iptables to UFW Command Converter & Batch Translator

What does the iptables to UFW Command Converter & Batch Translator do?

The iptables to UFW Command Converter & Batch Translator translates raw Linux iptables CLI commands and multi-line iptables-save dumps into clean, modern ufw (Uncomplicated Firewall) rules and ready-to-run bash migration scripts. It accurately maps ports, CIDR subnets, network interfaces, and targets (ACCEPT, DROP, REJECT), while providing explicit edge-case alerts for NAT / port-forwarding rules and automated anti-lockout SSH safeguards.

Core Concepts

Understanding firewall translation from low-level iptables to ufw:

• Syntax Simplification: Transforms verbose kernel Netfilter chains (iptables -A INPUT -s 192.168.1.50 -p tcp --dport 3306 -j ACCEPT) into readable UFW commands (ufw allow from 192.168.1.50 to any port 3306 proto tcp).
• Anti-Lockout Safeguards: Remote server migrations risk disconnecting active SSH sessions if incoming port 22 isn't explicitly permitted prior to firewall activation. The tool automatically injects sudo ufw allow 22/tcp before ufw enable.
• Advanced NAT & Packet Mangling Detection: The UFW CLI does not natively manage NAT (-t nat), PREROUTING, or MASQUERADE directives. The tool flags these rules with explicit instructions to append them into /etc/ufw/before.rules.

How to use the tool?

1. Paste iptables Rules: Paste single CLI commands or multi-line iptables-save exports into the input box or click Load Sample.
2. Toggle Migration Safeguards: Ensure SSH Anti-Lockout (allow 22/tcp) and baseline policy options are configured.
3. Convert & Execute: Click Convert to UFW Commands to generate the .sh migration script. Click Copy or Download to save ufw-migration.sh.

Related Developer Utilities

If you work with Linux servers, network administration, and firewall security, explore these complementary tools:

• CIDR Subnet & IP Calculator: Calculate network ranges, subnet masks, and broadcast IPs.
• Crontab to Systemd Timer Generator: Convert periodic cron tasks into systemd timers.
• Linux Logrotate Config Generator: Generate log rotation configurations for server daemons.
• Rsync Command Generator: Build secure remote file transfer commands.

REST API Integration

Blueutils provides a free REST API endpoint (POST https://blueutils.com/api/linux/iptables-to-ufw) to programmatically convert iptables rules into ufw commands and executable migration scripts.

API Request Parameters

API Request Payload Examples

cURL

curl -X POST https://blueutils.com/api/linux/iptables-to-ufw \
  -H "Content-Type: application/json" \
  -d '{
    "rawText": "iptables -A INPUT -p tcp --dport 22 -j ACCEPT\niptables -A INPUT -p tcp --dport 80 -j ACCEPT\niptables -A INPUT -s 10.0.0.0/8 -j DROP",
    "options": {
      "enableSshSafeguard": true,
      "includeDefaultPolicies": true,
      "enableUfwAtEnd": true
    }
  }'

Python

import requests

url = "https://blueutils.com/api/linux/iptables-to-ufw"
payload = {
    "rawText": "iptables -A INPUT -p tcp --dport 22 -j ACCEPT\niptables -A INPUT -p tcp --dport 80 -j ACCEPT",
    "options": {
        "enableSshSafeguard": True,
        "includeDefaultPolicies": True,
        "enableUfwAtEnd": True
    }
}
headers = {"Content-Type": "application/json"}
response = requests.post(url, json=payload, headers=headers)
print(response.json())

Java

import java.net.URI;
import java.net.http.HttpClient;
import java.net.http.HttpRequest;
import java.net.http.HttpResponse;

public class Main {
    public static void main(String[] args) throws Exception {
        String jsonPayload = """
            {
                "rawText": "iptables -A INPUT -p tcp --dport 80 -j ACCEPT"
            }
            """;

