Apparatus

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sensors Mode-S transponder

0AC19A

ICAO 24-bit transponder address · allocated to Costa Rica

Currently assigned to HK-4979 · ATR-42-500

Hex
0AC19A
Octal
02540632
Decimal
704,922
Country
CR
Tail
HK-4979
Type
AT45
No current signal · last broadcast Jul 26, 21:50 UTC
Flights observed
219
Distinct callsigns
20
Country
CR
Last broadcast
Jul 26, 21:50 UTC

Last known position

Most recent position reported by Mode-S 0AC19A.

Country allocation

The ICAO 24-bit address 0AC19A falls within the block assigned to Costa Rica (CR) by ICAO Annex 10, Volume III. Every aircraft registered in Costa Rica 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
NSE8605 SATENA 9 2026-07-24
NSE7717 - 8 2026-07-25
NSE8874 - 7 2026-07-24
NSE8766 - 7 2026-07-10
NSE8898 SATENA 6 2026-07-24
NSE8720 - 6 2026-07-12
NSE8009 SATENA 6 2026-07-22
NSE7716 - 6 2026-07-25
NSE8899 SATENA 5 2026-07-25
NSE8743 SATENA 5 2026-07-26
NSE8742 - 5 2026-07-26
NSE8686 SATENA 5 2026-07-23
NSE8685 - 5 2026-07-12
NSE8680 SATENA 5 2026-07-25
NSE8658 SATENA 5 2026-07-22
NSE8624 SATENA 5 2026-07-24
NSE8607 SATENA 5 2026-07-26
NSE8724 SATENA 4 2026-06-17
NSE8711 - 4 2026-07-22
NSE8625 SATENA 4 2026-07-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 NSE8607 EOH → BOG Jul 26, 21:05 UTCJul 26, 21:50 UTC45m
2026-07-26 NSE8607 EOH → BOG Jul 26, 20:05 UTCJul 26, 20:15 UTC10m
2026-07-26 NSE8664 EOH → APO Jul 26, 18:35 UTCJul 26, 18:40 UTC5m
2026-07-26 NSE8606 BOG → EOH Jul 26, 17:05 UTCJul 26, 17:40 UTC35m
2026-07-26 NSE8743 VGZ → BOG Jul 26, 14:30 UTCJul 26, 14:45 UTC15m
2026-07-26 NSE8742 - Jul 26, 11:30 UTCJul 26, 11:55 UTC25m
2026-07-25 NSE8729 UIB → BOG Jul 25, 23:20 UTCJul 26, 00:00 UTC40m
2026-07-25 NSE8680 EOH → UIB Jul 25, 21:15 UTCJul 25, 21:25 UTC10m
2026-07-25 NSE7717 - Jul 25, 18:00 UTCJul 25, 18:40 UTC40m
2026-07-25 NSE7716 - Jul 25, 16:20 UTCJul 25, 17:00 UTC40m
2026-07-25 NSE8767 BOG → EOH Jul 25, 14:55 UTCJul 25, 15:35 UTC40m
2026-07-25 NSE8899 APO → BOG Jul 25, 02:05 UTCJul 25, 02:45 UTC40m
2026-07-24 NSE8898 BOG → APO Jul 24, 23:50 UTCJul 25, 00:30 UTC40m
2026-07-24 NSE8605 EOH → BOG Jul 24, 21:10 UTCJul 24, 22:00 UTC50m
2026-07-24 NSE8625 SVI → NVA Jul 24, 19:50 UTCJul 24, 20:30 UTC40m
2026-07-24 NSE8624 NVA → SVI Jul 24, 17:45 UTCJul 24, 18:35 UTC50m
2026-07-24 NSE7717 - Jul 24, 16:30 UTCJul 24, 17:10 UTC40m
2026-07-24 NSE8874 - Jul 24, 15:25 UTCJul 24, 15:35 UTC10m
2026-07-24 NSE8874 - Jul 24, 14:30 UTCJul 24, 14:45 UTC15m
2026-07-23 NSE8686 BOG → TCO Jul 23, 21:15 UTCJul 23, 21:40 UTC25m
