theHarvester

theHarvester gathers open-source intelligence about a domain or organization from search engines, certificate transparency logs, DNS datasets, code repositories, threat-intelligence platforms, and other public sources.

It is built for the early reconnaissance stage of authorized security assessments. Use it only on targets you own or have explicit permission to test.

Why theHarvester

• Broad discovery coverage: combine many independent sources in one run instead of querying each provider manually.
• Useful result types: collect hostnames, email addresses, IP addresses, URLs, ASNs, and people.
• Enrichment after discovery: optionally resolve DNS, query Shodan, check for subdomain takeovers, brute-force DNS names, scan common API paths, and capture screenshots.
• CLI and browser-accessible API: use the command line interactively or run the FastAPI service for automation and interactive Swagger/ReDoc documentation.
• Repeatable output: print results, write JSON and XML reports, and retain host, email, and IP findings in a local SQLite database.
• Operational controls: select individual sources, set result limits, use HTTP or SOCKS proxies, choose DNS resolvers, and suppress missing-key noise.

Source availability, quotas, and response formats are controlled by third parties and can change independently of theHarvester.

Quick start

theHarvester requires Python 3.12 or newer and uses uv for dependency management.

curl -LsSf https://astral.sh/uv/install.sh | sh
git clone https://github.com/laramies/theHarvester.git
cd theHarvester
uv sync
uv run theHarvester -d example.com -b crtsh,certspotter

See the installation guide for platform-specific setup and packaged distributions.

Common workflows

Query several passive sources:

uv run theHarvester -d example.com -b crtsh,certspotter,commoncrawl

Save both JSON and XML reports:

uv run theHarvester -d example.com -b crtsh,certspotter -f report

Resolve discovered hosts for an authorized domain with the default resolver list:

AUTHORIZED_DOMAIN='replace-with-a-domain-you-control'
uv run theHarvester -d "$AUTHORIZED_DOMAIN" -b crtsh,certspotter -r

List every option and its current behavior:

uv run theHarvester -h

Active features

Options such as DNS brute force (-c), reverse DNS lookup (-n), takeover checks (-t), API endpoint scanning (-a), DNS resolution (-r), and screenshots (--screenshot) generate additional network activity. Use them only within an explicitly authorized scope.

Screenshot capture also requires a Playwright-compatible browser; see the installation guide for setup.

Browser interface and REST API

restfulHarvest starts a FastAPI service on 127.0.0.1:5000 by default:

uv run restfulHarvest

Open http://127.0.0.1:5000/docs for interactive Swagger documentation or http://127.0.0.1:5000/redoc for ReDoc.

Route	Purpose
GET /sources	List registered discovery sources.
GET /query	Return ASNs, interesting URLs, Twitter/LinkedIn fields, Trello URLs, IPs, emails, and hosts as JSON.
GET /dnsbrute	Run DNS brute force for a domain.
POST /additional/breaches	Return Have I Been Pwned breach data.
POST /additional/leaks	Return Leak-Lookup data.
POST /additional/security-score	Return SecurityScorecard data.
POST /additional/tech-stack	Return BuiltWith technology data.
POST /additional/all	Run all additional API lookups.

The service rate limit defaults to five requests per minute and can be changed with --rate-limit. The /additional/* routes require THEHARVESTER_API_KEY on the server and the same value in the X-API-Key request header.

The core /query, /sources, and /dnsbrute routes are not authenticated. Keep the service bound to localhost unless you place it behind appropriate authentication, access controls, and TLS. Docker Compose publishes port 5000 on every host interface unless you narrow the port mapping:

docker compose up --build

Discovery sources

Saved JSON reports expose separate fields for hosts, emails, IP addresses, ASNs, URLs or links, and people when those results are available. The result-type columns below describe only that consolidated CLI report. They do not include every field parsed from a provider response. Empty fields may be omitted, and reports do not retain per-source attribution.

A checkmark means the current CLI can add that result type to its consolidated report. The Separate output column identifies REST endpoints or optional actions whose results are not part of those source columns. In the API key column, ✓ means credentials are required, Optional means a key can unlock additional access, and — means the source has no key setting.

