ASNinformer

ASNinformer -- a lightweight tool that takes IPs as input, looks up their ASN information, and groups results by ASN in a JSON file.

---

ASNinformer is a simple Python script that takes IP addresses as input, queries their ASN (Autonomous System Number) information via ip2asn.ipinfo.app, groups IPs by ASN, and saves the results as a JSON file.

It is designed to work with stdin (piping) or direct command-line arguments.

---

Features

• Accepts IPs from:
  • Standard input (stdin)
  • Command-line arguments\
• Automatically groups IPs by ASN\
• Saves results in JSON format\
• Optional verbose output\
• Optional proxy support\
• Uses a simple regex-based IPv4 validator

Installation

Clone the repository:

git clone https://github.com/NakuTenshi/ASNinformer.git
cd ASNinformer

Make the script executable:

chmod +x ASNinformer.py

then install the script:

sudo ./install

---

Usage

1️⃣ Using stdin (recommended)

echo 1.1.1.1 | ASNinformer

cat ips.txt | ASNinformer

Example ips.txt:

1.1.1.1
8.8.8.8
9.9.9.9

---

2️⃣ Passing IPs as arguments

ASNinformer 1.1.1.1

ASNinformer 1.1.1.1 8.8.8.8

---

Options

Flag	Description
-p, --proxy	Use an HTTP/HTTPS proxy
-v	Print detailed ASN results to the terminal
-o	Output file name (default: ./asn-result.txt)

Examples

Save results to custom file

echo 8.8.8.8 | ASNinformer -o results.json

Use a proxy

echo 8.8.8.8 | ASNinformer -p http://127.0.0.1:8080

Print results in terminal (verbose mode)

echo 1.1.1.1 | ASNinformer -v

---

Output Format

The script outputs a JSON file structured like this:

{
  "AS15169": {
    "ASN": "AS15169",
    "ASN url": "https://bgp.he.net/AS15169",
    "CIDR": "8.8.8.0/24",
    "company's name": "Google LLC",
    "IPs": [
      "8.8.8.8"
    ]
  }
}

Each ASN entry contains: - ASN number\

• Link to BGP info (bgp.he.net)\
• Announced CIDR\
• Company name\
• List of IPs belonging to that ASN (that given as input to code)

---

created by: NakuTenshi