OWASP Amass – DNS Enumeration, Attack Surface Mapping & External Asset Discovery


The OWASP Amass Project is a DNS Enumeration, Attack Surface Mapping & External Asset Discovery tool to help information security professionals perform network mapping of attack surfaces and perform external asset discovery using open source information gathering and active reconnaissance techniques.

OWASP Amass - DNS Enumeration, Attack Surface Mapping & External Asset Discovery


Information Gathering Techniques Used by OWASP Amass for DNS Enumeration and More

The main functionality of Amass is as follows:

  • DNS: Basic enumeration, Brute forcing (optional), Reverse DNS sweeping, Subdomain name alterations/permutations, Zone transfers (optional)
  • Scraping: Ask, Baidu, Bing, DNSDumpster, DNSTable, Dogpile, Exalead, Google, HackerOne, IPv4Info, Netcraft, PTRArchive, Riddler, SiteDossier, ViewDNS, Yahoo
  • Certificates: Active pulls (optional), Censys, CertSpotter, Crtsh, Entrust, GoogleCT
  • APIs: AlienVault, BinaryEdge, BufferOver, CIRCL, CommonCrawl, DNSDB, GitHub, HackerTarget, IPToASN, Mnemonic, NetworksDB, PassiveTotal, Pastebin, RADb, Robtex, SecurityTrails, ShadowServer, Shodan, Spyse (CertDB & FindSubdomains), Sublist3rAPI, TeamCymru, ThreatCrowd, Twitter, Umbrella, URLScan, VirusTotal, WhoisXML
  • Web Archives: ArchiveIt, ArchiveToday, Arquivo, LoCArchive, OpenUKArchive, UKGovArchive, Wayback

Usage of Amass for DNS Enumeration, Attack Surface Mapping & External Asset Discovery

The Amass tool has several subcommands shown below for handling your Internet exposure investigation.

  • intel – Collect open-source intelligence for investigation of the target organization
  • enum – Perform DNS enumeration and network mapping of systems exposed to the Internet
  • viz – Generate visualizations of enumerations for exploratory analysis
  • track – Compare results of enumerations against common target organizations
  • db – Manage the graph databases storing the enumeration results

Each subcommand has its own arguments, for example, the ‘intel’ subcommand.

The intel subcommand can help you discover additional root domain names associated with the organization you are investigating. The data source sections of the configuration file are utilized by this subcommand in order to obtain passive intelligence, such as reverse whois information.

It has some visualization capabilities and can also output to other tools and in various formats such as D3.js, GEXF, Graphistry JSON, VisJS and Maltego format.

You can download Amass here:

Linux: amass_v3.4.2_linux_amd64.zip
Windows: amass_v3.4.2_windows_amd64.zip
Source: Amass-v3.4.2.zip

Or read more here.

Posted in: Hacking Tools


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