Apparatus

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sensors Mode-S transponder

0AC333

ICAO 24-bit transponder address · allocated to Costa Rica

Currently assigned to HK-5139 · BOEING 737-400

Hex
0AC333
Octal
02541463
Decimal
705,331
Country
CR
Tail
HK-5139
Type
B734
No current signal · last broadcast 1d ago
Flights observed
182
Distinct callsigns
20
Country
CR
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S 0AC333.

Country allocation

The ICAO 24-bit address 0AC333 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
HK5139 - 91 2026-07-12
ACL1171 - 24 2026-07-16
ACL1172 - 19 2026-06-18
ACL5139 - 15 2026-07-12
ACL864 - 5 2026-06-09
ACL865 - 4 2026-06-09
ACL1155 Itali Airlines 4 2026-06-17
ACL1173 Itali Airlines 3 2026-05-25
ACL1156 Itali Airlines 3 2026-05-29
ACL1165 Itali Airlines 2 2026-05-27
ACL1163 - 2 2026-07-15
ACL1154 - 2 2026-05-20
ACL863 - 1 2026-06-05
ACL862 - 1 2026-06-05
ACL1167 Itali Airlines 1 2026-06-10
ACL1164 - 1 2026-05-20
ACL1162 - 1 2026-05-21
ACL1161 - 1 2026-05-21
ACL1159 Itali Airlines 1 2026-05-27
ACL1153 Itali Airlines 1 2026-05-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-16 ACL1171 - Jul 16, 13:49 UTCJul 16, 14:00 UTC10m
2026-07-15 ACL1163 - Jul 15, 17:45 UTCJul 15, 22:00 UTC4h 15m
2026-07-12 HK5139 - Jul 12, 23:50 UTCJul 13, 00:05 UTC15m
2026-07-12 HK5139 - Jul 12, 17:40 UTCJul 12, 19:55 UTC2h 15m
2026-07-12 ACL1171 - Jul 12, 10:50 UTCJul 12, 15:15 UTC4h 25m
2026-07-12 ACL5139 - Jul 12, 00:40 UTCJul 12, 02:45 UTC2h 5m
2026-07-11 HK5139 - Jul 11, 16:45 UTCJul 11, 16:55 UTC10m
2026-07-11 HK5139 - Jul 11, 14:35 UTCJul 11, 14:50 UTC15m
2026-07-10 HK5139 - Jul 10, 17:50 UTCJul 10, 20:05 UTC2h 15m
2026-07-06 HK5139 - Jul 6, 00:45 UTCJul 6, 03:05 UTC2h 20m
2026-07-05 HK5139 - Jul 5, 19:15 UTCJul 5, 19:30 UTC15m
2026-07-04 ACL5139 - Jul 4, 23:05 UTCJul 5, 00:00 UTC55m
2026-07-04 HK5139 - Jul 4, 16:30 UTCJul 4, 16:40 UTC10m
2026-07-01 HK5139 - Jul 1, 20:35 UTCJul 1, 20:45 UTC10m
2026-06-28 ACL1171 - Jun 28, 10:04 UTCJun 28, 13:34 UTC3h 30m
2026-06-28 ACL5139 - Jun 28, 00:20 UTCJun 28, 01:10 UTC50m
2026-06-21 ACL5139 - Jun 21, 00:19 UTCJun 21, 01:14 UTC55m
2026-06-19 HK5139 - Jun 19, 16:44 UTCJun 19, 17:04 UTC20m
2026-06-18 ACL1171 - Jun 18, 15:20 UTCJun 18, 15:35 UTC15m
2026-06-18 ACL1171 - Jun 18, 14:15 UTCJun 18, 14:30 UTC15m
2026-06-18 ACL1172 - Jun 18, 08:05 UTCJun 18, 11:40 UTC3h 35m
2026-06-18 ACL5139 - Jun 18, 00:45 UTCJun 18, 02:45 UTC2h 0m
