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 2d ago
Flights observed
75
Distinct callsigns
20
Country
CR
Last broadcast
2d ago

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
NSE8720 SATENA 4 2026-05-27
NSE8766 SATENA 3 2026-05-30
NSE8743 SATENA 3 2026-05-28
NSE8742 - 3 2026-05-28
NSE8903 SATENA 2 2026-05-28
NSE8902 SATENA 2 2026-05-28
NSE8874 - 2 2026-05-18
NSE8733 SATENA 2 2026-05-31
NSE8732 SATENA 2 2026-05-31
NSE8726 SATENA 2 2026-05-29
NSE8725 SATENA 2 2026-05-29
NSE8724 SATENA 2 2026-05-27
NSE8715 SATENA 2 2026-05-15
NSE8712 SATENA 2 2026-05-15
NSE8711 SATENA 2 2026-05-17
NSE8686 SATENA 2 2026-05-18
NSE8685 SATENA 2 2026-05-17
NSE8658 SATENA 2 2026-05-16
NSE8624 SATENA 2 2026-05-25
NSE8607 SATENA 2 2026-05-29

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-31 NSE8733 PUU → BOG May 31, 17:25 UTCMay 31, 17:45 UTC20m
2026-05-31 NSE8732 BOG → PUU May 31, 14:40 UTCMay 31, 15:00 UTC20m
2026-05-30 NSE8766 EOH → BOG May 30, 20:35 UTCMay 30, 20:50 UTC15m
2026-05-30 NSE8899 APO → BOG May 30, 02:00 UTCMay 30, 02:25 UTC25m
2026-05-29 NSE8898 BOG → APO May 29, 23:40 UTCMay 30, 00:00 UTC20m
2026-05-29 NSE8726 BUN → BOG May 29, 22:25 UTCMay 29, 22:40 UTC15m
2026-05-29 NSE8725 BOG → BUN May 29, 20:15 UTCMay 29, 20:35 UTC20m
2026-05-29 NSE8607 EOH → BOG May 29, 17:55 UTCMay 29, 18:10 UTC15m
2026-05-29 NSE8009 PUU → BOG May 29, 02:40 UTCMay 29, 03:10 UTC30m
2026-05-29 NSE7704 BOG → PUU May 29, 00:00 UTCMay 29, 00:20 UTC20m
2026-05-28 NSE8743 VGZ → BOG May 28, 22:30 UTCMay 28, 22:55 UTC25m
2026-05-28 NSE8742 - May 28, 19:55 UTCMay 28, 20:15 UTC20m
2026-05-28 NSE8903 PTX → BOG May 28, 17:55 UTCMay 28, 18:10 UTC15m
2026-05-28 NSE8902 BOG → PTX May 28, 15:45 UTCMay 28, 16:05 UTC20m
2026-05-28 NSE8721 TCO → BOG May 28, 01:15 UTCMay 28, 01:30 UTC15m
2026-05-27 NSE8720 BOG → TCO May 27, 19:10 UTCMay 27, 19:25 UTC15m
2026-05-27 NSE8766 EOH → BOG May 27, 17:45 UTCMay 27, 18:00 UTC15m
2026-05-27 NSE8724 BOG → UIB May 27, 11:10 UTCMay 27, 11:30 UTC20m
2026-05-27 NSE8799 APO → BOG May 27, 03:14 UTCMay 27, 03:34 UTC20m
2026-05-26 NSE8752 BOG → RVE May 26, 16:35 UTCMay 26, 16:59 UTC25m
2026-05-26 NSE8726 BUN → BOG May 26, 15:09 UTCMay 26, 15:24 UTC15m
2026-05-26 NSE8725 BOG → BUN May 26, 13:00 UTCMay 26, 13:15 UTC15m
2026-05-26 NSE8601 EOH → BOG May 26, 11:20 UTCMay 26, 11:34 UTC15m
2026-05-25 NSE8625 SVI → NVA May 25, 15:50 UTCMay 25, 16:15 UTC25m
2026-05-25 NSE8624 NVA → SVI May 25, 14:05 UTCMay 25, 14:30 UTC25m
2026-05-22 NSE8624 NVA → SVI May 22, 17:15 UTCMay 22, 17:40 UTC25m
2026-05-20 NSE8602 BOG → EOH May 20, 11:10 UTCMay 20, 11:30 UTC20m
2026-05-19 NSE8743 VGZ → BOG May 19, 23:00 UTCMay 19, 23:20 UTC20m
2026-05-19 NSE8742 - May 19, 20:20 UTCMay 19, 20:35 UTC15m
2026-05-19 NSE8646 FLA → BOG May 19, 18:50 UTCMay 19, 19:10 UTC20m
2026-05-19 NSE8645 BOG → FLA May 19, 16:20 UTCMay 19, 16:35 UTC15m
2026-05-19 NSE8733 PUU → BOG May 19, 14:50 UTCMay 19, 15:15 UTC25m
2026-05-19 NSE8732 BOG → PUU May 19, 12:05 UTCMay 19, 12:25 UTC20m
2026-05-18 NSE8734 UIB → BOG May 18, 21:15 UTCMay 18, 21:30 UTC15m
2026-05-18 NSE8874 - May 18, 15:35 UTCMay 18, 15:55 UTC20m
2026-05-18 NSE8647 - May 18, 14:15 UTCMay 18, 14:30 UTC15m
2026-05-18 NSE8686 BOG → TCO May 18, 11:05 UTCMay 18, 11:25 UTC20m
2026-05-17 NSE8685 TCO → BOG May 17, 23:30 UTCMay 17, 23:45 UTC15m
2026-05-17 NSE8720 BOG → TCO May 17, 20:10 UTCMay 17, 20:30 UTC20m
2026-05-17 NSE6751 - May 17, 18:30 UTCMay 17, 18:45 UTC15m
2026-05-17 NSE6750 - May 17, 16:30 UTCMay 17, 16:50 UTC20m
2026-05-17 NSE8711 AUC → BOG May 17, 15:05 UTCMay 17, 15:31 UTC25m
2026-05-17 NSE8710 BOG → AUC May 17, 12:25 UTCMay 17, 12:45 UTC20m
2026-05-16 NSE8766 EOH → BOG May 16, 20:45 UTCMay 16, 21:10 UTC25m
2026-05-16 NSE8724 BOG → UIB May 16, 12:01 UTCMay 16, 12:21 UTC20m
2026-05-16 NSE8659 PUU → BOG May 16, 02:55 UTCMay 16, 03:15 UTC20m
2026-05-16 NSE8658 BOG → PUU May 16, 00:10 UTCMay 16, 00:25 UTC15m
2026-05-15 NSE8715 AUC → BOG May 15, 22:35 UTCMay 15, 23:10 UTC35m
2026-05-15 NSE8712 BOG → AUC May 15, 20:00 UTCMay 15, 20:15 UTC15m
2026-05-15 NSE8607 EOH → BOG May 15, 18:30 UTCMay 15, 18:50 UTC20m

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 2d ago.
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 NSE8720, NSE8766, NSE8743, NSE8742, NSE8903.