Spain: SMS Guidelines
MCC: 214
Dial Code: 34
Spain's telecoms regulator, the CNMC, is rolling out a new Alias Registry as part of Circular 1/2026. Starting June 7, 2026, any alphanumeric Sender ID — that's the brand name people see instead of a phone number when they receive an SMS — must be registered before it can be used to send messages to Spanish numbers (+34).
Information on Alphanumeric Sender ID registration:
Please provide the details below to alpha_sender_id@telnyx.com:
Your company details
— Full legal company name
— Your NIF/CIF (Spanish tax ID for companies) or EU-VAT number if you're based outside Spain
— Registered company address
Legal representative
— Full name
— NIF or passport number
— Mobile number and email address
Sender ID details (one set per alias)
— The exact alias as it appears in your messages (e.g. MYBRAND)
— What you use it for (transactional, OTP, marketing, etc.)
— Planned start and end date — note that registrations are valid for a maximum of 24 months
Proof of ownership — one of the following per alias:
— Trademark or trade name → certificate from OEPM (Spain) or EUIPO (EU)
— Company name → certificate from the Spanish Mercantile Registry
— Domain name → proof of ownership of a .es or ICANN-registered domain that matches the alias
Please make sure to always refer to our Acceptable Use Policy for Messaging.