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 2h ago
Flights observed
175
Distinct callsigns
20
Country
CR
Last broadcast
2h 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
NSE8766 - 7 2026-07-10
NSE8720 - 6 2026-07-12
NSE8605 - 6 2026-07-14
NSE7717 - 6 2026-07-14
NSE8874 - 5 2026-06-19
NSE8685 - 5 2026-07-12
NSE7716 - 5 2026-07-16
NSE8898 - 4 2026-06-19
NSE8724 SATENA 4 2026-06-17
NSE8686 - 4 2026-06-18
NSE8680 SATENA 4 2026-07-16
NSE8624 - 4 2026-07-13
NSE8009 - 4 2026-07-15
NSE8903 - 3 2026-07-17
NSE8902 - 3 2026-07-17
NSE8899 - 3 2026-06-20
NSE8892 - 3 2026-07-13
NSE8743 SATENA 3 2026-05-28
NSE8742 - 3 2026-05-28
NSE8726 SATENA 3 2026-06-05

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
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
2026-07-16 NSE8680 EOH → UIB Jul 16, 19:35 UTCJul 16, 19:50 UTC15m
2026-07-16 NSE7716 - Jul 16, 17:20 UTCJul 16, 17:30 UTC10m
2026-07-16 NSE8875 - Jul 16, 16:25 UTCJul 16, 16:30 UTC5m
2026-07-15 NSE8009 - Jul 15, 20:15 UTCJul 15, 20:40 UTC25m
2026-07-15 NSE8658 - Jul 15, 15:00 UTCJul 15, 15:20 UTC20m
2026-07-14 NSE8605 EOH → BOG Jul 14, 21:05 UTCJul 14, 21:50 UTC45m
2026-07-14 NSE8692 - Jul 14, 18:10 UTCJul 14, 18:20 UTC10m
2026-07-14 NSE7717 - Jul 14, 17:25 UTCJul 14, 17:35 UTC10m
2026-07-14 NSE7716 - Jul 14, 15:10 UTCJul 14, 15:20 UTC10m
2026-07-13 NSE8605 - Jul 13, 19:45 UTCJul 13, 20:05 UTC20m
2026-07-13 NSE8893 - Jul 13, 18:45 UTCJul 13, 19:05 UTC20m
2026-07-13 NSE8892 - Jul 13, 16:25 UTCJul 13, 16:35 UTC10m
2026-07-13 NSE8625 - Jul 13, 15:05 UTCJul 13, 15:50 UTC45m
2026-07-13 NSE8624 - Jul 13, 12:55 UTCJul 13, 13:50 UTC55m
2026-07-13 NSE8604 BOG → EOH Jul 13, 11:30 UTCJul 13, 12:05 UTC35m
2026-07-12 NSE8685 - Jul 12, 23:15 UTCJul 12, 23:30 UTC15m
2026-07-12 NSE8720 - Jul 12, 20:10 UTCJul 12, 20:40 UTC30m
2026-07-12 NSE8779 - Jul 12, 17:25 UTCJul 12, 17:45 UTC20m
2026-07-12 NSE8778 - Jul 12, 15:05 UTCJul 12, 15:30 UTC25m
2026-07-12 NSE8711 - Jul 12, 13:50 UTCJul 12, 14:10 UTC20m
2026-07-12 NSE8710 - Jul 12, 11:10 UTCJul 12, 11:30 UTC20m
2026-07-11 NSE8729 - Jul 11, 23:10 UTCJul 11, 23:40 UTC30m
2026-07-11 NSE8680 - Jul 11, 21:15 UTCJul 11, 21:25 UTC10m
2026-07-11 NSE7717 - Jul 11, 18:20 UTCJul 11, 18:30 UTC10m
2026-07-11 NSE7716 - Jul 11, 16:05 UTCJul 11, 16:15 UTC10m
2026-07-11 NSE8767 BOG → EOH Jul 11, 14:30 UTCJul 11, 15:10 UTC40m
2026-07-10 NSE8766 - Jul 10, 18:40 UTCJul 10, 18:55 UTC15m
2026-07-10 NSE8730 - Jul 10, 15:55 UTCJul 10, 16:05 UTC10m
2026-07-10 NSE8892 - Jul 10, 14:50 UTCJul 10, 15:00 UTC10m
2026-07-10 NSE8892 - Jul 10, 12:45 UTCJul 10, 13:00 UTC15m
2026-07-10 NSE8602 - Jul 10, 11:10 UTCJul 10, 11:50 UTC40m
2026-07-09 NSE8794 - Jul 9, 22:25 UTCJul 9, 22:55 UTC30m
2026-07-09 NSE8680 - Jul 9, 20:50 UTCJul 9, 20:55 UTC5m
2026-07-09 NSE7717 - Jul 9, 19:25 UTCJul 9, 19:40 UTC15m
2026-07-09 NSE8875 - Jul 9, 16:25 UTCJul 9, 16:35 UTC10m
2026-07-09 NSE8793 - Jul 9, 14:20 UTCJul 9, 14:35 UTC15m
2026-07-08 NSE8009 - Jul 8, 23:00 UTCJul 8, 23:30 UTC30m
2026-07-07 NSE8633 - Jul 7, 17:35 UTCJul 7, 17:55 UTC20m
2026-07-07 NSE8632 - Jul 7, 15:45 UTCJul 7, 16:00 UTC15m
2026-07-07 NSE8771 - Jul 7, 14:20 UTCJul 7, 14:35 UTC15m
2026-07-06 NSE8605 - Jul 6, 20:15 UTCJul 6, 20:35 UTC20m
2026-06-20 NSE8899 - Jun 20, 01:29 UTCJun 20, 01:44 UTC15m
2026-06-19 NSE8898 - Jun 19, 23:49 UTCJun 19, 23:59 UTC10m
2026-06-19 NSE8725 BOG → BUN Jun 19, 19:45 UTCJun 19, 20:04 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 2h 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 NSE8766, NSE8720, NSE8605, NSE7717, NSE8874.