vessel-validator 0.1.1

Professional MMSI and IMO number validator for maritime applications

IMO and MMSI Validator

A comprehensive Python library for validating International Maritime Organization (IMO) numbers and Maritime Mobile Service Identity (MMSI) numbers according to international maritime standards.

Developed by Scitus Solutions Ltd. - Maritime Software Solutions.

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Features

IMO Number Validation

✅ Mathematical check digit verification (catches ~90% of typos) ✅ Format validation (7 digits after "IMO" prefix) ✅ Range validation (>= 1000000) ✅ Era estimation (vessel construction period) ✅ Historical warnings for older vessels (< 6000000) ✅ Support for both ship and company IMO numbers

MMSI Number Validation

✅ MID (Maritime Identification Digits) country code verification ✅ 8 MMSI type detection (ship, coast, group, handheld, SAR, AtoN, SART, craft) ✅ 200+ MID to country mappings ✅ Type-specific format validation ✅ International voyage compliance warnings ✅ Suspicious pattern detection

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Installation

pip install vessel-validator

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Quick Start

IMO Number Validation

from vessel_validator import validate_imo

# Validate an IMO number
result = validate_imo("9074729")

print(f"Valid: {result.valid}")
print(f"Normalized: {result.normalized}")  # "IMO9074729"
print(f"Check digit: {result.info['check_digit']}")
# {'calculated': 9, 'actual': 9, 'valid': True}

if result.errors:
    print(f"Errors: {result.errors}")
if result.warnings:
    print(f"Warnings: {result.warnings}")

MMSI Number Validation

from vessel_validator import validate_mmsi

# Validate an MMSI number
result = validate_mmsi("366123000")

print(f"Valid: {result.valid}")
print(f"Type: {result.info['type']}")          # "ship_station"
print(f"Country: {result.info['country']}")    # "United States of America"
print(f"MID: {result.info['mid']}")            # "366"

Using the Validator Class

from vessel_validator import VesselIdentifierValidator

validator = VesselIdentifierValidator()

# Validate IMO
imo_result = validator.validate_imo("IMO 9074729")

# Validate MMSI
mmsi_result = validator.validate_mmsi("232123000")

# Batch validation
imo_batch = validator.validate_imo_batch(["9074729", "9176187", "8814275"])
print(f"Success rate: {imo_batch['summary']['success_rate']}")

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Validation Examples

✅ Valid IMO Number

result = validate_imo("9074729")
# ✓ Valid
# Check digit: 9 (calculated: 9) ✓
# Era: 2010s-2020s

❌ Invalid IMO Number (Wrong Check Digit)

result = validate_imo("9074728")
# ✗ Invalid
# Error: "Invalid IMO number: check digit validation failed. Expected 9, got 8"

✅ Valid Ship Station MMSI

result = validate_mmsi("366123000")
# ✓ Valid
# Type: ship_station
# Country: United States of America
# MID: 366

✅ Valid SAR Aircraft MMSI

result = validate_mmsi("111232000")
# ✓ Valid
# Type: sar_aircraft
# Country: United Kingdom
# MID: 232

❌ Invalid MMSI (Unknown Type)

result = validate_mmsi("123456789")
# ✗ Invalid
# Error: "Invalid MMSI format: MMSI starting with '1' must be SAR aircraft (111XXXXXX)"

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API Reference

validate_imo(imo, **kwargs)

Validate an IMO number.

Parameters:

• imo (str): The IMO number to validate (e.g., "IMO 9074729" or "9074729")
• number_type (str, optional): Type of IMO number ('ship', 'company', 'auto'). Default: 'ship'
• strict_format (bool, optional): If True, require "IMO" prefix. Default: False
• allow_without_prefix (bool, optional): If True, accept numbers without "IMO" prefix. Default: True

Returns: ValidationResult

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validate_mmsi(mmsi, **kwargs)

Validate an MMSI number.

