• https://www.oecd.org/tax/automatic-exchange/crs-implementation-and-assistance/tax-identification-numbers/Brunei-darussalam-TIN%20.pdf

  There is no TIN issued for Entities. In the absence of TIN, the functional equivalent for entities in Brunei are as follows:
  PXXXXXXXX – Standard registration number issued to Sole-Proprietorships or Partnerships registered under the Brunei’s Business Names Act, Chapter 92 (BNA).
  RCXXXXXXXX – Standard registration number issued to Private Limited Companies and Public Companies incorporated under the Brunei’s Companies Act, Chapter 39 (CA).
  RFCXXXXXXXX – Standard registration number issued to Foreign Branch of companies registered under the Brunei’s Companies Act, Chapter 39.
  All of the above registration numbers are issued by the Registry of Companies and Business Names Division, Ministry of Finance.

• According to page 9 of https://www.energy.gov.bn/Shared%20Documents/LBD/Directives%20and%20Guidelines/Oil%20and%20Gas%20Business%20Reporting%20Guideline.pdf (attached here just in case) previously there were ROC numbers, which are now the newer ROCBN (whose format matches the one outlined above) and that it looks like it can be easily converted like:

  Old ROC number (as per Certificate of Registration)	New ROCBN Number (8 Digit)	Type of Company
  P/12,341/2011	P00012341	Proprietorship
  RC/567/2012	RC00000567	Registered Companies
  AGO/RFC/890	RFC00000890	Foreign Registered Companies

  • Also found in http://www.business.gov.bn/Shared%20Documents/BR%20Guideline%20and%20related%20docs/Business%20Reporting%20Briefing%20Pack%20for%202018%20(220218).pdf
  • And in https://business.mofe.gov.bn/Shared%20Documents/BR%20Guideline%20and%20related%20docs/Business%20Reporting%20(BR)%20Briefing%20Pack%20(051218).pdf
  • And similar suggestion in http://labour.gov.bn/SiteAssets/SitePages/Services%20-%20Statistics/BR%20Factsheet_7June2017.pdf
• It doesn't seem to exist a proper name. I have found "ROC", "ROCBN", "RC/RFC", "Sdn Bhd Registration No", "Registration No", "Reg No", etc
• https://tin-check.com/en/brunei-darussalam/
• Online search: https://www.ocp.mofe.gov.bn/
• https://www.mofe.gov.bn/Divisions/Automatic-Exchange-of-Information.aspx
• https://www.ocp.mofe.gov.bn/resources/GettingStarted
• https://www.sgbt.lu/fileadmin/user_upload/SGBT/PDF/Compliance/CRS_2018/20191031_TIN_Leaflet_EN.pdf

Examples:

• https://www.national.com.bn/wp-content/uploads/2021/06/Commercial-Vehicle-Protector.pdf
• RFC0000061 from https://av.sc.com/bn/content/docs/bn-home-updated-tnc-stanchart-visa-extra.pdf
• AGO/RC/3804 from https://www.energy.gov.bn/Shared%20Documents/LBD/Companies/Armada%20Jaya%20Sdn%20Bhd%20Profile.pdf
• AGO/RFC/488 from https://corporate.bn.totalenergies.com/legal--en-us-18
• RFC/00000772 from https://www.baiduri.com.bn/clients/Baiduri_Bank_02_DB46FAE5-2CE9-4217-B0E0-B472FC448BAF/uploads/fs_lgjgf_en_20220930_s522rytbw.pdf
• AGO/RC/1543 from http://readymix.com.bn/about%20us/about_corporate.php
• RC/6953/2007 from https://www.initial.com/bn/business-sectors/hotels-hospitality
• RC/00006326 from https://www.aegis.com.bn/sec-data-solutions/sds-contact/
• AGO/RC/6803/06 from http://www.armada.com.bn/wp-content/uploads/2022/08/Armada-JOB-ADVERT_August-2022_Armada-Website-1.pdf
• RC00004866 from https://www.esuria.com.bn:4343/contact/index.html
• RC00006420 from http://www.bibd.com.bn/assets/images/personal/promotions/2022/Samima_TCs_SD_LCSD.pdf
• RC/00009742 from https://www.baiduri.com.bn/clients/Baiduri_Bank_02_DB46FAE5-2CE9-4217-B0E0-B472FC448BAF/contentms/img/Baiduri%20Capital/pdf/Customer-Care-Guide-on-the-Baiduri-Capital-Trading-Platform_FINAL.pdf
• P20008207 from https://sme.com.bn/shop/6tb-western-digital-wd-red-plus-3-5-sata-int-hdd-98#attr=
• AGO/RC/3275 from https://www.baiduri.com.bn/clients/Baiduri_Bank_02_DB46FAE5-2CE9-4217-B0E0-B472FC448BAF/contentms/img/download-centre/application-form/Baiduri-Corporate-ATM-Card-Application-Form.pdf
• P00084071 (in the certificate it shows up as P/84071/2010) from https://website.com.bn/about/
• P20006927 from https://zh-cn.facebook.com/Flowerinaboxbrunei/photos/masya-allah-alhamdulillahatlast-whatever-that-has-given-we-are-thankful-first-of/357922694641514/
• AGO/RC/4106 from https://www.pahaytc.com/wp-content/uploads/2020/12/Certificate-of-Incorporation-of-Private-Company.jpg