ip.thc.org
Unlimited Reverse DNS, Subdomain and Reverse CNAME lookups, also provides JSON APIs.
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ip2geo.dev
IP geolocation API providing city, country, timezone, ASN, and currency data from IP addresses.
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.
ipfingerprints.com
A web service that displays the visitor's public IP address. It states that the address is assigned by the Internet Service Provider and can indicate general geographic location, and it suggests uses such as checking the current address, verifying a network connection and sharing the address with support teams for troubleshooting. It notes that only the IP is shown.
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
ismalicious.com
isMalicious checks IPs, domains, URLs, emails, phones and crypto wallets against indexed threat indicators. It returns verdicts with contributing sources, categories and a risk score from 0 to 100 in a JSON response. Data is available through a REST API, STIX/TAXII feeds and an MCP integration for AI assistants. A free plan allows 50 lookups per month.
kg.meowing.de
Kittygram is an anonymous, privacy-friendly, lightweight, open-source frontend for browsing Instagram, inspired by nitter. It serves fully prerendered pages and handles requests itself to reduce tracking. Users can search for users or hashtags, or replace www.instagram.com in Instagram links with the instance domain. The source code is on Codeberg under the AGPL-3.0 license.
kittygram.irelephant.net
Kittygram is an anonymous, privacy-friendly, lightweight, open-source Instagram frontend inspired by nitter. It serves fully prerendered pages instead of the JavaScript-heavy official web interface, and all requests are handled by Kittygram to reduce tracking. Users can search for users or hashtags, or replace www.instagram.com in a link with the domain. The source code is on Codeberg under AGPL-3.0.
kloth.net
Kloth is a web tool for finding, checking, or analyzing online information related to domains, networks, and digital services.
kutt.to
Kutt is a free, open source modern URL shortener. It supports custom domains, link management, usage statistics, an API for programmatic access, and offers browser extensions for Chrome and Firefox, with options to self-host the service.
github.com
Ladder is a self-hosted HTTP web proxy and developer tool for testing and analyzing paywall implementations and content delivery behavior on websites. It can remove or modify CORS and other headers, inject custom code, apply domain-based rulesets and emulate different client types. The project states it does not circumvent advanced access restrictions and may not function on services that actively restrict access.
link-extractor.cssnr.com
Link Extractor is a Chrome extension and Firefox addon that extracts, parses, or opens all links and domains from a site or text with optional filters. It also extracts links from selected text, the clipboard, selected tabs, and PDF documents, and can open multiple links or download them as a text file.
mail.cx
Mail.cx is a disposable temporary email service that generates a short-lived inbox without signup. The free web inbox keeps mail for one hour, with a Pro plan adding custom domains, 72-hour retention and REST API access. The API supports long-poll and SSE push for automated inbox polling and AI agents.
mail.td
Mail.td is a temporary email service built for receiving email at scale. It offers password-protected inboxes and custom domains. A Pro plan adds webhooks and higher API limits for teams. The service is receive-only, and email retention differs between the Free and Pro plans.
whois-webform.markmonitor.com
Mark Monitor WHOIS is a web tool for finding, checking, or analyzing online information related to domains, networks, and digital services.
mataroa.blog
Mataroa is a blogging platform for minimalists. Posts are written in markdown, hosted at a .mataroa.blog address or a custom domain, and can be exported. The site states no ads, no tracking cookies and no email required for signup. A premium plan is listed at $9 per year.
maxmind.com
MaxMind is a web tool for finding, checking, or analyzing online information related to domains, networks, and digital services.
navi.land
navi.land is an email service that offers standard IMAP/SMTP access. It provides encrypted storage, a Tor Onion Service, and custom domain support. Registration does not require phone numbers or personal information, and payments are accepted in Monero only. The site states that email is received in plaintext before being stored and recommends GPG use. Premium plans start at 25 EUR for lifetime storage.
toolbar.netcraft.com
is an online database that will provide you a report with detail information about a particular website and the history associated with it.
nitrc.org
NITRC is an NIH-supported open domain-specific repository for the neuroimaging community. It hosts tools, data and resources, including featured tools such as MRIcroGL, eeg_pipelines, BabelBrain and BrainEffeX, and provides a user guide for browsing and administering resources.
openlinkprofiler.org
OpenLinkProfiler is a web tool for finding, checking, or analyzing online information related to domains, networks, and digital services.
osintessentials.com
Curated OSINT toolkit with links for people search, social media, maps, domains, and research.
github.com
Passive OSINT reconnaissance framework in Rust: subdomains, DNS, ASN, certificate transparency history, GitHub dorking, tech fingerprinting, emails an
owncast.online
Owncast is a free and open source live video and web chat server that works with existing broadcasting software. Users point their live stream at an Owncast server they control. It includes built-in chat with moderation tools and custom emotes, custom branding and domain options, notifications, and fediverse support. It runs on the user's own server with standard streaming protocols.