Apparatus

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sensors Mode-S transponder

8990A6

ICAO 24-bit transponder address · allocated to Taiwan

Currently assigned to B-18781 · BOEING 777-200LR

Hex
8990A6
Octal
42310246
Decimal
9,015,462
Country
TW
Tail
B-18781
Type
B77L
No current signal · last broadcast Jul 26, 21:25 UTC
Flights observed
341
Distinct callsigns
20
Country
TW
Last broadcast
Jul 26, 21:25 UTC

Last known position

Most recent position reported by Mode-S 8990A6.

Country allocation

The ICAO 24-bit address 8990A6 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
CAL5686 - 20 2026-06-25
CAL5314 - 19 2026-06-20
CAL5685 - 18 2026-06-24
CAL5313 China Airlines 18 2026-06-21
CAL5310 - 15 2026-06-22
CAL5346 China Airlines 12 2026-07-26
CAL5141 - 12 2026-07-12
CAL5137 - 12 2026-07-08
CAL5825 - 10 2026-07-18
CAL5345 China Airlines 10 2026-07-24
CAL5142 - 10 2026-07-10
CAL5138 - 10 2026-07-07
CAL5309 - 9 2026-06-23
CAL5153 China Airlines 9 2026-06-16
CAL5837 - 8 2026-06-30
CAL5835 - 8 2026-07-06
CAL5831 China Airlines 7 2026-06-07
CAL5162 - 7 2026-06-18
CAL5161 - 7 2026-06-19
CAL5154 China Airlines 7 2026-06-15

