an intelx.io account and a paid license. The service states that it searches 313 billion records.
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.
osint.sh
OSINT.sh tool for discovering subdomains connected to a target domain.
webwhois.verisign.com
Verisign WHOIS lookup for checking domain registration records and registry information.
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.
dnsperf.com
A DNS speed benchmarking tool that performs an A record lookup for the apex domain name from more than 200 locations worldwide. The lookup time serves as a benchmark of DNS provider performance in different regions and allows debugging of self-hosted DNS servers and testing of routing logic. Test result retention is up to 30 days.
intelx.io
Intelligence X is a provider of free open source intelligence (OSINT) and forensic tools for investigations. Its toolset supports search across third-party sites, social media intelligence for Facebook, Twitter, LinkedIn, Telegram, and YouTube, and utilities for tasks including email validation, domain lookups, IP lookups, Bitcoin tracing, and image analysis. All listed OSINT and forensic tools are available to use at no cost.
internetdb.shodan.io
Shodan InternetDB lookup for checking open ports, vulnerabilities, tags, and host data by IP.
ipleak.net
IPLeak.net is a diagnostic page that shows the IP addresses, DNS resolvers, WebRTC and torrent address information a visitor's system exposes to websites. It also explains WebRTC and DNS leaks and lists request details such as user agent and headers.
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.
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.
remote.12dt.com
Remote DNS Lookup is a web tool for finding, checking, or analyzing online information related to domains, networks, and digital services.
osint.sh
Reverse WHOIS lookup for finding domains connected to the same registrant, email, or ownership details.