hakrevdns — Reconnaissance | Tools

Description

hakrevdns performs fast, mass reverse DNS lookups. Given a list of IP addresses, it resolves them to hostnames. Useful for discovering additional assets, internal hostnames, and expanding attack surface during reconnaissance.

Installation

BASH

go install github.com/hakluke/hakrevdns@latest

Basic Usage

                        BASH
                        
                            # Reverse DNS lookup from stdin
echo "93.184.216.34" | hakrevdns

# From file
cat ips.txt | hakrevdns

# With domain filter
cat ips.txt | hakrevdns -d target.com

Advanced Usage

                        BASH
                        
                            # Custom resolver
cat ips.txt | hakrevdns -r 8.8.8.8:53

# Concurrent threads
cat ips.txt | hakrevdns -t 50

# Output only domains
cat ips.txt | hakrevdns | awk '{print $2}' | sed 's/\.$//' | sort -u

Common Workflows

                        BASH
                        
                            # Discover all hosts in a CIDR range
prips 10.0.0.0/24 | hakrevdns -t 100 | grep target.com

# Expand attack surface from known IPs
nmap -sn 93.184.216.0/24 -oG - | grep "Up" | awk '{print $2}' | hakrevdns

# Find related infrastructure
echo "93.184.216.34" | hakrevdns | awk '{print $2}' | sed 's/\.$//'