● HamNet International

VoIP Number Generator v2

Full call sign encoding — international prefix support

▶ Result

Breakdown (letter → key · position)
🌍 International
Dial from any country
📍 Local
Use when you have the same prefix — suffix only

■ Encoding Rules

Call Sign Format

  • Must not start with 0 or 1 (ITU rule)
  • Prefix: 1–3 alphanumeric chars — the last digit is the district digit
  • Suffix: 1–6 uppercase letters (A–Z only), after the district digit
  • Examples: OE2XKD, 9A2EDA, 4X6TT, F5XO, W6RJ

Encoding — Letters

Each letter produces two digits:

  • Digit 1 — key number the letter sits on
  • Digit 2 — 1-indexed position on that key

Example: O=63, E=32, A=21

Encoding — Digits in Prefix

  • Every digit in the prefix is multiplied by 10
  • This applies to the district digit and any digit earlier in the prefix

Example: 9A2 → 90 21 20
(9×10=90, A=21, 2×10=20)

Full Number Structure

  • 00 — fixed international prefix
  • Encoded prefix chars + district digit×10 — prefix group
  • Encoded suffix letters — suffix group

OE2XKD → 00 633220 925231
9A2EDA → 00 902120 323221

■ Keypad Reference