GreyNoise
APIFree IP reputation API for security threat intelligence
Overview
GreyNoise is a RESTful security API that lets users query IP addresses against its dataset of internet-wide scan and attack activity. Key endpoints include the free community IP lookup (v3/community/ip), which returns JSON-formatted context like IP classification (malicious/benign), scan patterns, associated threat tags, geographic details, and ASN information. Ideal for threat hunters, SOC analysts, and developers—use cases include validating suspicious IPs in incident response, filtering false positives in SIEM alerts, and enhancing firewall rules with real-time threat data. The API supports JSON responses and offers both free community access and paid premium tiers.
Example Integration (JavaScript)
fetch('https://docs.greynoise.io/reference/get_v3-community-ip')
.then(res => res.json())
.then(data => console.log(data))
.catch(err => console.error(err)); Key Features
- RESTful
- JSON support
- Free community tier
- IP classification
- Threat intelligence data
- Geographic & ASN details
Frequently Asked Questions
? Is GreyNoise free to use?
Yes, GreyNoise offers a free community tier with basic IP lookup endpoints (e.g., v3/community/ip) and rate limits. Paid premium tiers unlock full dataset access and advanced features like bulk queries.
? Does it require an API Key?
Yes—even the free community tier requires an API key, which can be obtained by signing up on the GreyNoise website.
? What is the response format?
All GreyNoise API responses are in JSON format, including details like IP classification, scan activity, threat tags, geographic location, and ASN information.
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Tool Info
Pros
- ⊕ Easy to integrate
- ⊕ Free basic access
- ⊕ Rich IP context
- ⊕ Well-documented
- ⊕ Real-time threat insights
Cons
- ⊖ Rate limits on free tier
- ⊖ Full features require payment
- ⊖ No XML support
- ⊖ Limited data in community plan