Apparatus

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sensors Mode-S transponder

8990EF

ICAO 24-bit transponder address · allocated to Taiwan

Currently assigned to B-18777 · BOEING 777-200LR

Hex
8990EF
Octal
42310357
Decimal
9,015,535
Country
TW
Tail
B-18777
Type
B77L
No current signal · last broadcast 1h ago
Flights observed
323
Distinct callsigns
20
Country
TW
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S 8990EF.

Country allocation

The ICAO 24-bit address 8990EF 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
CAL5685 - 17 2026-07-12
CAL5686 - 15 2026-07-13
CAL5663 - 15 2026-06-14
CAL5310 - 14 2026-06-25
CAL5235 - 14 2026-06-30
CAL5835 - 12 2026-06-26
CAL5313 China Airlines 12 2026-06-28
CAL5346 China Airlines 11 2026-05-24
CAL5345 China Airlines 11 2026-05-25
CAL5522 - 10 2026-06-14
CAL5309 - 10 2026-06-26
CAL5236 - 10 2026-06-29
CAL5142 - 10 2026-07-01
CAL5141 - 10 2026-07-02
CAL5314 - 9 2026-06-27
CAL5382 China Airlines 8 2026-06-05
CAL5837 China Airlines 7 2026-06-13
CAL5836 - 6 2026-06-26
CAL5827 - 6 2026-06-28
CAL5705 - 6 2026-06-19

