Apparatus

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sensors Mode-S transponder

8991BE

ICAO 24-bit transponder address · allocated to Taiwan

Currently assigned to B-18317 · AIRBUS A-330-300

Hex
8991BE
Octal
42310676
Decimal
9,015,742
Country
TW
Tail
B-18317
Type
A333
No current signal · last broadcast 11h ago
Flights observed
223
Distinct callsigns
20
Country
TW
Last broadcast
11h ago

Last known position

Most recent position reported by Mode-S 8991BE.

Country allocation

The ICAO 24-bit address 8991BE 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
CAL111 - 15 2026-07-09
CAL834 - 11 2026-07-08
CAL833 China Airlines 11 2026-07-07
CAL110 - 10 2026-07-08
CAL109 - 10 2026-07-13
CAL105 - 10 2026-07-04
CAL919 China Airlines 9 2026-04-24
CAL704 - 9 2026-07-14
CAL703 - 9 2026-07-14
CAL527 - 9 2026-07-05
CAL528 - 8 2026-07-05
MDA992 - 7 2026-07-03
CAL173 China Airlines 7 2026-05-09
CAL920 China Airlines 6 2026-04-24
CAL108 - 6 2026-07-13
CAL104 - 6 2026-07-04
CAL172 - 5 2026-07-10
CAL163 China Airlines 5 2026-05-16
CAL162 China Airlines 5 2026-05-16
CAL161 China Airlines 5 2026-05-11

