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Knock is a free External Attack Surface Management tool. Security professionals most commonly compare it with . All 154 alternatives are matched by shared capabilities, tags, and NIST CSF 2.0 coverage.
A closer look at the 8 most relevant alternatives and competitors to Knock, including their key features and shared capabilities.
A domain reconnaissance tool that automates subdomain discovery, port scanning, and monitoring with support for multiple data sources and notification integrations.
Amass is an open-source OWASP tool for comprehensive attack surface mapping and asset discovery through domain reconnaissance and subdomain enumeration.
A script to extract subdomains/emails for a given domain using SSL/TLS certificate dataset on Censys.
An automation framework that runs multiple open-source subdomain bruteforcing tools in parallel using Docker Compose and custom wordlists.
A command-line tool for discovering domains and subdomains related to a target domain during reconnaissance activities.
A Python-based tool for external attack surface discovery and reconnaissance across large-scale networks, focusing on IP address and subdomain enumeration.
Internet intelligence platform for asset discovery and attack surface mapping
Automated ASM tool for multi-cloud environments with continuous asset discovery
A domain reconnaissance tool that automates subdomain discovery, port scanning, and monitoring with support for multiple data sources and notification integrations.
Amass is an open-source OWASP tool for comprehensive attack surface mapping and asset discovery through domain reconnaissance and subdomain enumeration.
A script to extract subdomains/emails for a given domain using SSL/TLS certificate dataset on Censys.
An automation framework that runs multiple open-source subdomain bruteforcing tools in parallel using Docker Compose and custom wordlists.
A command-line tool for discovering domains and subdomains related to a target domain during reconnaissance activities.
A Python-based tool for external attack surface discovery and reconnaissance across large-scale networks, focusing on IP address and subdomain enumeration.
Internet intelligence platform for asset discovery and attack surface mapping
Automated ASM tool for multi-cloud environments with continuous asset discovery
Active attack surface mgmt solution for discovering & remediating unknown risks
Platform for external attack surface management and application security testing
Monitors internet-facing subdomains for vulnerabilities and misconfigurations
Discovers and inventories internet-facing assets including subdomains, IPs, and apps.
Attack surface management platform for discovering and securing exposed assets
ASM platform that scans external attack surfaces hourly for vulnerabilities
Continuous external attack surface discovery and asset validation service
Automated digital asset discovery and monitoring for external attack surface
External attack surface mapping service to discover exposed digital assets
External attack surface scanning for MSPs to identify vulnerabilities
OSINT tool for mapping & monitoring risk ecosystems on Clear & Deep Web.
Continuous external asset discovery and monitoring with daily domain scans.
Maps external attack surface including assets, dark web exposure, and leaks.
Passive pre-sale domain diagnostic tool for vCISOs, MSPs & MSSPs.
ASM platform for continuous discovery and risk validation of internet-exposed assets.
ZoomEye is an advanced cyberspace search engine that provides detailed information on cyberspace assets, including server software and version information, for cybersecurity experts, researchers, and enterprises.
FestIn discovers open S3 buckets associated with a domain using crawling and DNS reconnaissance techniques.
Explore the top million websites, ranked by referring subnets, and gain insights into online influence and popularity.
WiGLE.net is a platform that collects and provides data on WiFi networks and cell towers, with over 1.3 billion networks collected.
FullHunt is a next-generation attack surface security platform that enables companies to discover, monitor, and secure their external attack surfaces.
A technology lookup and lead generation tool that identifies the technology stack of any website and provides features for market research, competitor analysis, and data enrichment.
A source code search engine for searching alphanumeric snippets, signatures, or keywords in web page HTML, JS, and CSS code.
Automate your reconnaissance process with AttackSurfaceMapper, a tool for mapping and analyzing network attack surfaces.
Cloud_enum is a multi-cloud OSINT tool that enumerates publicly accessible resources across AWS, Azure, and Google Cloud platforms for security assessment purposes.
A Go-based tool for discovering and inventorying internet-facing AWS assets across single or multiple accounts to help maintain comprehensive cloud attack surface visibility.
An easy-to-use and lightweight API wrapper for Censys APIs with support for Python 3.8+.
