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sensors Mode-S transponder

8851E2

ICAO 24-bit transponder address · allocated to Thailand

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

Hex
8851E2
Octal
42050742
Decimal
8,933,858
Country
TH
Tail
HS-TOB
Type
A21N
Transponder active on ground
Flights observed
404
Distinct callsigns
20
Country
TH
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S 8851E2.

Country allocation

The ICAO 24-bit address 8851E2 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
THA317 - 25 2026-07-13
THA318 - 23 2026-07-13
THA413 - 19 2026-07-13
THA408 Thai Airways International 18 2026-06-30
THA407 - 18 2026-06-30
THA636 Thai Airways International 17 2026-05-05
THA414 - 17 2026-07-13
THA637 Thai Airways International 16 2026-05-06
THA331 - 14 2026-07-12
THA204 - 14 2026-06-30
THA620 - 13 2026-07-14
THA332 - 13 2026-07-12
THA621 - 12 2026-07-12
THA133 Thai Airways International 12 2026-05-05
THA132 Thai Airways International 10 2026-05-05
THA304 - 9 2026-07-11
THA303 - 9 2026-07-11
THA633 Thai Airways International 8 2026-05-28
THA103 - 8 2026-06-29
THA102 - 8 2026-06-29

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 THA620 - Jul 14, 00:40 UTCJul 14, 00:55 UTC15m
2026-07-13 THA318 - Jul 13, 19:10 UTCJul 13, 21:45 UTC2h 35m
2026-07-13 THA318 - Jul 13, 17:50 UTCJul 13, 18:00 UTC10m
2026-07-13 THA317 - Jul 13, 15:35 UTCJul 13, 15:55 UTC20m
2026-07-13 THA317 - Jul 13, 12:10 UTCJul 13, 14:30 UTC2h 20m
2026-07-13 THA414 - Jul 13, 08:10 UTCJul 13, 10:15 UTC2h 5m
2026-07-13 THA413 - Jul 13, 05:55 UTCJul 13, 06:35 UTC40m
2026-07-13 THA413 - Jul 13, 04:50 UTCJul 13, 05:15 UTC25m
2026-07-12 THA332 - Jul 12, 22:20 UTCJul 13, 02:05 UTC3h 45m
2026-07-12 THA331 - Jul 12, 19:45 UTCJul 12, 20:20 UTC35m
2026-07-12 THA331 - Jul 12, 16:45 UTCJul 12, 19:30 UTC2h 45m
2026-07-12 THA249 - Jul 12, 11:45 UTCJul 12, 14:40 UTC2h 55m
2026-07-12 THA621 - Jul 12, 05:20 UTCJul 12, 08:20 UTC3h 0m
2026-07-12 THA620 - Jul 12, 03:05 UTCJul 12, 03:50 UTC45m
2026-07-12 THA620 - Jul 12, 00:50 UTCJul 12, 01:05 UTC15m
2026-07-11 THA304 - Jul 11, 12:50 UTCJul 11, 13:55 UTC1h 5m
2026-07-11 THA303 BKK → RGN Jul 11, 10:25 UTCJul 11, 11:40 UTC1h 15m
2026-07-11 THA621 - Jul 11, 05:31 UTCJul 11, 08:30 UTC3h 0m
2026-07-11 THA620 - Jul 11, 00:50 UTCJul 11, 03:50 UTC3h 0m
2026-07-10 THA625 - Jul 10, 13:15 UTCJul 10, 16:00 UTC2h 45m
2026-07-10 THA624 - Jul 10, 07:55 UTCJul 10, 11:15 UTC3h 20m
2026-07-09 THA675 - Jul 9, 23:50 UTCJul 10, 04:00 UTC4h 10m
2026-07-09 THA674 - Jul 9, 17:25 UTCJul 9, 18:55 UTC1h 30m
2026-07-09 THA625 - Jul 9, 12:35 UTCJul 9, 15:25 UTC2h 50m
2026-07-09 THA624 - Jul 9, 07:45 UTCJul 9, 10:50 UTC3h 5m
2026-07-09 THA043 - Jul 9, 05:45 UTCJul 9, 06:10 UTC25m
2026-07-09 THA042 - Jul 9, 03:55 UTCJul 9, 04:25 UTC30m
2026-07-09 THA002 - Jul 9, 00:15 UTCJul 9, 02:35 UTC2h 20m
2026-07-08 THA318 - Jul 8, 18:05 UTCJul 8, 21:50 UTC3h 45m
2026-07-08 THA317 - Jul 8, 15:45 UTCJul 8, 16:10 UTC25m
2026-07-08 THA317 - Jul 8, 12:15 UTCJul 8, 14:35 UTC2h 20m
2026-07-08 THA414 - Jul 8, 08:10 UTCJul 8, 10:15 UTC2h 5m
2026-07-08 THA413 - Jul 8, 04:30 UTCJul 8, 06:25 UTC1h 55m
2026-07-07 THA332 DEL → BKK Jul 7, 22:00 UTCJul 8, 01:50 UTC3h 50m
2026-07-07 THA331 - Jul 7, 16:30 UTCJul 7, 20:25 UTC3h 55m
2026-07-07 THA304 RGN → BKK Jul 7, 12:40 UTCJul 7, 13:40 UTC1h 0m
2026-07-07 THA303 - Jul 7, 10:30 UTCJul 7, 11:35 UTC1h 5m
2026-07-07 THA621 MNL → BKK Jul 7, 05:30 UTCJul 7, 08:50 UTC3h 20m
2026-07-07 THA620 - Jul 7, 00:50 UTCJul 7, 03:50 UTC3h 0m
2026-07-06 THA304 RGN → BKK Jul 6, 12:50 UTCJul 6, 13:55 UTC1h 5m
2026-07-06 THA303 - Jul 6, 10:25 UTCJul 6, 11:30 UTC1h 5m
2026-07-06 THA621 - Jul 6, 05:05 UTCJul 6, 08:15 UTC3h 10m
2026-07-06 THA620 - Jul 6, 00:45 UTCJul 6, 03:40 UTC2h 55m
2026-07-05 THA318 - Jul 5, 18:40 UTCJul 5, 22:40 UTC4h 0m
2026-07-05 THA317 - Jul 5, 15:45 UTCJul 5, 16:35 UTC50m
2026-07-05 THA317 - Jul 5, 12:00 UTCJul 5, 13:35 UTC1h 35m
2026-07-05 THA414 - Jul 5, 08:00 UTCJul 5, 10:05 UTC2h 5m
2026-07-05 THA413 - Jul 5, 04:30 UTCJul 5, 06:20 UTC1h 50m
2026-07-04 THA332 DEL → BKK Jul 4, 22:15 UTCJul 5, 02:00 UTC3h 45m
2026-07-04 THA331 - Jul 4, 16:45 UTCJul 4, 20:35 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-TOB page for operator, model, and routing details .

Mode-S 8851E2 frequently asked

What is Mode-S code 8851E2?
8851E2 is an ICAO 24-bit transponder address. Allocated to Thailand. Assigned to HS-TOB.
Where is Mode-S 8851E2 registered?
Mode-S code 8851E2 is allocated to Thailand (TH). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 8851E2 broadcasting right now?
Mode-S 8851E2 is currently broadcasting from the ground.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 8851E2, octal 42050742, decimal 8,933,858.
What flights does 8851E2 operate?
Mode-S 8851E2 has broadcast 20 distinct callsigns, including THA317, THA318, THA413, THA408, THA407.