Apparatus

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sensors Mode-S transponder

A4DA13

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N411YX · EMBRAER ERJ-170-200 (long wing) · operated by REPUBLIC AIRWAYS INC

Hex
A4DA13
Octal
51155023
Decimal
10,803,731
Country
US
Tail
N411YX
Type
E75L
No current signal · last broadcast Jul 26, 21:35 UTC
Flights observed
708
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:35 UTC

Last known position

Most recent position reported by Mode-S A4DA13.

Country allocation

The ICAO 24-bit address A4DA13 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
RPA4500 Republic Airlines 11 2026-07-25
RPA4553 Republic Airlines 10 2026-07-22
RPA4580 Republic Airlines 9 2026-06-14
RPA4440 Republic Airlines 8 2026-06-14
RPA4619 - 7 2026-07-02
RPA4537 Republic Airlines 7 2026-07-26
RPA4534 - 7 2026-07-13
RPA4389 - 7 2026-06-21
RPA4341 - 7 2026-06-13
RPA4781 - 6 2026-07-17
RPA4717 - 6 2026-07-13
RPA4532 - 6 2026-07-18
RPA4524 Republic Airlines 6 2026-05-29
RPA4512 Republic Airlines 6 2026-07-25
RPA4375 Republic Airlines 6 2026-06-06
RPA4804 - 5 2026-07-17
RPA4757 Republic Airlines 5 2026-07-20
RPA4745 - 5 2026-07-06
RPA4720 Republic Airlines 5 2026-07-21
RPA4683 - 5 2026-07-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 RPA4537 RIC → LGA Jul 26, 20:50 UTCJul 26, 21:35 UTC45m
2026-07-26 RPA4665 JFK → RDU Jul 26, 17:05 UTCJul 26, 19:05 UTC2h 0m
2026-07-26 RPA4665 JFK → RDU Jul 26, 17:05 UTCJul 26, 18:56 UTC1h 51m
2026-07-26 RPA4665 JFK → RDU Jul 26, 14:15 UTCJul 26, 16:00 UTC1h 45m
2026-07-26 RPA4622 JFK → BOS Jul 26, 11:35 UTCJul 26, 12:35 UTC1h 0m
2026-07-26 RPA4622 JFK → BOS Jul 26, 11:32 UTCJul 26, 12:33 UTC1h 1m
2026-07-26 RPA4603 ORD → SDF Jul 26, 00:45 UTCJul 26, 01:30 UTC45m
2026-07-25 RPA4724 IND → BOS Jul 25, 21:55 UTCJul 25, 23:05 UTC1h 10m
2026-07-25 RPA4724 IND → BOS Jul 25, 19:40 UTCJul 25, 20:45 UTC1h 5m
2026-07-25 RPA4500 LGA → RIC Jul 25, 17:00 UTCJul 25, 18:30 UTC1h 30m
2026-07-25 RPA4500 LGA → RIC Jul 25, 14:15 UTCJul 25, 15:50 UTC1h 35m
2026-07-25 RPA4512 LGA → OMA Jul 25, 11:30 UTCJul 25, 11:45 UTC15m
2026-07-25 RPA4512 LGA → OMA Jul 25, 10:20 UTCJul 25, 11:45 UTC1h 25m
2026-07-25 RPA4512 LGA → OMA Jul 25, 10:19 UTCJul 25, 11:15 UTC56m
2026-07-25 RPA4511 OMA → LGA Jul 25, 02:25 UTCJul 25, 03:30 UTC1h 5m
2026-07-24 RPA4537 RIC → LGA Jul 24, 23:35 UTCJul 25, 00:25 UTC50m
2026-07-24 RPA4537 RIC → LGA Jul 24, 21:30 UTCJul 24, 22:20 UTC50m
2026-07-24 RPA4386 DCA → DSM Jul 24, 17:15 UTCJul 24, 19:30 UTC2h 15m
2026-07-24 RPA4708 DCA → MCI Jul 24, 15:35 UTCJul 24, 15:55 UTC20m
2026-07-24 RPA4708 DCA → MCI Jul 24, 13:50 UTCJul 24, 14:10 UTC20m
