Numbers with prefix 851 in Spain

Operators with numbering in prefix 851

According to the CNMC numbering register, the numbering of prefix 851 is split between 24 operators (95,000 of 1,000,000 numbers assigned).

• Avatel Móvil1 block · 10,000 numbers · 1% of the prefix
• Belgacom International Carrier Services1 block · 10,000 numbers · 1% of the prefix
• Bt Global Ict Business Spain1 block · 10,000 numbers · 1% of the prefix
• Comunistone1 block · 10,000 numbers · 1% of the prefix
• Euskaltel1 block · 10,000 numbers · 1% of the prefix
• Manifone Iberia1 block · 10,000 numbers · 1% of the prefix
• Orange1 block · 10,000 numbers · 1% of the prefix
• Citelia4 blocks · 4,000 numbers · 0.4% of the prefix
• Alhambra Systems3 blocks · 3,000 numbers · 0.3% of the prefix
• Iovox2 blocks · 2,000 numbers · 0.2% of the prefix
• Peopletel2 blocks · 2,000 numbers · 0.2% of the prefix
• Voxbone2 blocks · 2,000 numbers · 0.2% of the prefix
• and 12 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 851 activity on NoCall

Between 27 Oct 2026 and 6 Nov 2026 (11 measured days), 315 distinct numbers with this prefix were looked up. Adding up, day by day, the distinct IPs that looked one up gives 55 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