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 CAL5335 - Jul 14, 18:55 UTCJul 14, 19:30 UTC35m
2026-07-14 CAL5335 - Jul 14, 11:30 UTCJul 14, 15:25 UTC3h 55m
2026-07-14 CAL5336 ANC → ORD Jul 14, 04:20 UTCJul 14, 09:35 UTC5h 15m
2026-07-13 CAL5336 TPE → ANC Jul 13, 18:25 UTCJul 14, 03:10 UTC8h 45m
2026-07-13 CAL5686 - Jul 13, 03:55 UTCJul 13, 09:10 UTC5h 15m
2026-07-12 CAL5686 - Jul 12, 15:55 UTCJul 13, 00:01 UTC8h 5m
2026-07-12 CAL5685 - Jul 12, 03:45 UTCJul 12, 12:50 UTC9h 5m
2026-07-12 CAL5685 - Jul 12, 00:40 UTCJul 12, 00:55 UTC15m
2026-07-11 CAL5685 - Jul 11, 18:30 UTCJul 11, 23:35 UTC5h 5m
2026-07-11 CAL5115 - Jul 11, 02:40 UTCJul 11, 16:10 UTC13h 30m
2026-07-09 CAL5116 - Jul 9, 12:15 UTCJul 9, 22:20 UTC10h 5m
2026-07-09 CAL5116 - Jul 9, 10:20 UTCJul 9, 10:35 UTC15m
2026-07-09 CAL5686 - Jul 9, 02:55 UTCJul 9, 08:10 UTC5h 15m
2026-07-09 CAL5686 - Jul 9, 01:30 UTCJul 9, 01:40 UTC10m
2026-07-08 CAL5686 AMS → BOM Jul 8, 15:15 UTCJul 8, 23:20 UTC8h 5m
2026-07-08 CAL5685 - Jul 8, 02:35 UTCJul 8, 12:00 UTC9h 25m
2026-07-07 CAL5685 - Jul 7, 23:35 UTCJul 8, 00:10 UTC35m
2026-07-07 CAL5685 - Jul 7, 17:40 UTCJul 7, 22:35 UTC4h 55m
2026-07-07 CAL5153 - Jul 7, 13:25 UTCJul 7, 13:50 UTC25m
2026-07-07 CAL5153 - Jul 7, 11:05 UTCJul 7, 12:15 UTC1h 10m
2026-07-06 CAL5153 - Jul 6, 21:25 UTCJul 7, 08:30 UTC11h 5m
2026-07-06 CAL5154 - Jul 6, 06:20 UTCJul 6, 18:10 UTC11h 50m
2026-07-06 CAL5137 - Jul 6, 03:05 UTCJul 6, 03:35 UTC30m
2026-07-05 CAL5137 - Jul 5, 14:30 UTCJul 6, 01:50 UTC11h 20m
2026-07-05 CAL5138 - Jul 5, 01:45 UTCJul 5, 11:35 UTC9h 50m
2026-07-04 CAL5138 - Jul 4, 23:50 UTCJul 5, 00:10 UTC20m
2026-07-04 CAL5826 HKG → TPE Jul 4, 18:50 UTCJul 4, 20:10 UTC1h 20m
2026-07-04 CAL5825 - Jul 4, 15:55 UTCJul 4, 16:30 UTC35m
2026-07-04 CAL5825 - Jul 4, 15:00 UTCJul 4, 15:20 UTC20m
2026-07-04 CAL5393 JFK → SEA Jul 4, 08:40 UTCJul 4, 09:10 UTC30m
2026-07-03 CAL5393 JFK → SEA Jul 3, 20:30 UTCJul 4, 07:20 UTC10h 50m
2026-07-03 CAL5393 JFK → SEA Jul 3, 13:10 UTCJul 3, 18:10 UTC5h 0m
2026-07-03 CAL5394 ANC → JFK Jul 3, 03:40 UTCJul 3, 10:05 UTC6h 25m
2026-07-02 CAL5394 - Jul 2, 19:40 UTCJul 3, 02:15 UTC6h 35m
2026-07-02 CAL5394 - Jul 2, 17:55 UTCJul 2, 18:05 UTC10m
2026-07-02 CAL5141 - Jul 2, 11:15 UTCJul 2, 13:40 UTC2h 25m
2026-07-01 CAL5141 - Jul 1, 19:40 UTCJul 2, 08:30 UTC12h 50m
2026-07-01 CAL5142 KIX → ORD Jul 1, 05:20 UTCJul 1, 16:45 UTC11h 25m
2026-07-01 CAL5142 - Jul 1, 02:55 UTCJul 1, 03:35 UTC40m
2026-07-01 CAL5142 - Jul 1, 01:30 UTCJul 1, 01:40 UTC10m
2026-06-30 CAL5235 SEA → TPE Jun 30, 08:45 UTCJun 30, 20:40 UTC11h 55m
2026-06-29 CAL5235 - Jun 29, 22:35 UTCJun 30, 02:15 UTC3h 41m
2026-06-29 CAL5236 ANC → ORD Jun 29, 14:29 UTCJun 29, 20:04 UTC5h 35m
2026-06-29 CAL5236 - Jun 29, 06:05 UTCJun 29, 12:34 UTC6h 30m
2026-06-29 CAL5236 - Jun 29, 04:04 UTCJun 29, 04:14 UTC10m
2026-06-28 CAL5828 - Jun 28, 22:45 UTCJun 29, 00:00 UTC1h 15m
2026-06-28 CAL5827 - Jun 28, 20:04 UTCJun 28, 20:25 UTC20m
2026-06-28 CAL5827 - Jun 28, 19:09 UTCJun 28, 19:29 UTC20m
2026-06-28 CAL5313 ORD → NGO Jun 28, 12:50 UTCJun 28, 13:19 UTC30m
2026-06-28 CAL5313 ORD → NGO Jun 28, 10:39 UTCJun 28, 11:19 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-18777 page for operator, model, and routing details .

Mode-S 8990EF frequently asked

What is Mode-S code 8990EF?
8990EF is an ICAO 24-bit transponder address. Allocated to Taiwan. Assigned to B-18777.
Where is Mode-S 8990EF registered?
Mode-S code 8990EF is allocated to Taiwan (TW). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 8990EF broadcasting right now?
No active broadcast right now. Last signal was 1h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 8990EF, octal 42310357, decimal 9,015,535.
What flights does 8990EF operate?
Mode-S 8990EF has broadcast 20 distinct callsigns, including CAL5685, CAL5686, CAL5663, CAL5310, CAL5235.