Apparatus

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sensors Mode-S transponder

89904B

ICAO 24-bit transponder address · allocated to Taiwan

Currently assigned to B-18665 · BOEING 737-800

Hex
89904B
Octal
42310113
Decimal
9,015,371
Country
TW
Tail
B-18665
Type
B738
No current signal · last broadcast 4h ago
Flights observed
400
Distinct callsigns
20
Country
TW
Last broadcast
4h ago

Last known position

Most recent position reported by Mode-S 89904B.

Country allocation

The ICAO 24-bit address 89904B 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
MDA356 Mandarin Airlines 48 2026-06-20
MDA797 Mandarin Airlines 47 2026-06-20
MDA798 Mandarin Airlines 46 2026-06-19
MDA355 Mandarin Airlines 45 2026-06-19
MDA1857 - 36 2026-06-20
MDA1858 - 17 2026-06-18
CAL198 - 12 2026-07-17
CAL199 - 11 2026-07-18
CAL839 - 10 2026-07-18
CAL132 - 10 2026-07-17
CAL167 - 8 2026-07-17
CAL166 China Airlines 8 2026-07-16
CAL915 China Airlines 7 2026-07-20
CAL840 - 7 2026-07-18
CAL139 - 7 2026-07-16
CAL133 - 7 2026-07-17
CAL601 - 6 2026-07-19
CAL138 - 6 2026-07-15
MDA769 Mandarin Airlines 5 2026-04-30
MDA770 Mandarin Airlines 4 2026-04-29

