Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A0144E

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N104HQ · EMBRAER ERJ-170-200 (long wing) · operated by REPUBLIC AIRWAYS INC

Hex
A0144E
Octal
50012116
Decimal
10,490,958
Country
US
Tail
N104HQ
Type
E75L
No current signal · last broadcast Jul 26, 20:55 UTC
Flights observed
712
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 20:55 UTC

Last known position

Most recent position reported by Mode-S A0144E.

Country allocation

The ICAO 24-bit address A0144E falls within the block assigned to United States (US) by ICAO Annex 10, Volume III. Every aircraft registered in United States 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
RPA4403 Republic Airlines 9 2026-04-27
RPA4708 Republic Airlines 7 2026-07-23
RPA4701 Republic Airlines 7 2026-06-14
RPA4549 - 7 2026-07-12
RPA4540 Republic Airlines 7 2026-07-25
RPA4379 - 7 2026-07-10
RPA4355 Republic Airlines 7 2026-05-16
RPA4804 Republic Airlines 6 2026-06-19
RPA4759 - 6 2026-07-14
RPA4756 - 6 2026-07-02
RPA4740 - 6 2026-07-15
RPA4709 Republic Airlines 6 2026-07-23
RPA4654 - 6 2026-07-19
RPA4619 - 6 2026-06-22
RPA4607 Republic Airlines 6 2026-06-16
RPA4339 Republic Airlines 6 2026-06-13
RPA4767 Republic Airlines 5 2026-05-27
RPA4697 - 5 2026-06-26
RPA4692 - 5 2026-07-06
RPA4685 - 5 2026-06-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 RPA4652 ORD → RDU Jul 26, 19:40 UTCJul 26, 20:45 UTC1h 5m
2026-07-26 RPA4735 PHL → SDF Jul 26, 17:20 UTCJul 26, 18:20 UTC1h 0m
2026-07-26 RPA4735 PHL → SDF Jul 26, 17:17 UTCJul 26, 18:14 UTC57m
2026-07-26 RPA4735 PHL → SDF Jul 26, 15:10 UTCJul 26, 15:55 UTC45m
2026-07-26 RPA4750 SDF → PHL Jul 26, 11:45 UTCJul 26, 13:10 UTC1h 25m
2026-07-26 RPA4466 PHL → SDF Jul 26, 00:45 UTCJul 26, 02:15 UTC1h 30m
2026-07-26 RPA4466 PHL → SDF Jul 26, 00:44 UTCJul 26, 02:11 UTC1h 27m
2026-07-25 RPA4540 BDL → DCA Jul 25, 21:45 UTCJul 25, 22:40 UTC55m
2026-07-25 RPA4540 BDL → DCA Jul 25, 19:15 UTCJul 25, 20:20 UTC1h 5m
2026-07-25 RPA4430 IND → DCA Jul 25, 16:25 UTCJul 25, 17:25 UTC1h 0m
2026-07-25 RPA4430 IND → DCA Jul 25, 16:22 UTCJul 25, 17:22 UTC1h 0m
2026-07-25 RPA4467 SDF → DCA Jul 25, 14:05 UTCJul 25, 15:05 UTC1h 0m
2026-07-25 RPA4612 PHL → BNA Jul 25, 12:08 UTCJul 25, 12:52 UTC44m
2026-07-25 RPA4612 PHL → BNA Jul 25, 12:10 UTCJul 25, 12:55 UTC45m
2026-07-25 RPA4560 PIT → LGA Jul 25, 00:35 UTCJul 25, 01:40 UTC1h 5m
2026-07-24 RPA4518 PWM → DCA Jul 24, 21:25 UTCJul 24, 23:05 UTC1h 40m
2026-07-24 RPA4676 DCA → CVG Jul 24, 18:40 UTCJul 24, 19:45 UTC1h 5m
2026-07-24 RPA4676 DCA → CVG Jul 24, 16:50 UTCJul 24, 17:45 UTC55m
2026-07-24 RPA4480 LGA → PIT Jul 24, 14:15 UTCJul 24, 15:20 UTC1h 5m
2026-07-24 RPA4532 DCA → PIT Jul 24, 12:20 UTCJul 24, 13:20 UTC1h 0m
