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DNS Enumeration

DNS enumeration is the process of locating all the DNS servers and their corresponding records for an organization. DNS enumeration will yield usernames, computer names, and IP addresses of potential target systems. The list of DNS record provides an overview of types of resource records (database records) stored in the zone files of the Domain Name System (DNS). The DNS implements a distributed, hierarchical, and redundant database for information associated with Internet domain names and addresses.

DNS Zone Transfer used to replicate DNS data across a number of DNS servers or to back up DNS files. A user or server will perform a specific zone transfer request from a ?name server. If the name server allows zone transfers by an anonymous user to occur, all the DNS names and IP addresses hosted by the name server will be returned in human-readable ASCII text.

Tools:

nslookup, maltego, dnenum,dnsrecon

Countermeasures:

Disable Zone transfer by untrusted hosts
Ensure that private hostnames are not referenced to IP addresses within the DNS zone files of publicly accessible DNS servers.
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What is Hacking? What is Ethical Hacking? Who is an Ethical Hacker?

CIA Triangle Important characteristics of Information Security, Functionality and Usability Triangle Phases of Hacking Different types of attacks Vulnerability Assessment Penetration Testing Information Security Laws, Standards and frameworks

What is Footprinting Objectives of Footprinting Footprinting Methodology

What is Scanning? Network Scanning Scanning Methodology

Enumeration and its Types NetBIOS Enumeration SNMP Enumeration LDAP Enumeration NTP Enumeration SMTP Enumeration DNS Enumeration

Goals of System Hacking Gaining Access Privilege Escalation Executing Applications Hiding Files Covering Tracks

Introduction to Malware Threats and its Types Virus Trojans Worms Rootkits, Spyware and Ransomware How to Detect Malicious Software

Sniffing and its Types ARP and CAM Table Active Sniffing Attacks DHCP Poisoning

Social Engineering and its Attacks Computer and Mobile Based Social Engineering

Denial of Service attacks and its Types

Session Hijacking and its Types Session Hijacking Process Session Hijacking Levels Network or TCP Session Hijacking

Web Server and its Types of Attacks

Web Application and its types of Attacks Injection Flaws Cross-Site Scripting Web Services Attacks Hacking Methodology

Introduction to SQL Injection Types of SQL Injection

Introduction to Hacking Wireless Networks Encryption Types Wi-Fi Attacks

Introduction to Hacking Mobile Devices Android Types of Android Attacks IOS Mobile Device Management

Firewall IDS: Intrusion Detection System Ways of Detecting Attacks

Introduction to Cryptography PKI: Public Key Infrastructure SSL: Secure Socket Layer

Introduction to Cloud Computing Types of Cloud Computing Benefits, Threats, and Attacks on Cloud Computing Security in Cloud

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DNS Enumeration

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