2026-06-17 HK5139 - Jun 17, 15:50 UTCJun 17, 16:05 UTC15m
2026-06-17 ACL1155 SJO → BOG Jun 17, 09:25 UTCJun 17, 12:50 UTC3h 25m
2026-06-16 HK5139 - Jun 16, 22:55 UTCJun 16, 23:05 UTC10m
2026-06-16 HK5139 - Jun 16, 20:40 UTCJun 16, 20:50 UTC10m
2026-06-15 ACL1172 - Jun 15, 08:40 UTCJun 15, 15:55 UTC7h 15m
2026-06-14 ACL5139 - Jun 14, 01:00 UTCJun 14, 17:25 UTC16h 25m
2026-06-13 HK5139 - Jun 13, 17:25 UTCJun 13, 17:35 UTC10m
2026-06-12 HK5139 - Jun 12, 23:40 UTCJun 13, 02:10 UTC2h 30m
2026-06-12 HK5139 - Jun 12, 21:20 UTCJun 12, 21:30 UTC10m
2026-06-12 HK5139 - Jun 12, 19:20 UTCJun 12, 19:35 UTC15m
2026-06-12 HK5139 - Jun 12, 00:50 UTCJun 12, 01:05 UTC15m
2026-06-11 ACL1171 CUR → BOG Jun 11, 15:30 UTCJun 11, 20:40 UTC5h 10m
2026-06-11 ACL1172 - Jun 11, 08:20 UTCJun 11, 12:30 UTC4h 10m
2026-06-11 ACL5139 - Jun 11, 03:10 UTCJun 11, 05:15 UTC2h 5m
2026-06-10 HK5139 - Jun 10, 18:05 UTCJun 10, 20:15 UTC2h 10m
2026-06-10 ACL1167 BGA → BOG Jun 10, 09:40 UTCJun 10, 13:15 UTC3h 35m
2026-06-10 HK5139 - Jun 10, 00:10 UTCJun 10, 00:30 UTC20m
2026-06-09 HK5139 - Jun 9, 22:00 UTCJun 9, 22:10 UTC10m
2026-06-09 HK5139 - Jun 9, 17:55 UTCJun 9, 20:05 UTC2h 10m
2026-06-09 ACL865 - Jun 9, 14:30 UTCJun 9, 14:45 UTC15m
2026-06-09 ACL864 - Jun 9, 10:35 UTCJun 9, 13:35 UTC3h 0m
2026-06-08 ACL1171 CUR → BOG Jun 8, 15:00 UTCJun 8, 15:15 UTC15m
2026-06-08 ACL1171 CUR → BOG Jun 8, 13:55 UTCJun 8, 14:10 UTC15m
2026-06-08 ACL1172 - Jun 8, 07:00 UTCJun 8, 11:20 UTC4h 20m
2026-06-08 HK5139 - Jun 8, 00:30 UTCJun 8, 03:00 UTC2h 30m
2026-06-07 HK5139 - Jun 7, 20:15 UTCJun 7, 22:20 UTC2h 5m
2026-06-07 ACL1171 CUR → BOG Jun 7, 14:35 UTCJun 7, 15:10 UTC35m
2026-06-07 ACL1172 - Jun 7, 06:45 UTCJun 7, 13:40 UTC6h 55m

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-5139 page for operator, model, and routing details .

Mode-S 0AC333 frequently asked

What is Mode-S code 0AC333?
0AC333 is an ICAO 24-bit transponder address. Allocated to Costa Rica. Assigned to HK-5139.
Where is Mode-S 0AC333 registered?
Mode-S code 0AC333 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 0AC333 broadcasting right now?
No active broadcast right now. Last signal was 1d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex 0AC333, octal 02541463, decimal 705,331.
What flights does 0AC333 operate?
Mode-S 0AC333 has broadcast 20 distinct callsigns, including HK5139, ACL1171, ACL1172, ACL5139, ACL864.