2026-07-24 RPA4714 RDU → DCA Jul 24, 11:25 UTCJul 24, 12:25 UTC1h 0m
2026-07-24 RPA4640 JFK → PIT Jul 24, 02:35 UTCJul 24, 04:00 UTC1h 25m
2026-07-24 RPA4640 JFK → PIT Jul 24, 02:34 UTCJul 24, 03:44 UTC1h 10m
2026-07-23 RPA4400 PVD → DCA Jul 23, 22:35 UTCJul 24, 00:45 UTC2h 10m
2026-07-23 RPA4400 PVD → DCA Jul 23, 19:55 UTCJul 23, 21:45 UTC1h 50m
2026-07-23 RPA4500 LGA → RIC Jul 23, 16:15 UTCJul 23, 18:00 UTC1h 45m
2026-07-23 RPA4500 LGA → RIC Jul 23, 13:30 UTCJul 23, 15:00 UTC1h 30m
2026-07-23 RPA4597 CMH → BOS Jul 23, 10:45 UTCJul 23, 11:20 UTC35m
2026-07-23 RPA4520 CVG → LGA Jul 23, 00:15 UTCJul 23, 01:40 UTC1h 25m
2026-07-22 RPA4553 LGA → DTW Jul 22, 21:20 UTCJul 22, 22:35 UTC1h 15m
2026-07-22 RPA4553 LGA → DTW Jul 22, 19:20 UTCJul 22, 20:20 UTC1h 0m
2026-07-22 RPA4574 DTW → PHL Jul 22, 16:40 UTCJul 22, 17:50 UTC1h 10m
2026-07-22 RPA4567 BNA → RDU Jul 22, 14:50 UTCJul 22, 15:40 UTC50m
2026-07-22 RPA4711 GSO → LGA Jul 22, 12:15 UTCJul 22, 13:15 UTC1h 0m
2026-07-22 RPA4711 GSO → LGA Jul 22, 12:11 UTCJul 22, 13:13 UTC1h 2m
2026-07-21 RPA4337 PHL → ATL Jul 21, 23:20 UTCJul 22, 00:10 UTC50m
2026-07-21 RPA4720 MCI → LGA Jul 21, 19:55 UTCJul 21, 20:55 UTC1h 0m
2026-07-21 RPA4720 MCI → LGA Jul 21, 19:52 UTCJul 21, 20:43 UTC51m
2026-07-21 RPA4720 MCI → LGA Jul 21, 17:40 UTCJul 21, 18:35 UTC55m
2026-07-21 RPA4512 LGA → OMA Jul 21, 13:10 UTCJul 21, 14:50 UTC1h 40m
2026-07-21 RPA4511 OMA → LGA Jul 21, 11:20 UTCJul 21, 12:30 UTC1h 10m
2026-07-21 RPA4511 OMA → LGA Jul 21, 11:20 UTCJul 21, 12:29 UTC1h 9m
2026-07-21 RPA4492 - Jul 21, 01:55 UTCJul 21, 03:45 UTC1h 50m
2026-07-21 RPA4492 RDU → ORD Jul 21, 01:53 UTCJul 21, 03:43 UTC1h 50m
2026-07-20 RPA4436 PHL → BOS Jul 20, 21:50 UTCJul 20, 23:10 UTC1h 20m
2026-07-20 RPA4773 GSO → LGA Jul 20, 19:45 UTCJul 20, 20:30 UTC45m
2026-07-20 RPA4757 DCA → MVY Jul 20, 17:55 UTCJul 20, 18:40 UTC45m
2026-07-20 RPA4757 DCA → MVY Jul 20, 17:54 UTCJul 20, 18:22 UTC28m
2026-07-20 RPA4484 - Jul 20, 15:05 UTCJul 20, 16:10 UTC1h 5m
2026-07-20 RPA4633 - Jul 20, 12:10 UTCJul 20, 13:55 UTC1h 45m

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 N411YX page for operator, model, and routing details .

Mode-S A4DA13 frequently asked

What is Mode-S code A4DA13?
A4DA13 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N411YX.
Where is Mode-S A4DA13 registered?
Mode-S code A4DA13 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 A4DA13 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:35 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A4DA13, octal 51155023, decimal 10,803,731.
What flights does A4DA13 operate?
Mode-S A4DA13 has broadcast 20 distinct callsigns, including RPA4500, RPA4553, RPA4580, RPA4440, RPA4619.