GreyNoise

Best Self Hosted Alternatives to GreyNoise

A curated collection of the 1 best self hosted alternatives to GreyNoise.

GreyNoise collects and analyzes internet-wide scanning and automated bot activity to produce IP reputation and contextual metadata, enabling security teams and detection platforms to filter background noise, triage alerts, and prioritize genuine threats.

Alternatives List

#1
Mistborn

Mistborn

Mistborn aggregates threat intelligence from multiple sources to enrich, normalize, and distribute IOCs for security analysis and incident response workflows.

Mistborn screenshot

Mistborn is an open source threat intelligence aggregation service designed to collect indicators of compromise (IOCs) and related threat data from multiple sources, normalize it, and make it easier to consume for security operations. It helps teams centralize feeds, reduce duplication, and improve the usability of threat intel in downstream tooling.

Key Features

  • Aggregates threat intelligence from multiple sources and feed formats
  • Normalizes and de-duplicates common IOC types (such as IPs, domains, URLs, and hashes)
  • Enrichment support to add context to indicators (where configured)
  • Export-oriented design for integrating aggregated intel into other systems
  • Designed for ongoing ingestion and updating of intelligence over time

Use Cases

  • Consolidating multiple threat feeds into a single curated dataset
  • Providing enriched IOC lists for SIEM, EDR, or firewall blocklists
  • Supporting incident response investigations with centralized threat intel

Mistborn is a practical option for teams that want a lightweight, self-managed way to operationalize threat intelligence, especially when working with many disparate feeds. By unifying collection and normalization, it can reduce analyst overhead and improve consistency across security workflows.

Why choose an open source alternative?

  • Data ownership: Keep your data on your own servers
  • No vendor lock-in: Freedom to switch or modify at any time
  • Cost savings: Reduce or eliminate subscription fees
  • Transparency: Audit the code and know exactly what's running