Attack Surface Management (ASM) is the practice of continuously identifying, inventorying, and monitoring all external-facing assets belonging to an organization — from IP addresses and cloud storage buckets to ASN ranges, subdomains, and third-party SaaS integrations. As organizations grow and adopt cloud-native architectures, their digital footprint expands faster than security teams can track manually. ASM tools automate this discovery process, giving defenders an outside-in view of what attackers see when they target an organization. During penetration tests and red team engagements, these same tools let security professionals map an organization’s exposure with the same accuracy and breadth that a real adversary would.Documentation Index
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FullHunt.io
Attack surface database of the entire Internet — comprehensive asset discovery and monitoring.
BinaryEdge
We scan the web and gather data for you — internet scanning with structured threat intelligence.
Censys ASM
Attack Surface Management Solutions — continuous discovery and monitoring of internet-facing assets.
RedHunt Labs
Discover your Attack Surface, Continuously — automated recon and exposure management.
SecurityTrails
The Total Internet Inventory — historical DNS, WHOIS, and IP intelligence at scale.
overcast-security.com
We make tracking your external attack surface easy.
IPInfo.io
The trusted source for IP address data — geolocation, ASN, and company attribution.
IPData.co
IP Geolocation and Threat Intelligence API — enrich IPs with threat and org context.
NetworksDB
Information about the public IPv4 and IPv6 addresses, networks and domains owned by companies and organisations across the world.
ASNlookup
Quickly lookup updated information about specific Autonomous System Number (ASN), Organization, CIDR, or registered IP addresses (IPv4 and IPv6) among other relevant data.
BGPtools
Browse the Internet ecosystem — BGP routing tables, ASN data, and peering intelligence.
BGPview
Debug and investigate information about IP addresses, ASN, IXs, BGP, ISPs, Prefixes and Domain names.
BigDataCloud
The API provides comprehensive location and network data.
RADb
The world’s largest public routing registry — authoritative BGP routing policy data.
Deepinfo
Empower your security with the most comprehensive Internet data.
CloudFlare Radar
Global Internet traffic, attack, and technology trends and insights.
IPIP
The only IP Database based on real time BGP/ASN data analytics.
Hurricane Electric BGP
The Hurricane Electric BGP Toolkit is free to use. Look up ASN from IP address.
Webscout
From threat intelligence to attack surface discovery, asset management, and brand protection.
Awseye
Open-source intelligence (OSINT) and reconnaissance service tracking publicly accessible AWS data.
S4E
Continuous Threat Exposure Management platform for comprehensive scanning and vulnerability detection of digital assets like domains, subdomains, IP addresses, and web apps.
ipquery.io
The IP Address API for Developers.
domaincodex.com
Research 500m+ root domain information and all associated data, including records, IP address, page metadata and much more.
APIfreaks.com
Unified API hub providing DNS, WHOIS, IP geolocation, screenshots and commodity data APIs for developers and security teams.
HackMyIP
Free privacy and security toolkit with 19+ tools including IP lookup, DNS lookup, DNS leaks test and many others.
Attack Surface Management in Practice
Modern attack surface management goes far beyond a simple port scan. Continuous monitoring platforms track changes over time — alerting when a new subdomain appears, a cloud bucket becomes public, or an unintended service is exposed on a previously clean IP. During penetration tests, these tools accelerate the initial reconnaissance phase by rapidly enumerating IP ranges, ASNs, cloud resources, and third-party technology relationships. During red team engagements, they help operators identify the most likely entry points an adversary would exploit. For blue teams and defenders, they provide the outside-in perspective needed to prioritize remediation, reduce mean time to detect (MTTD), and ensure that no asset goes unmonitored. ASN and BGP tools are particularly valuable for discovering an organization’s full IP range ownership, which is often broader than what appears in a simple WHOIS lookup. Cloud-specific tools like Awseye help surface publicly accessible AWS resources that may have been accidentally exposed.Attack surface tools are especially valuable during the initial reconnaissance phase of a penetration test or red team engagement.