Apparatus

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sensors Mode-S transponder

8851E1

ICAO 24-bit transponder address · allocated to Thailand

Currently assigned to HS-TOA · AIRBUS A-321neo

Hex
8851E1
Octal
42050741
Decimal
8,933,857
Country
TH
Tail
HS-TOA
Type
A21N
No current signal · last broadcast 2h ago
Flights observed
179
Distinct callsigns
20
Country
TH
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S 8851E1.

Country allocation

The ICAO 24-bit address 8851E1 falls within the block assigned to Thailand (TH) by ICAO Annex 10, Volume III. Every aircraft registered in Thailand 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
THA675 Thai Airways International 15 2026-05-29
THA674 Thai Airways International 14 2026-05-29
THA408 Thai Airways International 11 2026-05-07
THA407 Thai Airways International 11 2026-05-07
THA633 Thai Airways International 10 2026-05-29
THA632 Thai Airways International 10 2026-05-29
THA637 Thai Airways International 8 2026-05-04
THA636 Thai Airways International 7 2026-05-03
THA331 - 5 2026-04-13
THA222 Thai Airways International 5 2026-05-25
THA621 Thai Airways International 4 2026-05-20
THA332 Thai Airways International 4 2026-04-13
THA322 Thai Airways International 4 2026-05-28
THA133 Thai Airways International 4 2026-05-08
THA268 Thai Airways International 3 2026-05-09
THA250 Thai Airways International 3 2026-05-02
THA212 Thai Airways International 3 2026-05-16
THA208 Thai Airways International 3 2026-04-27
THA132 Thai Airways International 3 2026-05-08
THA111 Thai Airways International 3 2026-05-02