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 CAL704 - Jul 14, 09:35 UTCJul 14, 11:20 UTC1h 45m
2026-07-14 CAL703 - Jul 14, 05:50 UTCJul 14, 07:40 UTC1h 50m
2026-07-13 CAL109 - Jul 13, 14:20 UTCJul 13, 14:45 UTC25m
2026-07-13 CAL109 - Jul 13, 12:00 UTCJul 13, 13:20 UTC1h 20m
2026-07-13 CAL108 TPE → NRT Jul 13, 07:10 UTCJul 13, 10:05 UTC2h 55m
2026-07-12 CAL2173 - Jul 12, 05:25 UTCJul 12, 05:50 UTC25m
2026-07-12 CAL2173 - Jul 12, 03:40 UTCJul 12, 04:15 UTC35m
2026-07-10 CAL172 - Jul 10, 06:30 UTCJul 10, 08:50 UTC2h 20m
2026-07-10 CAL702 - Jul 10, 03:00 UTCJul 10, 04:50 UTC1h 50m
2026-07-09 CAL701 - Jul 9, 23:40 UTCJul 10, 01:20 UTC1h 40m
2026-07-09 CAL704 - Jul 9, 09:05 UTCJul 9, 10:50 UTC1h 45m
2026-07-09 CAL703 TPE → MNL Jul 9, 05:45 UTCJul 9, 07:45 UTC2h 0m
2026-07-09 CAL111 - Jul 9, 03:10 UTCJul 9, 04:20 UTC1h 10m
2026-07-09 CAL111 - Jul 9, 02:20 UTCJul 9, 02:35 UTC15m
2026-07-08 CAL110 - Jul 8, 23:00 UTCJul 9, 00:35 UTC1h 35m
2026-07-08 CAL834 - Jul 8, 04:15 UTCJul 8, 07:45 UTC3h 30m
2026-07-07 CAL833 TPE → BKK Jul 7, 23:10 UTCJul 8, 02:25 UTC3h 15m
2026-07-07 CAL131 - Jul 7, 09:30 UTCJul 7, 09:55 UTC25m
2026-07-07 CAL131 - Jul 7, 06:25 UTCJul 7, 08:15 UTC1h 50m
2026-07-07 CAL130 - Jul 7, 01:05 UTCJul 7, 04:35 UTC3h 30m
2026-07-06 CAL123 KJP → TPE Jul 6, 11:55 UTCJul 6, 13:00 UTC1h 5m
2026-07-06 CAL122 - Jul 6, 09:20 UTCJul 6, 09:45 UTC25m
2026-07-06 CAL153 - Jul 6, 07:05 UTCJul 6, 07:35 UTC30m
2026-07-06 CAL153 - Jul 6, 05:15 UTCJul 6, 05:55 UTC40m
2026-07-06 CAL152 - Jul 6, 03:00 UTCJul 6, 03:40 UTC40m
2026-07-06 CAL152 - Jul 6, 01:25 UTCJul 6, 01:40 UTC15m
2026-07-05 CAL528 - Jul 5, 10:40 UTCJul 5, 12:05 UTC1h 25m
2026-07-05 CAL527 - Jul 5, 07:15 UTCJul 5, 08:35 UTC1h 20m
2026-07-05 CAL702 - Jul 5, 03:00 UTCJul 5, 04:45 UTC1h 45m
2026-07-04 CAL701 TPE → MNL Jul 4, 23:40 UTCJul 5, 01:30 UTC1h 50m
2026-07-04 CAL105 - Jul 4, 12:20 UTCJul 4, 12:35 UTC15m
2026-07-04 CAL105 - Jul 4, 09:30 UTCJul 4, 11:45 UTC2h 15m
2026-07-04 CAL104 TPE → NRT Jul 4, 04:40 UTCJul 4, 07:35 UTC2h 55m
2026-07-03 CAL528 - Jul 3, 11:30 UTCJul 3, 12:05 UTC35m
2026-07-03 CAL527 - Jul 3, 07:35 UTCJul 3, 09:05 UTC1h 30m
2026-07-03 MDA992 TPE → TPE Jul 3, 01:30 UTCJul 3, 05:50 UTC4h 20m
2026-07-02 CAL105 - Jul 2, 11:55 UTCJul 2, 12:20 UTC25m
2026-07-02 CAL105 - Jul 2, 09:15 UTCJul 2, 10:50 UTC1h 35m
2026-07-02 CAL104 TPE → NRT Jul 2, 04:45 UTCJul 2, 07:30 UTC2h 45m
2026-07-01 CAL704 - Jul 1, 09:50 UTCJul 1, 11:30 UTC1h 40m
2026-07-01 CAL703 - Jul 1, 06:15 UTCJul 1, 08:00 UTC1h 45m
2026-07-01 CAL702 - Jul 1, 02:55 UTCJul 1, 04:45 UTC1h 50m
2026-06-30 CAL701 TPE → MNL Jun 30, 23:55 UTCJul 1, 01:35 UTC1h 40m
2026-06-29 TEST1234 TPE → TPE Jun 29, 20:49 UTCJun 29, 20:59 UTC10m
2026-06-29 TEST1234 TPE → TPE Jun 29, 20:35 UTCJun 29, 20:44 UTC10m
2026-05-25 CAL834 BKK → TPE May 25, 04:10 UTCMay 25, 07:30 UTC3h 20m
2026-05-24 CAL833 TPE → BKK May 24, 23:20 UTCMay 25, 02:35 UTC3h 15m
2026-05-24 CAL836 BKK → TPE May 24, 10:55 UTCMay 24, 14:25 UTC3h 30m
2026-05-24 CAL835 TPE → BKK May 24, 05:55 UTCMay 24, 09:10 UTC3h 15m
2026-05-24 CAL602 HKG → TPE May 24, 02:25 UTCMay 24, 03:50 UTC1h 25m

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-18317 page for operator, model, and routing details .

Mode-S 8991BE frequently asked

What is Mode-S code 8991BE?
8991BE is an ICAO 24-bit transponder address. Allocated to Taiwan. Assigned to B-18317.
Where is Mode-S 8991BE registered?
Mode-S code 8991BE is allocated to Taiwan (TW). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 8991BE broadcasting right now?
No active broadcast right now. Last signal was 11h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 8991BE, octal 42310676, decimal 9,015,742.
What flights does 8991BE operate?
Mode-S 8991BE has broadcast 20 distinct callsigns, including CAL111, CAL834, CAL833, CAL110, CAL109.