Apparatus

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sensors Mode-S transponder

49D423

ICAO 24-bit transponder address · allocated to Czech Republic

Currently assigned to OK-SWM · BOEING 737 MAX 8

Hex
49D423
Octal
22352043
Decimal
4,838,435
Country
CZ
Tail
OK-SWM
Type
B38M
No current signal · last broadcast Jul 26, 18:00 UTC
Flights observed
415
Distinct callsigns
20
Country
CZ
Last broadcast
Jul 26, 18:00 UTC

Last known position

Most recent position reported by Mode-S 49D423.

Country allocation

The ICAO 24-bit address 49D423 falls within the block assigned to Czech Republic (CZ) by ICAO Annex 10, Volume III. Every aircraft registered in Czech Republic 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
TVS9EK - 14 2026-07-19
TVS6P7 Smart Wings 10 2026-06-01
TVS6N7 Smart Wings 10 2026-06-01
TVS9E5 - 9 2026-07-19
TVS8KQ - 6 2026-06-15
TVS7KQ Smart Wings 5 2026-06-01
TVS44T Smart Wings 5 2026-04-24
TVS22H - 5 2026-06-19
TVS4PN Smart Wings 4 2026-05-26
TVS49A Smart Wings 4 2026-05-26
TVS26M Smart Wings 4 2026-05-05
TVS23K Smart Wings 4 2026-06-21
TVS92M - 3 2026-07-11
TVS91M - 3 2026-07-11
TVS8FA Smart Wings 3 2026-06-19
TVS6PS - 3 2026-07-15
TVS5PS - 3 2026-07-15
TVS5FA Smart Wings 3 2026-06-19
TVS53B Smart Wings 3 2026-06-13
TVS52A - 3 2026-06-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 TVQ6085 HRG → BTS Jul 26, 09:05 UTCJul 26, 17:55 UTC8h 50m
2026-07-25 TVQ6087 HRG → KSC Jul 25, 23:40 UTCJul 26, 07:55 UTC8h 16m
2026-07-25 TVS9A1 PMI → BTS Jul 25, 20:25 UTCJul 25, 22:20 UTC1h 55m
2026-07-25 TVS9AG BTS → PMI Jul 25, 16:35 UTCJul 25, 18:55 UTC2h 20m
2026-07-25 TVS67M HER → BTS Jul 25, 12:35 UTCJul 25, 14:50 UTC2h 15m
2026-07-25 TVS2H7 KSC → HER Jul 25, 09:00 UTCJul 25, 10:45 UTC1h 45m
2026-07-25 TVS2H8 - Jul 25, 05:30 UTCJul 25, 07:35 UTC2h 5m
2026-07-25 TVS67L BTS → HER Jul 25, 02:20 UTCJul 25, 04:05 UTC1h 45m
2026-07-24 TVQ6303 KGS → BTS Jul 24, 20:25 UTCJul 24, 22:35 UTC2h 10m
2026-07-24 TVQ6302 BTS → KGS Jul 24, 17:05 UTCJul 24, 19:00 UTC1h 55m
2026-07-24 TVS9B2 BOJ → BTS Jul 24, 12:10 UTCJul 24, 13:40 UTC1h 30m
2026-07-24 TVS9FL KSC → BOJ Jul 24, 08:45 UTCJul 24, 09:55 UTC1h 10m
2026-07-24 TVS9F6 BOJ → KSC Jul 24, 06:10 UTCJul 24, 07:30 UTC1h 20m
2026-07-24 TVS9BH BTS → BOJ Jul 24, 03:40 UTCJul 24, 05:00 UTC1h 20m
2026-07-23 TVQ6002 - Jul 23, 09:55 UTCJul 23, 18:35 UTC8h 40m
2026-07-23 TVQ6090 BTS → HRG Jul 23, 00:15 UTCJul 23, 08:50 UTC8h 35m
2026-07-22 TVQ6165 AYT → BTS Jul 22, 20:30 UTCJul 22, 22:50 UTC2h 20m
2026-07-22 TVQ6166 KSC → AYT Jul 22, 16:55 UTCJul 22, 19:05 UTC2h 10m
2026-07-22 TVQ6167 AYT → KSC Jul 22, 13:35 UTCJul 22, 15:45 UTC2h 10m
2026-07-22 TVQ6130 - Jul 22, 10:20 UTCJul 22, 12:10 UTC1h 50m
