Apparatus

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sensors Mode-S transponder

88516B

ICAO 24-bit transponder address · allocated to Thailand

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

Hex
88516B
Octal
42050553
Decimal
8,933,739
Country
TH
Tail
HS-TKK
Type
B77W
No current signal · last broadcast 2h ago
Flights observed
205
Distinct callsigns
20
Country
TH
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S 88516B.

Country allocation

The ICAO 24-bit address 88516B 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
THA970 - 14 2026-07-09
THA682 Thai Airways International 14 2026-05-23
THA920 - 12 2026-07-11
THA683 Thai Airways International 12 2026-05-24
THA921 - 11 2026-07-12
THA971 - 10 2026-07-10
THA600 - 10 2026-07-11
THA931 - 9 2026-07-01
THA930 - 9 2026-06-30
THA917 - 9 2026-06-23
THA601 - 9 2026-07-11
THA639 Thai Airways International 8 2026-06-07
THA638 Thai Airways International 8 2026-06-07
THA916 - 7 2026-06-23
THA673 - 6 2026-06-15
THA672 - 6 2026-06-15
THA923 - 5 2026-07-13
THA922 - 5 2026-07-13
THA316 - 5 2026-06-22
THA315 - 5 2026-06-22

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 THA923 - Jul 13, 19:10 UTCJul 14, 05:20 UTC10h 10m
2026-07-13 THA922 - Jul 13, 05:55 UTCJul 13, 13:55 UTC8h 0m
2026-07-12 THA921 - Jul 12, 13:15 UTCJul 12, 23:10 UTC9h 55m
2026-07-11 THA920 - Jul 11, 17:20 UTCJul 11, 21:00 UTC3h 40m
2026-07-11 THA601 - Jul 11, 07:20 UTCJul 11, 07:30 UTC10m
2026-07-11 THA601 - Jul 11, 05:15 UTCJul 11, 05:25 UTC10m
2026-07-11 THA600 - Jul 11, 03:15 UTCJul 11, 03:35 UTC20m
2026-07-11 THA600 - Jul 11, 01:15 UTCJul 11, 01:35 UTC20m
2026-07-10 THA971 ZRH → BKK Jul 10, 11:55 UTCJul 10, 21:55 UTC10h 0m
2026-07-09 THA970 - Jul 9, 18:25 UTCJul 10, 05:35 UTC11h 10m
2026-07-09 THA601 - Jul 9, 07:20 UTCJul 9, 07:55 UTC35m
2026-07-09 THA601 - Jul 9, 05:35 UTCJul 9, 05:50 UTC15m
2026-07-09 THA600 - Jul 9, 03:30 UTCJul 9, 03:45 UTC15m
2026-07-09 THA600 - Jul 9, 01:25 UTCJul 9, 01:55 UTC30m
2026-07-08 THA661 HND → BKK Jul 8, 15:30 UTCJul 8, 21:00 UTC5h 30m
2026-07-08 THA660 - Jul 8, 06:20 UTCJul 8, 12:10 UTC5h 50m
2026-07-07 THA921 FRA → BKK Jul 7, 13:25 UTCJul 7, 23:30 UTC10h 5m
2026-07-06 THA920 - Jul 6, 17:05 UTCJul 7, 04:25 UTC11h 20m
2026-07-06 THA633 TPE → BKK Jul 6, 06:50 UTCJul 6, 09:55 UTC3h 5m
2026-07-06 THA632 - Jul 6, 01:50 UTCJul 6, 05:15 UTC3h 25m
2026-07-05 THA971 ZRH → BKK Jul 5, 12:50 UTCJul 5, 23:10 UTC10h 20m
2026-07-04 THA970 - Jul 4, 18:30 UTCJul 5, 05:30 UTC11h 0m
2026-07-04 THA635 TPE → BKK Jul 4, 11:20 UTCJul 4, 14:20 UTC3h 0m
2026-07-04 THA634 - Jul 4, 06:10 UTCJul 4, 09:30 UTC3h 20m
2026-07-03 THA921 - Jul 3, 13:05 UTCJul 3, 23:25 UTC10h 20m
2026-07-02 THA920 - Jul 2, 17:10 UTCJul 3, 04:10 UTC11h 0m
2026-07-02 THA432 - Jul 2, 03:10 UTCJul 2, 12:55 UTC9h 45m
2026-07-01 THA931 - Jul 1, 12:30 UTCJul 1, 23:10 UTC10h 40m
2026-06-30 THA930 - Jun 30, 17:35 UTCJun 30, 21:15 UTC3h 40m
2026-06-30 THA404 - Jun 30, 05:10 UTCJun 30, 07:00 UTC1h 50m
2026-06-30 THA403 - Jun 30, 01:35 UTCJun 30, 03:20 UTC1h 45m
2026-06-29 THA971 - Jun 29, 12:00 UTCJun 29, 22:19 UTC10h 20m
2026-06-28 THA970 - Jun 28, 18:25 UTCJun 29, 05:15 UTC10h 50m
2026-06-28 THA436 - Jun 28, 12:19 UTCJun 28, 15:14 UTC2h 55m
2026-06-28 THA435 - Jun 28, 07:50 UTCJun 28, 10:39 UTC2h 50m
2026-06-27 THA923 FRA → BKK Jun 27, 19:24 UTCJun 28, 05:29 UTC10h 5m
2026-06-27 THA922 - Jun 27, 05:44 UTCJun 27, 06:40 UTC55m
2026-06-26 THA931 - Jun 26, 12:29 UTCJun 26, 23:15 UTC10h 45m
2026-06-25 THA930 - Jun 25, 17:39 UTCJun 25, 18:34 UTC55m
2026-06-25 THA633 TPE → BKK Jun 25, 06:55 UTCJun 25, 10:04 UTC3h 10m
2026-06-25 THA632 - Jun 25, 01:40 UTCJun 25, 05:05 UTC3h 25m
2026-06-24 THA418 - Jun 24, 13:34 UTCJun 24, 15:14 UTC1h 40m
2026-06-24 THA417 - Jun 24, 09:59 UTCJun 24, 11:45 UTC1h 45m
2026-06-23 THA917 - Jun 23, 20:44 UTCJun 24, 07:54 UTC11h 10m
2026-06-23 THA916 - Jun 23, 06:24 UTCJun 23, 07:19 UTC55m
2026-06-22 THA316 - Jun 22, 18:19 UTCJun 22, 21:54 UTC3h 35m
2026-06-22 THA315 - Jun 22, 12:25 UTCJun 22, 15:54 UTC3h 30m
2026-06-21 THA917 - Jun 21, 20:50 UTCJun 22, 07:45 UTC10h 55m
2026-06-21 THA916 - Jun 21, 06:19 UTCJun 21, 07:20 UTC1h 0m
2026-06-20 THA316 - Jun 20, 18:34 UTCJun 20, 20:45 UTC2h 10m

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

Mode-S 88516B frequently asked

What is Mode-S code 88516B?
88516B is an ICAO 24-bit transponder address. Allocated to Thailand. Assigned to HS-TKK.
Where is Mode-S 88516B registered?
Mode-S code 88516B is allocated to Thailand (TH). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 88516B broadcasting right now?
No active broadcast right now. Last signal was 2h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 88516B, octal 42050553, decimal 8,933,739.
What flights does 88516B operate?
Mode-S 88516B has broadcast 20 distinct callsigns, including THA970, THA682, THA920, THA683, THA921.