Apparatus

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sensors Mode-S transponder

8990A4

ICAO 24-bit transponder address · allocated to Taiwan

Currently assigned to B-18772 · BOEING 777-200LR

Hex
8990A4
Octal
42310244
Decimal
9,015,460
Country
TW
Tail
B-18772
Type
B77L
Broadcasting now · callsign CAL5312 · 35,000 ft
Flights observed
305
Distinct callsigns
20
Country
TW
Last broadcast
Jul 26, 23:00 UTC

Current position

8990A4 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 8990A4 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
CAL5381 China Airlines 32 2026-07-23
CAL5382 China Airlines 27 2026-07-22
CAL5346 - 24 2026-07-17
CAL5345 - 24 2026-07-18
CAL5309 - 17 2026-07-10
CAL5165 - 15 2026-07-05
CAL5310 - 13 2026-07-09
CAL5142 China Airlines 13 2026-07-26
CAL5141 China Airlines 13 2026-07-26
CAL5312 - 11 2026-07-15
CAL5311 - 11 2026-07-16
CAL5313 China Airlines 10 2026-07-08
CAL5166 - 10 2026-07-03
CAL5522 China Airlines 9 2026-05-19
CAL5314 - 6 2026-07-07
CAL5231 China Airlines 6 2026-07-22
CAL5021 China Airlines 6 2026-05-18
CAL5232 China Airlines 5 2026-07-21
CAL6657 - 4 2026-07-14
CAL5162 China Airlines 4 2026-06-04

