ResoDNS

Mass DNS Resolution & Subdomain Bruteforce with Wildcard Filtering

Built on massdns — optimized for large-scale enumeration.

Linux / WSL

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Overview

ResoDNS is a high‑performance DNS resolver and subdomain bruteforcer.

Features

• Fast bulk domain resolution
• Subdomain bruteforce from wordlists
• Wildcard DNS detection & filtering
• Trusted resolver validation
• Template-based dynamic subdomain generation
• Full stdin / stdout piping support

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Installation

Requirements

• Go
• massdns binary
• Resolvers file (one IP per line)

Install (recommended)

go install github.com/l4tr0d3ctism/ResoDNS@latest

The binary is installed as resodns (see GOBIN or $GOPATH/bin).

Build from source

git clone https://github.com/l4tr0d3ctism/ResoDNS.git
cd ResoDNS
go build -o resodns .

WSL Note

If massdns fails with GLIBC errors:

bash scripts/build-massdns-wsl.sh

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Usage

Resolve

# From file
./resodns resolve domains.txt -r resolvers.txt

# From stdin
cat domains.txt | ./resodns resolve - -r resolvers.txt

# Save output
./resodns resolve domains.txt -r resolvers.txt -w found.txt

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Bruteforce

# Single domain
./resodns bruteforce wordlist.txt example.com -r resolvers.txt

# Multiple domains
./resodns bruteforce wordlist.txt -d domains.txt -r resolvers.txt

# Save output
./resodns bruteforce wordlist.txt example.com -r resolvers.txt -w found.txt

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Pipelining Examples

subfinder -d example.com -silent | ./resodns resolve - -r resolvers.txt

amass enum -passive -d example.com | ./resodns resolve - -r resolvers.txt

cat wordlist.txt | ./resodns bruteforce - example.com -r resolvers.txt

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Template Syntax

Generate subdomains dynamically.

Pattern	Description
[1-5]	Numeric range
[0-20:5]	Range with step
[file:words.txt]	Values from file

Examples:

./resodns bruteforce --template "api[1-5].example.com" -r resolvers.txt

./resodns bruteforce --template "[file:prefixes.txt].example.com" -r resolvers.txt

./resodns bruteforce --template "app[1-3]-[file:env.txt].example.com" -r resolvers.txt

Multiple placeholders expand as Cartesian product.

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Key Options

Resolvers

• -r, --resolvers → Public resolvers file
• --resolvers-trusted → Trusted resolvers (default: 8.8.8.8, 8.8.4.4)
• -b, --bin → Path to massdns binary

Performance

• -l, --rate-limit
• --rate-limit-trusted
• -t, --threads

Wildcard

• -n, --wildcard-tests
• --wildcard-batch
• --skip-wildcard-filter

Output

• -w, --write
• --write-wildcards
• --write-massdns

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Windows

massdns has no official Windows build.

Recommended: use WSL.