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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 Jul 25, 11:40 UTC
Flights observed
388
Distinct callsigns
20
Country
TH
Last broadcast
Jul 25, 11:40 UTC

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
THA614 - 27 2026-06-30
THA332 Thai Airways International 24 2026-07-17
THA331 - 24 2026-07-17
THA675 - 23 2026-07-17
THA674 - 21 2026-07-16
THA615 - 21 2026-06-30
THA408 - 13 2026-07-20
THA407 Thai Airways International 13 2026-07-20
THA633 Thai Airways International 10 2026-05-29
THA632 Thai Airways International 10 2026-05-29
THA621 - 9 2026-07-16
THA413 Thai Airways International 9 2026-07-18
THA637 Thai Airways International 8 2026-05-04
THA620 - 8 2026-07-16
THA636 Thai Airways International 7 2026-05-03
THA414 Thai Airways International 7 2026-07-18
THA250 - 7 2026-07-16
THA249 - 7 2026-07-14
THA625 - 6 2026-07-17
THA624 - 6 2026-07-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 THA216 HKT → BKK Jul 25, 08:20 UTCJul 25, 11:40 UTC3h 20m
2026-07-21 THA111 CNX → BKK Jul 21, 08:45 UTCJul 21, 09:45 UTC1h 0m
2026-07-21 THA110 BKK → CNX Jul 21, 06:50 UTCJul 21, 07:45 UTC55m
2026-07-20 THA408 - Jul 20, 10:45 UTCJul 20, 12:45 UTC2h 0m
2026-07-20 THA407 BKK → SIN Jul 20, 07:20 UTCJul 20, 09:25 UTC2h 5m
2026-07-20 THA003 - Jul 20, 05:00 UTCJul 20, 05:15 UTC15m
2026-07-20 THA002 - Jul 20, 02:45 UTCJul 20, 03:00 UTC15m
2026-07-19 THA111 CNX → BKK Jul 19, 08:45 UTCJul 19, 09:35 UTC50m
2026-07-19 THA110 BKK → CNX Jul 19, 06:50 UTCJul 19, 07:45 UTC55m
2026-07-18 THA318 BOM → BKK Jul 18, 19:30 UTCJul 18, 22:00 UTC2h 30m
2026-07-18 THA318 BOM → BKK Jul 18, 18:00 UTCJul 18, 18:15 UTC15m
2026-07-18 THA317 - Jul 18, 15:35 UTCJul 18, 15:55 UTC20m
2026-07-18 THA317 - Jul 18, 12:10 UTCJul 18, 14:30 UTC2h 20m
2026-07-18 THA414 SIN → BKK Jul 18, 08:30 UTCJul 18, 10:30 UTC2h 0m
2026-07-18 THA413 BKK → SIN Jul 18, 05:50 UTCJul 18, 06:30 UTC40m
2026-07-18 THA413 BKK → SIN Jul 18, 04:35 UTCJul 18, 05:05 UTC30m
2026-07-17 THA332 DEL → BKK Jul 17, 22:05 UTCJul 18, 02:00 UTC3h 55m
2026-07-17 THA331 - Jul 17, 16:49 UTCJul 17, 20:20 UTC3h 30m
2026-07-17 THA625 - Jul 17, 14:44 UTCJul 17, 15:05 UTC20m
2026-07-17 THA625 - Jul 17, 12:15 UTCJul 17, 12:45 UTC30m
2026-07-17 THA624 - Jul 17, 10:00 UTCJul 17, 10:40 UTC40m
2026-07-17 THA624 - Jul 17, 07:40 UTCJul 17, 07:50 UTC10m
2026-07-17 THA675 - Jul 17, 03:39 UTCJul 17, 04:04 UTC25m
2026-07-16 THA675 - Jul 16, 23:40 UTCJul 17, 02:45 UTC3h 5m
2026-07-16 THA674 - Jul 16, 17:45 UTCJul 16, 19:20 UTC1h 35m
2026-07-16 THA250 - Jul 16, 12:49 UTCJul 16, 16:00 UTC3h 10m
2026-07-16 THA621 - Jul 16, 07:40 UTCJul 16, 08:15 UTC35m
2026-07-16 THA621 - Jul 16, 05:15 UTCJul 16, 05:45 UTC30m
2026-07-16 THA620 - Jul 16, 03:00 UTCJul 16, 03:40 UTC40m
2026-07-16 THA620 - Jul 16, 00:45 UTCJul 16, 01:00 UTC15m
2026-07-15 THA324 - Jul 15, 06:40 UTCJul 15, 10:35 UTC3h 55m
2026-07-15 THA323 - Jul 15, 00:45 UTCJul 15, 04:20 UTC3h 35m
2026-07-14 THA249 - Jul 14, 12:05 UTCJul 14, 14:50 UTC2h 45m
2026-07-14 THA414 - Jul 14, 09:55 UTCJul 14, 10:30 UTC35m
2026-07-14 THA414 - Jul 14, 08:15 UTCJul 14, 08:45 UTC30m
2026-07-14 THA413 - Jul 14, 06:10 UTCJul 14, 06:40 UTC30m
2026-07-14 THA413 - Jul 14, 04:45 UTCJul 14, 05:15 UTC30m
2026-07-13 THA332 - Jul 13, 22:05 UTCJul 14, 02:00 UTC3h 55m
2026-07-13 THA331 - Jul 13, 16:35 UTCJul 13, 20:15 UTC3h 40m
2026-07-13 THA250 - Jul 13, 14:10 UTCJul 13, 14:35 UTC25m
2026-07-13 THA249 - Jul 13, 11:35 UTCJul 13, 12:15 UTC40m
2026-07-13 THA621 - Jul 13, 05:10 UTCJul 13, 08:10 UTC3h 0m
2026-07-13 THA620 - Jul 13, 03:01 UTCJul 13, 03:40 UTC40m
2026-07-13 THA620 - Jul 13, 00:45 UTCJul 13, 00:55 UTC10m
2026-07-12 THA324 - Jul 12, 06:25 UTCJul 12, 10:20 UTC3h 55m
2026-07-12 THA323 - Jul 12, 00:50 UTCJul 12, 04:35 UTC3h 45m
2026-07-11 THA249 - Jul 11, 12:30 UTCJul 11, 15:15 UTC2h 45m
2026-07-11 THA414 - Jul 11, 08:25 UTCJul 11, 10:25 UTC2h 0m
2026-07-11 THA413 - Jul 11, 04:25 UTCJul 11, 06:15 UTC1h 50m
2026-07-10 THA332 - Jul 10, 22:30 UTCJul 11, 02:20 UTC3h 50m

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 Jul 25, 11:40 UTC.
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 THA614, THA332, THA331, THA675, THA674.