Apparatus

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sensors Mode-S transponder

89905C

ICAO 24-bit transponder address · allocated to Taiwan

Currently assigned to B-50027 · AIRBUS A-321neo

Hex
89905C
Octal
42310134
Decimal
9,015,388
Country
TW
Tail
B-50027
Type
A21N
No current signal · last broadcast 2h ago
Flights observed
303
Distinct callsigns
20
Country
TW
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S 89905C.

Country allocation

The ICAO 24-bit address 89905C falls within the block assigned to Taiwan (TW) by ICAO Annex 10, Volume III. Every aircraft registered in Taiwan 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
TTW281 - 20 2026-07-14
TTW280 - 14 2026-07-14
TTW200 Tigerair Taiwan 13 2026-07-05
TTW585 - 10 2026-06-21
TTW552 - 10 2026-07-14
TTW261 - 10 2026-07-09
TTW201 - 8 2026-06-17
TTW260 - 7 2026-07-08
TTW662 - 6 2026-07-06
TTW285 - 6 2026-06-21
TTW271 - 6 2026-06-28
TTW270 - 6 2026-06-28
TTW263 - 6 2026-07-08
TTW262 - 6 2026-07-08
TTW233 - 6 2026-06-26
TTW210 Tigerair Taiwan 6 2026-06-30
TTW663 - 5 2026-07-06
TTW603 - 5 2026-07-03
TTW602 - 5 2026-07-03
TTW237 - 5 2026-06-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 TTW552 KHH → TPE Jul 14, 10:10 UTCJul 14, 15:35 UTC5h 25m
2026-07-14 TTW281 NRT → KHH Jul 14, 05:45 UTCJul 14, 09:00 UTC3h 15m
2026-07-14 TTW280 KHH → NRT Jul 14, 00:55 UTCJul 14, 04:20 UTC3h 25m
2026-07-13 TTW773 - Jul 13, 10:25 UTCJul 13, 13:45 UTC3h 20m
2026-07-13 TTW772 - Jul 13, 05:35 UTCJul 13, 08:55 UTC3h 20m
2026-07-13 TTW729 - Jul 13, 02:45 UTCJul 13, 03:15 UTC30m
2026-07-12 TTW792 - Jul 12, 23:30 UTCJul 13, 00:40 UTC1h 10m
2026-07-12 TTW670 - Jul 12, 08:25 UTCJul 12, 13:01 UTC4h 35m
2026-07-12 TTW281 NRT → KHH Jul 12, 03:30 UTCJul 12, 06:35 UTC3h 5m
2026-07-10 TTW280 KHH → NRT Jul 10, 00:20 UTCJul 10, 03:35 UTC3h 15m
2026-07-09 TTW261 - Jul 9, 04:15 UTCJul 9, 08:30 UTC4h 15m
2026-07-08 TTW260 KHH → CTS Jul 8, 23:10 UTCJul 9, 03:00 UTC3h 50m
2026-07-08 TTW263 - Jul 8, 08:55 UTCJul 8, 11:30 UTC2h 35m
2026-07-08 TTW262 - Jul 8, 05:00 UTCJul 8, 07:20 UTC2h 20m
2026-07-07 TTW261 - Jul 7, 05:30 UTCJul 7, 09:20 UTC3h 50m
2026-07-07 TTW260 - Jul 7, 00:15 UTCJul 7, 04:15 UTC4h 0m
2026-07-06 TTW663 GMP → KHH Jul 6, 11:50 UTCJul 6, 14:20 UTC2h 30m
2026-07-06 TTW662 KHH → GMP Jul 6, 08:10 UTCJul 6, 10:40 UTC2h 30m
2026-07-06 TTW281 NRT → KHH Jul 6, 03:10 UTCJul 6, 06:30 UTC3h 20m
2026-07-05 TTW200 TPE → NRT Jul 5, 22:40 UTCJul 6, 01:35 UTC2h 55m
