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web-check

Operator: Alicia Sykes

Analyses websites using DNS, WHOIS, TLS and technology checks. Free in a browser or on your own infrastructure.

Technical Infrastructure

Open website

Product

Free open-source web application for analysing websites. A public web version and installation on your own infrastructure are available.

Availability and source date

Active

As of: 16 October 2026.

No functionality test has been performed.

Use in OSINT research

Shows technical connections, domain details and public traces associated with a website. Helps assess hosting, subdomains and the technologies used.

Queries

InputResultResult type
Domain / website + URLDNS records, registration details, IP address, subdomains from certificates and available Wayback snapshots.
Retrieved
URLHTTP headers, TLS certificate, redirects, technologies and various security checks.
Technical check according to provider

Features

  • Queries DNS, WHOIS and IP information.
  • Shows certificates, redirects and HTTP headers.
  • Identifies subdomains and linked web pages.
  • Identifies technologies in use and performs security checks.
  • Adds information from Shodan, Wayback and other services.

Categories

  • Technical Infrastructure
  • Domains & WHOIS
  • DNS

Coverage

Dataset

Live website queries and additional information from external services, such as Shodan, Wayback and CertSpotter.

Access

Installation and deployment

Website · Locally installable · Self-hosted

Web version at web-check.as93.net. Your own web interface and API can run locally or on a server, using Docker or the source code. The separately hosted Web-Check API service requires an account and an API key.

Requirements

Public web version without installing your own instance. Self-hosting with Docker or Node.js and Yarn. Some checks require additional programs or API keys.

Export

Unknown

Provider

Alicia Sykes

Country of establishment

Unknown

Interfaces

API

Available. An API server is included in the installation and can run without the web interface. A separate hosted API service requiring an account and key is also offered.

MCP

Not documented. Not documented in the README, installation and release pages reviewed.

AI agents

Not documented. Not documented in the README, installation and release pages reviewed.

Maintenance

Licence

MIT

Latest activity

Commit 10/2026

Stars

approx. 35,100 (as of 16 October 2026)

Limitations

  • Some checks require keys or additional programs. Scope and limits also depend on external services.
  • The public service limits query rates. Running your own instance may incur hosting costs.
  • Some checks access the target website directly.

Guides and practical reports

Sources

Report an error