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-20 CAL916 HKG → TPE Jul 20, 09:55 UTCJul 20, 11:20 UTC1h 25m
2026-07-20 CAL915 TPE → HKG Jul 20, 06:55 UTCJul 20, 08:15 UTC1h 20m
2026-07-20 CAL602 HKG → TPE Jul 20, 02:50 UTCJul 20, 04:10 UTC1h 20m
2026-07-19 CAL601 TPE → HKG Jul 19, 23:30 UTCJul 20, 00:50 UTC1h 20m
2026-07-19 CAL924 HKG → TPE Jul 19, 13:40 UTCJul 19, 15:05 UTC1h 25m
2026-07-19 CAL923 TPE → HKG Jul 19, 10:25 UTCJul 19, 11:55 UTC1h 30m
2026-07-19 CAL910 HKG → TPE Jul 19, 07:00 UTCJul 19, 08:30 UTC1h 30m
2026-07-19 CAL909 TPE → HKG Jul 19, 03:20 UTCJul 19, 04:35 UTC1h 15m
2026-07-19 CAL7898 KHH → TPE Jul 19, 00:20 UTCJul 19, 01:05 UTC45m
2026-07-18 CAL840 - Jul 18, 11:40 UTCJul 18, 14:40 UTC3h 0m
2026-07-18 CAL839 - Jul 18, 09:25 UTCJul 18, 09:35 UTC10m
2026-07-18 CAL839 - Jul 18, 06:45 UTCJul 18, 07:25 UTC40m
2026-07-18 CAL199 - Jul 18, 04:45 UTCJul 18, 05:30 UTC45m
2026-07-18 CAL199 - Jul 18, 03:25 UTCJul 18, 03:35 UTC10m
2026-07-17 CAL198 - Jul 17, 23:30 UTCJul 18, 00:10 UTC40m
2026-07-17 CAL133 - Jul 17, 11:45 UTCJul 17, 12:15 UTC30m
2026-07-17 CAL132 - Jul 17, 08:00 UTCJul 17, 08:20 UTC20m
2026-07-17 CAL167 KIX → KHH Jul 17, 03:30 UTCJul 17, 06:05 UTC2h 35m
2026-07-16 CAL166 KHH → KIX Jul 16, 22:59 UTCJul 17, 01:45 UTC2h 45m
2026-07-16 CAL840 - Jul 16, 12:40 UTCJul 16, 15:49 UTC3h 10m
2026-07-16 CAL839 - Jul 16, 09:50 UTCJul 16, 10:25 UTC35m
2026-07-16 CAL839 - Jul 16, 06:55 UTCJul 16, 07:30 UTC35m
2026-07-16 CAL139 - Jul 16, 03:05 UTCJul 16, 05:25 UTC2h 20m
2026-07-15 CAL138 - Jul 15, 23:15 UTCJul 16, 01:15 UTC2h 0m
2026-07-15 CAL593 KHH → KHH Jul 15, 08:10 UTCJul 15, 14:35 UTC6h 25m
2026-07-15 CAL199 - Jul 15, 03:45 UTCJul 15, 05:10 UTC1h 25m
2026-07-15 CAL198 - Jul 15, 01:30 UTCJul 15, 01:40 UTC10m
2026-07-14 CAL198 - Jul 14, 23:25 UTCJul 15, 00:05 UTC40m
2026-07-14 CAL133 - Jul 14, 11:50 UTCJul 14, 12:20 UTC30m
2026-07-14 CAL132 - Jul 14, 08:00 UTCJul 14, 08:20 UTC20m
2026-07-13 CAL581 KHH → KHH Jul 13, 23:15 UTCJul 14, 05:15 UTC6h 0m
2026-07-13 CAL133 - Jul 13, 11:55 UTCJul 13, 12:25 UTC30m
2026-07-13 CAL132 - Jul 13, 08:05 UTCJul 13, 08:30 UTC25m
2026-07-13 CAL167 KIX → KHH Jul 13, 03:30 UTCJul 13, 06:15 UTC2h 45m
2026-07-12 CAL166 KHH → KIX Jul 12, 23:00 UTCJul 13, 01:45 UTC2h 45m
2026-07-12 CAL199 - Jul 12, 06:01 UTCJul 12, 06:55 UTC55m
2026-07-12 CAL198 - Jul 12, 01:05 UTCJul 12, 01:45 UTC40m
2026-07-11 CAL2840 - Jul 11, 22:05 UTCJul 11, 22:30 UTC25m
2026-07-11 CAL2840 - Jul 11, 19:30 UTCJul 11, 19:45 UTC15m
2026-07-11 CAL839 - Jul 11, 15:15 UTCJul 11, 15:40 UTC25m
2026-07-11 CAL167 - Jul 11, 04:55 UTCJul 11, 07:45 UTC2h 50m
2026-07-09 CAL166 KHH → KIX Jul 9, 23:10 UTCJul 10, 01:45 UTC2h 35m
2026-07-09 CAL840 - Jul 9, 11:35 UTCJul 9, 14:45 UTC3h 10m
2026-07-09 CAL839 - Jul 9, 07:00 UTCJul 9, 10:10 UTC3h 10m
2026-07-09 CAL139 - Jul 9, 03:15 UTCJul 9, 05:40 UTC2h 25m
2026-07-09 CAL138 - Jul 9, 01:05 UTCJul 9, 01:20 UTC15m
2026-07-08 CAL138 - Jul 8, 23:20 UTCJul 9, 00:10 UTC50m
2026-07-08 CAL593 KHH → KHH Jul 8, 08:25 UTCJul 8, 14:55 UTC6h 30m
2026-07-08 CAL199 - Jul 8, 04:55 UTCJul 8, 05:50 UTC55m
2026-07-07 CAL198 - Jul 7, 23:20 UTCJul 8, 00:00 UTC40m

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-18665 page for operator, model, and routing details .

Mode-S 89904B frequently asked

What is Mode-S code 89904B?
89904B is an ICAO 24-bit transponder address. Allocated to Taiwan. Assigned to B-18665.
Where is Mode-S 89904B registered?
Mode-S code 89904B is allocated to Taiwan (TW). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 89904B broadcasting right now?
No active broadcast right now. Last signal was 4h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 89904B, octal 42310113, decimal 9,015,371.
What flights does 89904B operate?
Mode-S 89904B has broadcast 20 distinct callsigns, including MDA356, MDA797, MDA798, MDA355, MDA1857.