Apparatus

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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 9h ago
Flights observed
179
Distinct callsigns
20
Country
TH
Last broadcast
9h 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
THA636 Thai Airways International 17 2026-05-05
THA637 Thai Airways International 16 2026-05-06
THA133 Thai Airways International 12 2026-05-05
THA408 Thai Airways International 10 2026-05-15
THA407 Thai Airways International 10 2026-05-15
THA132 Thai Airways International 10 2026-05-05
THA633 Thai Airways International 8 2026-05-28
THA632 Thai Airways International 7 2026-05-28
THA204 Thai Airways International 7 2026-05-15
THA414 Thai Airways International 6 2026-05-29
THA413 Thai Airways International 6 2026-05-29
THA260 Thai Airways International 4 2026-05-04
THA621 Thai Airways International 3 2026-05-25
THA620 Thai Airways International 3 2026-05-25
THA332 Thai Airways International 3 2026-04-15
THA331 Thai Airways International 3 2026-04-14
THA249 Thai Airways International 3 2026-04-23
THA222 Thai Airways International 3 2026-05-29
THA107 Thai Airways International 3 2026-05-18
THA021 Thai Airways International 3 2026-05-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 THA222 HKT → BKK May 29, 12:35 UTCMay 29, 15:45 UTC3h 10m
2026-05-29 THA414 SIN → BKK May 29, 08:10 UTCMay 29, 10:15 UTC2h 5m
2026-05-29 THA413 BKK → SIN May 29, 05:55 UTCMay 29, 06:15 UTC20m
2026-05-29 THA413 BKK → SIN May 29, 04:35 UTCMay 29, 04:45 UTC10m
2026-05-29 THA402 SIN → BKK May 29, 00:25 UTCMay 29, 02:25 UTC2h 0m
2026-05-28 THA401 BKK → SIN May 28, 13:35 UTCMay 28, 14:05 UTC30m
2026-05-28 THA401 BKK → SIN May 28, 12:15 UTCMay 28, 12:25 UTC10m
2026-05-28 THA633 TPE → BKK May 28, 06:35 UTCMay 28, 10:00 UTC3h 25m
2026-05-28 THA632 BKK → TPE May 28, 01:40 UTCMay 28, 05:20 UTC3h 40m
2026-05-27 THA633 TPE → BKK May 27, 07:00 UTCMay 27, 10:15 UTC3h 15m
2026-05-27 THA632 BKK → TPE May 27, 01:44 UTCMay 27, 05:19 UTC3h 35m
2026-05-26 THA633 TPE → BKK May 26, 09:04 UTCMay 26, 09:40 UTC35m
2026-05-26 THA633 TPE → BKK May 26, 06:34 UTCMay 26, 07:24 UTC50m
2026-05-26 THA632 BKK → TPE May 26, 01:49 UTCMay 26, 05:10 UTC3h 20m
2026-05-25 THA218 HKT → BKK May 25, 10:45 UTCMay 25, 14:05 UTC3h 20m
2026-05-25 THA621 MNL → BKK May 25, 05:10 UTCMay 25, 08:05 UTC2h 55m
2026-05-25 THA620 BKK → MNL May 25, 02:55 UTCMay 25, 03:40 UTC45m
2026-05-24 THA222 HKT → BKK May 24, 12:30 UTCMay 24, 15:30 UTC3h 0m
2026-05-24 THA621 MNL → BKK May 24, 06:05 UTCMay 24, 08:50 UTC2h 45m
2026-05-24 THA620 BKK → MNL May 24, 00:50 UTCMay 24, 03:45 UTC2h 55m
2026-05-23 THA316 DEL → BKK May 23, 18:20 UTCMay 23, 21:55 UTC3h 35m
2026-05-23 THA315 BKK → DEL May 23, 12:10 UTCMay 23, 16:10 UTC4h 0m
2026-05-23 THA633 TPE → BKK May 23, 06:50 UTCMay 23, 10:00 UTC3h 10m
2026-05-23 THA632 BKK → TPE May 23, 01:45 UTCMay 23, 05:10 UTC3h 24m
2026-05-22 THA633 TPE → BKK May 22, 07:20 UTCMay 22, 10:35 UTC3h 15m
2026-05-22 THA632 BKK → TPE May 22, 02:05 UTCMay 22, 05:35 UTC3h 30m
2026-05-21 THA621 MNL → BKK May 21, 05:25 UTCMay 21, 08:25 UTC3h 0m
2026-05-21 THA620 BKK → MNL May 21, 00:50 UTCMay 21, 03:40 UTC2h 50m
2026-05-20 THA633 TPE → BKK May 20, 06:50 UTCMay 20, 10:05 UTC3h 15m
2026-05-20 THA632 BKK → TPE May 20, 01:45 UTCMay 20, 05:10 UTC3h 26m
2026-05-19 THA625 MNL → BKK May 19, 12:00 UTCMay 19, 14:55 UTC2h 55m
2026-05-19 THA624 BKK → MNL May 19, 07:40 UTCMay 19, 10:35 UTC2h 55m
2026-05-18 THA222 HKT → BKK May 18, 12:25 UTCMay 18, 15:50 UTC3h 25m
2026-05-18 THA107 CNX → BKK May 18, 06:50 UTCMay 18, 07:55 UTC1h 5m
2026-05-18 THA106 BKK → CNX May 18, 04:55 UTCMay 18, 05:50 UTC55m
2026-05-18 THA021 UBP → BKK May 18, 02:10 UTCMay 18, 02:50 UTC40m
2026-05-18 THA020 BKK → UBP May 18, 00:20 UTCMay 18, 00:45 UTC25m
2026-05-16 THA216 HKT → BKK May 16, 08:01 UTCMay 16, 11:11 UTC3h 10m
2026-05-16 THA105 CNX → BKK May 16, 05:05 UTCMay 16, 06:06 UTC1h 1m
2026-05-16 THA104 BKK → CNX May 16, 03:10 UTCMay 16, 04:05 UTC55m
2026-05-15 THA408 SIN → BKK May 15, 10:55 UTCMay 15, 13:00 UTC2h 5m
2026-05-15 THA407 BKK → SIN May 15, 07:25 UTCMay 15, 09:10 UTC1h 45m
2026-05-15 THA204 HKT → BKK May 15, 01:40 UTCMay 15, 04:55 UTC3h 15m
2026-05-14 THA408 SIN → BKK May 14, 10:40 UTCMay 14, 12:40 UTC2h 0m
2026-05-14 THA407 BKK → SIN May 14, 07:10 UTCMay 14, 08:50 UTC1h 40m
2026-05-14 THA204 HKT → BKK May 14, 01:40 UTCMay 14, 04:51 UTC3h 10m
2026-05-13 THA121 CNX → BKK May 13, 14:15 UTCMay 13, 15:10 UTC55m
2026-05-13 THA120 BKK → CNX May 13, 12:30 UTCMay 13, 13:31 UTC1h 0m
2026-05-13 THA212 HKT → BKK May 13, 07:15 UTCMay 13, 10:35 UTC3h 20m
2026-05-13 THA204 HKT → BKK May 13, 01:40 UTCMay 13, 04:40 UTC3h 0m

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 9h ago.
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 THA636, THA637, THA133, THA408, THA407.