Tools

Asnmap: Go CLI and Library for quickly mapping organization network ranges using ASN information

, and Dark Web Informer

August 5, 2025 . 6:28 PM

1 min read

GitHub: https://github.com/projectdiscovery/asnmap

asnmap is a fast and flexible tool by ProjectDiscovery to look up ASN and CIDR ranges from a wide variety of input formats — IPs, domains, organizations, or ASNs. Perfect for OSINT, threat recon, or attack surface mapping.

✨ Key Features

ASN → CIDR lookup
ORG → CIDR lookup
DNS → CIDR lookup
IP → CIDR lookup
Supports input via ASN/DNS/IP/ORG
JSON, CSV, and plain text output formats
STDIN and STDOUT support for chaining
Built-in support for piping into tools like naabu, httpx, dnsx, tlsx, nuclei

⚙️ Installation

Requires Go 1.21+

bashCopyEditgo install github.com/projectdiscovery/asnmap/cmd/asnmap@latest

Or download binaries from the release page.

🧪 Example Usage

bashCopyEditasnmap -h

Input Examples

bashCopyEditasnmap -a AS45596 -silent
asnmap -i 100.19.12.21 -silent
asnmap -d hackerone.com -silent
asnmap -org GOOGLE -silent

You can also pipe input directly:

bashCopyEditecho GOOGLE | ./asnmap -silent

🔐 Authentication

asnmap uses the ProjectDiscovery Cloud Platform and requires an API key.

Using Environment Variable

bashCopyEditexport PDCP_API_KEY=your_api_key

Using Interactive Auth

bashCopyEditasnmap -auth

📤 Output Options

-json: JSON output
-csv: CSV output
-o <file>: Save results to file
-silent: Clean output
-v6: Show IPv6 CIDRs
-verbose: Debug/verbose output

📦 Output Example

CIDR (Default Output)

bashCopyEdit8.8.4.0/24
8.8.8.0/24

JSON Output

jsonCopyEdit{ "timestamp": "...", "input": "hackerone.com", "as_number": "AS13335", "as_name": "CLOUDFLARENET", "as_country": "US", "as_range": [ "104.16.0.0/14", "104.20.0.0/16" ] }