2026-07-23 NSE8646 FLA → BOG Jul 23, 19:25 UTCJul 23, 20:00 UTC35m
2026-07-23 NSE8645 BOG → FLA Jul 23, 17:00 UTCJul 23, 17:20 UTC20m
2026-07-23 NSE8659 PUU → BOG Jul 23, 15:10 UTCJul 23, 15:30 UTC20m
2026-07-22 NSE8009 PUU → BOG Jul 22, 20:20 UTCJul 22, 20:45 UTC25m
2026-07-22 NSE8658 BOG → PUU Jul 22, 15:05 UTCJul 22, 15:25 UTC20m
2026-07-22 NSE8711 - Jul 22, 13:25 UTCJul 22, 13:45 UTC20m
2026-07-21 NSE8605 EOH → BOG Jul 21, 21:05 UTCJul 21, 21:50 UTC45m
2026-07-21 NSE8605 EOH → BOG Jul 21, 20:05 UTCJul 21, 20:10 UTC5m
2026-07-21 NSE8692 EOH → BSC Jul 21, 18:20 UTCJul 21, 18:30 UTC10m
2026-07-21 NSE8692 EOH → BSC Jul 21, 17:30 UTCJul 21, 17:40 UTC10m
2026-07-21 NSE8671 UIB → EOH Jul 21, 14:25 UTCJul 21, 14:35 UTC10m
2026-07-21 NSE8793 BOG → UIB Jul 21, 12:40 UTCJul 21, 13:15 UTC35m
2026-07-21 NSE8669 PUU → BOG Jul 21, 03:05 UTCJul 21, 03:25 UTC20m
2026-07-21 NSE8658 BOG → PUU Jul 21, 00:15 UTCJul 21, 00:30 UTC15m
2026-07-20 NSE8879 EOH → BOG Jul 20, 22:15 UTCJul 20, 23:05 UTC50m
2026-07-20 NSE8616 BOG → EOH Jul 20, 20:45 UTCJul 20, 21:30 UTC45m
2026-07-20 NSE8741 - Jul 20, 18:30 UTCJul 20, 19:05 UTC35m
2026-07-20 NSE8740 - Jul 20, 12:40 UTCJul 20, 13:00 UTC20m
2026-07-19 NSE8899 - Jul 19, 18:10 UTCJul 19, 18:50 UTC40m
2026-07-19 NSE8898 - Jul 19, 16:00 UTCJul 19, 16:40 UTC40m
2026-07-19 NSE8743 - Jul 19, 14:35 UTCJul 19, 14:55 UTC20m
2026-07-19 NSE8742 - Jul 19, 11:35 UTCJul 19, 11:55 UTC20m
2026-07-18 NSE8009 PUU → BOG Jul 18, 23:45 UTCJul 19, 00:10 UTC25m
2026-07-18 NSE7704 - Jul 18, 21:00 UTCJul 18, 21:20 UTC20m
2026-07-17 NSE8715 - Jul 17, 23:30 UTCJul 18, 00:00 UTC30m
2026-07-17 NSE8712 BOG → AUC Jul 17, 18:00 UTCJul 17, 18:19 UTC20m
2026-07-17 NSE8903 - Jul 17, 16:34 UTCJul 17, 16:59 UTC25m
2026-07-17 NSE8902 - Jul 17, 14:20 UTCJul 17, 14:44 UTC25m
2026-07-16 NSE8794 - Jul 16, 22:30 UTCJul 16, 23:05 UTC35m
2026-07-16 NSE8680 EOH → UIB Jul 16, 21:05 UTCJul 16, 21:15 UTC10m

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 HK-4979 page for operator, model, and routing details .

Mode-S 0AC19A frequently asked

What is Mode-S code 0AC19A?
0AC19A is an ICAO 24-bit transponder address. Allocated to Costa Rica. Assigned to HK-4979.
Where is Mode-S 0AC19A registered?
Mode-S code 0AC19A is allocated to Costa Rica (CR). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is 0AC19A broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:50 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 0AC19A, octal 02540632, decimal 704,922.
What flights does 0AC19A operate?
Mode-S 0AC19A has broadcast 20 distinct callsigns, including NSE8605, NSE7717, NSE8874, NSE8766, NSE8898.