# 46 CFR § 10.207: Identification number

> Federal · Regulations · In force

URL: https://www.frixlaw.com/law-library/statutes/ecfr-46-10.207

## Section

- **Citation:** 46 CFR § 10.207
- **Heading:** Identification number
- **Jurisdiction:** Federal
- **Kind:** Regulations
- **Status:** In force
- **Text as of:** September 22, 2026
- **Source:** Publisher's official text
- **Location:** Title 46—Shipping > CHAPTER I—COAST GUARD, DEPARTMENT OF HOMELAND SECURITY > SUBCHAPTER B—MERCHANT MARINE OFFICERS AND SEAMEN > PART 10—MERCHANT MARINER CREDENTIAL > Subpart B—General Requirements for All Merchant Mariner Credentials

## Text

For recordkeeping purposes only, a mariner's official MMC identification number is the individual's social security number. However, a unique serial number, called the mariner reference number, and not the social security number, will appear on the credential.
[USCG-2006-24371, 74 FR 11216, Mar. 16, 2009, as amended by USCG-2004-17914, 78 FR 77888, Dec. 24, 2013]

## Nearby sections

- [46 CFR § 10.101 § 10.101 Purpose.](https://www.frixlaw.com/law-library/statutes/ecfr-46-10.101.md)
- [46 CFR § 10.103 § 10.103 Incorporation by reference.](https://www.frixlaw.com/law-library/statutes/ecfr-46-10.103.md)
- [46 CFR § 10.107 § 10.107 Definitions in subchapter B.](https://www.frixlaw.com/law-library/statutes/ecfr-46-10.107.md)
- [46 CFR § 10.109 § 10.109 Classification of endorsements.](https://www.frixlaw.com/law-library/statutes/ecfr-46-10.109.md)
- [46 CFR § 10.201 § 10.201 General characteristics of the Merchant Mariner Credential.](https://www.frixlaw.com/law-library/statutes/ecfr-46-10.201.md)
- [46 CFR § 10.203 § 10.203 Requirement to hold a TWIC and a Merchant Mariner Credential.](https://www.frixlaw.com/law-library/statutes/ecfr-46-10.203.md)
- [46 CFR § 10.205 § 10.205 Validity of a Merchant Mariner Credential.](https://www.frixlaw.com/law-library/statutes/ecfr-46-10.205.md)
- [46 CFR § 10.207 § 10.207 Identification number.](https://www.frixlaw.com/law-library/statutes/ecfr-46-10.207.md)
- [46 CFR § 10.209 § 10.209 General application procedures.](https://www.frixlaw.com/law-library/statutes/ecfr-46-10.209.md)
- [46 CFR § 10.211 § 10.211 Criminal record review.](https://www.frixlaw.com/law-library/statutes/ecfr-46-10.211.md)
- [46 CFR § 10.213 § 10.213 National Driver Register.](https://www.frixlaw.com/law-library/statutes/ecfr-46-10.213.md)
- [46 CFR § 10.214 § 10.214 Security Check.](https://www.frixlaw.com/law-library/statutes/ecfr-46-10.214.md)
- [46 CFR § 10.217 § 10.217 Merchant Mariner Credential application and examination locations.](https://www.frixlaw.com/law-library/statutes/ecfr-46-10.217.md)
- [46 CFR § 10.219 § 10.219 Fees.](https://www.frixlaw.com/law-library/statutes/ecfr-46-10.219.md)

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Source: Frix Law Library, https://www.frixlaw.com/law-library/statutes/ecfr-46-10.207. Check the current official text before relying on it. Not legal advice.