Best autoSubTakeover Alternatives & Competitors in 2026

Detectify Platform

Platform for external attack surface management and application security testing

Detectify Surface Monitoring

Monitors internet-facing subdomains for vulnerabilities and misconfigurations

ThreatDefence Integrated ASM

ASM platform monitoring external attack surface, dark web leaks & 3rd-party risks.

crt.sh

Bash script for subdomain enumeration via crt.sh certificate transparency logs.

Amass

Amass is an open-source OWASP tool for comprehensive attack surface mapping and asset discovery through domain reconnaissance and subdomain enumeration.

domfind

Python utility for testing the existence of domain names under different TLDs to find malicious subdomains.

findmytakeover

A multi-cloud DNS security tool that detects dangling DNS records and potential subdomain takeover vulnerabilities by scanning cloud infrastructure and DNS zones.

Projectdiscovery.io | Chaos

A powerful enumeration tool for discovering assets and subdomains.

ScanCannon

A Python-based tool for external attack surface discovery and reconnaissance across large-scale networks, focusing on IP address and subdomain enumeration.

cnames

A tool for taking a list of resolved subdomains and outputting any corresponding CNAMES en masse.

Assetnote Attack Surface Management Tool

ASM platform that scans external attack surfaces hourly for vulnerabilities

SOC Radar DNS Monitoring

SOCRadar DNS Monitoring provides real-time monitoring of DNS infrastructure with automated discovery, record change alerts, and detection of DNS-based security threats.

SOC Radar Attack Surface Management

SOCRadar Attack Surface Management is an EASM platform that continuously discovers, monitors, and assesses internet-facing digital assets for vulnerabilities and security risks.

Akamai DNS Posture Management

DNS security posture management across multicloud and on-prem environments

Halo Security Attack Surface Discovery

Discovers and inventories internet-facing assets including subdomains, IPs, and apps.

Trickest ASM - Attack Surface Management

Customizable ASM platform for asset discovery, monitoring, and enrichment

Intruder Discover Attack Surface

Attack surface management platform for discovering and securing exposed assets

Guardz External Footprint

External attack surface monitoring with dark web intelligence and scanning

Ceeyu Digital Footprint Monitoring

Automated digital asset discovery and monitoring for external attack surface

Edgescan Attack Surface Management (ASM)

External attack surface management platform for asset discovery and monitoring

Muscope|Risk - Attack Perimeter

Maps external attack surface including assets, dark web exposure, and leaks.

Cylana EASM

AI-powered EASM platform for digital asset discovery and monitoring.

Threat Surface - Attack Surface Management

EASM platform for continuous discovery and risk assessment of external assets.

ExposeLens

Domain exposure monitoring tool for leaked creds, subdomains & dark web data.

FestIn

FestIn discovers open S3 buckets associated with a domain using crawling and DNS reconnaissance techniques.

Findomain

A domain reconnaissance tool that automates subdomain discovery, port scanning, and monitoring with support for multiple data sources and notification integrations.

ONYPHE

ONYPHE is a cyber defense search engine that discovers exposed assets and provides real-time monitoring to identify vulnerabilities and potential risks.

DNSDumpster

DNSDumpster is a domain research tool for discovering and analyzing DNS records to map an organization's attack surface.

Sublist3r

Sublist3r is a python tool for enumerating subdomains using OSINT and various search engines.

massdns

A high-performance DNS stub resolver for bulk lookups and reconnaissance (subdomain enumeration)

Sudomy

A subdomain enumeration tool for bug hunting and pentesting

censys-subdomain-finder

A tool for performing subdomain enumeration using Censys API

Turbolist3r

A Python-based tool for subdomain enumeration and analysis

censys-enumeration

A script to extract subdomains/emails for a given domain using SSL/TLS certificate dataset on Censys.

as3nt

A tool for enumerating subdomains of a given domain

Subra

A simple web-based interface for subdomain enumeration using the subfinder tool.

brutesubs

An automation framework that runs multiple open-source subdomain bruteforcing tools in parallel using Docker Compose and custom wordlists.

Knock

A subdomain scan tool that helps you find subdomains of a given domain.

Subfinder

Fast passive subdomain enumeration tool

assetfinder

A command-line tool for discovering domains and subdomains related to a target domain during reconnaissance activities.

crtndstry

A subdomain finder tool

aquatone

A tool for domain flyovers

WayMore

A tool that finds more information about a given URL or domain by querying multiple data sources.

SubOver

A powerful tool for finding and exploiting subdomain takeover vulnerabilities

tko-subs

A tool for detecting and taking over subdomains with dead DNS records

ImmuniWeb® Discovery

ImmuniWeb Discovery is an attack surface management platform that continuously monitors an organization's external digital assets for security vulnerabilities, misconfigurations, and threats across domains, applications, cloud resources, and the dark web.

Outpost24 External Attack Surface Management

Cloud platform for continuous visibility & mgmt of external attack surfaces

StrikeOne Attack Surfa

AI-powered attack surface management platform for cybersecurity monitoring