Apparatus

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sensors Mode-S transponder

8990AD

ICAO 24-bit transponder address · allocated to Taiwan

Currently assigned to B-18651 · BOEING 737-800

Hex
8990AD
Octal
42310255
Decimal
9,015,469
Country
TW
Tail
B-18651
Type
B738
No current signal · last broadcast Jul 26, 12:20 UTC
Flights observed
401
Distinct callsigns
20
Country
TW
Last broadcast
Jul 26, 12:20 UTC

Last known position

Most recent position reported by Mode-S 8990AD.

Country allocation

The ICAO 24-bit address 8990AD 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
MDA1275 - 22 2026-07-03
MDA1276 - 20 2026-07-03
CAL261 - 15 2026-07-02
CAL260 - 14 2026-07-02
MDA1857 Mandarin Airlines 12 2026-05-29
CAL915 - 12 2026-07-06
MDA1858 Mandarin Airlines 11 2026-04-25
MDA212 - 10 2026-07-02
MDA770 Mandarin Airlines 9 2026-04-25
MDA769 Mandarin Airlines 9 2026-04-25
MDA2382 - 9 2026-06-26
MDA2381 - 9 2026-06-25
MDA211 - 9 2026-06-22
MDA1266 - 9 2026-06-26
MDA1265 - 9 2026-06-26
CAL923 - 9 2026-07-09
MDA2070 - 8 2026-07-03
MDA2069 - 8 2026-07-03
CAL916 - 8 2026-07-06
CAL133 China Airlines 8 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 CAL133 OKA → KHH Jul 26, 08:00 UTCJul 26, 12:10 UTC4h 10m
2026-07-25 CAL133 OKA → KHH Jul 25, 11:50 UTCJul 25, 12:10 UTC20m
2026-07-25 CAL132 KHH → OKA Jul 25, 08:00 UTCJul 25, 08:25 UTC25m
2026-07-24 CAL582 PVG → KHH Jul 24, 23:15 UTCJul 25, 05:10 UTC5h 55m
2026-07-24 CAL2133 OKA → KHH Jul 24, 10:55 UTCJul 24, 11:25 UTC30m
2026-07-24 CAL2132 KHH → OKA Jul 24, 07:10 UTCJul 24, 07:40 UTC30m
2026-07-24 CAL139 FUK → KHH Jul 24, 03:25 UTCJul 24, 05:50 UTC2h 25m
2026-07-23 CAL138 KHH → FUK Jul 23, 23:10 UTCJul 24, 01:20 UTC2h 10m
2026-07-23 CAL840 BKK → KHH Jul 23, 11:55 UTCJul 23, 14:55 UTC3h 0m
2026-07-23 CAL839 KHH → BKK Jul 23, 06:45 UTCJul 23, 10:00 UTC3h 15m
2026-07-23 CAL586 - Jul 23, 03:50 UTCJul 23, 04:55 UTC1h 5m
2026-07-23 CAL585 KHH → SZX Jul 23, 00:35 UTCJul 23, 01:45 UTC1h 10m
2026-07-22 CAL133 OKA → KHH Jul 22, 11:45 UTCJul 22, 12:15 UTC30m
2026-07-22 CAL199 KMJ → KHH Jul 22, 05:00 UTCJul 22, 05:25 UTC25m
2026-07-21 CAL198 KHH → KMJ Jul 21, 23:25 UTCJul 22, 00:35 UTC1h 10m
2026-07-21 CAL840 BKK → KHH Jul 21, 11:35 UTCJul 21, 14:40 UTC3h 5m
2026-07-21 CAL839 KHH → BKK Jul 21, 07:00 UTCJul 21, 10:00 UTC3h 0m
2026-07-20 CAL581 KHH → PVG Jul 20, 23:10 UTCJul 21, 04:50 UTC5h 40m
2026-07-20 CAL133 OKA → KHH Jul 20, 11:45 UTCJul 20, 12:15 UTC30m
2026-07-20 CAL132 KHH → OKA Jul 20, 08:00 UTCJul 20, 08:20 UTC20m
