Apparatus

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sensors Mode-S transponder

0ACB39

ICAO 24-bit transponder address · allocated to Costa Rica

Currently assigned to HK-5439

Hex
0ACB39
Octal
02545471
Decimal
707,385
Country
CR
Tail
HK-5439
Type
B733
No current signal · last broadcast 2d ago
Flights observed
106
Distinct callsigns
20
Country
CR
Last broadcast
2d ago

Last known position

Most recent position reported by Mode-S 0ACB39.

Country allocation

The ICAO 24-bit address 0ACB39 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
KRE140 - 9 2026-07-11
KRE2141 - 8 2026-06-11
KRE2140 - 7 2026-06-11
KRE155 - 7 2026-07-04
KRE154 - 7 2026-06-03
KRE141 - 7 2026-06-19
KRE151 - 5 2026-07-09
KRE147 - 5 2026-05-28
KRE157 - 4 2026-06-19
KRE156 - 4 2026-07-10
KRE149 - 4 2026-07-11
KRE146 - 4 2026-07-09
KRE185 - 3 2026-07-11
KRE145 - 3 2026-07-07
KRE142 - 3 2026-07-09
KRE2155 - 2 2026-06-07
KRE2145 - 2 2026-07-07
KRE2144 - 2 2026-07-07
KRE191 - 2 2026-05-26
KRE190 - 2 2026-05-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-11 KRE149 - Jul 11, 21:55 UTCJul 11, 22:15 UTC20m
2026-07-11 KRE185 - Jul 11, 14:50 UTCJul 11, 15:05 UTC15m
2026-07-11 KRE185 - Jul 11, 13:45 UTCJul 11, 13:55 UTC10m
2026-07-11 KRE184 - Jul 11, 10:45 UTCJul 11, 12:00 UTC1h 15m
2026-07-11 KRE140 - Jul 11, 04:50 UTCJul 11, 05:10 UTC20m
2026-07-10 KRE156 - Jul 10, 11:45 UTCJul 10, 15:40 UTC3h 55m
2026-07-09 KRE143 LET → BOG Jul 9, 23:40 UTCJul 10, 01:20 UTC1h 40m
2026-07-09 KRE142 - Jul 9, 20:30 UTCJul 9, 22:00 UTC1h 30m
2026-07-09 KRE151 - Jul 9, 12:30 UTCJul 9, 16:05 UTC3h 35m
2026-07-09 KRE146 - Jul 9, 07:20 UTCJul 9, 07:35 UTC15m
2026-07-07 KRE2145 - Jul 7, 09:15 UTCJul 7, 09:25 UTC10m
2026-07-07 KRE2144 - Jul 7, 07:45 UTCJul 7, 07:55 UTC10m
2026-07-07 KRE145 - Jul 7, 06:05 UTCJul 7, 06:20 UTC15m
2026-07-05 KRE3143 LET → MIX Jul 5, 16:30 UTCJul 5, 17:05 UTC35m
2026-07-05 KRE142 - Jul 5, 15:10 UTCJul 5, 15:45 UTC35m
2026-07-04 KRE185 - Jul 4, 14:15 UTCJul 4, 14:30 UTC15m
2026-07-04 KRE155 - Jul 4, 00:10 UTCJul 4, 00:20 UTC10m
2026-06-24 KRE155 - Jun 24, 15:29 UTCJun 24, 15:39 UTC10m
2026-06-19 KRE157 - Jun 19, 11:49 UTCJun 19, 16:09 UTC4h 20m
2026-06-19 KRE141 - Jun 19, 07:59 UTCJun 19, 08:09 UTC10m
2026-06-19 KRE140 - Jun 19, 04:54 UTCJun 19, 05:14 UTC20m
2026-06-17 KRE140 - Jun 17, 06:15 UTCJun 17, 06:25 UTC10m
2026-06-11 KRE2141 - Jun 11, 10:00 UTCJun 11, 10:15 UTC15m
2026-06-11 KRE2140 - Jun 11, 07:15 UTCJun 11, 07:25 UTC10m
2026-06-10 KRE2141 - Jun 10, 12:40 UTCJun 10, 12:55 UTC15m
2026-06-10 KRE2140 - Jun 10, 10:05 UTCJun 10, 10:15 UTC10m
2026-06-10 KRE141 - Jun 10, 07:55 UTCJun 10, 08:10 UTC15m
2026-06-10 KRE140 - Jun 10, 05:15 UTCJun 10, 05:25 UTC10m
2026-06-07 KRE2155 - Jun 7, 02:19 UTCJun 7, 02:40 UTC20m
2026-06-07 KRE2155 - Jun 7, 01:00 UTCJun 7, 01:09 UTC10m
2026-06-06 KRE2154 - Jun 6, 18:25 UTCJun 6, 18:45 UTC20m
2026-06-06 KRE2145 - Jun 6, 06:00 UTCJun 6, 06:15 UTC15m
2026-06-06 KRE2144 - Jun 6, 04:10 UTCJun 6, 04:25 UTC15m
2026-06-05 KRE156 - Jun 5, 13:00 UTCJun 5, 16:30 UTC3h 30m
2026-06-05 KRE2147 - Jun 5, 09:25 UTCJun 5, 09:35 UTC10m
2026-06-05 KRE2146 - Jun 5, 07:35 UTCJun 5, 07:50 UTC15m
2026-06-04 KRE155 - Jun 4, 01:10 UTCJun 4, 01:30 UTC20m
2026-06-03 KRE154 - Jun 3, 21:35 UTCJun 3, 21:45 UTC10m
2026-06-03 KRE154 - Jun 3, 20:00 UTCJun 3, 20:20 UTC20m
2026-06-03 KRE2141 - Jun 3, 12:05 UTCJun 3, 12:20 UTC15m
2026-06-03 KRE141 - Jun 3, 07:45 UTCJun 3, 08:00 UTC15m
2026-06-03 KRE140 - Jun 3, 04:55 UTCJun 3, 05:05 UTC10m
2026-06-02 KRE173 - Jun 2, 20:25 UTCJun 3, 00:20 UTC3h 55m
2026-05-30 KRE149 - May 30, 14:40 UTCMay 30, 18:15 UTC3h 35m
2026-05-30 KRE145 - May 30, 05:35 UTCMay 30, 05:55 UTC20m
2026-05-30 KRE144 - May 30, 03:55 UTCMay 30, 04:05 UTC10m
2026-05-29 KRE157 - May 29, 16:00 UTCMay 29, 16:25 UTC25m
2026-05-28 KRE151 - May 28, 15:35 UTCMay 28, 16:05 UTC30m
2026-05-28 KRE147 - May 28, 08:20 UTCMay 28, 08:40 UTC20m
2026-05-28 KRE155 - May 28, 00:50 UTCMay 28, 01:10 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-5439 page for operator, model, and routing details .

Mode-S 0ACB39 frequently asked

What is Mode-S code 0ACB39?
0ACB39 is an ICAO 24-bit transponder address. Allocated to Costa Rica. Assigned to HK-5439.
Where is Mode-S 0ACB39 registered?
Mode-S code 0ACB39 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 0ACB39 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 0ACB39, octal 02545471, decimal 707,385.
What flights does 0ACB39 operate?
Mode-S 0ACB39 has broadcast 20 distinct callsigns, including KRE140, KRE2141, KRE2140, KRE155, KRE154.