Subdomain enumeration with Subfinder, HTTPX & GPT-4-Mini for security reconnaissance

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Important notice

This workflow is provided as-is. Please review and test before using in production.

1. Workflow Overview

Generates a wordlist of 1,000–15,000 subdomains created by an AI agent by correlating detected technologies and recurring patterns. Objective Assist security researchers, bug bounty hunters, and we...

Best for

SecOps automation workflows
AI Chatbot automation workflows
advanced n8n builders looking for reusable templates

Tools used

n8n-nodes-base.ssh, n8n-nodes-base.httprequest, n8n-nodes-base.code, n8n-nodes-base.extractfromfile, @n8n/n8n-nodes-langchain.openai, n8n-nodes-base.stickynote, n8n-nodes-base.summarize, n8n-nodes-base.webhook

Source and attribution

This workflow is cataloged by N8N Workflows and links back to its original n8n.io source page by Javier Rieiro.

Original n8n.io source

1.1 Workflow description

Title: Subdomain enumeration with Subfinder, HTTPX & GPT-4-Mini for security reconnaissance
Workflow name: Subdomain enumeration with Subfinder, HTTPX & GPT-4-Mini for security reconnaissance

Generates a wordlist of 1,000–15,000 subdomains created by an AI agent by correlating detected technologies and recurring patterns.

Objective

Assist security researchers, bug bounty hunters, and web pentesters in the reconnaissance phase by incorporating an AI agent that generates additional potential subdomains. This enables discovery of assets outside the scope of traditional scans and expands the analyzable attack surface.

How it works

The user uploads a list of domains to scan (scope).
The workflow performs a passive, comprehensive scan using four sources (subfinder, assetfinder, crt.sh, Wayback Machine).
The scan results and detected technologies are passed to an AI agent.
The agent runs in a loop up to 20 iterations, generating new subdomains each pass (average output depends on input and model).
Generated subdomains are validated and deduplicated. Syntax is checked and availability is tested (host active / httpx).

Requirements

SSH access with a root user and the following tools:

It is recommended to use a VPS with SSH because if the scope is very large the workflow will take a long time.

1.2 Logical Blocks

This catalog entry is organized from the workflow JSON. The node-level section below shows the executable blocks available for review before importing the template.

2. Block-by-Block Analysis

Block 1 - SSH Subfinder

Type / Role: n8n-nodes-base.ssh - ssh
Config choices: Version 1

Block 2 - SSH Assetfinder

Type / Role: n8n-nodes-base.ssh - ssh
Config choices: Version 1

Block 3 - WayBack Machine

Type / Role: n8n-nodes-base.httpRequest - httpRequest
Config choices: Version 4.2

Block 4 - Filter Subdomains WayBack Machine

Type / Role: n8n-nodes-base.code - code
Config choices: Version 2

Block 5 - Filter Subdomains Assetfinder

Type / Role: n8n-nodes-base.code - code
Config choices: Version 2

Block 6 - Filter Subdomains Subfinder

Type / Role: n8n-nodes-base.code - code
Config choices: Version 2

Block 7 - TXT to JSON

Type / Role: n8n-nodes-base.extractFromFile - extractFromFile
Config choices: Version 1

Block 8 - SSH HTTPX

Type / Role: n8n-nodes-base.ssh - ssh
Config choices: Version 1

Block 9 - Subdomain Generator AI

Type / Role: @n8n/n8n-nodes-langchain.openAi - openAi
Config choices: Version 1.8

Block 10 - Sticky Note

Type / Role: n8n-nodes-base.stickyNote - stickyNote
Config choices: Version 1

Block 11 - Summarize

Type / Role: n8n-nodes-base.summarize - summarize
Config choices: Version 1.1

Block 12 - Subdomain Format Validation

Type / Role: n8n-nodes-base.code - code
Config choices: Version 2

Block 13 - Webhook

Type / Role: n8n-nodes-base.webhook - webhook
Config choices: Version 2.1

Block 14 - Respond to Webhook

Type / Role: n8n-nodes-base.respondToWebhook - respondToWebhook
Config choices: Version 1.4

Block 15 - Convert Subdomains to TXT

Type / Role: n8n-nodes-base.convertToFile - convertToFile
Config choices: Version 1.1

Block 16 - SSH create subdomains.txt into /tmp/reconAI

Type / Role: n8n-nodes-base.ssh - ssh
Config choices: Version 1

Block 17 - Prettify File Content

Type / Role: n8n-nodes-base.code - code
Config choices: Version 2

Block 18 - crt.sh

Type / Role: n8n-nodes-base.httpRequest - httpRequest
Config choices: Version 4.2

