DNSWatch offers DNS lookup and reverse DNS lookup tools with exact performance measuring and DNS server monitoring. It also provides RBL email blacklist lookup and IP location lookup. Paid products include DNS performance monitoring starting at $1 per month, mailserver blacklist monitoring starting at $3.5 per month, and a DNS changetracker starting at $7.9 per month. The site is free to use with ads.
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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.
CentralOps collection of DNS, WHOIS, traceroute, email, and network lookup tools.
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.
The Microsoft Error Lookup Tool displays the message text associated with a hexadecimal status code or other code. The text is defined in Microsoft source-code header files such as Winerror.h and Setupapi.h. The tool is digitally signed by Microsoft and is described as a point-in-time tool that decodes most Microsoft error codes as of its compilation date.
PCI Lookup is a tool intended to help users find vendor and device descriptions needed to obtain drivers for a PC. It provides guidance on finding vendor and device IDs in Windows and lists walkthroughs for Debian and Red Hat Enterprise Support. The site mentions donations to expand functionality.
IP Lookup at ifconfig.me displays the visitor's IP address along with connection details such as user agent, language, referer, method, encoding, MIME type, charset and X-Forwarded-For. It also offers a command line interface for retrieving this information via curl.
Leak Lookup is a data breach search engine for searching database leaks and dumps. It offers username, email and IP address lookups across thousands of breaches to help track credentials compromised in the wild. A hash API provides hash-cracking capabilities and an API key is required to make requests.
RSS Lookup is an RSS or feed tool for discovering, reading, filtering, or managing web updates.
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.
Intelligence X provides free open source intelligence tools for investigations. The tools search third party sites and perform social media intelligence on Facebook, Twitter, LinkedIn, Telegram and YouTube, alongside email and domain validation and lookup links.
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.
MAC Address looks up MAC address vendors and device manufacturer information.
Remote DNS Lookup is a web tool for finding, checking, or analyzing online information related to domains, networks, and digital services.
Scamalytics provides IP address fraud risk lookup tools for businesses to detect fraud, safeguard users and protect revenues. Its IP Address Fraud Check returns a fraud risk score and indicates whether an IP is running a proxy server, with an API and bulk lookup available. A free tier and 15 day trial are offered, and pricing is monthly based on an allowance of lookups.
Technology lookup tool that reveals frameworks, platforms, and services used to build websites.
Collection of online network tools for DNS, IP lookup, email checks, and security research.
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.
OSINT phone search hub with links and utilities for researching phone numbers across public lookup services.
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 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.
WhatsMyDNS is a free online tool for performing DNS lookups against nameservers in many countries. It displays results on a map so users can check DNS propagation for a domain's IP address and DNS record information. The site says it maintains a range of DNS servers for lookups and parses the results for display.
Intelligence X provides a collection of free open source intelligence (OSINT) and forensic tools for investigative use. The tools support lookups for emails, domains, IP addresses, Bitcoin addresses, images, usernames, people, phone numbers, locations, files, VINs, and hashes, alongside social media intelligence tools for Facebook, Twitter, LinkedIn, Telegram, and YouTube, plus AI-powered search features. All third-party lookup services open in pop-up tabs, and the provider disclaims responsibility for third-party service results.
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.