+421

Countries and territories

• Slovakia

NoCall activity for +421

NoCall's own data on numbers starting with +421, across all editions.

Lookups in the last 30 days

4,273

Distinct numbers looked up (30 days)

1,790

Verified numbers on the block list

21

Each number counts at most one lookup per day per device or IP. Comments and reports imported from other sites are not included. A lookup does not mean a number is fraudulent.

Updated November 8, 2026

Official source and review

International Telecommunication Union · Document: 2026-08-09 · Reviewed: 2026-08-09

A calling code identifies a numbering area or global service. It does not identify the caller, and caller ID can be spoofed.