---
title: "Sender ID registration in Spain"
description: "Register an SMS sender ID in Spain: CNMC + AEPD rules, up to 1 month lead time, opt-out wording, alphanumeric formats and rejection reasons. We file it for you."
canonical: "https://omnichannels.ai/sender-id/spain/"
language: "en"
updated: "2026-10-01"
publisher: "BroadNet Technologies"
brand: "OmniChannels.ai"
---

# Sender ID registration in Spain

Canonical: https://omnichannels.ai/sender-id/spain/
Language: en
Publisher: OmniChannels.ai by BroadNet Technologies

**Short answer:** Yes. Sender ID registration is required in Spain (CNMC alias registry (Registro de Alias), mandatory since 15 September 2026). Approval typically takes up to 1 month (CNMC alias registry). Alphanumeric IDs of up to 11 characters are accepted. OmniChannels.ai handles the filing across 4 operators and confirms current rules during onboarding.

## Sender ID rules at a glance

| Item | Details |
|---|---|
| Regulator | Comisión Nacional de los Mercados y la Competencia + Agencia Española de Protección de Datos (CNMC + AEPD) |
| Registration required | Required (CNMC alias registry (Registro de Alias), mandatory since 15 September 2026) |
| Typical lead time | Up to 1 month (CNMC alias registry) |
| Alphanumeric sender ID | Yes (Latin letters, up to 11 characters) |
| Numeric long code / short code | Not listed for this market; alphanumeric is the documented format |
| Accepted formats | Alphanumeric alias (CNMC format rules) |
| Promotional sending hours | No regulator-published window found (Agree sending hours with the operator and schedule promotional sends for the recipient's local daytime; transactional traffic runs 24/7.) |
| Opt-in | GDPR-compliant opt-in required. Double opt-in is the operator-preferred standard for marketing. |
| Opt-out | STOP keyword honoured network-wide. Opt-out is one-step and irreversible until the recipient re-consents. |
| Operators we reach | Movistar, Vodafone Spain, Orange Spain and MásMóvil |
| Last reviewed | 1 October 2026 (Sources: CNMC, AEPD, CNMC Registro de Alias, CNMC alias guide) |

Official sources: [CNMC](https://www.cnmc.es/), [AEPD](https://www.aepd.es/), [CNMC Registro de Alias](https://www.cnmc.es/sectores-que-regulamos/telecomunicaciones/registro-alias), [CNMC alias guide](https://www.cnmc.es/sites/default/files/editor_contenidos/Telecomunicaciones/Registro%20alias_DUV_.pdf)

## How to register your sender ID in Spain through OmniChannels.ai

1. **Choose and check your sender ID:** Pick a sender ID that matches your brand: Latin letters, up to 11 characters. Test it in the free sender ID checker first.
2. **Send us your company details and use case:** Tell us the legal entity, brand and what each sender ID will send (OTP, transactional or promotional). We confirm which supporting documents are currently needed.
3. **We file with CNMC + AEPD and the operators:** We prepare and submit the application. Current process in Spain: CNMC alias registry (Registro de Alias), mandatory since 15 September 2026.
4. **Approval and test messages:** Approval typically takes up to 1 month (CNMC alias registry). Once approved we send test messages on Movistar, Vodafone Spain, Orange Spain and MásMóvil and check the sender ID displays correctly.
5. **Go live:** Send through the REST API, SMPP or campaigns. Schedule promotional sends for the recipient's local daytime. Opt-out handling is applied to every promotional message.

## Common reasons a sender ID is rejected in Spain

- Too long: sender IDs here are up to 11 characters.
- Generic words instead of a brand, such as INFO, SMS, OTP, ALERT: regulators usually refuse them.
- Arabic, accented or other non-Latin letters: this market lists Latin letters only.
- Spaces or symbols such as _ & ! ( ): many operators strip or refuse them; use a hyphen or nothing.

## Sender ID in Spain: questions

### Do I need to register a sender ID in Spain?

Yes. CNMC alias registry (Registro de Alias), mandatory since 15 September 2026. We submit it for you and confirm the current requirements during onboarding.

### How long does sender ID registration take in Spain?

Typically up to 1 month (CNMC alias registry), depending on the registry and the documents provided. We confirm the current timeline for your sender ID during onboarding.

### Can I use an alphanumeric sender ID in Spain?

Yes. Alphanumeric sender IDs are accepted: Latin letters, up to 11 characters. Accepted formats: Alphanumeric alias (CNMC format rules).

### When can I send promotional SMS in Spain?

There is no regulator-published window that we know of in Spain. Agree sending hours with the operator and schedule promotional sends for the recipient's local daytime; transactional traffic runs 24/7.

### What consent and opt-out rules apply in Spain?

GDPR-compliant opt-in required. Double opt-in is the operator-preferred standard for marketing. STOP keyword honoured network-wide. Opt-out is one-step and irreversible until the recipient re-consents.

### Who regulates SMS sender IDs in Spain?

Comisión Nacional de los Mercados y la Competencia + Agencia Española de Protección de Datos (CNMC + AEPD), together with the mobile operators (Movistar, Vodafone Spain, Orange Spain and MásMóvil). Official sources: CNMC, AEPD, CNMC Registro de Alias, CNMC alias guide.

## Related

- [Sender ID checker for Spain](https://omnichannels.ai/tools/sender-id-checker/?country=ES)
- [SMS pricing in Spain](https://omnichannels.ai/sms-pricing/spain/)
- [Register your sender ID](https://omnichannels.ai/contact/)

Last reviewed 2026-10-01. Rules are confirmed during onboarding.