International Call Sign Prefixes & DMR Country Codes (MCC) — Cross-Reference

Search by country, by call sign prefix (e.g. J4), or by MCC (e.g. 208) — all in one box.

No MCC issued = country has call sign prefixes but no DMR country code.

MCC = Mobile Country Code, a three-digit ITU code (Rec. E.212) that identifies a country’s mobile networks. Amateur radio reuses it for DMR: every DMR radio ID starts with the issuing country’s MCC — 310 for the U.S., 234/235 for the U.K., 208 for France. “No MCC issued” means the territory has call sign prefixes but no MCC of its own.

2026 Count = registered DMR operator IDs from radioid.net, extracted June 2026.

Prefixes the ITU Does Not Issue

A few call sign prefixes will never turn up against a country above, because the ITU either holds them in reserve or bars them outright. They fall into two groups.

Unallocated — held in reserve for future use

These series aren't assigned to anyone yet, but the ITU could allocate them later:

E8,  E9,  H5,  J9,  S4,  T9,  V9,  4N,  Z4,  Z5,  Z7,  Z9,
On → O2, O3, O4, O5, O6, O7, O8, O9
Un → U2, U3, U4, U5, U6, U7, U8, U9
Xn → X2, X3, X4, X5, X6, X7, X8, X9

Unavailable — never issued, by rule

• 1A – 1Z — the entire 1-series is reserved and unallocated (which is why unofficial calls like 1A0 for the Order of Malta and 1S for the Spratlys are heard but not officially recognized).
• QA – QZ — no prefix may begin with Q; it would be confused with the Q-codes.
• Digits 0 and 1 — no prefix uses these numerals, because 0 looks like the letter O and 1 looks like the letter I. (This is exactly why the reserve series above run from 2 to 9, not 1 to 9.)
• Two-digit prefixes (a digit followed by a digit) are not assigned by the ITU.

A noncommercial hobby reference compiled by N6JET, gathered from public sources and shared freely. Amateur radio call sign prefixes, Mobile Country Codes, and 2026 registered DMR ID counts by country / territory. Unissued-prefix data per ITU Appendix 42.