Apparatus

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sensors Mode-S transponder

88516D

ICAO 24-bit transponder address · allocated to Thailand

Currently assigned to HS-TKM · BOEING 777-300ER

Hex
88516D
Octal
42050555
Decimal
8,933,741
Country
TH
Tail
HS-TKM
Type
B77W
No current signal · last broadcast Jul 26, 21:10 UTC
Flights observed
250
Distinct callsigns
20
Country
TH
Last broadcast
Jul 26, 21:10 UTC

Last known position

Most recent position reported by Mode-S 88516D.

Country allocation

The ICAO 24-bit address 88516D 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
THA639 Thai Airways International 16 2026-07-26
THA931 Thai Airways International 15 2026-07-25
THA920 Thai Airways International 15 2026-07-18
THA638 Thai Airways International 14 2026-07-26
THA930 Thai Airways International 13 2026-07-24
THA921 Thai Airways International 12 2026-07-19
THA601 - 12 2026-07-07
THA600 - 12 2026-07-07
THA971 - 11 2026-07-08
THA950 Thai Airways International 11 2026-07-21
THA970 - 10 2026-07-07
THA922 Thai Airways International 10 2026-07-23
THA673 - 10 2026-06-17
THA951 Thai Airways International 9 2026-07-22
THA923 Thai Airways International 9 2026-07-23
THA683 - 9 2026-07-03
THA682 - 9 2026-07-02
THA917 Thai Airways International 7 2026-07-20
THA916 Thai Airways International 6 2026-07-20
THA672 - 5 2026-06-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 THA622 BKK → KIX Jul 26, 17:55 UTCJul 26, 21:10 UTC3h 15m
2026-07-26 THA639 HKG → BKK Jul 26, 13:35 UTCJul 26, 14:10 UTC35m
2026-07-26 THA639 HKG → BKK Jul 26, 11:45 UTCJul 26, 11:55 UTC10m
2026-07-26 THA638 BKK → HKG Jul 26, 09:25 UTCJul 26, 09:35 UTC10m
2026-07-26 THA638 BKK → HKG Jul 26, 07:20 UTCJul 26, 07:40 UTC20m
2026-07-25 THA931 CDG → BKK Jul 25, 12:05 UTCJul 25, 22:55 UTC10h 50m
2026-07-24 THA930 BKK → CDG Jul 24, 17:45 UTCJul 25, 05:20 UTC11h 35m
2026-07-24 THA639 HKG → BKK Jul 24, 13:30 UTCJul 24, 14:05 UTC35m
2026-07-24 THA639 HKG → BKK Jul 24, 11:50 UTCJul 24, 12:00 UTC10m
2026-07-24 THA638 BKK → HKG Jul 24, 09:30 UTCJul 24, 09:50 UTC20m
2026-07-24 THA638 BKK → HKG Jul 24, 07:30 UTCJul 24, 07:55 UTC25m
2026-07-23 THA923 FRA → BKK Jul 23, 19:15 UTCJul 24, 05:35 UTC10h 20m
2026-07-23 THA922 BKK → FRA Jul 23, 05:45 UTCJul 23, 16:45 UTC11h 0m
2026-07-22 THA951 CPH → BKK Jul 22, 12:50 UTCJul 22, 22:55 UTC10h 5m
2026-07-21 THA950 BKK → CPH Jul 21, 18:35 UTCJul 21, 19:45 UTC1h 10m
2026-07-20 THA917 LHR → BKK Jul 20, 20:50 UTCJul 21, 07:45 UTC10h 55m
2026-07-20 THA916 BKK → LHR Jul 20, 06:10 UTCJul 20, 18:15 UTC12h 5m
2026-07-19 THA921 FRA → BKK Jul 19, 14:05 UTCJul 20, 00:20 UTC10h 15m
