Censys

Overview

Censys continuously scans the entire internet and indexes every reachable host with detailed information about open ports, TLS/SSL certificates, service banners, and configurations. Censys is particularly strong for certificate-based discovery — it indexes certificate transparency logs and lets you pivot from certificate subject names to IP addresses and vice versa. This makes it excellent for finding unknown infrastructure tied to a target organization.

Requires: Censys API key (free account at censys.io gives 250 queries/month).

Instructions

Step 1: Install and configure

pip install censys

import os
from censys.search import CensysHosts, CensysCerts