Apparatus

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sensors Mode-S transponder

0ACB2D

ICAO 24-bit transponder address · allocated to Costa Rica

Currently assigned to HK-5434 · BOEING 737-400

Hex
0ACB2D
Octal
02545455
Decimal
707,373
Country
CR
Tail
HK-5434
Type
B734
No current signal · last broadcast 17h ago
Flights observed
153
Distinct callsigns
20
Country
CR
Last broadcast
17h ago

Last known position

Most recent position reported by Mode-S 0ACB2D.

Country allocation

The ICAO 24-bit address 0ACB2D 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
KRE171 - 24 2026-07-11
KRE170 - 14 2026-06-06
KRE143 - 14 2026-07-08
KRE144 - 10 2026-07-10
KRE145 - 9 2026-06-19
KRE2170 - 7 2026-07-11
KRE147 - 7 2026-06-17
KRE146 - 7 2026-06-17
KRE172 - 6 2026-07-10
KRE142 - 6 2026-07-07
KRE3170 - 4 2026-07-11
KRE2171 - 4 2026-06-06
KRE2143 - 4 2026-07-09
KRE140 - 4 2026-07-07
KRE185 - 3 2026-07-12
KRE173 - 3 2026-07-10
KRE155 - 3 2026-06-27
KRE141 - 3 2026-07-09
KRE373 - 2 2026-04-20
KRE372 - 2 2026-04-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 KRE156 - Jul 13, 14:00 UTCJul 13, 19:10 UTC5h 10m
2026-07-12 KRE185 - Jul 12, 14:01 UTCJul 12, 15:25 UTC1h 25m
2026-07-12 KRE184 - Jul 12, 11:20 UTCJul 12, 11:35 UTC15m
2026-07-11 KRE3170 BOG → BOG Jul 11, 21:50 UTCJul 12, 01:45 UTC3h 55m
2026-07-11 KRE2170 BOG → BOG Jul 11, 16:20 UTCJul 11, 20:20 UTC4h 0m
2026-07-11 KRE171 - Jul 11, 10:10 UTCJul 11, 14:20 UTC4h 10m
2026-07-10 KRE172 - Jul 10, 17:30 UTCJul 10, 17:50 UTC20m
2026-07-10 KRE171 - Jul 10, 10:55 UTCJul 10, 15:20 UTC4h 25m
2026-07-10 KRE144 - Jul 10, 04:25 UTCJul 10, 04:40 UTC15m
2026-07-10 KRE173 - Jul 10, 02:45 UTCJul 10, 03:05 UTC20m
2026-07-09 KRE172 - Jul 9, 22:45 UTCJul 9, 22:55 UTC10m
2026-07-09 KRE2143 - Jul 9, 18:30 UTCJul 9, 20:20 UTC1h 50m
2026-07-09 KRE171 - Jul 9, 11:20 UTCJul 9, 16:35 UTC5h 15m
2026-07-09 KRE141 - Jul 9, 06:05 UTCJul 9, 09:05 UTC3h 0m
2026-07-08 KRE143 - Jul 8, 01:30 UTCJul 8, 01:55 UTC25m
2026-07-07 KRE142 - Jul 7, 21:55 UTCJul 7, 23:25 UTC1h 30m
2026-07-07 KRE171 - Jul 7, 15:25 UTCJul 7, 15:45 UTC20m
2026-07-07 KRE141 - Jul 7, 07:45 UTCJul 7, 08:00 UTC15m
2026-07-07 KRE140 - Jul 7, 05:00 UTCJul 7, 05:10 UTC10m
2026-07-03 KRE143 - Jul 3, 00:40 UTCJul 3, 01:10 UTC30m
2026-07-02 KRE142 - Jul 2, 22:30 UTCJul 2, 23:00 UTC30m
2026-07-01 KRE2143 - Jul 1, 18:20 UTCJul 1, 18:50 UTC30m
2026-07-01 KRE171 - Jul 1, 15:50 UTCJul 1, 16:20 UTC30m
2026-06-27 KRE155 - Jun 27, 00:39 UTCJun 27, 00:50 UTC10m
2026-06-26 KRE143 - Jun 26, 00:39 UTCJun 26, 01:10 UTC30m
2026-06-25 KRE143 - Jun 25, 22:45 UTCJun 25, 23:14 UTC30m
2026-06-20 KRE3143 - Jun 20, 19:29 UTCJun 20, 22:59 UTC3h 30m
2026-06-20 KRE3142 - Jun 20, 12:39 UTCJun 20, 18:29 UTC5h 50m
2026-06-19 KRE173 - Jun 19, 21:04 UTCJun 19, 21:14 UTC10m
2026-06-19 KRE172 - Jun 19, 17:59 UTCJun 19, 18:14 UTC15m
2026-06-19 KRE171 - Jun 19, 11:45 UTCJun 19, 15:49 UTC4h 5m
2026-06-19 KRE145 - Jun 19, 07:04 UTCJun 19, 07:19 UTC15m
2026-06-19 KRE144 - Jun 19, 04:10 UTCJun 19, 04:29 UTC20m
2026-06-19 KRE143 - Jun 19, 00:34 UTCJun 19, 02:09 UTC1h 35m
2026-06-18 KRE142 - Jun 18, 21:55 UTCJun 18, 23:30 UTC1h 35m
2026-06-17 KRE171 - Jun 17, 11:25 UTCJun 17, 16:45 UTC5h 20m
2026-06-17 KRE147 - Jun 17, 09:15 UTCJun 17, 09:35 UTC20m
2026-06-17 KRE146 - Jun 17, 07:10 UTCJun 17, 07:25 UTC15m
2026-06-14 KRE185 - Jun 14, 14:45 UTCJun 14, 15:00 UTC15m
2026-06-10 KRE2170 - Jun 10, 17:35 UTCJun 10, 17:50 UTC15m
2026-06-09 KRE185 - Jun 9, 16:55 UTCJun 9, 17:20 UTC25m
2026-06-09 KRE174 - Jun 9, 09:40 UTCJun 9, 13:20 UTC3h 40m
2026-06-06 KRE2171 - Jun 6, 23:44 UTCJun 7, 00:10 UTC25m
2026-06-06 KRE3170 - Jun 6, 19:54 UTCJun 6, 20:10 UTC15m
2026-06-06 KRE171 - Jun 6, 16:39 UTCJun 6, 16:55 UTC15m
2026-06-06 KRE170 - Jun 6, 11:00 UTCJun 6, 11:14 UTC15m
2026-06-05 KRE171 - Jun 5, 22:30 UTCJun 5, 22:45 UTC15m
2026-06-05 KRE2143 - Jun 5, 00:30 UTCJun 5, 02:10 UTC1h 40m
2026-06-04 KRE2142 - Jun 4, 22:30 UTCJun 4, 23:00 UTC30m
2026-06-03 KRE146 - Jun 3, 06:55 UTCJun 3, 07:10 UTC15m

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-5434 page for operator, model, and routing details .

Mode-S 0ACB2D frequently asked

What is Mode-S code 0ACB2D?
0ACB2D is an ICAO 24-bit transponder address. Allocated to Costa Rica. Assigned to HK-5434.
Where is Mode-S 0ACB2D registered?
Mode-S code 0ACB2D 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 0ACB2D broadcasting right now?
No active broadcast right now. Last signal was 17h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 0ACB2D, octal 02545455, decimal 707,373.
What flights does 0ACB2D operate?
Mode-S 0ACB2D has broadcast 20 distinct callsigns, including KRE171, KRE170, KRE143, KRE144, KRE145.