---
id: whoisit
version: "4.0.4"
license: unclear
license_treatment: unclear
maintenance: active
---

# whoisit — A Python client to RDAP WHOIS-like services for internet resources.

License: unclear · Maintenance: active · Downloads: 86.5K/mo

## What it is and what it does

whoisit is a Python client library that abstracts over the RDAP protocol to query internet resource registries. It handles the bootstrapping logic (determining which RDAP service to query for a given resource) and parses RDAP JSON responses into flat dictionaries, so you don't have to implement HTTP routing and JSON extraction yourself. The library supports lookups for autonomous system numbers (ASNs), domain registrations, IPv4/IPv6 addresses and CIDR blocks, and entity handles across regional internet registries (ARIN, RIPE, APNIC, LACNIC, AFRINIC).

It offers both synchronous and asynchronous query methods, with options to retrieve raw RDAP JSON, follow related RDAP endpoints for richer domain data, and work around weak SSL implementations on some registry servers. The library is pure Python with minimal dependencies and requires Python 3.10 or later.

Use it for:

- Look up ASN ownership and details to identify which organization operates a given autonomous system.
- Resolve domain registration data including nameservers and registrar information via RDAP.
- Query IP address allocation and ownership to determine which RIR and organization manages a given IP or CIDR block.
- Retrieve entity contact and administrative information by entity handle across regional registries.
- Build bulk IP or domain reconnaissance tools that need current, authoritative registry data.
- Implement async batch lookups for network monitoring or security scanning workflows.

## Worth the install?

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

Query RDAP (Registration Data Access Protocol) services to look up internet resource information—ASNs, domains, IP addresses, and entities—returning parsed results as dictionaries.

Yes, if you need to query RDAP services for internet resource data. The library is actively maintained, has low install friction, and handles the bootstrapping and parsing complexity that would otherwise require manual HTTP and JSON work. Verify the license terms in the repository first, since the package metadata does not record them. No known security vulnerabilities.

## Install

pip install whoisit
uv add whoisit
poetry add whoisit

## Installing whoisit

Before you install: Low install friction with a pure-Python wheel and five standard runtime dependencies (httpx, requests, urllib3, python-dateutil, typing-extensions). Active maintenance with a recent commit on 2026-07-30 and steady releases.

License in practice: License treatment is unclear—no SPDX identifier or raw license text is recorded in the package metadata, so you should verify the actual license terms in the repository before adopting this package.

Quickstart:

pip install whoisit

import whoisit

whoisit.bootstrap()
results = whoisit.asn(1234)
print(results['name'])

Requires Python 3.10 or later. Bootstrap data must be fetched once before queries; async variants (asn_async, domain_async, ip_async, entity_async) are available.

Verify before relying:

- Whether the package's license is compatible with your project's requirements (license treatment is unclear in metadata).
- Performance and rate-limit behavior when making many concurrent RDAP queries.
- Coverage and reliability of RDAP services for less common TLDs or entity types.

## Package facts

- License: not declared (unclear)
- Python support: supports_current
- Install friction: low
- Maintenance: active
- Downloads: 86.5K/month (top 15,000 on PyPI)
- Known vulnerabilities: none known

## Tags

rdap whois lookup, ip address registration data, asn domain entity lookup, internet resource information, rdap client library, whois protocol python, rir registry queries, rdap, registry-lookup, network-data

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