2026-07-22 TVQ6164 BTS → AYT Jul 22, 02:35 UTCJul 22, 05:05 UTC2h 30m
2026-07-21 TVQ6461 MIR → BTS Jul 21, 17:55 UTCJul 21, 19:40 UTC1h 45m
2026-07-21 TVQ6462 KSC → MIR Jul 21, 14:10 UTCJul 21, 16:20 UTC2h 10m
2026-07-21 TVQ6463 MIR → KSC Jul 21, 10:50 UTCJul 21, 12:40 UTC1h 50m
2026-07-21 TVQ6476 TAT → MIR Jul 21, 07:05 UTCJul 21, 09:05 UTC2h 0m
2026-07-21 TVQ6477 MIR → TAT Jul 21, 03:50 UTCJul 21, 05:45 UTC1h 55m
2026-07-21 TVQ6460 BTS → MIR Jul 21, 00:30 UTCJul 21, 02:30 UTC2h 0m
2026-07-20 TVQ6648 BTS → BVC Jul 20, 07:55 UTCJul 20, 23:20 UTC15h 25m
2026-07-20 TVS660P BTS → PRG Jul 20, 05:50 UTCJul 20, 06:30 UTC40m
2026-07-19 TVS9E5 - Jul 19, 18:20 UTCJul 19, 20:50 UTC2h 30m
2026-07-19 TVS9EK - Jul 19, 11:05 UTCJul 19, 13:45 UTC2h 40m
2026-07-19 TVS2KL CHQ → PRG Jul 19, 06:55 UTCJul 19, 09:20 UTC2h 25m
2026-07-19 TVS1KL PRG → CHQ Jul 19, 03:25 UTCJul 19, 05:45 UTC2h 20m
2026-07-18 TVS2YZ RHO → PRG Jul 18, 21:25 UTCJul 19, 00:00 UTC2h 35m
2026-07-18 TVL5004 BUD → RHO Jul 18, 17:45 UTCJul 18, 19:40 UTC1h 55m
2026-07-18 TVL5301 AYT → BUD Jul 18, 13:55 UTCJul 18, 16:05 UTC2h 10m
2026-07-18 TVL5396 DEB → AYT Jul 18, 10:20 UTCJul 18, 12:20 UTC2h 0m
2026-07-18 TVL5397 AYT → DEB Jul 18, 06:50 UTCJul 18, 08:50 UTC2h 0m
2026-07-18 TVL5300 BUD → AYT Jul 18, 03:30 UTCJul 18, 05:40 UTC2h 10m
2026-07-17 TVL5041 - Jul 17, 21:30 UTCJul 17, 22:40 UTC1h 10m
2026-07-17 TVL5040 - Jul 17, 18:40 UTCJul 17, 19:40 UTC1h 0m
2026-07-17 TVL5367 AYT → BUD Jul 17, 14:50 UTCJul 17, 17:05 UTC2h 15m
2026-07-17 TVL5366 BUD → AYT Jul 17, 11:35 UTCJul 17, 13:40 UTC2h 5m
2026-07-17 TVL5165 LEI → BUD Jul 17, 07:30 UTCJul 17, 10:15 UTC2h 45m
2026-07-17 TVL5164 BUD → LEI Jul 17, 03:14 UTCJul 17, 06:25 UTC3h 10m
2026-07-16 TVL5021 - Jul 16, 14:25 UTCJul 16, 16:25 UTC2h 0m
2026-07-16 TVL5046 - Jul 16, 11:10 UTCJul 16, 12:49 UTC1h 40m
2026-07-16 TVL5047 - Jul 16, 07:15 UTCJul 16, 09:00 UTC1h 45m
2026-07-16 TVS31R - Jul 16, 03:05 UTCJul 16, 05:25 UTC2h 20m
2026-07-15 TVS2645 - Jul 15, 22:40 UTCJul 16, 01:40 UTC3h 0m

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 OK-SWM page for operator, model, and routing details .

Mode-S 49D423 frequently asked

What is Mode-S code 49D423?
49D423 is an ICAO 24-bit transponder address. Allocated to Czech Republic. Assigned to OK-SWM.
Where is Mode-S 49D423 registered?
Mode-S code 49D423 is allocated to Czech Republic (CZ). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 49D423 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 18:00 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 49D423, octal 22352043, decimal 4,838,435.
What flights does 49D423 operate?
Mode-S 49D423 has broadcast 20 distinct callsigns, including TVS9EK, TVS6P7, TVS6N7, TVS9E5, TVS8KQ.