greynoise.io
IP intelligence tool for checking scan traffic, noisy hosts, and suspicious internet activity.
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iknowwhatyoudownload.com
Public torrent activity lookup showing observed downloads linked to IP addresses.
infosniper.net
InfoSniper is a free IP address lookup service that locates an IP on an interactive map with city, region, country, ISP, ASN, timezone and coordinates, supporting IPv4 and IPv6. It also offers XML and JSON REST APIs requiring an API key for IP geolocation data.
nerd.cesnet.cz
The Network Entity Reputation Database IP search is a CESNET page that searches and lists IP addresses with hostname, ASN, country, events, reputation score, threat category, other properties, time added and last activity. It provides links to services including Shodan, Censys, AbuseIPDB, Talos Intelligence Center, Greynoise Visualizer and DShield. Results shown include DShield reports and OTX pulses.
ip.thc.org
Unlimited Reverse DNS, Subdomain and Reverse CNAME lookups, also provides JSON APIs.
ip2location.com
IP2Location provides a free IP lookup demo that reports geolocation and proxy data for an IP address. Results include country, region, city, coordinates, ISP, usage type, ASN, and proxy status. The demo uses the IP2Location DB26 geolocation database and IP2Proxy PX12 proxy database, and also shows an IP geolocation API response.
ipok.io
Free, no-login IP reputation lookup that aggregates up to 8 risk sources, flags residential vs datacenter, and profiles /24 C-block neighbors. Also of
leakix.net
LeakIX is a search and reporting platform with query syntax for ports, protocols, ASNs and IP ranges. It offers free and commercial plans, with paid tiers providing faster access to results, higher request limits, critical and RCE plugins, alert channels and downloadable results. Sponsorship supports voluntary researchers who dispatch free reports to companies and institutions.
borntoberoot.net
NETworkManager is a free, open-source tool for managing networks and troubleshooting network problems. It includes 28 built-in tools such as an IP scanner, port scanner, ping monitor, DNS lookup, remote desktop and PowerShell in a single interface. It offers profiles for organizing hosts, and no license, subscription or telemetry.
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.
intelx.io
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.
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.
nicb.org
VINCheck allows a user to enter a vehicle identification number to learn whether the vehicle has been reported as stolen but not recovered or as a salvage or flood-damaged vehicle by participating NICB member insurance companies. The free service is limited to five searches within a 24-hour period per IP address and is not a comprehensive vehicle history report.
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.
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.