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sensors Mode-S transponder

88516C

ICAO 24-bit transponder address · allocated to Thailand

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

Hex
88516C
Octal
42050554
Decimal
8,933,740
Country
TH
Tail
HS-TKL
Type
B77W
No current signal · last broadcast Jul 26, 23:00 UTC
Flights observed
241
Distinct callsigns
20
Country
TH
Last broadcast
Jul 26, 23:00 UTC

Last known position

Most recent position reported by Mode-S 88516C.

Country allocation

The ICAO 24-bit address 88516C 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
THA951 Thai Airways International 16 2026-07-21
THA917 Thai Airways International 16 2026-07-24
THA950 Thai Airways International 15 2026-07-20
THA923 Thai Airways International 13 2026-07-16
THA916 Thai Airways International 13 2026-07-24
THA922 - 12 2026-07-16
THA920 Thai Airways International 12 2026-07-25
THA638 - 12 2026-07-17
THA921 Thai Airways International 11 2026-07-26
THA601 - 11 2026-07-04
THA600 - 11 2026-07-04
THA639 Thai Airways International 10 2026-07-17
THA683 - 9 2026-07-12
THA682 - 9 2026-07-11
THA673 - 7 2026-06-27
THA672 - 7 2026-06-27
THA971 - 6 2026-07-13
THA970 - 6 2026-07-12
THA931 - 6 2026-06-19
THA315 Thai Airways International 6 2026-05-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 THA921 FRA → BKK Jul 26, 13:15 UTCJul 26, 23:00 UTC9h 45m
2026-07-25 THA920 BKK → FRA Jul 25, 17:25 UTCJul 26, 04:05 UTC10h 40m
2026-07-24 THA917 LHR → BKK Jul 24, 20:55 UTCJul 25, 07:40 UTC10h 45m
2026-07-24 THA916 BKK → LHR Jul 24, 09:05 UTCJul 24, 18:05 UTC9h 0m
2026-07-24 THA916 BKK → LHR Jul 24, 06:15 UTCJul 24, 08:35 UTC2h 20m
2026-07-23 THA921 FRA → BKK Jul 23, 13:15 UTCJul 23, 23:20 UTC10h 5m
2026-07-23 THA920 BKK → FRA Jul 23, 03:50 UTCJul 23, 04:15 UTC25m
2026-07-22 THA920 BKK → FRA Jul 22, 17:10 UTCJul 22, 20:55 UTC3h 45m
2026-07-21 THA951 CPH → BKK Jul 21, 12:40 UTCJul 21, 22:55 UTC10h 15m
2026-07-20 THA950 BKK → CPH Jul 20, 19:35 UTCJul 20, 20:40 UTC1h 5m
2026-07-19 THA917 LHR → BKK Jul 19, 20:50 UTCJul 20, 07:20 UTC10h 30m
2026-07-19 THA916 BKK → LHR Jul 19, 06:10 UTCJul 19, 07:20 UTC1h 10m
2026-07-18 THA921 FRA → BKK Jul 18, 13:00 UTCJul 18, 23:20 UTC10h 20m
2026-07-17 THA920 BKK → FRA Jul 17, 17:05 UTCJul 18, 03:50 UTC10h 46m
2026-07-17 THA639 HKG → BKK Jul 17, 13:45 UTCJul 17, 14:00 UTC15m
2026-07-17 THA639 HKG → BKK Jul 17, 11:45 UTCJul 17, 11:55 UTC10m
2026-07-17 THA638 - Jul 17, 09:35 UTCJul 17, 09:55 UTC20m
2026-07-17 THA638 - Jul 17, 07:25 UTCJul 17, 07:35 UTC10m