Python utility for testing the existence of domain names under different TLDs to find malicious subdomains.
A multi-cloud DNS security tool that detects dangling DNS records and potential subdomain takeover vulnerabilities by scanning cloud infrastructure and DNS zones.
A black-box reconnaissance tool that discovers cloud infrastructure, files, and applications across major cloud providers for security testing purposes.
A powerful enumeration tool for discovering assets and subdomains.
A tool for performing subdomain enumeration using Censys API
A Python-based tool for subdomain enumeration and analysis
A simple web-based interface for subdomain enumeration using the subfinder tool.
A tool for generating permutations, alterations and mutations of subdomains and resolving them
An information gathering tool for DNS, subdomains, ports, and directories enumeration.
A Python API client for BuiltWith that enables programmatic access to website technology profiling and reconnaissance data.
A Go-based web crawler that supports multiple protocols and authentication methods for systematic web resource discovery and collection.
A tool that finds more information about a given URL or domain by querying multiple data sources.
CloudScraper is an enumeration tool that discovers cloud storage resources including S3 buckets, Azure blobs, and DigitalOcean Spaces across target environments.
A Chrome extension that automatically detects and lists Amazon S3 buckets while browsing websites.
A tool for enumerating and analyzing Amazon S3 buckets associated with specific targets to identify potential security misconfigurations.
A tool to identify potential subdomain takeovers by checking if a CNAME record resolves to the scope address.
A tool for taking a list of resolved subdomains and outputting any corresponding CNAMES en masse.
A tool for bruteforcing subdomains of a given domain
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.
Cloud platform for continuous visibility & mgmt of external attack surfaces
AI-powered attack surface management platform for cybersecurity monitoring
AI-powered platform for continuous attack surface discovery and pentesting
Discovers and monitors external-facing assets and vulnerabilities
External attack surface mgmt platform for discovering & monitoring assets
External attack surface management platform with continuous asset discovery
External attack surface management platform for discovering digital assets
Preemptive Exposure Management platform for continuous attack surface testing
Platform for offensive security operations including ASM, VA, and DAST
SaaS platform for attack surface management and vulnerability detection
EASM platform for continuous monitoring of internet-exposed assets & vulnerabilities
Supply chain intelligence platform mapping digital ecosystems & proximity risks
Attack surface mgmt platform with vuln scanning and cloud security features
External attack surface mgmt platform with continuous discovery & validation
Attack surface management platform for monitoring vulnerabilities and breaches
Attack surface management platform for automated pentesting and vuln scanning
External threat intelligence platform for attack surface mgmt & data breach prevention
Discovers and monitors external internet assets for exposures and vulnerabilities
AI-driven cyber-surveillance platform for threat detection and monitoring
Discovers and manages internet-facing assets with vulnerability prioritization
External attack surface mgmt with automated pentesting and validation
SOCRadar Attack Surface Management is an EASM platform that continuously discovers, monitors, and assesses internet-facing digital assets for vulnerabilities and security risks.
External attack surface mgmt with asset discovery and on-demand pentesting
Internet intelligence platform for asset discovery and threat analysis
AI-driven internet scanning platform for asset discovery and threat hunting
Attack surface monitoring platform with automated security validation testing
Passive asset discovery platform using Netflow data for attack surface mapping
External attack surface management platform for asset discovery and vuln mgmt
AI-driven EASM platform for discovering and monitoring external-facing assets
External attack surface management platform for asset discovery and risk detection
EASM platform with integrated CTI for asset discovery and vulnerability mgmt
Attack surface management platform with dark web & brand monitoring capabilities
Attack surface discovery platform monitoring digital assets and data exposures
Agentless API attack surface discovery and vulnerability detection platform
Discovers, monitors, and assesses external attack surface assets continuously.
External attack surface management platform for asset discovery and monitoring
Continuous discovery, monitoring, and testing of external assets and exposures
External attack surface management with continuous security testing
EASM platform with continuous asset discovery and threat intelligence context
Continuous external attack surface monitoring with manual pentesting
LLM-powered security platform for finding and fixing security gaps
Customizable ASM platform for asset discovery, monitoring, and enrichment
Internet-connected asset search engine with vulnerability scanning capabilities
Risk prioritization platform for external attack surface management
External attack surface mgmt platform with remediation acceleration features
EASM platform with automated security testing and risk prioritization
Discovers assets, analyzes risks, and prioritizes vulnerabilities across orgs.