Parameters:

• mmsi (str): The MMSI number to validate (9 digits)
• mmsi_type (str, optional): Expected MMSI type ('auto' to detect automatically). Default: 'auto'
• expected_country (str, optional): Expected country name for MID validation
• strict_format (bool, optional): If True, reject any formatting issues. Default: False

Returns: ValidationResult

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ValidationResult

Dataclass containing validation results:

@dataclass
class ValidationResult:
    valid: bool                    # True if validation passed
    normalized: str                # Normalized format (e.g., "IMO9074729")
    errors: List[str]              # List of error messages
    warnings: List[str]            # List of warning messages
    info: Dict[str, Any]           # Additional information

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MMSI Types Supported

Type	Format	Example	Description
Ship Station	2-7XXXXXX	366123000	Most common - vessel identification
Coast Station	00MIDXXXX	002470002	Shore-based communication
Group Station	0MIDXXXXX	023200002	Fleet operations
Handheld VHF	8MIDXXXXX	836612345	Personal VHF radios
SAR Aircraft	111MIDXXX	111232000	Search and rescue aircraft
AIS AtoN	99MIDXXXX	992320001	Navigation aids (buoys, beacons)
AIS SART	970XXYYYY	970123456	Emergency beacons
Craft Associated	98MIDXXXX	982320001	Tenders, pilot boats

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MID Country Mapping

The validator includes mappings for 200+ MID codes to their respective countries:

MID Range	Country	Example
201-210	Albania, Andorra, Austria, etc.	203 → Austria
232-235	United Kingdom	232 → United Kingdom
303-369	United States of America	366 → USA
316	Canada	316 → Canada
503	Australia	503 → Australia
636-637	Liberia	636 → Liberia

Full MID list available at: https://www.itu.int/en/ITU-R/terrestrial/fmd/Pages/mid.aspx

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IMO Check Digit Algorithm

Ship IMO Numbers

Formula: (d1×7 + d2×6 + d3×5 + d4×4 + d5×3 + d6×2) mod 10

Example: IMO 9074729

Digits:    9    0    7    4    7    2    [9]
Weights:   ×7   ×6   ×5   ×4   ×3   ×2
Products:  63 + 0 + 35 + 16 + 21 + 4 = 139
Check:     139 mod 10 = 9 ✓

Company IMO Numbers

Formula: (11 - ((d1×8 + d2×6 + d3×4 + d4×2 + d5×9 + d6×7) mod 11)) mod 10

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Use Cases

Maritime Software Development

• Ballast Water Reporting Forms (BWRF) validation
• Port State Control systems
• Vessel tracking and identification
• Maritime regulatory compliance systems
• Ship registration databases

Data Quality & Cleaning

• Validate vessel identifiers in databases
• Detect typos and data entry errors
• Standardize IMO/MMSI formats
• Enrich vessel data with country information

API Integration

• Validate user input in web forms
• API endpoint data validation
• Batch import validation
• Data migration quality checks

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Development

Running Tests

git clone https://github.com/scitus-ca/vessel-validator.git
cd vessel-validator
python -m pytest tests/

Running Examples

python examples/basic_usage.py
python examples/batch_validation.py

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Standards Compliance

• ✅ IMO Compliance: Check digit verification per IMO standards
• ✅ ITU Compliance: MID validation per ITU-R M.585 recommendation
• ✅ SOLAS Compliance: International voyage MMSI validation

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Contributing

Contributions are welcome! Please feel free to submit a Pull Request.

1. Fork the repository
2. Create your feature branch (git checkout -b feature/amazing-feature)
3. Commit your changes (git commit -m 'Add some amazing feature')
4. Push to the branch (git push origin feature/amazing-feature)
5. Open a Pull Request

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License

This project is licensed under the MIT License - see the LICENSE file for details.

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About Scitus Solutions Ltd.

Scitus Solutions Ltd. specializes in maritime software solutions, including ballast water management systems, port state control applications, and vessel tracking systems.

• Website: https://scitus.ca
• Email: [e-mail]
• GitHub: https://github.com/scitus-ca

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Changelog

Version 1.0.0 (2025-01-16)

• ✨ Initial release
• ✅ IMO number validation with check digit verification
• ✅ MMSI number validation with MID country mapping
• ✅ Support for 8 MMSI types
• ✅ 200+ MID to country mappings
• ✅ Batch validation support
• ✅ Comprehensive test suite
• ✅ Full documentation

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Support

If you encounter any issues or have questions:

• 📫 Email: [e-mail]
• 🐛 Bug Reports: https://github.com/scitus-ca/vessel-validator/issues
• 📖 Documentation: https://github.com/scitus-ca/vessel-validator#readme

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Made with ❤️ by Scitus Solutions Ltd. for the maritime community