Maintenance window from 6pm to 12pm (CEST) on 5 October 2022: During this time, there may be restrictions or interruptions to the portal services.

Search for an Issuer Identifier Number (IIN)

Service description

Search for allocated or available Issuer Identifier Numbers (IINs).

There are four ways to search for IINs:

  1. Search for all IINs
  2. Search by holder: Search for IINs allocated to the selected holder
  3. Search by number range: Search for IINs within a specific number range
  4. Search for a specific IIN

Do you have any questions or comments about the 'Search for an Issuer Identifier Number (IIN)' service? 

Contact us using the service Contact for questions about telecom services.  

Support - Contact

Federal Office of Communications
TP-NA
Zukunftstrasse 44
Postfach 256
CH-2501 Biel/Bienne

Tel.: +41 58 460 56 40
Email: numbering@bakom.admin.ch
Contact form