2026-07-05 TTW213 KIX → TPE Jul 5, 10:55 UTCJul 5, 13:15 UTC2h 20m
2026-07-05 TTW212 TPE → KIX Jul 5, 06:45 UTCJul 5, 09:10 UTC2h 25m
2026-07-05 TTW247 - Jul 5, 04:40 UTCJul 5, 05:05 UTC25m
2026-07-05 TTW247 - Jul 5, 03:15 UTCJul 5, 03:30 UTC15m
2026-07-05 TTW246 - Jul 5, 01:05 UTCJul 5, 01:20 UTC15m
2026-07-04 TTW246 - Jul 4, 23:30 UTCJul 4, 23:45 UTC15m
2026-07-04 TTW607 PUS → TPE Jul 4, 11:55 UTCJul 4, 14:05 UTC2h 10m
2026-07-04 TTW606 - Jul 4, 10:20 UTCJul 4, 10:45 UTC25m
2026-07-04 TTW606 - Jul 4, 08:50 UTCJul 4, 09:10 UTC20m
2026-07-04 TTW235 - Jul 4, 06:40 UTCJul 4, 06:55 UTC15m
2026-07-04 TTW235 - Jul 4, 03:20 UTCJul 4, 05:30 UTC2h 10m
2026-07-03 TTW234 - Jul 3, 23:50 UTCJul 4, 01:55 UTC2h 5m
2026-07-03 TTW234 - Jul 3, 22:35 UTCJul 3, 22:50 UTC15m
2026-07-03 TTW603 ICN → TPE Jul 3, 15:50 UTCJul 3, 17:55 UTC2h 5m
2026-07-03 TTW602 TPE → ICN Jul 3, 12:25 UTCJul 3, 14:35 UTC2h 10m
2026-07-03 TTW753 - Jul 3, 07:35 UTCJul 3, 10:45 UTC3h 10m
2026-07-03 TTW752 - Jul 3, 03:10 UTCJul 3, 06:00 UTC2h 50m
2026-07-03 TTW737 - Jul 3, 00:55 UTCJul 3, 01:20 UTC25m
2026-07-02 TTW736 - Jul 2, 22:50 UTCJul 2, 23:15 UTC25m
2026-07-02 TTW603 ICN → TPE Jul 2, 15:50 UTCJul 2, 17:45 UTC1h 55m
2026-07-02 TTW602 TPE → ICN Jul 2, 12:35 UTCJul 2, 14:40 UTC2h 5m
2026-07-02 TTW253 - Jul 2, 10:30 UTCJul 2, 11:05 UTC35m
2026-07-02 TTW253 - Jul 2, 08:10 UTCJul 2, 09:05 UTC55m
2026-07-02 TTW252 - Jul 2, 04:30 UTCJul 2, 06:55 UTC2h 25m
2026-07-01 TTW721 - Jul 1, 11:35 UTCJul 1, 12:00 UTC25m
2026-07-01 TTW720 - Jul 1, 06:55 UTCJul 1, 07:15 UTC20m
2026-07-01 TTW211 - Jul 1, 03:00 UTCJul 1, 05:30 UTC2h 30m
2026-06-30 TTW210 TPE → KIX Jun 30, 23:00 UTCJul 1, 01:15 UTC2h 15m
2026-06-30 TTW552 KHH → TPE Jun 30, 10:05 UTCJun 30, 15:25 UTC5h 20m
2026-06-30 TTW281 - Jun 30, 07:45 UTCJun 30, 08:40 UTC55m

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 B-50027 page for operator, model, and routing details .

Mode-S 89905C frequently asked

What is Mode-S code 89905C?
89905C is an ICAO 24-bit transponder address. Allocated to Taiwan. Assigned to B-50027.
Where is Mode-S 89905C registered?
Mode-S code 89905C is allocated to Taiwan (TW). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 89905C broadcasting right now?
No active broadcast right now. Last signal was 2h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 89905C, octal 42310134, decimal 9,015,388.
What flights does 89905C operate?
Mode-S 89905C has broadcast 20 distinct callsigns, including TTW281, TTW280, TTW200, TTW585, TTW552.