Sans

Sans is a lightweight Go tool that resolves subdomains from a provided list, retrieves their associated IP addresses, and fetches ASN (Autonomous System Number) information along with the owning company (organization) details using the IPInfo.io API. It also saves unique IPs and ASNs to ip.txt and asn.txt respectively.

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Features

• Subdomain Resolution: Reads a list of subdomains from a file and resolves their IP addresses.
• IP Information Retrieval: For each IP, fetches ASN and organization details using the IPInfo.io API.
• Formatted Output: Displays output in a colorized, easy-to-read format.
• Results Storage: Saves unique IP addresses and ASN numbers into ip.txt and asn.txt.

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Installation

Prerequisites

• Go 1.18+: Download and install Go from the official Go downloads page.
• IPInfo.io token: You will need a valid token from IPInfo.io to use this tool. You can sign up for a free plan,

Using go install

You can install Sans directly using go install:

go install github.com/samidunimsara/sans@latest

Usage

Once installed, run Sans from the command line with the required flags.

Command-line Options

• -l: Path to a file containing a list of subdomains (one per line).
• -t: Your IPInfo.io API token.

sans -l subdomains.txt -t YOUR_API_TOKEN

This will:

1. Resolve each subdomain in the subdomains.txt file.
2. Retrieve the IP information for each resolved subdomain, including ASN and organization (owned company) name.
3. Display output in the following format:

subdomain_name IP_address ASN organization_name

For example:

breeno.test.com 123.345.345.444 AS222 ABC ORG
breenofs.test.testcom 222.33.3.54 AS234 IDC, US  Telecommunications Corporation

4. Save unique IP addresses to ip.txt and ASN numbers to asn.txt.