Best Zero Day Initiative Published Advisories Alternatives & Competitors in 2026

CTIChef.com Detection Feeds

A tiered cyber threat intelligence service providing detection rules from public repositories with varying levels of analysis, processing, and guidance for security teams.

Constella Threat Intelligence Data Signals API

API providing access to compromised identity data and threat signals

IronNet IronRadar

Proactive C2 threat intelligence feed for detecting adversary infrastructure

KELA Technical Cybercrime Intelligence

Technical threat intel feed of compromised IPs/domains from cybercrime sources

OPSWAT MetaDefender InSights C2

Real-time C2 infrastructure detection and disruption threat intelligence feed

Bitdefender Operational Threat Intelligence

Threat intelligence platform providing global threat visibility and IoCs

Malware Patrol Enterprise CTI

Enterprise threat intelligence feeds covering malware, phishing, C2, and IPs

Malware Patrol Threat Intelligence

Threat intelligence feeds providing malware and threat data in multiple formats

ThreatSTOP IP Defense

Cloud service that automates threat blocking on firewalls, routers & switches

MaxMind IP Geolocation API

API service providing IP geolocation data and intelligence for security use cases

MaxMind GeoIP Insights

IP intelligence platform for proxy/VPN detection and geolocation

ZeroFox Threat Intelligence Feeds

Threat intelligence feeds for SOC teams from social, dark web & botnet sources

Sec1 ZeroDefender

Real-time zero-day vulnerability detection and alerting platform

Lookout Threat Intelligence Services

Mobile threat intelligence service providing threat data, research, and DFIR

CYJAX Investigative Intelligence

Investigative intelligence service for law enforcement agencies

Nozomi Networks Threat Intelligence

OT/IoT threat intelligence feed for vulnerability and malware detection

Ivanti Neurons for Vulnerability Knowledge Base

Vulnerability threat intelligence platform with risk-based scoring and CVE/CWE data

Armis Vulnerability Intelligence Database

AI-powered vulnerability intelligence database with real-time threat context

DarkOwl Ransomware API

API for monitoring ransomware sites to detect org compromises & extortion

Hitachi Cyber Cyber Threat Intelligence Services

CTI services combining human expertise and AI for threat analysis

IP2Location IP2Proxy Proxy Detection Database

Database for detecting VPNs, proxies, Tor exits, and anonymization services

NETSCOUT ATLAS Intelligence Feed (AIF)

AI-powered threat intelligence feed for automated DDoS protection

Picus Threat Library

Threat intelligence library with 30,000+ threats mapped to MITRE ATT&CK

SecurityScorecard Intelligence Feeds

Cyber threat intelligence feeds for SOC and threat intelligence teams

VerSprite Weekly Threat Intelligence

Weekly threat intelligence briefings published by VerSprite

VMRay UniqueSignal

Behavior-based threat intel feed delivering malware IOCs with context

zvelo PhishBlocklist™

Curated phishing threat intelligence feed with predictive detection

Nothreat ThreatShield

AI-driven threat intel feeds for automated blocking on 20+ firewall vendors

SecurityZones SURBL BV

Domain reputation threat intelligence feeds for malicious domain detection

Netcraft Threat Feeds

Threat intelligence feeds covering 100+ attack types with 5-min updates

IPQS IP Address Abuse Feed

Daily threat intel feed identifying malicious IPs with abuse classifications

IPQS Proxy Detection Database

Database for detecting proxies, VPNs, Tor nodes, and high-risk IP addresses

IPQS Proxy Detection API

API service for detecting proxies, VPNs, Tor nodes, and malicious IPs

IPQualityScore IP Risk Score API

Real-time IP fraud detection and risk scoring API for identifying malicious IPs

IPQS IP Address Block List

IP address blocklist service for identifying and blocking fraudulent IPs

Abusix Guardian Intel

Real-time threat intel feeds sourced from honeypots & ISP abuse reports.

Abusix Threat Intelligence

Real-time threat intel platform with IP/domain reputation scoring and low false positives.

Abusix Guardian

Suite for abuse desk mgmt, email blocklisting & threat intel for ISPs.

alphaMountain Threat Intel & URL Classification

AI-powered URL classification & IP reputation feed/API for security vendors.

alphaMountain URL Classification

ML-based URL & domain classification API for threat and content scoring.

alphaMountain Domain & IP Reputation

AI-based domain & IP threat scoring API for security product integration.

Antiy High-level Threat Intelligence Svc

Subscription threat intel service with reports, translations & security notifications.

Critical Start CTI

Managed CTI service monitoring dark web & open sources for emerging threats.

CrowdSec Live Exploit Tracker

Real-time CVE exploitation tracker with active IP feeds and IoC visibility.

OpenAVN Data

Digital threat intel platform with 300TB+ of malware data, AI analytics & forecasting.

DNSSense Cyber X-Ray

AI-powered DNS domain threat intelligence service for DDR 2.0 solutions.

Farsight Security DNSDB

Passive DNS intelligence platform for threat detection and investigation.