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 CAL5346 SFO → ATL Jul 26, 12:00 UTCJul 26, 21:10 UTC9h 10m
2026-07-26 CAL5346 SFO → ATL Jul 26, 10:00 UTCJul 26, 10:20 UTC20m
2026-07-25 CAL5321 ANC → TPE Jul 25, 21:45 UTCJul 26, 06:55 UTC9h 11m
2026-07-25 CAL5321 ANC → TPE Jul 25, 13:00 UTCJul 25, 19:50 UTC6h 50m
2026-07-25 CAL5322 ANC → JFK Jul 25, 04:10 UTCJul 25, 10:25 UTC6h 15m
2026-07-24 CAL5322 ANC → JFK Jul 24, 20:10 UTCJul 25, 02:55 UTC6h 45m
2026-07-24 CAL5322 ANC → JFK Jul 24, 18:35 UTCJul 24, 18:45 UTC10m
2026-07-24 CAL5705 NRT → TPE Jul 24, 15:00 UTCJul 24, 15:40 UTC40m
2026-07-24 CAL5705 NRT → TPE Jul 24, 12:20 UTCJul 24, 13:30 UTC1h 10m
2026-07-24 CAL5706 TPE → NRT Jul 24, 06:10 UTCJul 24, 09:00 UTC2h 50m
2026-07-24 CAL5345 SFO → TPE Jul 24, 02:15 UTCJul 24, 02:40 UTC25m
2026-07-23 CAL5345 SFO → TPE Jul 23, 14:40 UTCJul 24, 00:55 UTC10h 15m
2026-07-23 CAL5345 SFO → TPE Jul 23, 07:35 UTCJul 23, 11:55 UTC4h 20m
2026-07-23 CAL5346 SFO → ATL Jul 23, 01:35 UTCJul 23, 05:40 UTC4h 5m
2026-07-22 CAL5346 SFO → ATL Jul 22, 13:25 UTCJul 22, 23:55 UTC10h 30m
2026-07-22 CAL5346 SFO → ATL Jul 22, 11:45 UTCJul 22, 11:55 UTC10m
2026-07-21 CAL5175 SFO → TPE Jul 21, 21:00 UTCJul 21, 21:30 UTC30m
2026-07-21 CAL5176 - Jul 21, 07:50 UTCJul 21, 17:50 UTC10h 0m
2026-07-21 CAL5176 - Jul 21, 06:20 UTCJul 21, 06:30 UTC10m
2026-07-21 CAL5345 - Jul 21, 02:05 UTCJul 21, 02:25 UTC20m
2026-07-20 CAL5345 - Jul 20, 14:10 UTCJul 21, 00:45 UTC10h 35m
2026-07-20 CAL5345 - Jul 20, 07:20 UTCJul 20, 11:25 UTC4h 5m
2026-07-20 CAL5346 - Jul 20, 01:00 UTCJul 20, 05:15 UTC4h 15m
2026-07-19 CAL5346 - Jul 19, 11:20 UTCJul 19, 23:10 UTC11h 50m
2026-07-19 CAL5834 HKG → TPE Jul 19, 05:55 UTCJul 19, 07:20 UTC1h 25m
2026-07-19 CAL5833 TPE → HKG Jul 19, 01:35 UTCJul 19, 02:55 UTC1h 20m
2026-07-18 CAL5826 HKG → TPE Jul 18, 21:10 UTCJul 18, 22:45 UTC1h 35m
2026-07-18 CAL5825 - Jul 18, 17:40 UTCJul 18, 18:45 UTC1h 5m
2026-07-18 CAL5393 JFK → SEA Jul 18, 14:40 UTCJul 18, 14:55 UTC15m
2026-07-18 CAL5393 JFK → SEA Jul 18, 03:20 UTCJul 18, 13:25 UTC10h 5m
2026-07-17 CAL5393 JFK → SEA Jul 17, 19:30 UTCJul 18, 00:45 UTC5h 15m
2026-07-17 CAL5394 ANC → JFK Jul 17, 11:04 UTCJul 17, 17:09 UTC6h 5m
2026-07-17 CAL5394 ANC → JFK Jul 17, 02:39 UTCJul 17, 09:45 UTC7h 5m
2026-07-17 CAL5394 - Jul 17, 01:05 UTCJul 17, 01:20 UTC15m
2026-07-16 CAL5381 - Jul 16, 21:15 UTCJul 16, 21:45 UTC30m
2026-07-16 CAL5381 - Jul 16, 10:20 UTCJul 16, 20:05 UTC9h 45m
2026-07-16 CAL5381 - Jul 16, 02:40 UTCJul 16, 08:00 UTC5h 20m
2026-07-15 CAL5382 - Jul 15, 19:30 UTCJul 15, 23:55 UTC4h 25m
2026-07-15 CAL5382 - Jul 15, 05:30 UTCJul 15, 17:45 UTC12h 15m
2026-07-15 CAL5235 - Jul 15, 00:30 UTCJul 15, 00:40 UTC10m
2026-07-14 CAL5235 SEA → KMI Jul 14, 13:00 UTCJul 14, 23:15 UTC10h 14m
2026-07-14 CAL5235 ORD → SEA Jul 14, 02:20 UTCJul 14, 06:10 UTC3h 50m
2026-07-13 CAL5236 - Jul 13, 18:10 UTCJul 13, 23:30 UTC5h 20m
2026-07-13 CAL5236 TPE → ANC Jul 13, 07:50 UTCJul 13, 16:30 UTC8h 40m
2026-07-12 CAL5828 HKG → TPE Jul 12, 23:20 UTCJul 13, 00:50 UTC1h 30m
2026-07-12 CAL5827 TPE → HKG Jul 12, 19:20 UTCJul 12, 21:00 UTC1h 40m
2026-07-12 CAL5141 - Jul 12, 12:20 UTCJul 12, 12:45 UTC25m
2026-07-12 CAL5141 - Jul 12, 10:35 UTCJul 12, 11:10 UTC35m
2026-07-10 CAL5141 - Jul 10, 23:50 UTCJul 11, 13:10 UTC13h 20m
2026-07-10 CAL5142 KIX → ORD Jul 10, 08:30 UTCJul 10, 20:20 UTC11h 50m

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-18781 page for operator, model, and routing details .

Mode-S 8990A6 frequently asked

What is Mode-S code 8990A6?
8990A6 is an ICAO 24-bit transponder address. Allocated to Taiwan. Assigned to B-18781.
Where is Mode-S 8990A6 registered?
Mode-S code 8990A6 is allocated to Taiwan (TW). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 8990A6 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:25 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 8990A6, octal 42310246, decimal 9,015,462.
What flights does 8990A6 operate?
Mode-S 8990A6 has broadcast 20 distinct callsigns, including CAL5686, CAL5314, CAL5685, CAL5313, CAL5310.