        HttpClient client = HttpClient.newHttpClient();
        HttpRequest request = HttpRequest.newBuilder()
            .uri(URI.create("https://blueutils.com/api/linux/iptables-to-ufw"))
            .header("Content-Type", "application/json")
            .POST(HttpRequest.BodyPublishers.ofString(jsonPayload))
            .build();

        HttpResponse<String> response = client.send(request, HttpResponse.BodyHandlers.ofString());
        System.out.println(response.body());
    }
}

API Response Parameters

API Response Payload Examples

Success Response (HTTP 200 OK)

{
  "isValid": true,
  "totalRulesParsed": 2,
  "translatedRulesCount": 2,
  "ufwCommands": [
    "sudo ufw allow 22/tcp",
    "sudo ufw allow 80/tcp"
  ],
  "shellScript": "#!/usr/bin/env bash\nset -e\nsudo ufw allow 22/tcp\nsudo ufw default deny incoming\nsudo ufw default allow outgoing\nsudo ufw allow 22/tcp\nsudo ufw allow 80/tcp\nsudo ufw --force enable\nsudo ufw status verbose"
}

Validation Failure Response (HTTP 400 Bad Request)

{
  "isValid": false,
  "error": "No translatable iptables rules found in provided input. Expected syntax: iptables -A INPUT ..."
}

Rate Limit Exceeded Response (HTTP 429 Too Many Requests)

{
  "error": "API rate limit exceeded. Please wait or contact support@blueutils.com."
}

Why use an API to convert iptables to UFW?

Integrating the iptables to UFW Translation API into server migration scripts, Ansible playbooks, or AI agent tool calling provides key benefits:

• Automated Infrastructure Migration: Translates legacy firewall initialization dumps directly into idempotent UFW configuration commands during server upgrades.
• Optimized Token Efficiency for AI Agents: LLMs frequently confuse UFW syntax rules regarding port ranges and from ... to any port ... clauses. Calling the API produces verified shell scripts deterministically.
• Deterministic Security Safeguards: Prevents SSH terminal lockouts by enforcing anti-lockout rules before firewall enablement.

Native Usage

How to manage and verify firewall migrations natively in Linux:

Linux / Unix (Bash)

# Export active iptables rules
sudo iptables-save > /tmp/iptables.rules

# Enable UFW baseline policies
sudo ufw default deny incoming
sudo ufw default allow outgoing

# Allow SSH before enabling
sudo ufw allow 22/tcp

# Enable and inspect UFW status
sudo ufw --force enable
sudo ufw status numbered

Windows (PowerShell)

# Copy generated migration script to remote server and execute
scp ufw-migration.sh user@server:/tmp/
ssh -t user@server "chmod +x /tmp/ufw-migration.sh && sudo /tmp/ufw-migration.sh"

Windows (Command Prompt)

:: Copy generated migration script to remote server and execute
scp ufw-migration.sh user@server:/tmp/
ssh -t user@server "chmod +x /tmp/ufw-migration.sh && sudo /tmp/ufw-migration.sh"

Python

Using Python:

import re

def convert_simple_iptables(rule):
    match = re.search(r'--dport\s+(\d+)\s+-j\s+(ACCEPT|DROP)', rule)
    if match:
        port, action = match.group(1), match.group(2)
        ufw_act = 'allow' if action == 'ACCEPT' else 'deny'
        return f"sudo ufw {ufw_act} {port}/tcp"
    return "# Manual translation required"

print(convert_simple_iptables("iptables -A INPUT -p tcp --dport 443 -j ACCEPT"))

Java

Using Java:

public class IptablesToUfwExample {
    public static void main(String[] args) {
        String iptablesRule = "iptables -A INPUT -p tcp --dport 80 -j ACCEPT";
        if (iptablesRule.contains("--dport 80") && iptablesRule.contains("ACCEPT")) {
            System.out.println("sudo ufw allow 80/tcp");
        }
    }
}