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OSINT

This page collects fast lookup and enrichment tools that help when you're validating suspicious IP addresses, domains, and malware indicators.

Search and Discovery​

Infrastructure and Reputation​

DNS, Certificates, and Internet Exposure​

Mail and DNS

MXToolbox SuperTool

One of the quickest ways to inspect DNS, MX, SPF, and related email infrastructure records.

mxtoolbox.com
Certificates

crt.sh

Certificate transparency searches that are especially good for finding related domains and hosts.

crt.sh
Exposure search

Censys

Internet-wide search for exposed services, certificates, and infrastructure fingerprints.

search.censys.io
WHOIS

DomainTools WHOIS

Useful for registration context, passive ownership clues, and domain history lookups.

domaintools.com
Recon

DNSDumpster

Fast DNS recon and mapping when you want a broader sense of a domain's infrastructure.

dnsdumpster.com
Storage exposure

GrayHat Warfare Buckets

Search exposed cloud storage buckets that may contain leaked files or suspicious artifacts.

grayhatwarfare.com
Tech stack

BuiltWith

Quickly fingerprint the technologies behind a site when you're profiling infrastructure or narrowing pivots.

builtwith.com
DNS analysis

DNSViz

Useful for visualizing DNS resolution issues, delegations, and trust-chain problems during deeper checks.

dnsviz.net
Registration data

ICANN Lookup

Another useful source for domain registration context when you want a second WHOIS-style view.

lookup.icann.org
Browser isolation

Browserling

Remote browser sessions that are handy for safely checking suspicious pages without using your local browser.

browserling.com
Subdomain discovery

Merklemap

Certificate-transparency-driven subdomain discovery that can surface related infrastructure faster.

merklemap.com
DNS pivots

Robtex

Strong for reverse DNS, host history, and infrastructure pivoting when you want more than a plain WHOIS view.

robtex.com
Historical DNS

SecurityTrails

Useful for historical DNS, related infrastructure, and broader passive domain intelligence.

securitytrails.com
TLS inspection

Qualys SSL Labs

Quick SSL/TLS configuration checks that can help when you're profiling suspicious or newly observed hosts.

ssllabs.com

URL and Threat Enrichment​

Page capture

urlscan.io

Public scans, screenshots, requests, and infrastructure details for suspicious URLs.

urlscan.io
URL sandboxing

urlquery

Dynamic URL analysis with request chains and page behavior for investigation work.

urlquery.net
Threat intel

AlienVault OTX

Community pulses and indicator context that can quickly broaden an investigation.

otx.alienvault.com
Malware samples

MalwareBazaar

Sample and hash lookups with family labels, sightings, and related malware context.

abuse.ch
C2 certificates

SSLBL

Abuse.ch tracking for suspicious SSL certificates and related command-and-control infrastructure.

abuse.ch
Malicious URLs

URLhaus

High-value feed and lookup source for URLs tied to malware delivery and distribution.

abuse.ch
IOC hunting

ThreatFox

Search indicators, malware tags, and sightings to enrich a campaign investigation.

abuse.ch
Threat pivots

ThreatMiner

Good for broader pivoting across indicators, reports, hashes, and campaign-linked infrastructure during enrichment.

threatminer.org
YARA matching

YARAify

Open YARA-driven threat intelligence that helps connect suspicious files to matching rules and related samples.

abuse.ch
Internet noise

GreyNoise

Useful for separating commodity internet background noise from activity that deserves closer attention.

greynoise.io
IOC enrichment

DFIR Platform

Multi-source enrichment and phishing-oriented investigation support when you want extra indicator context.

platform.dfir-lab.ch
URL forensics

Unfurl

Break apart complex URLs into readable forensic components during pivots and investigation writeups.

dfir.blog
IOC enrichment

Pulsedive

Useful for fast IOC enrichment, passive context, and tracking how suspicious infrastructure clusters together.

pulsedive.com
Multi-check analysis

MetaDefender

Another useful enrichment source for suspicious files, URLs, domains, hashes, and certificates.

metadefender.com
Redirect tracing

Redirect Detective

Quick redirect-chain checks when you want a lightweight view of where a suspicious link ultimately leads.

redirectdetective.com
URL scanning

TinyScan

Another scan-and-screenshot option for checking page details, location, and visible technology quickly.

tiny-scan.com

Phishing and Fraud Tracking​

Email, Breach, and Contact Research​

Identity and Account Research​

Company and Organization Research​

Broad Recon and Extra References​

Meta directory

OSINT Framework

A starting point for branching into deeper, specialized open-source intelligence workflows.

osintframework.com
Broad search

Intelligence X

Search across leaked data, domains, and other sources when a case needs wider coverage.

intelx.io
CMS recon

WPScan

WordPress-focused enumeration and vulnerability checking for site investigation work.

github.com/wpscanteam/wpscan
Automation

SpiderFoot

Automated recon and enrichment that helps stitch together infrastructure and identity clues.

github.com/smicallef/spiderfoot
Web history

Wayback Machine

Still one of the best places to confirm what a site looked like before it changed, vanished, or went malicious.

archive.org
Snapshot capture

Archive.is

Useful when you want a quick static snapshot of a page that may disappear or change soon.

archive.is
Reverse image search

TinEye

Fast reverse image checks for reused lures, stolen branding, and recycled scam visuals.

tineye.com
Image search

Yandex Images

Another strong reverse image source that can surface matches other engines miss.

yandex.com
Exposure search

Shodan

Classic internet exposure search for services, banners, and externally visible infrastructure.

shodan.io
Collection

theHarvester

Gather emails, hosts, subdomains, and related public-source data when you need a broader initial sweep.

github.com/laramies/theHarvester
Utility

ThreatYeti

A handy collection of small threat hunting and investigation helpers.

threatyeti.com
Extortion tracking

ransomware.live

Keep tabs on public ransomware leak sites, claims, and observed victim postings.

ransomware.live
Code search

grep.app

Fast code search across public repositories when you are tracing strings, IOCs, or tooling reuse.

grep.app
Repo search

GitHub Code Search

Native GitHub search for tracing strings, usernames, leaked material, and reused code across public repos.

github.com
Source code search

PublicWWW

Search website source code at scale for reused IDs, scripts, tracker snippets, and embedded strings.

publicwww.com
Code examples

Searchcode

Helpful when you are tracing code fragments, functions, or public tooling references across indexed repositories.

searchcode.com
Code search

Sourcegraph

Another strong large-scale code search option for tracking strings, libraries, and implementation reuse.

sourcegraph.com
Legacy feed

VX Vault

A long-running malware URL reference that can still be useful as an extra point of comparison.

vxvault.net

Malware and Adversary Knowledge​

Threat Intelligence Platforms and Sharing​

Shoutout to large community-maintained aggregators like jivoi's awesome-osint, awesome-malware-analysis, and awesome-threat-intelligence, which helped me cross-check and expand this page with additional tools that weren't already listed here. These kinds of maintained bulk resources do a ton of quiet, useful work for the rest of us.