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 THA675 PEK → BKK May 29, 23:10 UTCMay 30, 03:40 UTC4h 30m
2026-05-29 THA674 BKK → PEK May 29, 17:20 UTCMay 29, 19:00 UTC1h 40m
2026-05-29 THA633 TPE → BKK May 29, 06:40 UTCMay 29, 09:55 UTC3h 15m
2026-05-29 THA632 BKK → TPE May 29, 01:55 UTCMay 29, 05:05 UTC3h 10m
2026-05-28 THA322 DAC → BKK May 28, 07:40 UTCMay 28, 09:45 UTC2h 5m
2026-05-28 THA321 BKK → DAC May 28, 04:00 UTCMay 28, 06:05 UTC2h 5m
2026-05-28 THA402 SIN → BKK May 28, 00:35 UTCMay 28, 02:30 UTC1h 55m
2026-05-27 THA401 BKK → SIN May 27, 12:35 UTCMay 27, 14:15 UTC1h 40m
2026-05-27 THA322 DAC → BKK May 27, 08:25 UTCMay 27, 09:50 UTC1h 25m
2026-05-27 THA322 DAC → BKK May 27, 07:45 UTCMay 27, 07:55 UTC10m
2026-05-27 THA322 DAC → BKK May 27, 05:40 UTCMay 27, 05:59 UTC20m
2026-05-27 THA321 BKK → DAC May 27, 03:50 UTCMay 27, 04:59 UTC1h 10m
2026-05-26 THA635 TPE → BKK May 26, 11:00 UTCMay 26, 14:14 UTC3h 15m
2026-05-26 THA634 BKK → TPE May 26, 06:04 UTCMay 26, 09:35 UTC3h 30m
2026-05-25 THA222 HKT → BKK May 25, 12:30 UTCMay 25, 15:40 UTC3h 10m
2026-05-25 THA633 TPE → BKK May 25, 06:50 UTCMay 25, 10:05 UTC3h 15m
2026-05-25 THA632 BKK → TPE May 25, 01:55 UTCMay 25, 05:15 UTC3h 20m
2026-05-24 THA324 DEL → BKK May 24, 06:20 UTCMay 24, 10:05 UTC3h 45m
2026-05-24 THA323 BKK → DEL May 24, 00:45 UTCMay 24, 04:40 UTC3h 55m
2026-05-23 THA221 BKK → HKT May 23, 12:35 UTCMay 23, 15:45 UTC3h 10m
2026-05-22 THA414 SIN → BKK May 22, 08:20 UTCMay 22, 10:25 UTC2h 5m
2026-05-22 THA413 BKK → SIN May 22, 04:45 UTCMay 22, 06:25 UTC1h 40m
2026-05-22 THA021 UBP → BKK May 22, 02:00 UTCMay 22, 02:40 UTC40m
2026-05-22 THA020 BKK → UBP May 22, 00:15 UTCMay 22, 00:45 UTC30m
2026-05-21 THA222 HKT → BKK May 21, 12:15 UTCMay 21, 15:30 UTC3h 15m
2026-05-21 THA633 TPE → BKK May 21, 06:40 UTCMay 21, 10:00 UTC3h 20m
2026-05-21 THA632 BKK → TPE May 21, 01:50 UTCMay 21, 05:20 UTC3h 30m
2026-05-20 THA621 MNL → BKK May 20, 05:05 UTCMay 20, 08:05 UTC3h 0m
2026-05-20 THA621 MNL → BKK May 20, 00:40 UTCMay 20, 03:25 UTC2h 45m
2026-05-19 THA621 MNL → BKK May 19, 05:40 UTCMay 19, 08:35 UTC2h 55m
2026-05-19 THA620 BKK → MNL May 19, 01:20 UTCMay 19, 04:15 UTC2h 55m
2026-05-18 THA621 MNL → BKK May 18, 05:15 UTCMay 18, 08:20 UTC3h 5m
2026-05-18 THA620 BKK → MNL May 18, 00:50 UTCMay 18, 03:40 UTC2h 50m
2026-05-17 THA633 TPE → BKK May 17, 06:35 UTCMay 17, 10:00 UTC3h 25m
2026-05-17 THA632 BKK → TPE May 17, 01:45 UTCMay 17, 05:10 UTC3h 25m
2026-05-16 THA121 CNX → BKK May 16, 14:31 UTCMay 16, 15:25 UTC55m
2026-05-16 THA120 BKK → CNX May 16, 12:40 UTCMay 16, 13:35 UTC55m
2026-05-16 THA212 HKT → BKK May 16, 07:20 UTCMay 16, 10:35 UTC3h 15m
2026-05-15 THA222 HKT → BKK May 15, 12:40 UTCMay 15, 16:05 UTC3h 24m
2026-05-15 THA633 TPE → BKK May 15, 06:45 UTCMay 15, 10:20 UTC3h 35m
2026-05-15 THA632 BKK → TPE May 15, 01:50 UTCMay 15, 05:10 UTC3h 20m
2026-05-14 THA633 TPE → BKK May 14, 07:05 UTCMay 14, 10:31 UTC3h 25m
2026-05-14 THA632 BKK → TPE May 14, 01:45 UTCMay 14, 05:00 UTC3h 15m
2026-05-13 THA633 TPE → BKK May 13, 06:35 UTCMay 13, 10:15 UTC3h 40m
2026-05-13 THA632 BKK → TPE May 13, 01:55 UTCMay 13, 05:15 UTC3h 20m
2026-05-12 THA221 BKK → HKT May 12, 12:20 UTCMay 12, 15:30 UTC3h 10m
2026-05-12 THA633 TPE → BKK May 12, 06:25 UTCMay 12, 09:45 UTC3h 20m
2026-05-12 THA632 BKK → TPE May 12, 04:05 UTCMay 12, 05:10 UTC1h 5m
2026-05-11 THA633 TPE → BKK May 11, 06:25 UTCMay 11, 09:50 UTC3h 25m
2026-05-11 THA632 BKK → TPE May 11, 01:45 UTCMay 11, 05:00 UTC3h 15m

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 HS-TOA page for operator, model, and routing details .

Mode-S 8851E1 frequently asked

What is Mode-S code 8851E1?
8851E1 is an ICAO 24-bit transponder address. Allocated to Thailand. Assigned to HS-TOA.
Where is Mode-S 8851E1 registered?
Mode-S code 8851E1 is allocated to Thailand (TH). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 8851E1 broadcasting right now?
No active broadcast right now. Last signal was 2h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 8851E1, octal 42050741, decimal 8,933,857.
What flights does 8851E1 operate?
Mode-S 8851E1 has broadcast 20 distinct callsigns, including THA675, THA674, THA408, THA407, THA633.