Block 19 - Split AI Response

Type / Role: n8n-nodes-base.splitOut - splitOut
Config choices: Version 1

Block 20 - AI Subdomain Format Validation

Type / Role: n8n-nodes-base.code - code
Config choices: Version 2

Block 21 - Rename crt.sh Content

Type / Role: n8n-nodes-base.set - set
Config choices: Version 3.4

Block 22 - Merge all Results

Type / Role: n8n-nodes-base.merge - merge
Config choices: Version 3.2

Block 23 - Unique Subdomains

Type / Role: n8n-nodes-base.code - code
Config choices: Version 2

Block 24 - Append all Loop Items

Type / Role: n8n-nodes-base.code - code
Config choices: Version 2

Showing the first 24 of 48 workflow blocks. Download the JSON for the full node graph.

3. Summary Table

Workflow	Subdomain enumeration with Subfinder, HTTPX & GPT-4-Mini for security reconnaissance
Complexity	advanced
Nodes	48
Categories	SecOps, AI Chatbot
Author	Javier Rieiro
Published	15 Oct 2025

4. Reproducing the Workflow from Scratch

1. Download the workflow JSON

Use the JSON export at /data/workflows/9735/9735.json as the source template for this automation.
2. Import the template into n8n

Open n8n, import the downloaded JSON, and review each node before activating the workflow.
3. Configure credentials and variables

Replace placeholder credentials, API keys, webhook URLs, account IDs, and environment-specific values with your own settings.
4. Test with sample data

Run the workflow manually or in a staging workspace, inspect node output, and confirm downstream systems receive the expected data.
5. Activate and monitor

Enable the workflow only after testing, then monitor executions, errors, and rate limits during the first production runs.

5. General Notes & Resources

Review imported nodes carefully before activation. This catalog entry is intended to help you inspect the workflow structure, understand required services, and find related templates faster.

Node names, credentials, schedules, webhook paths, and external service limits may need adjustment for your workspace.

Download workflow JSON Original n8n.io source SecOps workflows AI Chatbot workflows

Frequently asked questions

What does Subdomain enumeration with Subfinder, HTTPX & GPT-4-Mini for security reconnaissance do?

What do I need before importing this workflow?

Review the workflow JSON, configure any required credentials in n8n, and test the automation in a safe workspace before using it in production.

Can I customize this workflow?

Yes. Use the block-by-block analysis and the downloadable JSON to inspect each node, then adjust credentials, prompts, schedules, filters, or destinations for your SecOps, AI Chatbot use case.

Javier Rieiro

4 workflows

Nodes

n8n-nodes-base.ssh n8n-nodes-base.httprequest n8n-nodes-base.code n8n-nodes-base.extractfromfile @n8n/n8n-nodes-langchain.openai n8n-nodes-base.stickynote n8n-nodes-base.summarize n8n-nodes-base.webhook

Complexity

advanced

Published 15 Oct 2025

Likes 0

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Install path: /data/workflows/9735/9735.json

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Subdomain enumeration with Subfinder, HTTPX & GPT-4-Mini for security reconnaissance

Workflow preview

Important notice

1. Workflow Overview

Best for

Tools used

Source and attribution

1.1 Workflow description

Objective

How it works

Requirements

1.2 Logical Blocks

2. Block-by-Block Analysis

Block 1 - SSH Subfinder

Block 2 - SSH Assetfinder

Block 3 - WayBack Machine

Block 4 - Filter Subdomains WayBack Machine

Block 5 - Filter Subdomains Assetfinder

Block 6 - Filter Subdomains Subfinder

Block 7 - TXT to JSON

Block 8 - SSH HTTPX

Block 9 - Subdomain Generator AI

Block 10 - Sticky Note

Block 11 - Summarize

Block 12 - Subdomain Format Validation

Block 13 - Webhook

Block 14 - Respond to Webhook

Block 15 - Convert Subdomains to TXT

Block 16 - SSH create subdomains.txt into /tmp/reconAI

Block 17 - Prettify File Content

Block 18 - crt.sh

Block 19 - Split AI Response

Block 20 - AI Subdomain Format Validation

Block 21 - Rename crt.sh Content

Block 22 - Merge all Results

Block 23 - Unique Subdomains

Block 24 - Append all Loop Items

3. Summary Table

4. Reproducing the Workflow from Scratch

1. Download the workflow JSON

2. Import the template into n8n

3. Configure credentials and variables

4. Test with sample data

5. Activate and monitor

5. General Notes & Resources

Frequently asked questions