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 CAL5141 MIA → IAH Jul 26, 19:55 UTCJul 26, 23:00 UTC3h 5m
2026-07-26 CAL5142 TPE → ANC Jul 26, 05:15 UTCJul 26, 16:50 UTC11h 36m
2026-07-26 CAL5142 TPE → ANC Jul 26, 01:05 UTCJul 26, 03:15 UTC2h 10m
2026-07-25 CAL5141 MIA → IAH Jul 25, 16:25 UTCJul 25, 16:50 UTC25m
2026-07-25 CAL5141 MIA → IAH Jul 25, 14:35 UTCJul 25, 15:10 UTC35m
2026-07-24 CAL5141 MIA → IAH Jul 24, 23:20 UTCJul 25, 12:40 UTC13h 20m
2026-07-24 CAL5142 TPE → ANC Jul 24, 10:00 UTCJul 24, 21:20 UTC11h 20m
2026-07-24 CAL5142 TPE → ANC Jul 24, 05:55 UTCJul 24, 07:55 UTC2h 0m
2026-07-23 CAL5381 MIA → TPE Jul 23, 11:45 UTCJul 23, 23:25 UTC11h 40m
2026-07-23 CAL5381 MIA → TPE Jul 23, 04:20 UTCJul 23, 09:45 UTC5h 25m
2026-07-22 CAL5382 TPE → MIA Jul 22, 21:45 UTCJul 23, 02:25 UTC4h 40m
2026-07-22 CAL5382 TPE → MIA Jul 22, 10:20 UTCJul 22, 19:55 UTC9h 35m
2026-07-22 CAL5231 ORD → ANC Jul 22, 04:35 UTCJul 22, 04:55 UTC20m
2026-07-21 CAL5231 ORD → ANC Jul 21, 19:20 UTCJul 22, 03:15 UTC7h 55m
2026-07-21 CAL5231 ORD → ANC Jul 21, 11:55 UTCJul 21, 17:55 UTC6h 0m
2026-07-21 CAL5232 ANC → ORD Jul 21, 03:50 UTCJul 21, 08:55 UTC5h 5m
2026-07-20 CAL5232 ANC → ORD Jul 20, 19:20 UTCJul 21, 02:10 UTC6h 49m
2026-07-20 CAL5232 ANC → ORD Jul 20, 17:45 UTCJul 20, 18:00 UTC15m
2026-07-20 CAL5141 MIA → IAH Jul 20, 12:35 UTCJul 20, 14:55 UTC2h 20m
2026-07-19 CAL5141 MIA → IAH Jul 19, 20:25 UTCJul 20, 09:40 UTC13h 15m
2026-07-19 CAL5142 TPE → ANC Jul 19, 06:45 UTCJul 19, 18:25 UTC11h 40m
2026-07-19 CAL5142 TPE → KIX Jul 19, 02:45 UTCJul 19, 05:00 UTC2h 15m
2026-07-18 CAL5345 - Jul 18, 23:15 UTCJul 18, 23:50 UTC35m
2026-07-18 CAL5345 - Jul 18, 11:50 UTCJul 18, 22:05 UTC10h 15m
2026-07-18 CAL5345 - Jul 18, 04:45 UTCJul 18, 08:50 UTC4h 5m
2026-07-17 CAL5346 - Jul 17, 22:29 UTCJul 18, 02:45 UTC4h 15m
2026-07-17 CAL5346 - Jul 17, 07:40 UTCJul 17, 19:15 UTC11h 35m
2026-07-16 CAL5311 - Jul 16, 11:25 UTCJul 16, 11:40 UTC15m
2026-07-16 CAL5311 - Jul 16, 02:45 UTCJul 16, 10:10 UTC7h 25m
2026-07-15 CAL5311 JFK → ANC Jul 15, 17:40 UTCJul 16, 01:00 UTC7h 20m
2026-07-15 CAL5312 ANC → JFK Jul 15, 09:00 UTCJul 15, 14:55 UTC5h 55m
2026-07-14 CAL5312 - Jul 14, 23:15 UTCJul 15, 06:35 UTC7h 20m
2026-07-14 CAL5312 - Jul 14, 21:50 UTCJul 14, 22:00 UTC10m
2026-07-14 CAL6658 - Jul 14, 17:40 UTCJul 14, 18:45 UTC1h 5m
2026-07-14 CAL6657 - Jul 14, 11:55 UTCJul 14, 12:15 UTC20m
2026-07-14 CAL6657 - Jul 14, 08:35 UTCJul 14, 09:30 UTC55m
2026-07-13 CAL5345 SFO → TPE Jul 13, 16:25 UTCJul 14, 04:40 UTC12h 15m
2026-07-13 CAL5345 ATL → SFO Jul 13, 09:00 UTCJul 13, 13:10 UTC4h 10m
2026-07-13 CAL5346 SFO → ATL Jul 13, 02:40 UTCJul 13, 06:55 UTC4h 15m
2026-07-12 CAL5346 - Jul 12, 14:50 UTCJul 13, 01:10 UTC10h 20m
2026-07-12 CAL5346 - Jul 12, 13:25 UTCJul 12, 13:40 UTC15m
2026-07-12 CAL5321 - Jul 12, 00:55 UTCJul 12, 10:05 UTC9h 10m
2026-07-11 CAL5321 JFK → ANC Jul 11, 09:20 UTCJul 11, 16:25 UTC7h 5m
2026-07-10 CAL5322 ANC → JFK Jul 10, 22:50 UTCJul 11, 04:55 UTC6h 5m
2026-07-10 CAL5322 - Jul 10, 14:00 UTCJul 10, 21:40 UTC7h 40m
2026-07-10 CAL5322 - Jul 10, 12:25 UTCJul 10, 12:35 UTC10m
2026-07-10 CAL5309 - Jul 10, 09:10 UTCJul 10, 09:30 UTC20m
2026-07-10 CAL5309 - Jul 10, 00:25 UTCJul 10, 07:50 UTC7h 25m
2026-07-09 CAL5309 JFK → ANC Jul 9, 16:00 UTCJul 9, 22:45 UTC6h 45m
2026-07-09 CAL5310 YYZ → JFK Jul 9, 13:00 UTCJul 9, 14:05 UTC1h 5m

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-18772 page for operator, model, and routing details .

Mode-S 8990A4 frequently asked

What is Mode-S code 8990A4?
8990A4 is an ICAO 24-bit transponder address. Allocated to Taiwan. Assigned to B-18772.
Where is Mode-S 8990A4 registered?
Mode-S code 8990A4 is allocated to Taiwan (TW). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 8990A4 broadcasting right now?
Yes. Mode-S 8990A4 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 8990A4, octal 42310244, decimal 9,015,460.
What flights does 8990A4 operate?
Mode-S 8990A4 has broadcast 20 distinct callsigns, including CAL5381, CAL5382, CAL5346, CAL5345, CAL5309.