IP Range Extractor by Country (IPv4 / IPv6)

This Go program extracts IP address ranges for a specific country from the IP2LOCATION-LITE-DB1 database and writes individual IPs to a text file.

Supports both IPv4 and IPv6 via command-line flags.

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✅ Features

• Parses CSV database from IP2Location (Lite version).
• Supports IPv4 and IPv6 formats.
• Filters IP ranges by 2-letter country code.
• Skips overly large ranges (>10 million IPs).
• Logs all skipped/invalid ranges.
• High performance via Go routines and buffering.

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📦 Requirements

• Go 1.2+
• IP2Location CSV files:
  • IP2LOCATION-LITE-DB1.CSV
  • IP2LOCATION-LITE-DB1.IPV6.CSV

Place the .CSV files in a ./db/ folder.

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🚀 Usage

go run main.go <COUNTRY_CODE> [--v4 | --v6]

Arguments:

• <COUNTRY_CODE>: Two-letter ISO 3166-1 alpha-2 country code (e.g. US, UA, DE).
• --v4: Process IPv4 data from IP2LOCATION-LITE-DB1.CSV.
• --v6: Process IPv6 data from IP2LOCATION-LITE-DB1.IPV6.CSV.

❗ You must specify either --v4 or --v6, not both.

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📁 Output

• Output file:
  • UA.txt for IPv4
  • UA_ipv6.txt for IPv6
• Log file:
  • skipped_UA.log for skipped or invalid ranges

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🧪 Examples

Extract IPv4 for Ukraine:

go run main.go UA --v4

Extract IPv6 for Germany:

go run main.go DE --v6

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⚠ Notes

• Large IP ranges (>10 million addresses) are automatically skipped and logged.
• The program uses goroutines and buffered channels to speed up processing.

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📜 License

This project is provided as-is for educational and utility purposes.

IP data © IP2Location LITE under Creative Commons Attribution-ShareAlike 4.0.