Attack surface management platform for asset discovery and vulnerability monitoring
Attack surface management platform for asset discovery and vulnerability monitoring
ASM platform for discovering, monitoring, and prioritizing external/internal assets
CTI-driven external attack surface mgmt with threat exposure prioritization
Cloud-based EASM platform for discovering internet-facing assets & exposures
EASM platform for continuous external attack surface monitoring and detection
External attack surface monitoring with dark web intelligence and scanning
Platform for continuous attack surface discovery, monitoring, and remediation
EASM platform combined with PTaaS for web app discovery and testing
Cyber risk monitoring platform with vulnerability scanning and alerting
Continuously maps digital footprint, identifies exposures & validates exploitability
External risk mgmt platform with threat intel, dark web monitoring, and ASM
External attack surface management platform with AI-powered risk assessment
External attack surface management platform for asset discovery and monitoring
Monitors external attack surface to identify assets and vulnerabilities
Attack surface intelligence platform for threat hunting and asset discovery
External attack surface monitoring with threat intel and brand protection
External attack surface management platform with threat intelligence
Managed attack surface platform for vulnerability detection and remediation
Real-time attack surface monitoring and vulnerability management platform
External cyber risk assessment tool for businesses and portfolios
Cyber risk management platform for SMEs with breach monitoring and training
AI-native platform for autonomous threat monitoring, detection, and remediation
Scans public internet for leaked cloud service keys and verifies them
Cybersecurity risk discovery platform for attack surface management and auditing
EASM platform providing curated threat intelligence for external attack surfaces
AI-powered EASM platform for discovering and prioritizing external risks
Full-spectrum security platform for cyber operations and perimeter defense
AI-driven platform for cyber risk assessment, monitoring, and mitigation.
EASM platform for continuous external attack surface discovery and risk mgmt.
xASM and cyber risk quantification platform with continuous monitoring.
xASM platform covering external, internal, and API attack surfaces.
External attack surface mgmt with CVE scanning & continuous monitoring.
Managed ASM service with 24/7 SOC monitoring for critical infrastructure orgs.
A search engine for the Internet of Things (IoT) that discovers and monitors devices connected to the internet.
Website privacy and security testing tool for cookie and third-party analysis
A platform providing real-time threat intelligence streams and reports on internet-exposed assets to help organizations monitor and secure their attack surface.
A search engine for open Amazon S3 buckets and their contents, allowing users to search for files using keywords, filename extensions, and full path.
ONYPHE is a cyber defense search engine that discovers exposed assets and provides real-time monitoring to identify vulnerabilities and potential risks.
DNSDumpster is a domain research tool for discovering and analyzing DNS records to map an organization's attack surface.
Automate OSINT for threat intelligence and attack surface mapping with SpiderFoot.
Web inventory tool that captures screenshots of webpages and includes additional features for enhanced usability.
A tool that checks for hijackable packages in NPM and Python Pypi registries
Performs network mapping of attack surfaces and external asset discovery using open source information gathering and active reconnaissance techniques.
Scan the internet for publicly exposed network components
A distributed AWS security auditing tool that continuously enumerates and scans internet-facing AWS services to identify potentially misconfigured resources.
A Ruby-based tool that enumerates all public IPv4 and IPv6 addresses associated with an AWS account across multiple services including EC2, CloudFront, ELB, RDS, and others.
A storage exploration tool that provides unified access to view publicly accessible Amazon S3 buckets, Azure Blob storage, FTP servers, and HTTP directory listings.
A tool to discover new target domains using Content Security Policy
Common questions security professionals ask when evaluating alternatives and competitors to Knock.
The most popular alternatives to Knock include Findomain, Amass, censys-enumeration, brutesubs, and assetfinder. These External Attack Surface Management tools offer similar capabilities and are frequently compared by security professionals evaluating their options.
