Apparatus

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sensors Mode-S transponder

A4ECA6

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N416YX · EMBRAER ERJ-170-200 (long wing) · operated by REPUBLIC AIRWAYS INC

Hex
A4ECA6
Octal
51166246
Decimal
10,808,486
Country
US
Tail
N416YX
Type
E75L
No current signal · last broadcast Jul 26, 21:30 UTC
Flights observed
705
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:30 UTC

Last known position

Most recent position reported by Mode-S A4ECA6.

Country allocation

The ICAO 24-bit address A4ECA6 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
RPA4494 - 10 2026-07-20
RPA4681 - 9 2026-06-29
RPA4475 - 9 2026-07-05
RPA4749 - 8 2026-06-14
RPA4664 Republic Airlines 8 2026-07-22
RPA4565 - 8 2026-07-08
RPA4434 - 8 2026-07-13
RPA4418 Republic Airlines 8 2026-07-24
RPA4745 Republic Airlines 7 2026-06-09
RPA4543 Republic Airlines 7 2026-07-21
RPA4439 - 7 2026-07-13
RPA4394 - 7 2026-07-16
RPA4780 Republic Airlines 6 2026-06-15
RPA4753 - 6 2026-07-19
RPA4671 - 6 2026-07-19
RPA4643 Republic Airlines 6 2026-07-26
RPA4460 - 6 2026-06-21
RPA4403 Republic Airlines 6 2026-07-25
RPA4379 - 6 2026-07-16
RPA4781 Republic Airlines 5 2026-07-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 RPA4400 PVD → DCA Jul 26, 19:45 UTCJul 26, 21:30 UTC1h 45m
2026-07-26 RPA4643 PWM → PHL Jul 26, 16:05 UTCJul 26, 17:55 UTC1h 50m
2026-07-26 RPA4643 PWM → PHL Jul 26, 16:01 UTCJul 26, 17:52 UTC1h 51m
2026-07-26 RPA4643 PWM → PHL Jul 26, 13:15 UTCJul 26, 15:05 UTC1h 50m
2026-07-26 RPA4651 JFK → ORF Jul 26, 10:10 UTCJul 26, 11:40 UTC1h 30m
2026-07-26 RPA4715 ILM → LGA Jul 26, 01:30 UTCJul 26, 02:45 UTC1h 15m
2026-07-26 RPA4715 ILM → LGA Jul 26, 01:30 UTCJul 26, 02:34 UTC1h 4m
2026-07-25 RPA4384 LGA → GSO Jul 25, 22:10 UTCJul 26, 00:05 UTC1h 55m
2026-07-25 RPA4392 DCA → LGA Jul 25, 17:55 UTCJul 25, 20:15 UTC2h 20m
2026-07-25 RPA4392 DCA → LGA Jul 25, 17:54 UTCJul 25, 20:11 UTC2h 17m
2026-07-25 RPA4392 DCA → LGA Jul 25, 14:55 UTCJul 25, 17:10 UTC2h 15m
2026-07-25 RPA4391 ALB → DCA Jul 25, 10:30 UTCJul 25, 13:00 UTC2h 30m
2026-07-25 RPA4391 ALB → DCA Jul 25, 10:26 UTCJul 25, 12:33 UTC2h 7m
2026-07-25 RPA4403 GSO → LGA Jul 25, 03:15 UTCJul 25, 05:00 UTC1h 45m
2026-07-25 RPA4403 GSO → LGA Jul 25, 03:14 UTCJul 25, 05:00 UTC1h 46m
2026-07-24 RPA4492 DCA → BDL Jul 24, 23:40 UTCJul 25, 01:20 UTC1h 40m
2026-07-24 RPA4436 PHL → BOS Jul 24, 20:55 UTCJul 24, 22:10 UTC1h 15m
2026-07-24 RPA4418 AVL → LGA Jul 24, 17:25 UTCJul 24, 18:55 UTC1h 30m
2026-07-24 RPA4418 AVL → LGA Jul 24, 14:53 UTCJul 24, 16:19 UTC1h 26m
2026-07-24 RPA4418 AVL → LGA Jul 24, 14:55 UTCJul 24, 16:30 UTC1h 35m