View the source and result matrix

Source	Hosts	Emails	IPs	ASNs	URLs / links	People	Separate REST/action output (not consolidated report)	API key
baidu	✓	✓	—	—	—	—	—	—
bevigil	✓	—	—	—	✓	—	—	✓
bitbucket	✓	✓	—	—	—	—	—	✓
bufferoverun	✓	—	✓	—	—	—	—	✓
builtwith	✓	—	—	—	✓	—	POST /additional/tech-stack response	✓
brave	✓	✓	—	—	—	—	—	✓
censys	✓	✓	—	—	—	—	—	✓
certspotter	✓	—	—	—	—	—	—	—
chaos	✓	—	—	—	—	—	—	✓
commoncrawl	✓	—	—	—	—	—	—	—
criminalip	✓	—	✓	✓	—	—	—	✓
crtsh	✓	—	—	—	—	—	—	—
dehashed	—	—	✓	—	—	—	—	✓
dnsdumpster	✓	—	✓	—	—	—	—	✓
duckduckgo	✓	✓	—	—	—	—	—	—
dymo	✓	—	—	—	—	—	—	✓
fofa	✓	—	✓	—	—	—	—	✓
fullhunt	✓	—	—	—	—	—	—	✓
github-code	✓	✓	—	—	—	—	—	✓
gitlab	✓	✓	—	—	—	—	—	—
hackertarget	✓	—	—	—	—	—	—	Optional
haveibeenpwned	—	—	—	—	—	—	POST /additional/breaches response	✓
hudsonrock	✓	✓	✓	—	—	—	—	—
hunter	✓	✓	—	—	—	—	—	✓
hunterhow	✓	—	—	—	—	—	—	✓
intelx	—	✓	—	—	✓	—	—	✓
leakix	✓	✓	—	—	—	—	—	Optional
leaklookup	—	✓	—	—	—	—	POST /additional/leaks response	✓
mojeek	✓	✓	—	—	—	—	—	Optional
netlas	✓	—	—	—	—	—	—	✓
onyphe	✓	—	✓	✓	—	—	—	✓
otx	✓	—	✓	—	—	—	—	—
pentesttools	✓	—	—	—	—	—	—	✓
projectdiscovery	✓	—	—	—	—	—	—	✓
rapiddns	✓	—	—	—	—	—	—	—
robtex	✓	—	✓	—	—	—	—	—
rocketreach	—	✓	—	—	✓	—	—	✓
securityscorecard	✓	—	✓	—	—	—	POST /additional/security-score response	✓
securityTrails	✓	—	✓	—	—	—	—	✓
sherlockeye	✓	✓	✓	—	—	—	—	✓
shodan	✓	—	—	—	—	—	-s / --shodan host-enrichment output	✓
shodanInternetDB	✓	—	✓	—	—	—	—	—
subdomaincenter	✓	—	—	—	—	—	—	—
subdomainfinderc99	✓	—	—	—	—	—	—	—
thc	✓	—	—	—	—	—	—	—
threatcrowd	✓	—	✓	—	—	—	—	—
tomba	✓	✓	—	—	—	—	—	✓
urlscan	✓	—	✓	✓	✓	—	—	—
venacus	—	✓	✓	—	✓	✓	—	✓
virustotal	✓	—	—	—	—	—	—	✓
waybackarchive	✓	—	—	—	—	—	—	—
whoisxml	✓	—	—	—	—	—	—	✓
windvane	✓	✓	✓	—	—	—	—	Optional
yahoo	✓	✓	—	—	—	—	—	—
zoomeye	✓	✓	✓	✓	✓	—	—	✓

Provider pricing is intentionally omitted because plans and quotas change frequently. See Configuration and API Keys and each provider's current documentation.

The runtime registry also reports the legacy identifiers linkedin, linkedin_links, netcraft, omnisint, sublist3r, and zoomeyeapi. They have no active CLI handlers in the current code and are therefore not presented as usable sources in this table.

Configuration

On first use, theHarvester creates default configuration files under ~/.theHarvester/. It also reads system configuration from /etc/theHarvester/ and /usr/local/etc/theHarvester/.

• api-keys.yaml stores provider credentials.
• proxies.yaml configures HTTP and SOCKS5 proxies used with -p.

Never commit populated configuration files, API keys, account details, or provider responses.

Results and local data

• Terminal output shows consolidated findings. Separately selected actions, such as -s / --shodan, may print their own enrichment.
• -f NAME writes NAME.json and NAME.xml.
• Screenshots are written to the directory passed to --screenshot.
• Host, email, IP, and related scan records are stored in ~/.local/share/theHarvester/stash.sqlite.
• REST queries return JSON.

Treat collected OSINT as potentially sensitive. Keep report files, screenshots, and the local database out of source control and share them only within the authorized engagement.

Report formats

The JSON report is a single object and is the more complete format for automation. Host entries may be plain hostnames or hostname:IP pairs when DNS resolution is enabled.

Field	Availability	Contents
cmd	Always	Command-line arguments used for the run.
hosts	Always	Discovered hosts; an empty array when none are found.
shodan	Always	Shodan enrichment rows; an empty array when Shodan is not used.
ips, emails, vhosts, asns	When non-empty	Network and contact findings.
interesting_urls, trello_urls, linkedin_links	When non-empty	Discovered links and URLs.
people, twitter_people, linkedin_people	When non-empty	People and profile findings.
takeover_results	When non-empty	Optional takeover-check results.

The XML report contains the command, emails, hosts, and virtual hosts. Use JSON when you need the additional result types above.

List discovered hosts with jq:

jq -r '.hosts[]?' report.json

Count common result types while safely handling omitted fields:

jq '{
  hosts: (.hosts // [] | length),
  emails: (.emails // [] | length),
  ips: (.ips // [] | length),
  asns: (.asns // [] | length)
}' report.json

Export common findings as tab-separated values:

jq -r '(
  ["type", "value"],
  (.hosts[]? | ["host", .]),
  (.emails[]? | ["email", .]),
  (.ips[]? | ["ip", .]),
  (.asns[]? | ["asn", .])
) | @tsv' report.json > findings.tsv

Development and contributing

Read CONTRIBUTING.md for the development setup, required checks, testing expectations, and pull-request process.

Support and credits

• Use GitHub Issues for reproducible bugs and focused feature requests.
• Report suspected vulnerabilities according to SECURITY.md, not in public issues.
• Christian Martorella (@laramies) created theHarvester — cmartorella@edge-security.com.
• Jay Townsend and Matt Brown maintain and develop the project.
• Lee Baird is a main contributor.
• Thanks to John Matherly for Shodan and Ahmed Aboul Ela for the bundled subdomain dictionaries.