Apparatus

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sensors Mode-S transponder

48C123

ICAO 24-bit transponder address · allocated to Poland

Currently assigned to SP-RKD · BOEING 737-800

Hex
48C123
Octal
22140443
Decimal
4,768,035
Country
PL
Tail
SP-RKD
Type
B738
No current signal · last broadcast Jul 26, 22:45 UTC
Flights observed
681
Distinct callsigns
20
Country
PL
Last broadcast
Jul 26, 22:45 UTC

Last known position

Most recent position reported by Mode-S 48C123.

Country allocation

The ICAO 24-bit address 48C123 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 20 distinct

Callsign Airline Flights Last seen
RYR94CD - 10 2026-07-06
RYR5BK - 10 2026-07-06
RYR9KY - 9 2026-07-07
RYR84TV Ryanair 9 2026-07-26
RYR45BN - 9 2026-07-07
RYR2UP Ryanair 9 2026-07-26
RYR9906 Ryanair 8 2026-07-25
RYR829J Ryanair 8 2026-07-25
RYR80WD - 8 2026-07-06
RYR115D - 8 2026-07-06
RYR48BQ - 7 2026-07-05
RYR41FB Ryanair 7 2026-07-26
RYR3CL - 7 2026-07-05
RYR85VG Ryanair 6 2026-07-26
RYR667X Ryanair 6 2026-06-14
RYR466H Ryanair 6 2026-05-14
RYR3JZ - 6 2026-07-11
RYR2FY Ryanair 6 2026-05-16
RYR8557 Ryanair 5 2026-07-26
RYR83FD - 5 2026-07-15

