Numbers with prefix 921 in Spain

Operators with numbering in prefix 921

According to the CNMC numbering register, the numbering of prefix 921 is split between 44 operators (624,000 of 1,000,000 numbers assigned).

• Movistar28 blocks · 280,000 numbers · 28% of the prefix
• Vodafone6 blocks · 60,000 numbers · 6% of the prefix
• Orange4 blocks · 40,000 numbers · 4% of the prefix
• Aire Networks Del Mediterráneo2 blocks · 20,000 numbers · 2% of the prefix
• Xtra Telecom2 blocks · 20,000 numbers · 2% of the prefix
• Alai Operador De Telecomunicaciones1 block · 10,000 numbers · 1% of the prefix
• Bt Global Ict Business Spain1 block · 10,000 numbers · 1% of the prefix
• Colt Technology Services1 block · 10,000 numbers · 1% of the prefix
• Dialoga Servicios Interactivos1 block · 10,000 numbers · 1% of the prefix
• Digi1 block · 10,000 numbers · 1% of the prefix
• Duocom Europe1 block · 10,000 numbers · 1% of the prefix
• Euskaltel1 block · 10,000 numbers · 1% of the prefix
• and 32 more operators

Because of number portability, a given number may have moved to another operator after the assignment. Source: Comisión Nacional de los Mercados y la Competencia (CNMC)

Prefix 921 activity on NoCall

Between 27 Oct 2026 and 6 Nov 2026 (11 measured days), 294 distinct numbers with this prefix were looked up. Adding up, day by day, the distinct IPs that looked one up gives 54 lookups.

Each bar is the number of distinct IPs that searched NoCall (web or app) for any number with this prefix that day (UTC days); an IP counts once a day however many numbers it looks up, and it may be a bot. Days without a complete measurement are left empty. Reports are only those sent by NoCall users and approved after review (no imported data or comments), counted per distinct user, and are shown from 3 users. A lookup does not mean the number is a scam. Updated on 7 Nov 2026