2026-07-24 RPA4396 PWM → PHL Jul 24, 11:15 UTCJul 24, 11:55 UTC40m
2026-07-24 RPA4396 PWM → PHL Jul 24, 11:15 UTCJul 24, 11:56 UTC41m
2026-07-24 RPA4634 BOS → TVC Jul 24, 02:01 UTCJul 24, 02:44 UTC43m
2026-07-24 RPA4634 BOS → TVC Jul 24, 02:05 UTCJul 24, 02:50 UTC45m
2026-07-23 RPA4781 PHL → MVY Jul 23, 19:50 UTCJul 23, 20:35 UTC45m
2026-07-23 RPA4781 PHL → MVY Jul 23, 19:48 UTCJul 23, 20:23 UTC35m
2026-07-23 RPA4574 DTW → PHL Jul 23, 17:05 UTCJul 23, 18:20 UTC1h 15m
2026-07-23 RPA4567 BNA → RDU Jul 23, 15:35 UTCJul 23, 16:15 UTC40m
2026-07-23 RPA4711 GSO → LGA Jul 23, 12:25 UTCJul 23, 13:35 UTC1h 10m
2026-07-23 RPA4680 LGA → CMH Jul 23, 00:49 UTCJul 23, 02:07 UTC1h 18m
2026-07-23 RPA4680 LGA → CMH Jul 23, 00:50 UTCJul 23, 02:10 UTC1h 20m
2026-07-22 RPA4617 OSU → LGA Jul 22, 21:35 UTCJul 22, 22:50 UTC1h 15m
2026-07-22 RPA4767 JFK → CMH Jul 22, 19:05 UTCJul 22, 20:25 UTC1h 20m
2026-07-22 RPA4767 JFK → CMH Jul 22, 19:02 UTCJul 22, 20:23 UTC1h 21m
2026-07-22 RPA4366 BOS → JFK Jul 22, 16:45 UTCJul 22, 17:30 UTC45m
2026-07-22 RPA4716 IND → BOS Jul 22, 13:20 UTCJul 22, 15:05 UTC1h 45m
2026-07-22 RPA4664 JFK → RDU Jul 22, 11:10 UTCJul 22, 12:05 UTC55m
2026-07-22 RPA4664 JFK → RDU Jul 22, 10:37 UTCJul 22, 11:58 UTC1h 21m
2026-07-22 RPA4406 PVD → DCA Jul 22, 04:10 UTCJul 22, 05:25 UTC1h 15m
2026-07-21 RPA4584 LGA → CHO Jul 21, 18:15 UTCJul 21, 19:35 UTC1h 20m
2026-07-21 RPA4543 DCA → MSY Jul 21, 15:15 UTCJul 21, 16:50 UTC1h 35m
2026-07-21 RPA4543 DCA → MSY Jul 21, 13:05 UTCJul 21, 14:05 UTC1h 0m
2026-07-21 RPA9937 DCA → BOS Jul 21, 11:15 UTCJul 21, 11:50 UTC35m
2026-07-21 RPA4589 LGA → ORF Jul 21, 01:06 UTCJul 21, 02:02 UTC56m
2026-07-21 RPA4589 LGA → ORF Jul 21, 01:10 UTCJul 21, 02:00 UTC50m
2026-07-20 RPA4437 - Jul 20, 22:10 UTCJul 20, 23:55 UTC1h 44m
2026-07-20 RPA4600 LGA → IND Jul 20, 19:55 UTCJul 20, 21:25 UTC1h 30m
2026-07-20 RPA4600 LGA → IND Jul 20, 19:53 UTCJul 20, 21:26 UTC1h 33m
2026-07-20 RPA4501 IND → DCA Jul 20, 17:40 UTCJul 20, 18:30 UTC50m
2026-07-20 RPA4501 IND → DCA Jul 20, 17:36 UTCJul 20, 18:22 UTC46m

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 N416YX page for operator, model, and routing details .

Mode-S A4ECA6 frequently asked

What is Mode-S code A4ECA6?
A4ECA6 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N416YX.
Where is Mode-S A4ECA6 registered?
Mode-S code A4ECA6 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 A4ECA6 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:30 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A4ECA6, octal 51166246, decimal 10,808,486.
What flights does A4ECA6 operate?
Mode-S A4ECA6 has broadcast 20 distinct callsigns, including RPA4494, RPA4681, RPA4475, RPA4749, RPA4664.