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 Jul 22, 12:35 UTC
Flights observed
259
Distinct callsigns
20
Country
TW
Last broadcast
Jul 22, 12:35 UTC

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 China Airlines 16 2026-07-21
CAL833 - 15 2026-07-17
CAL834 - 13 2026-07-17
CAL110 - 12 2026-07-21
CAL105 - 12 2026-07-15
CAL919 - 10 2026-07-17
CAL704 China Airlines 10 2026-07-21
CAL703 China Airlines 10 2026-07-21
CAL109 - 10 2026-07-13
CAL527 - 9 2026-07-05
CAL173 China Airlines 9 2026-07-22
CAL528 - 8 2026-07-05
CAL104 - 8 2026-07-15
MDA992 - 7 2026-07-03
CAL920 - 7 2026-07-17
CAL163 - 7 2026-07-18
CAL161 - 7 2026-07-18
CAL172 China Airlines 6 2026-07-19
CAL162 - 6 2026-07-18
CAL153 China Airlines 6 2026-07-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-22 CAL173 KIX → TPE Jul 22, 12:20 UTCJul 22, 12:35 UTC15m
2026-07-22 CAL702 MNL → TPE Jul 22, 03:00 UTCJul 22, 04:45 UTC1h 45m
2026-07-21 CAL701 - Jul 21, 23:35 UTCJul 22, 01:25 UTC1h 50m
2026-07-21 CAL704 MNL → TPE Jul 21, 09:15 UTCJul 21, 11:00 UTC1h 45m
2026-07-21 CAL703 TPE → MNL Jul 21, 06:05 UTCJul 21, 07:50 UTC1h 45m
2026-07-21 CAL111 FUK → TPE Jul 21, 02:25 UTCJul 21, 04:30 UTC2h 5m
2026-07-21 CAL110 - Jul 21, 00:20 UTCJul 21, 00:40 UTC20m
2026-07-20 CAL110 - Jul 20, 23:05 UTCJul 20, 23:20 UTC15m
2026-07-20 CAL153 KIX → TPE Jul 20, 06:05 UTCJul 20, 08:30 UTC2h 25m
2026-07-20 CAL152 TPE → KIX Jul 20, 02:00 UTCJul 20, 04:30 UTC2h 30m
2026-07-19 CAL173 KIX → TPE Jul 19, 10:35 UTCJul 19, 12:45 UTC2h 10m
2026-07-19 CAL172 TPE → KIX Jul 19, 06:25 UTCJul 19, 08:50 UTC2h 25m
2026-07-19 CAL702 MNL → TPE Jul 19, 02:45 UTCJul 19, 04:35 UTC1h 50m
2026-07-18 CAL701 TPE → MNL Jul 18, 23:40 UTCJul 19, 01:30 UTC1h 50m
2026-07-18 CAL163 - Jul 18, 13:35 UTCJul 18, 13:55 UTC20m
2026-07-18 CAL163 - Jul 18, 11:55 UTCJul 18, 12:30 UTC35m
2026-07-18 CAL162 - Jul 18, 08:05 UTCJul 18, 10:10 UTC2h 5m
2026-07-18 CAL161 - Jul 18, 06:10 UTCJul 18, 06:25 UTC15m
2026-07-18 CAL161 - Jul 18, 04:25 UTCJul 18, 05:10 UTC45m
2026-07-18 CAL160 TPE → ICN Jul 18, 00:29 UTCJul 18, 02:35 UTC2h 5m
2026-07-17 CAL920 HKG → TPE Jul 17, 13:00 UTCJul 17, 14:30 UTC1h 30m
2026-07-17 CAL919 TPE → HKG Jul 17, 09:40 UTCJul 17, 11:00 UTC1h 20m
2026-07-17 CAL834 - Jul 17, 04:10 UTCJul 17, 07:40 UTC3h 30m
2026-07-17 CAL833 - Jul 17, 02:15 UTCJul 17, 02:25 UTC10m
2026-07-16 CAL833 - Jul 16, 23:20 UTCJul 17, 00:14 UTC55m
2026-07-16 CAL117 - Jul 16, 14:00 UTCJul 16, 14:25 UTC25m
2026-07-16 CAL117 - Jul 16, 12:30 UTCJul 16, 12:49 UTC20m
2026-07-16 CAL116 - Jul 16, 10:45 UTCJul 16, 10:59 UTC15m
2026-07-16 CAL116 - Jul 16, 09:25 UTCJul 16, 09:40 UTC15m
2026-07-16 CAL834 - Jul 16, 04:15 UTCJul 16, 07:50 UTC3h 35m
2026-07-16 CAL833 - Jul 16, 02:10 UTCJul 16, 02:25 UTC15m
2026-07-15 CAL833 - Jul 15, 23:20 UTCJul 16, 00:10 UTC50m
2026-07-15 CAL105 - Jul 15, 11:55 UTCJul 15, 12:10 UTC15m
2026-07-15 CAL105 - Jul 15, 09:30 UTCJul 15, 10:45 UTC1h 15m
2026-07-15 CAL104 - Jul 15, 06:10 UTCJul 15, 07:30 UTC1h 20m
2026-07-15 CAL104 - Jul 15, 04:40 UTCJul 15, 04:55 UTC15m
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

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 Jul 22, 12:35 UTC.
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, CAL833, CAL834, CAL110, CAL105.