2026-07-20 CAL199 KMJ → KHH Jul 20, 03:55 UTCJul 20, 05:25 UTC1h 30m
2026-07-19 CAL198 - Jul 19, 23:35 UTCJul 20, 00:15 UTC40m
2026-07-19 CAL133 OKA → KHH Jul 19, 11:55 UTCJul 19, 12:25 UTC30m
2026-07-19 CAL132 KHH → OKA Jul 19, 09:20 UTCJul 19, 09:30 UTC10m
2026-07-19 CAL132 KHH → OKA Jul 19, 08:05 UTCJul 19, 08:30 UTC25m
2026-07-19 CAL586 - Jul 19, 03:40 UTCJul 19, 04:55 UTC1h 15m
2026-07-19 CAL585 - Jul 19, 00:35 UTCJul 19, 01:45 UTC1h 10m
2026-07-18 CAL133 - Jul 18, 11:40 UTCJul 18, 12:10 UTC30m
2026-07-18 CAL132 - Jul 18, 08:00 UTCJul 18, 08:20 UTC20m
2026-07-17 CAL581 KHH → KHH Jul 17, 23:20 UTCJul 18, 04:55 UTC5h 36m
2026-07-17 CAL139 - Jul 17, 04:54 UTCJul 17, 05:30 UTC35m
2026-07-17 CAL139 - Jul 17, 03:50 UTCJul 17, 04:14 UTC25m
2026-07-17 CAL139 - Jul 17, 03:05 UTCJul 17, 03:14 UTC10m
2026-07-16 CAL138 - Jul 16, 23:15 UTCJul 17, 01:09 UTC1h 55m
2026-07-16 CAL583 KHH → KHH Jul 16, 08:55 UTCJul 16, 14:20 UTC5h 25m
2026-07-16 CAL586 - Jul 16, 03:55 UTCJul 16, 05:05 UTC1h 10m
2026-07-16 CAL585 - Jul 16, 00:35 UTCJul 16, 01:40 UTC1h 5m
2026-07-15 CAL133 - Jul 15, 11:40 UTCJul 15, 12:05 UTC25m
2026-07-15 CAL132 - Jul 15, 08:00 UTCJul 15, 08:20 UTC20m
2026-07-15 CAL167 - Jul 15, 05:45 UTCJul 15, 06:15 UTC30m
2026-07-15 CAL167 - Jul 15, 03:30 UTCJul 15, 05:05 UTC1h 35m
2026-07-14 CAL166 KHH → KIX Jul 14, 23:00 UTCJul 15, 01:40 UTC2h 40m
2026-07-14 CAL840 - Jul 14, 11:40 UTCJul 14, 14:40 UTC3h 0m
2026-07-14 CAL839 - Jul 14, 09:35 UTCJul 14, 10:05 UTC30m
2026-07-14 CAL839 - Jul 14, 06:50 UTCJul 14, 07:30 UTC40m
2026-07-14 CAL139 - Jul 14, 03:05 UTCJul 14, 05:25 UTC2h 20m
2026-07-14 CAL138 - Jul 14, 01:10 UTCJul 14, 01:25 UTC15m
2026-07-13 CAL138 - Jul 13, 23:25 UTCJul 14, 00:15 UTC50m
2026-07-13 CAL199 - Jul 13, 04:30 UTCJul 13, 05:25 UTC55m
2026-07-12 CAL198 - Jul 12, 23:20 UTCJul 13, 00:05 UTC45m

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-18651 page for operator, model, and routing details .

Mode-S 8990AD frequently asked

What is Mode-S code 8990AD?
8990AD is an ICAO 24-bit transponder address. Allocated to Taiwan. Assigned to B-18651.
Where is Mode-S 8990AD registered?
Mode-S code 8990AD is allocated to Taiwan (TW). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 8990AD broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 12:20 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 8990AD, octal 42310255, decimal 9,015,469.
What flights does 8990AD operate?
Mode-S 8990AD has broadcast 20 distinct callsigns, including MDA1275, MDA1276, CAL261, CAL260, MDA1857.