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 RYR49EJ PSA → TIA Jul 26, 22:05 UTCJul 26, 22:45 UTC40m
2026-07-26 RYR58HM - Jul 26, 20:00 UTCJul 26, 21:10 UTC1h 10m
2026-07-26 RYR85VG STN → KRK Jul 26, 18:00 UTCJul 26, 18:25 UTC25m
2026-07-26 RYR41FB TIA → PSR Jul 26, 15:40 UTCJul 26, 16:25 UTC45m
2026-07-26 RYR813T - Jul 26, 12:50 UTCJul 26, 13:15 UTC25m
2026-07-26 RYR8557 TIA → BRI Jul 26, 11:15 UTCJul 26, 11:35 UTC20m
2026-07-26 RYR84TV FKB → TIA Jul 26, 08:30 UTCJul 26, 10:00 UTC1h 30m
2026-07-26 RYR2UP SNN → ALC Jul 26, 05:35 UTCJul 26, 07:25 UTC1h 51m
2026-07-25 RYR8667 - Jul 25, 21:50 UTCJul 25, 22:35 UTC45m
2026-07-25 RYR623Z TIA → CTA Jul 25, 20:00 UTCJul 25, 20:50 UTC50m
2026-07-25 RYR8PL BER → LIS Jul 25, 17:40 UTCJul 25, 18:55 UTC1h 15m
2026-07-25 RYR53QC TIA → TRN Jul 25, 15:15 UTCJul 25, 16:40 UTC1h 25m
2026-07-25 RYR9906 MST → BCN Jul 25, 12:20 UTCJul 25, 13:30 UTC1h 10m
2026-07-25 RYR829J TIA → FMM Jul 25, 07:25 UTCJul 25, 11:25 UTC4h 0m
2026-07-25 RYR4XY MAN → MXP Jul 25, 05:05 UTCJul 25, 06:25 UTC1h 20m
2026-07-24 RYR79WD BGY → TIA Jul 24, 21:40 UTCJul 24, 22:40 UTC1h 0m
2026-07-24 RYR13HB TIA → BGY Jul 24, 19:25 UTCJul 24, 20:50 UTC1h 25m
2026-07-24 RYR6809 WAW → TIA Jul 24, 16:50 UTCJul 24, 18:05 UTC1h 15m
2026-07-24 RYR52YH - Jul 24, 14:30 UTCJul 24, 16:05 UTC1h 35m
2026-07-24 RYR15BA - Jul 24, 12:00 UTCJul 24, 13:00 UTC1h 0m
2026-07-24 RYR4AM NRN → PMO Jul 24, 09:50 UTCJul 24, 11:00 UTC1h 10m
2026-07-24 RYR6453 VRN → LUX Jul 24, 07:15 UTCJul 24, 08:25 UTC1h 10m
2026-07-24 RYR7DG BGY → STN Jul 24, 05:00 UTCJul 24, 06:20 UTC1h 20m
2026-07-23 RYR9906 - Jul 23, 19:35 UTCJul 23, 20:40 UTC1h 5m
2026-07-23 RYR829J TIA → FMM Jul 23, 17:20 UTCJul 23, 18:45 UTC1h 25m
2026-07-23 RYR84TV FKB → TIA Jul 23, 14:15 UTCJul 23, 15:35 UTC1h 20m
2026-07-23 RYR2UP SNN → ALC Jul 23, 11:45 UTCJul 23, 13:30 UTC1h 45m
2026-07-23 RYR8332 - Jul 23, 07:50 UTCJul 23, 09:35 UTC1h 45m
2026-07-23 RYR1PM DUB → BRI Jul 23, 04:55 UTCJul 23, 06:55 UTC2h 0m
2026-07-22 RYR16NJ - Jul 22, 20:40 UTCJul 22, 21:45 UTC1h 5m
2026-07-22 RYR13GV - Jul 22, 18:10 UTCJul 22, 19:45 UTC1h 35m
2026-07-22 RYR8PL BER → LIS Jul 22, 15:20 UTCJul 22, 16:30 UTC1h 10m
2026-07-22 RYR53QC TIA → TRN Jul 22, 13:05 UTCJul 22, 14:40 UTC1h 35m
2026-07-22 RYR8414 - Jul 22, 11:10 UTCJul 22, 11:30 UTC20m
2026-07-22 RYR41FB TIA → PSR Jul 22, 03:50 UTCJul 22, 04:45 UTC55m
2026-07-21 RYR7YG LNZ → STN Jul 21, 21:25 UTCJul 21, 22:45 UTC1h 20m
2026-07-21 RYR6LW STN → OTP Jul 21, 18:50 UTCJul 21, 20:25 UTC1h 35m
2026-07-21 RYR76JH NAP → TIA Jul 21, 16:45 UTCJul 21, 17:20 UTC35m
2026-07-21 RYR79SY - Jul 21, 14:40 UTCJul 21, 15:25 UTC45m
2026-07-21 RYR79WD BGY → TIA Jul 21, 12:20 UTCJul 21, 13:20 UTC1h 0m
2026-07-21 RYR13HB TIA → BGY Jul 21, 09:10 UTCJul 21, 10:35 UTC1h 25m
2026-07-21 RYR6UD PSA → TIA Jul 21, 06:45 UTCJul 21, 07:35 UTC50m
2026-07-21 RYR49RQ TIA → PSA Jul 21, 04:15 UTCJul 21, 05:30 UTC1h 15m
2026-07-20 RYR11LM SUF → TIA Jul 20, 21:00 UTCJul 20, 21:30 UTC30m
2026-07-20 RYR7091 DTM → STN Jul 20, 19:30 UTCJul 20, 20:05 UTC35m
2026-07-20 RYR6453 VRN → LUX Jul 20, 16:05 UTCJul 20, 17:15 UTC1h 10m
2026-07-20 RYR7DG BGY → STN Jul 20, 13:35 UTCJul 20, 15:00 UTC1h 25m
2026-07-20 RYR6UD - Jul 20, 10:40 UTCJul 20, 11:40 UTC1h 0m
2026-07-20 RYR49RQ - Jul 20, 08:05 UTCJul 20, 09:15 UTC1h 10m
2026-07-20 RYR6ZT STN → BLQ Jul 20, 05:35 UTCJul 20, 06:25 UTC50m

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-RKD page for operator, model, and routing details .

Mode-S 48C123 frequently asked

What is Mode-S code 48C123?
48C123 is an ICAO 24-bit transponder address. Allocated to Poland. Assigned to SP-RKD.
Where is Mode-S 48C123 registered?
Mode-S code 48C123 is allocated to Poland (PL). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 48C123 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:45 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 48C123, octal 22140443, decimal 4,768,035.
What flights does 48C123 operate?
Mode-S 48C123 has broadcast 20 distinct callsigns, including RYR94CD, RYR5BK, RYR9KY, RYR84TV, RYR45BN.