# GreyNoise

GreyNoise is a cybersecurity company based in the United States, founded in 2017. It has 2 products listed on CybersecTools.

> Internet threat intelligence platform filtering background noise from attacks

Source: https://cybersectools.com/companies/greynoise-inc · Updated October 2026

## Quick facts

- Category: [Threat Intelligence](https://cybersectools.com/categories/threat-intelligence)
- Type: Product vendor
- Headquarters: United States
- Founded: 2017
- Products listed: 2
- Website: [greynoise.io](https://www.greynoise.io/)

## What does GreyNoise do?

GreyNoise operates a global network of sensors that collect and analyze internet background noise to help security teams distinguish between targeted attacks and opportunistic scanning activity. The platform deploys sensors across different network locations to observe and categorize traffic hitting internet-facing systems, tagging IP addresses based on their behavior patterns. GreyNoise provides threat intelligence through API-accessible data, real-time blocklists, and a visualization platform that allows security practitioners to investigate IP addresses, understand their historical behavior, and identify malicious activity. The company's detection rules categorize traffic as benign, malicious, or unknown, with tags identifying specific attack types such as RDP crawlers, SMB exploits, and vulnerability scanners. Their product offerings include IP similarity searches to hunt for related bad actors, IP timeline views showing behavioral changes over time, and GreyNoise Block for configurable blocklists. The service helps organizations filter out mass internet scanning noise from security alerts, allowing teams to focus on genuine threats rather than opportunistic automated attacks that target all internet-connected systems indiscriminately.

Categories: [Threat Intelligence](https://cybersectools.com/categories/threat-intelligence)

## GreyNoise products

- [GreyNoise Block](https://cybersectools.com/tools/greynoise-block): Real-time threat intel platform detecting malicious scanning & exploitation (commercial)
- [GreyNoise Block: Fully configurable, real-time blocklists](https://cybersectools.com/tools/greynoise-block-fully-configurable-real-time-blocklists): Detects compromised assets via outbound traffic to GreyNoise sensors & malicious IPs (commercial)

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