Contact your local pigeon association or club: They usually have a database of pigeon anklet numbers, which can help you check the pigeon owners.
Online inquiry: pigeon associations or clubs in some countries and regions may provide online inquiry services. You can enter the anklet number in their official website for inquiry.
Consult a professional veterinarian or pet store: They may have some communication with pigeon lovers and can give you some clues.
Social media help: You can post help information on relevant social media platforms, and there may be enthusiastic pigeon lovers to help you inquire about pigeon breeders.
Ask nearby pigeon farmers: If there are many pigeon farmers in your area, you can ask them if anyone has lost a pigeon with a specific anklet number.