sensors Mode-S transponder

48C12B

ICAO 24-bit transponder address · allocated to Poland

Currently assigned to SP-RKL · BOEING 737-800

Hex
48C12B
Octal
22140453
Decimal
4,768,043
Country
PL
Tail
SP-RKL
Type
B738
No current signal · last broadcast 12h ago
Flights observed
20
Distinct callsigns
12
Country
PL
Last broadcast
12h ago

Last known position

Most recent position reported by Mode-S 48C12B.

Country allocation

The ICAO 24-bit address 48C12B falls within the block assigned to Poland (PL) by ICAO Annex 10, Volume III. Every aircraft registered in Poland receives a permanent address from this block at the time of registration; the address stays with the airframe even if the aircraft is re-registered to a different operator within the country.

Callsign history 12 distinct

Callsign Airline Flights Last seen
RYR61CH - 3 2026-04-14
RYR46CZ - 3 2026-04-13
RYR290W - 3 2026-04-14
RYR7838 - 2 2026-04-13
RYR5DZ - 2 2026-04-13
RYR7QU - 1 2026-04-13
RYR7839 - 1 2026-04-13
RYR76CE - 1 2026-04-14
RYR6PA - 1 2026-04-13
RYR6EX - 1 2026-04-12
RYR3VN Ryanair 1 2026-04-12
RYR1UN Ryanair 1 2026-04-13

Recent flights last 20

DateFlightRouteTakeoffLandingDuration
2026-04-14 RYR290W - Apr 14, 10:35 UTCApr 14, 11:05 UTC30m
2026-04-14 RYR61CH - Apr 14, 09:10 UTCApr 14, 09:20 UTC10m
2026-04-14 RYR61CH - Apr 14, 07:10 UTCApr 14, 09:05 UTC1h 55m
2026-04-14 RYR61CH - Apr 14, 06:50 UTCApr 14, 07:10 UTC20m
2026-04-14 RYR76CE - Apr 14, 05:15 UTCApr 14, 05:50 UTC35m
2026-04-13 RYR1UN BCN → STN Apr 13, 19:00 UTCApr 13, 19:35 UTC35m
2026-04-13 RYR7839 - Apr 13, 16:50 UTCApr 13, 18:00 UTC1h 10m
2026-04-13 RYR7838 - Apr 13, 15:50 UTCApr 13, 16:10 UTC20m
2026-04-13 RYR7838 - Apr 13, 15:00 UTCApr 13, 16:10 UTC1h 10m
2026-04-13 RYR290W - Apr 13, 12:20 UTCApr 13, 12:40 UTC20m
2026-04-13 RYR290W - Apr 13, 12:10 UTCApr 13, 12:40 UTC30m
2026-04-13 RYR6PA - Apr 13, 09:50 UTCApr 13, 11:05 UTC1h 15m
2026-04-13 RYR46CZ - Apr 13, 08:20 UTCApr 13, 08:55 UTC35m
2026-04-13 RYR46CZ - Apr 13, 07:55 UTCApr 13, 08:55 UTC1h 0m
2026-04-13 RYR46CZ - Apr 13, 07:25 UTCApr 13, 08:15 UTC50m
2026-04-13 RYR7QU - Apr 13, 05:15 UTCApr 13, 06:25 UTC1h 10m
2026-04-13 RYR5DZ - Apr 13, 03:55 UTCApr 13, 04:20 UTC25m
2026-04-13 RYR5DZ - Apr 13, 02:55 UTCApr 13, 04:15 UTC1h 20m
2026-04-12 RYR3VN BLQ → PMO Apr 12, 19:40 UTCApr 12, 20:15 UTC35m
2026-04-12 RYR6EX - Apr 12, 17:15 UTCApr 12, 18:35 UTC1h 20m

About Mode-S

A Mode-S transponder code (also called an "ICAO 24-bit address" or "hex code") is a 6-character hexadecimal identifier permanently assigned to an aircraft when it's first registered. Unlike callsigns (which change with each flight) or registrations (which can change if an aircraft is sold internationally), the Mode-S address stays with the airframe for the life of the aircraft in that country.

Every ADS-B transmission from an aircraft includes its Mode-S address, making it the most reliable way to identify a specific airframe. Flight-tracking services like Apparatus use the Mode-S address as the primary key for tying position broadcasts, callsigns, and ownership records together.

Prefer a tail-number view? See the SP-RKL page for operator, model, and routing details .

Mode-S 48C12B frequently asked

What is Mode-S code 48C12B?
48C12B is an ICAO 24-bit transponder address. Allocated to Poland. Assigned to SP-RKL.
Where is Mode-S 48C12B registered?
Mode-S code 48C12B is allocated to Poland (PL). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 48C12B broadcasting right now?
No active broadcast right now. Last signal was 12h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 48C12B, octal 22140453, decimal 4,768,043.
What flights does 48C12B operate?
Mode-S 48C12B has broadcast 12 distinct callsigns, including RYR61CH, RYR46CZ, RYR290W, RYR7838, RYR5DZ.