Apparatus

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sensors Mode-S transponder

8991BC

ICAO 24-bit transponder address · allocated to Taiwan

Currently assigned to B-18315 · AIRBUS A-330-300

Hex
8991BC
Octal
42310674
Decimal
9,015,740
Country
TW
Tail
B-18315
Type
A333
Broadcasting now · callsign CAL161 · 40,000 ft
Flights observed
433
Distinct callsigns
20
Country
TW
Last broadcast
Jul 26, 15:35 UTC

Current position

8991BC is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address 8991BC 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
CAL919 China Airlines 25 2026-07-26
CAL173 China Airlines 20 2026-07-21
CAL834 China Airlines 19 2026-07-26
CAL833 China Airlines 19 2026-07-25
CAL111 China Airlines 19 2026-07-20
CAL163 China Airlines 18 2026-07-25
CAL110 - 18 2026-07-20
CAL920 China Airlines 17 2026-07-26
CAL117 China Airlines 17 2026-07-22
CAL161 China Airlines 15 2026-07-25
CAL162 China Airlines 14 2026-07-25
CAL172 China Airlines 13 2026-07-21
CAL702 China Airlines 12 2026-07-24
CAL701 China Airlines 12 2026-07-23
CAL160 China Airlines 12 2026-07-25
CAL105 - 12 2026-07-16
CAL109 - 11 2026-06-28
CAL521 - 10 2026-06-26
CAL104 - 10 2026-07-16
CAL522 - 9 2026-06-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 CAL920 HKG → TPE Jul 26, 14:10 UTCJul 26, 15:35 UTC1h 25m
2026-07-26 CAL919 TPE → HKG Jul 26, 11:45 UTCJul 26, 12:00 UTC15m
2026-07-26 CAL919 TPE → HKG Jul 26, 10:35 UTCJul 26, 11:15 UTC40m
2026-07-26 CAL834 BKK → TPE Jul 26, 04:15 UTCJul 26, 07:25 UTC3h 11m
2026-07-25 CAL833 TPE → BKK Jul 25, 23:15 UTCJul 26, 02:35 UTC3h 20m
2026-07-25 CAL163 ICN → TPE Jul 25, 13:55 UTCJul 25, 14:10 UTC15m
2026-07-25 CAL163 ICN → TPE Jul 25, 12:15 UTCJul 25, 13:00 UTC45m
2026-07-25 CAL162 TPE → ICN Jul 25, 08:20 UTCJul 25, 10:30 UTC2h 10m
2026-07-25 CAL161 ICN → TPE Jul 25, 06:05 UTCJul 25, 06:25 UTC20m
2026-07-25 CAL161 ICN → TPE Jul 25, 04:20 UTCJul 25, 05:00 UTC40m
2026-07-25 CAL160 TPE → ICN Jul 25, 00:20 UTCJul 25, 02:30 UTC2h 10m
2026-07-24 CAL704 MNL → TPE Jul 24, 09:45 UTCJul 24, 11:25 UTC1h 40m
2026-07-24 CAL703 TPE → MNL Jul 24, 06:15 UTCJul 24, 08:10 UTC1h 55m
2026-07-24 CAL702 MNL → TPE Jul 24, 03:05 UTCJul 24, 04:50 UTC1h 45m
2026-07-23 CAL701 TPE → MNL Jul 23, 23:45 UTCJul 24, 01:45 UTC2h 0m
2026-07-23 CAL920 - Jul 23, 12:50 UTCJul 23, 14:20 UTC1h 30m
2026-07-23 CAL919 TPE → HKG Jul 23, 09:30 UTCJul 23, 10:40 UTC1h 10m
2026-07-23 CAL834 BKK → TPE Jul 23, 04:35 UTCJul 23, 07:55 UTC3h 20m
2026-07-22 CAL833 TPE → BKK Jul 22, 23:15 UTCJul 23, 02:25 UTC3h 10m
2026-07-22 CAL117 FUK → TPE Jul 22, 14:10 UTCJul 22, 14:35 UTC25m