2026-07-16 THA923 FRA → BKK Jul 16, 19:14 UTCJul 17, 05:39 UTC10h 25m
2026-07-16 THA922 - Jul 16, 05:45 UTCJul 16, 16:44 UTC11h 0m
2026-07-15 THA921 - Jul 15, 13:05 UTCJul 15, 23:30 UTC10h 25m
2026-07-14 THA920 - Jul 14, 17:10 UTCJul 15, 04:20 UTC11h 9m
2026-07-14 THA633 - Jul 14, 09:55 UTCJul 14, 10:35 UTC40m
2026-07-14 THA633 - Jul 14, 07:05 UTCJul 14, 07:55 UTC50m
2026-07-14 THA632 - Jul 14, 04:00 UTCJul 14, 05:05 UTC1h 5m
2026-07-14 THA632 - Jul 14, 01:50 UTCJul 14, 02:00 UTC10m
2026-07-13 THA971 - Jul 13, 11:50 UTCJul 13, 22:00 UTC10h 10m
2026-07-12 THA970 - Jul 12, 18:25 UTCJul 13, 02:35 UTC8h 10m
2026-07-12 THA410 - Jul 12, 14:55 UTCJul 12, 15:20 UTC25m
2026-07-12 THA410 - Jul 12, 13:20 UTCJul 12, 13:45 UTC25m
2026-07-12 THA409 - Jul 12, 11:01 UTCJul 12, 11:50 UTC50m
2026-07-12 THA409 - Jul 12, 09:55 UTCJul 12, 10:20 UTC25m
2026-07-12 THA683 - Jul 12, 06:55 UTCJul 12, 07:15 UTC20m
2026-07-12 THA683 - Jul 12, 01:40 UTCJul 12, 04:30 UTC2h 50m
2026-07-11 THA682 - Jul 11, 18:40 UTCJul 11, 21:55 UTC3h 15m
2026-07-11 THA682 - Jul 11, 16:00 UTCJul 11, 16:10 UTC10m
2026-07-10 THA346 - Jul 10, 19:30 UTCJul 10, 23:40 UTC4h 10m
2026-07-10 THA345 BKK → LHE Jul 10, 13:15 UTCJul 10, 15:40 UTC2h 25m
2026-07-10 THA633 - Jul 10, 06:50 UTCJul 10, 10:00 UTC3h 10m
2026-07-10 THA632 - Jul 10, 01:55 UTCJul 10, 05:10 UTC3h 15m
2026-07-09 THA921 - Jul 9, 13:05 UTCJul 9, 23:10 UTC10h 5m
2026-07-08 THA920 - Jul 8, 17:10 UTCJul 9, 04:15 UTC11h 5m
2026-07-08 THA639 - Jul 8, 13:35 UTCJul 8, 14:40 UTC1h 5m
2026-07-08 THA639 - Jul 8, 11:55 UTCJul 8, 12:05 UTC10m
2026-07-08 THA638 - Jul 8, 09:40 UTCJul 8, 09:55 UTC15m
2026-07-08 THA638 - Jul 8, 07:20 UTCJul 8, 07:45 UTC25m
2026-07-07 THA923 - Jul 7, 19:10 UTCJul 8, 05:20 UTC10h 10m
2026-07-07 THA922 - Jul 7, 05:50 UTCJul 7, 17:05 UTC11h 15m
2026-07-06 THA661 HND → BKK Jul 6, 15:20 UTCJul 6, 20:55 UTC5h 35m
2026-07-06 THA660 - Jul 6, 06:20 UTCJul 6, 12:00 UTC5h 40m

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

Mode-S 88516C frequently asked

What is Mode-S code 88516C?
88516C is an ICAO 24-bit transponder address. Allocated to Thailand. Assigned to HS-TKL.
Where is Mode-S 88516C registered?
Mode-S code 88516C is allocated to Thailand (TH). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 88516C broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 23:00 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 88516C, octal 42050554, decimal 8,933,740.
What flights does 88516C operate?
Mode-S 88516C has broadcast 20 distinct callsigns, including THA951, THA917, THA950, THA923, THA916.