Apparatus

Try JFK, AAL1290, BAW, or N225AN.

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
Broadcasting now · callsign CAL5314 · 35,000 ft
Flights observed
368
Distinct callsigns
20
Country
TW
Last broadcast
Jul 26, 21:45 UTC

Current position

8990EF is currently broadcasting. Map zoomed to live position.

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 China Airlines 23 2026-07-25
CAL5686 China Airlines 22 2026-07-26
CAL5310 China Airlines 19 2026-07-26
CAL5663 - 17 2026-07-16
CAL5313 China Airlines 15 2026-07-24
CAL5235 - 14 2026-06-30
CAL5835 China Airlines 13 2026-07-22
CAL5309 China Airlines 13 2026-07-21
CAL5522 - 11 2026-07-16
CAL5346 China Airlines 11 2026-05-24
CAL5345 China Airlines 11 2026-05-25
CAL5314 China Airlines 11 2026-07-23
CAL5236 - 10 2026-06-29
CAL5142 - 10 2026-07-01
CAL5141 - 10 2026-07-02
CAL5705 - 8 2026-07-17
CAL5382 China Airlines 8 2026-06-05
CAL5837 China Airlines 7 2026-06-13
CAL5836 China Airlines 7 2026-07-22
CAL5833 - 7 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 CAL5310 TPE → ANC Jul 26, 21:25 UTCJul 26, 21:45 UTC20m
2026-07-26 CAL5310 TPE → ANC Jul 26, 19:40 UTCJul 26, 19:55 UTC15m
2026-07-26 CAL5834 HKG → TPE Jul 26, 15:40 UTCJul 26, 17:00 UTC1h 20m
2026-07-26 CAL5833 - Jul 26, 12:40 UTCJul 26, 12:50 UTC10m
2026-07-26 CAL5833 - Jul 26, 11:25 UTCJul 26, 12:05 UTC40m
2026-07-26 CAL5686 BOM → TPE Jul 26, 03:20 UTCJul 26, 08:55 UTC5h 36m
2026-07-26 CAL5686 BOM → TPE Jul 26, 02:05 UTCJul 26, 02:15 UTC10m
2026-07-25 CAL5686 BOM → TPE Jul 25, 23:35 UTCJul 25, 23:55 UTC20m
2026-07-25 CAL5686 BOM → TPE Jul 25, 15:30 UTCJul 25, 22:50 UTC7h 20m
2026-07-25 CAL5685 BOM → AMS Jul 25, 03:25 UTCJul 25, 12:15 UTC8h 50m
2026-07-25 CAL5685 BOM → AMS Jul 25, 00:40 UTCJul 25, 00:55 UTC15m
2026-07-24 CAL5685 BOM → AMS Jul 24, 18:40 UTCJul 24, 23:35 UTC4h 55m
2026-07-24 CAL5313 ORD → NGO Jul 24, 13:35 UTCJul 24, 14:30 UTC55m
2026-07-24 CAL5313 ORD → NGO Jul 24, 11:25 UTCJul 24, 12:10 UTC45m
2026-07-23 CAL5313 ORD → NGO Jul 23, 20:25 UTCJul 24, 09:10 UTC12h 45m
2026-07-23 CAL5314 NGO → ORD Jul 23, 06:35 UTCJul 23, 17:40 UTC11h 5m
2026-07-23 CAL5314 NGO → ORD Jul 23, 02:10 UTCJul 23, 04:30 UTC2h 20m
2026-07-22 CAL5836 HKG → TPE Jul 22, 21:10 UTCJul 22, 22:40 UTC1h 30m
2026-07-22 CAL5835 TPE → HKG Jul 22, 17:05 UTCJul 22, 18:15 UTC1h 10m
2026-07-22 CAL5834 HKG → TPE Jul 22, 12:20 UTCJul 22, 13:55 UTC1h 35m
2026-07-21 CAL5826 HKG → TPE Jul 21, 19:40 UTCJul 21, 21:15 UTC1h 35m
2026-07-21 CAL5825 TPE → HKG Jul 21, 15:50 UTCJul 21, 17:10 UTC1h 20m
2026-07-21 CAL5309 JFK → ANC Jul 21, 13:25 UTCJul 21, 13:50 UTC25m
2026-07-21 CAL5309 JFK → ANC Jul 21, 04:10 UTCJul 21, 12:05 UTC7h 55m
2026-07-20 CAL5309 JFK → ANC Jul 20, 17:30 UTCJul 21, 00:15 UTC6h 44m
2026-07-20 CAL5310 YYZ → JFK Jul 20, 13:55 UTCJul 20, 15:20 UTC1h 25m
2026-07-20 CAL5310 ANC → YYZ Jul 20, 06:25 UTCJul 20, 12:05 UTC5h 40m
2026-07-19 CAL5310 TPE → ANC Jul 19, 19:40 UTCJul 20, 04:15 UTC8h 35m
2026-07-19 CAL5832 HKG → TPE Jul 19, 15:45 UTCJul 19, 17:15 UTC1h 30m
2026-07-19 CAL5831 TPE → HKG Jul 19, 12:00 UTCJul 19, 13:30 UTC1h 30m
2026-07-19 CAL5686 - Jul 19, 03:45 UTCJul 19, 09:15 UTC5h 30m
2026-07-19 CAL5686 - Jul 19, 02:15 UTCJul 19, 02:25 UTC10m
2026-07-18 CAL5686 - Jul 18, 15:50 UTCJul 19, 00:00 UTC8h 10m
2026-07-18 CAL5685 - Jul 18, 03:05 UTCJul 18, 12:10 UTC9h 5m
2026-07-18 CAL5685 - Jul 18, 00:25 UTCJul 18, 00:39 UTC15m
2026-07-17 CAL5685 - Jul 17, 18:29 UTCJul 17, 23:25 UTC4h 55m
2026-07-17 CAL5705 - Jul 17, 14:30 UTCJul 17, 15:05 UTC35m
2026-07-17 CAL5705 - Jul 17, 12:15 UTCJul 17, 13:25 UTC1h 10m
2026-07-17 CAL5706 - Jul 17, 06:25 UTCJul 17, 09:30 UTC3h 5m
2026-07-16 CAL5522 FRA → TPE Jul 16, 14:10 UTCJul 17, 03:20 UTC13h 10m
2026-07-16 CAL5663 - Jul 16, 03:45 UTCJul 16, 11:30 UTC7h 45m
2026-07-15 CAL5663 - Jul 15, 20:00 UTCJul 16, 02:05 UTC6h 5m
2026-07-15 CAL5834 HKG → TPE Jul 15, 15:35 UTCJul 15, 16:55 UTC1h 20m
2026-07-15 CAL5833 - Jul 15, 11:35 UTCJul 15, 12:55 UTC1h 20m
2026-07-15 CAL5335 - Jul 15, 06:20 UTCJul 15, 06:40 UTC20m
2026-07-14 CAL5335 - Jul 14, 18:55 UTCJul 15, 05:05 UTC10h 9m
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

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?
Yes. Mode-S 8990EF is currently airborne.
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, CAL5310, CAL5663, CAL5313.