2026-07-22 CAL117 FUK → TPE Jul 22, 12:30 UTCJul 22, 13:30 UTC1h 0m
2026-07-22 CAL791 TPE → HAN Jul 22, 02:55 UTCJul 22, 03:20 UTC25m
2026-07-22 CAL791 TPE → HAN Jul 22, 00:45 UTCJul 22, 01:55 UTC1h 10m
2026-07-21 CAL173 KIX → TPE Jul 21, 12:35 UTCJul 21, 12:50 UTC15m
2026-07-21 CAL173 KIX → TPE Jul 21, 10:25 UTCJul 21, 12:00 UTC1h 35m
2026-07-21 CAL172 TPE → KIX Jul 21, 06:30 UTCJul 21, 08:50 UTC2h 20m
2026-07-21 CAL702 MNL → TPE Jul 21, 02:55 UTCJul 21, 04:35 UTC1h 40m
2026-07-20 CAL701 - Jul 20, 23:40 UTCJul 21, 01:20 UTC1h 40m
2026-07-20 CAL173 KIX → TPE Jul 20, 10:25 UTCJul 20, 12:45 UTC2h 20m
2026-07-20 CAL172 TPE → KIX Jul 20, 06:25 UTCJul 20, 08:55 UTC2h 30m
2026-07-20 CAL111 FUK → TPE Jul 20, 04:00 UTCJul 20, 04:30 UTC30m
2026-07-20 CAL111 FUK → TPE Jul 20, 02:40 UTCJul 20, 03:00 UTC20m
2026-07-20 CAL110 - Jul 20, 00:45 UTCJul 20, 01:00 UTC15m
2026-07-19 CAL110 - Jul 19, 23:25 UTCJul 19, 23:50 UTC25m
2026-07-19 CAL836 - Jul 19, 13:00 UTCJul 19, 14:10 UTC1h 10m
2026-07-19 CAL836 - Jul 19, 10:50 UTCJul 19, 11:05 UTC15m
2026-07-19 CAL835 TPE → BKK Jul 19, 08:45 UTCJul 19, 09:00 UTC15m
2026-07-19 CAL835 TPE → BKK Jul 19, 05:50 UTCJul 19, 06:30 UTC40m
2026-07-18 CAL117 - Jul 18, 14:10 UTCJul 18, 14:25 UTC15m
2026-07-18 CAL117 - Jul 18, 12:45 UTCJul 18, 13:05 UTC20m
2026-07-18 CAL116 - Jul 18, 09:20 UTCJul 18, 11:00 UTC1h 40m
2026-07-18 CAL792 - Jul 18, 06:05 UTCJul 18, 07:35 UTC1h 30m
2026-07-18 CAL792 - Jul 18, 05:10 UTCJul 18, 05:20 UTC10m
2026-07-18 CAL791 TPE → HAN Jul 18, 01:10 UTCJul 18, 02:05 UTC55m
2026-07-17 CAL163 - Jul 17, 14:15 UTCJul 17, 14:35 UTC20m
2026-07-17 CAL163 - Jul 17, 12:30 UTCJul 17, 13:15 UTC45m
2026-07-17 CAL162 TPE → ICN Jul 17, 08:04 UTCJul 17, 10:25 UTC2h 20m
2026-07-17 CAL161 ICN → TPE Jul 17, 04:20 UTCJul 17, 06:20 UTC2h 0m
2026-07-17 CAL160 TPE → ICN Jul 17, 00:20 UTCJul 17, 02:30 UTC2h 10m
2026-07-16 CAL105 - Jul 16, 12:09 UTCJul 16, 12:25 UTC15m

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-18315 page for operator, model, and routing details .

Mode-S 8991BC frequently asked

What is Mode-S code 8991BC?
8991BC is an ICAO 24-bit transponder address. Allocated to Taiwan. Assigned to B-18315.
Where is Mode-S 8991BC registered?
Mode-S code 8991BC is allocated to Taiwan (TW). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 8991BC broadcasting right now?
Yes. Mode-S 8991BC is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 8991BC, octal 42310674, decimal 9,015,740.
What flights does 8991BC operate?
Mode-S 8991BC has broadcast 20 distinct callsigns, including CAL919, CAL173, CAL834, CAL833, CAL111.