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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
No current signal · last broadcast Jul 26, 13:55 UTC
Flights observed
467
Distinct callsigns
20
Country
TH
Last broadcast
Jul 26, 13:55 UTC

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 - 29 2026-07-22
THA318 Thai Airways International 26 2026-07-22
THA620 Thai Airways International 21 2026-07-26
THA621 Thai Airways International 20 2026-07-26
THA413 Thai Airways International 20 2026-07-22
THA636 Thai Airways International 19 2026-07-26
THA408 Thai Airways International 18 2026-06-30
THA407 - 18 2026-06-30
THA637 Thai Airways International 17 2026-07-24
THA414 - 17 2026-07-13
THA331 Thai Airways International 17 2026-07-24
THA332 Thai Airways International 16 2026-07-24
THA204 - 14 2026-06-30
THA624 Thai Airways International 12 2026-07-24
THA133 Thai Airways International 12 2026-05-05
THA625 Thai Airways International 11 2026-07-24
THA304 - 11 2026-07-18
THA303 - 11 2026-07-18
THA132 Thai Airways International 10 2026-05-05
THA633 Thai Airways International 8 2026-05-28

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 THA636 BKK → TPE Jul 26, 10:25 UTCJul 26, 13:55 UTC3h 30m
2026-07-26 THA621 MNL → BKK Jul 26, 05:55 UTCJul 26, 08:45 UTC2h 51m
2026-07-26 THA620 BKK → MNL Jul 26, 01:25 UTCJul 26, 04:30 UTC3h 5m
2026-07-25 THA344 AMD → BKK Jul 25, 14:25 UTCJul 25, 23:45 UTC9h 20m
2026-07-25 THA619 TFU → BKK Jul 25, 04:10 UTCJul 25, 11:35 UTC7h 25m
2026-07-24 THA332 DEL → BKK Jul 24, 22:10 UTCJul 25, 02:00 UTC3h 50m
2026-07-24 THA331 BKK → DEL Jul 24, 16:50 UTCJul 24, 20:40 UTC3h 50m
2026-07-24 THA625 MNL → BKK Jul 24, 12:30 UTCJul 24, 15:15 UTC2h 45m
2026-07-24 THA624 BKK → MNL Jul 24, 07:45 UTCJul 24, 10:50 UTC3h 5m
2026-07-24 THA637 TPE → BKK Jul 24, 00:35 UTCJul 24, 03:50 UTC3h 15m
2026-07-23 THA636 BKK → TPE Jul 23, 10:55 UTCJul 23, 14:25 UTC3h 30m
2026-07-23 THA621 MNL → BKK Jul 23, 05:25 UTCJul 23, 08:50 UTC3h 25m
2026-07-23 THA620 BKK → MNL Jul 23, 00:45 UTCJul 23, 03:40 UTC2h 55m
2026-07-22 THA318 BOM → BKK Jul 22, 19:00 UTCJul 22, 23:00 UTC4h 0m
2026-07-22 THA317 - Jul 22, 16:35 UTCJul 22, 17:10 UTC35m
2026-07-22 THA317 - Jul 22, 12:50 UTCJul 22, 15:15 UTC2h 25m
2026-07-22 THA413 BKK → SIN Jul 22, 04:50 UTCJul 22, 10:25 UTC5h 35m
2026-07-21 THA332 DEL → BKK Jul 21, 22:05 UTCJul 22, 01:50 UTC3h 45m
2026-07-21 THA331 BKK → DEL Jul 21, 16:35 UTCJul 21, 20:20 UTC3h 45m
2026-07-21 THA250 KBV → BKK Jul 21, 14:05 UTCJul 21, 14:55 UTC50m
2026-07-21 THA249 - Jul 21, 11:55 UTCJul 21, 12:35 UTC40m
2026-07-21 THA621 MNL → BKK Jul 21, 05:45 UTCJul 21, 08:35 UTC2h 50m
2026-07-21 THA620 BKK → MNL Jul 21, 01:20 UTCJul 21, 04:25 UTC3h 5m
2026-07-20 THA625 MNL → BKK Jul 20, 12:50 UTCJul 20, 15:45 UTC2h 55m
2026-07-20 THA624 BKK → MNL Jul 20, 10:10 UTCJul 20, 11:00 UTC50m
2026-07-20 THA624 BKK → MNL Jul 20, 07:55 UTCJul 20, 08:05 UTC10m
2026-07-20 THA675 PEK → BKK Jul 20, 03:30 UTCJul 20, 03:50 UTC20m
2026-07-19 THA675 PEK → BKK Jul 19, 23:20 UTCJul 20, 02:30 UTC3h 10m
2026-07-19 THA674 BKK → PEK Jul 19, 18:25 UTCJul 19, 18:45 UTC20m
2026-07-19 THA674 BKK → PEK Jul 19, 17:10 UTCJul 19, 17:20 UTC10m
2026-07-19 THA625 - Jul 19, 14:45 UTCJul 19, 15:15 UTC30m
2026-07-19 THA625 - Jul 19, 12:25 UTCJul 19, 12:50 UTC25m
2026-07-19 THA624 BKK → MNL Jul 19, 10:05 UTCJul 19, 10:45 UTC40m
2026-07-19 THA624 BKK → MNL Jul 19, 07:45 UTCJul 19, 08:00 UTC15m
2026-07-19 THA675 - Jul 19, 03:05 UTCJul 19, 03:25 UTC20m
2026-07-18 THA675 - Jul 18, 23:10 UTCJul 19, 02:10 UTC3h 0m
2026-07-18 THA674 - Jul 18, 17:10 UTCJul 18, 18:50 UTC1h 40m
2026-07-18 THA304 - Jul 18, 12:50 UTCJul 18, 13:50 UTC1h 0m
2026-07-18 THA303 - Jul 18, 10:40 UTCJul 18, 11:40 UTC1h 0m
2026-07-18 THA621 MNL → BKK Jul 18, 07:55 UTCJul 18, 08:20 UTC25m
2026-07-18 THA621 MNL → BKK Jul 18, 05:30 UTCJul 18, 06:00 UTC30m
2026-07-18 THA620 BKK → MNL Jul 18, 03:05 UTCJul 18, 03:55 UTC50m
2026-07-18 THA620 BKK → MNL Jul 18, 01:00 UTCJul 18, 01:15 UTC15m
2026-07-17 THA304 - Jul 17, 12:55 UTCJul 17, 13:55 UTC1h 0m
2026-07-17 THA303 BKK → RGN Jul 17, 10:40 UTCJul 17, 11:39 UTC1h 0m
2026-07-17 THA621 - Jul 17, 05:45 UTCJul 17, 08:35 UTC2h 50m
2026-07-17 THA620 - Jul 17, 03:14 UTCJul 17, 04:14 UTC1h 0m
2026-07-17 THA620 - Jul 17, 01:05 UTCJul 17, 01:20 UTC15m
2026-07-16 THA625 - Jul 16, 12:25 UTCJul 16, 15:14 UTC2h 50m
2026-07-16 THA624 - Jul 16, 10:10 UTCJul 16, 10:45 UTC35m

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?
No active broadcast right now. Last signal was Jul 26, 13:55 UTC.
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, THA620, THA621, THA413.