2026-07-18 THA920 BKK → FRA Jul 18, 17:10 UTCJul 18, 18:20 UTC1h 10m
2026-07-18 THA639 HKG → BKK Jul 18, 13:40 UTCJul 18, 13:55 UTC15m
2026-07-18 THA639 HKG → BKK Jul 18, 11:40 UTCJul 18, 11:55 UTC15m
2026-07-18 THA638 - Jul 18, 09:45 UTCJul 18, 10:05 UTC20m
2026-07-18 THA638 - Jul 18, 07:40 UTCJul 18, 07:50 UTC10m
2026-07-17 THA923 FRA → BKK Jul 17, 19:30 UTCJul 18, 05:40 UTC10h 11m
2026-07-17 THA922 - Jul 17, 05:55 UTCJul 17, 16:55 UTC11h 0m
2026-07-16 THA921 FRA → BKK Jul 16, 13:15 UTCJul 16, 23:29 UTC10h 15m
2026-07-15 THA920 - Jul 15, 17:10 UTCJul 15, 18:10 UTC1h 0m
2026-07-15 THA639 - Jul 15, 14:10 UTCJul 15, 14:35 UTC25m
2026-07-15 THA639 - Jul 15, 12:15 UTCJul 15, 12:30 UTC15m
2026-07-15 THA638 - Jul 15, 09:45 UTCJul 15, 10:05 UTC20m
2026-07-15 THA638 - Jul 15, 07:25 UTCJul 15, 07:35 UTC10m
2026-07-14 THA923 - Jul 14, 19:00 UTCJul 15, 05:20 UTC10h 19m
2026-07-14 THA922 - Jul 14, 05:35 UTCJul 14, 16:50 UTC11h 15m
2026-07-13 THA931 - Jul 13, 12:05 UTCJul 13, 22:35 UTC10h 30m
2026-07-12 THA930 - Jul 12, 17:30 UTCJul 12, 21:10 UTC3h 40m
2026-07-12 THA639 - Jul 12, 13:45 UTCJul 12, 14:05 UTC20m
2026-07-12 THA639 - Jul 12, 11:45 UTCJul 12, 11:55 UTC10m
2026-07-12 THA638 - Jul 12, 09:40 UTCJul 12, 10:01 UTC20m
2026-07-11 THA923 - Jul 11, 19:40 UTCJul 12, 05:25 UTC9h 45m
2026-07-11 THA922 - Jul 11, 05:45 UTCJul 11, 07:00 UTC1h 15m
2026-07-10 THA951 CPH → BKK Jul 10, 14:05 UTCJul 10, 23:50 UTC9h 46m
2026-07-09 THA950 - Jul 9, 18:35 UTCJul 10, 05:50 UTC11h 15m
2026-07-08 THA971 ZRH → BKK Jul 8, 12:00 UTCJul 8, 22:05 UTC10h 5m
2026-07-07 THA970 - Jul 7, 18:25 UTCJul 8, 02:35 UTC8h 10m
2026-07-07 THA601 - Jul 7, 07:30 UTCJul 7, 08:15 UTC45m
2026-07-07 THA601 - Jul 7, 05:45 UTCJul 7, 05:55 UTC10m
2026-07-07 THA600 - Jul 7, 03:30 UTCJul 7, 03:50 UTC20m
2026-07-07 THA600 - Jul 7, 01:20 UTCJul 7, 01:50 UTC30m
2026-07-06 THA931 - Jul 6, 12:05 UTCJul 6, 22:40 UTC10h 35m
2026-07-05 THA930 - Jul 5, 17:35 UTCJul 6, 05:10 UTC11h 35m

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-TKM page for operator, model, and routing details .

Mode-S 88516D frequently asked

What is Mode-S code 88516D?
88516D is an ICAO 24-bit transponder address. Allocated to Thailand. Assigned to HS-TKM.
Where is Mode-S 88516D registered?
Mode-S code 88516D is allocated to Thailand (TH). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 88516D broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:10 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 88516D, octal 42050555, decimal 8,933,741.
What flights does 88516D operate?
Mode-S 88516D has broadcast 20 distinct callsigns, including THA639, THA931, THA920, THA638, THA930.