2026-07-24 RPA4615 JFK → BNA Jul 24, 01:45 UTCJul 24, 03:15 UTC1h 30m
2026-07-23 RPA4745 PHL → BUF Jul 23, 22:55 UTCJul 24, 00:15 UTC1h 20m
2026-07-23 RPA4745 PHL → BUF Jul 23, 21:00 UTCJul 23, 22:00 UTC1h 0m
2026-07-23 RPA4386 DCA → DSM Jul 23, 17:20 UTCJul 23, 19:25 UTC2h 5m
2026-07-23 RPA4386 DCA → DSM Jul 23, 17:18 UTCJul 23, 19:23 UTC2h 5m
2026-07-23 RPA4708 DCA → MCI Jul 23, 15:40 UTCJul 23, 16:10 UTC30m
2026-07-23 RPA4708 DCA → MCI Jul 23, 15:34 UTCJul 23, 15:58 UTC24m
2026-07-23 RPA4708 DCA → MCI Jul 23, 14:10 UTCJul 23, 14:40 UTC30m
2026-07-23 RPA4714 RDU → DCA Jul 23, 11:05 UTCJul 23, 12:05 UTC1h 0m
2026-07-23 RPA4715 ILM → LGA Jul 23, 02:50 UTCJul 23, 03:55 UTC1h 5m
2026-07-23 RPA4709 BDL → DCA Jul 23, 00:13 UTCJul 23, 01:03 UTC50m
2026-07-23 RPA4709 BDL → DCA Jul 23, 00:15 UTCJul 23, 01:05 UTC50m
2026-07-22 RPA4709 BDL → DCA Jul 22, 20:55 UTCJul 22, 21:50 UTC55m
2026-07-22 RPA4516 - Jul 22, 17:35 UTCJul 22, 19:10 UTC1h 35m
2026-07-22 RPA4516 TVC → BOS Jul 22, 17:28 UTCJul 22, 19:08 UTC1h 40m
2026-07-22 RPA4516 - Jul 22, 14:25 UTCJul 22, 16:10 UTC1h 45m
2026-07-22 RPA4376 BTV → DCA Jul 22, 12:35 UTCJul 22, 13:20 UTC45m
2026-07-22 RPA4376 BTV → DCA Jul 22, 12:30 UTCJul 22, 13:06 UTC36m
2026-07-21 RPA4368 - Jul 21, 20:05 UTCJul 21, 21:45 UTC1h 40m
2026-07-21 RPA104 LGA → DCA Jul 21, 16:10 UTCJul 21, 17:40 UTC1h 30m
2026-07-21 RPA4618 LGA → CVG Jul 21, 13:25 UTCJul 21, 14:45 UTC1h 20m
2026-07-21 RPA4618 LGA → CVG Jul 21, 11:00 UTCJul 21, 12:15 UTC1h 15m
2026-07-21 RPA4679 - Jul 21, 02:20 UTCJul 21, 03:25 UTC1h 5m
2026-07-21 RPA4679 PVD → DCA Jul 21, 02:18 UTCJul 21, 03:20 UTC1h 2m
2026-07-21 RPA4679 - Jul 21, 00:40 UTCJul 21, 01:40 UTC1h 0m
2026-07-20 RPA4584 LGA → CHO Jul 20, 21:50 UTCJul 20, 23:30 UTC1h 40m
2026-07-20 RPA4584 LGA → CHO Jul 20, 17:35 UTCJul 20, 18:40 UTC1h 5m
2026-07-20 RPA4543 DCA → MSY Jul 20, 15:20 UTCJul 20, 16:35 UTC1h 15m
2026-07-20 RPA4543 DCA → MSY Jul 20, 13:20 UTCJul 20, 14:20 UTC1h 0m
2026-07-20 RPA4422 SAV → DCA Jul 20, 00:20 UTCJul 20, 01:40 UTC1h 20m

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 N104HQ page for operator, model, and routing details .

Mode-S A0144E frequently asked

What is Mode-S code A0144E?
A0144E is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N104HQ.
Where is Mode-S A0144E registered?
Mode-S code A0144E is allocated to United States (US). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is A0144E broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 20:55 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A0144E, octal 50012116, decimal 10,490,958.
What flights does A0144E operate?
Mode-S A0144E has broadcast 20 distinct callsigns, including RPA4403, RPA4708, RPA4701, RPA4549, RPA4540.