---
id: pyfunceble-dev
version: "4.4.2"
license: Apache 2.0
license_treatment: permissive
maintenance: active
---

# PyFunceble-dev — The tool to check the availability or syntax of domain, IP or URL.

License: permissive · Maintenance: active · Downloads: 124.5K/mo

## What it is and what it does

PyFunceble is a domain, IP, and URL availability and syntax checker that combines multiple verification sources—WHOIS records, DNS lookups, and HTTP status codes—to determine whether a target is live or valid. It runs as a CLI tool or can be embedded in Python projects via its API, and supports input from hosts files, plain lists, AdBlock filter lists, and RPZ records.

The package is designed for active deployment in CI/CD pipelines (GitHub Actions, Travis CI, GitLab CI) and on standalone systems. It carries 15 runtime dependencies including SQLAlchemy, requests, dnspython, and PyMySQL, suggesting support for database backends and multiple query methods. The dev variant (pyfunceble-dev) receives frequent updates; the stable pyfunceble package updates more slowly after features mature.

Use it for:

- Bulk-verify domain lists in security scanning or threat intelligence workflows.
- Monitor domain and IP reputation as part of a CI/CD pipeline or scheduled job.
- Validate domain syntax and availability before registration or DNS configuration.
- Parse and check domains from AdBlock filter lists or DNS RPZ records.
- Integrate domain-checking logic into a Python application via the API.

## Worth the install?

AI-flagged interpretation of the facts above — verify before relying.

PyFunceble checks whether domains, IPs, and URLs are available or syntactically valid by querying WHOIS records, DNS records, and HTTP status codes.

Yes, if you need to check domain, IP, or URL availability at scale. Low install friction, permissive license, active maintenance, and no known vulnerabilities make it a safe choice. The 15 runtime dependencies suggest some overhead; verify whether your use case requires all of them or if a lighter alternative suits you better.

## Install

pip install pyfunceble-dev
uv add pyfunceble-dev
poetry add pyfunceble-dev

## Installing PyFunceble-dev

Before you install: Low install friction with a pure-Python wheel distribution. Active maintenance with a release 13 days old and recent commits; the project is actively developed and deployed across multiple platforms.

License in practice: Licensed under Apache 2.0 (permissive), allowing commercial and private use with minimal restrictions beyond attribution and liability disclaimers.

Quickstart:

pip install pyfunceble-dev

from pyfunceble import PyFunceble

checker = PyFunceble()
result = checker.check('example.com')

Requires Python 3.10 or later (supports current versions, <4). Some backends (e.g., PostgreSQL) require optional dependencies installed separately.

Verify before relying:

- Whether the 15 runtime dependencies (PyMySQL, SQLAlchemy, requests, etc.) are all required for basic domain checking or if some are optional for specific backends.
- Performance characteristics when checking large batches of domains or IPs.
- Whether the CLI and Python API have feature parity or if certain capabilities are CLI-only.

## Package facts

- License: Apache 2.0 (permissive)
- Python support: supports_current
- Install friction: low
- Maintenance: active
- Downloads: 124.5K/month (top 15,000 on PyPI)
- Known vulnerabilities: none known

## Tags

domain availability checker, DNS validation tool, URL status checker, WHOIS lookup automation, IP reputation checker, domain syntax validator, bulk domain verification, domain-checker, dns-validation, ci-cd-friendly

[View on SkillFed](https://skillfed.io/packages/pyfunceble-dev) · [View on PyPI](https://pypi.org/project/pyfunceble-dev/)