Apparatus

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sensors Mode-S transponder

A4F7CB

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N419YX · EMBRAER ERJ-170-200 (long wing) · operated by REPUBLIC AIRWAYS INC

Hex
A4F7CB
Octal
51173713
Decimal
10,811,339
Country
US
Tail
N419YX
Type
E75L
No current signal · last broadcast Jul 26, 22:25 UTC
Flights observed
713
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:25 UTC

Last known position

Most recent position reported by Mode-S A4F7CB.

Country allocation

The ICAO 24-bit address A4F7CB 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
RPA4709 - 10 2026-06-23
RPA4397 - 10 2026-07-02
RPA4745 Republic Airlines 8 2026-06-12
RPA4466 - 8 2026-07-18
RPA4434 - 7 2026-07-09
RPA4379 Republic Airlines 7 2026-05-26
RPA4359 Republic Airlines 7 2026-05-25
RPA4356 - 7 2026-07-11
RPA4765 - 6 2026-07-18
RPA4757 - 6 2026-06-22
RPA4732 Republic Airlines 6 2026-05-15
RPA4678 - 6 2026-06-17
RPA4493 Republic Airlines 6 2026-06-22
RPA4432 Republic Airlines 6 2026-06-29
RPA4378 - 6 2026-07-19
RPA4750 - 5 2026-06-20
RPA4749 - 5 2026-07-17
RPA4739 Republic Airlines 5 2026-07-26
RPA4738 Republic Airlines 5 2026-07-20
RPA4707 Republic Airlines 5 2026-05-05

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 RPA4739 IND → ORD Jul 26, 21:15 UTCJul 26, 22:15 UTC1h 0m
2026-07-26 RPA4739 IND → ORD Jul 26, 18:50 UTCJul 26, 20:00 UTC1h 10m
2026-07-26 RPA4574 DTW → PHL Jul 26, 16:40 UTCJul 26, 17:50 UTC1h 10m
2026-07-26 RPA4567 BNA → RDU Jul 26, 15:06 UTCJul 26, 15:49 UTC43m
2026-07-26 RPA4567 BNA → RDU Jul 26, 15:10 UTCJul 26, 15:50 UTC40m
2026-07-26 RPA4711 GSO → LGA Jul 26, 12:30 UTCJul 26, 13:40 UTC1h 10m
2026-07-25 RPA4337 PHL → ATL Jul 25, 23:50 UTCJul 26, 00:40 UTC50m
2026-07-25 RPA4706 BTV → DCA Jul 25, 17:55 UTCJul 25, 20:05 UTC2h 10m
2026-07-25 RPA4705 STL → PHL Jul 25, 14:50 UTCJul 25, 16:50 UTC2h 0m
2026-07-25 RPA4688 LGA → ROA Jul 25, 11:30 UTCJul 25, 13:10 UTC1h 40m
2026-07-25 RPA4345 BOS → IND Jul 25, 01:45 UTCJul 25, 02:35 UTC50m
2026-07-24 RPA4524 MSP → LGA Jul 24, 21:50 UTCJul 25, 00:30 UTC2h 40m
2026-07-24 RPA4524 MSP → LGA Jul 24, 18:00 UTCJul 24, 20:45 UTC2h 45m
2026-07-24 RPA4645 PHL → BTV Jul 24, 16:13 UTCJul 24, 16:53 UTC40m
2026-07-24 RPA4645 PHL → BTV Jul 24, 16:15 UTCJul 24, 16:55 UTC40m
2026-07-24 RPA4618 LGA → CVG Jul 24, 13:35 UTCJul 24, 14:50 UTC1h 15m
2026-07-24 RPA4618 LGA → CVG Jul 24, 11:00 UTCJul 24, 12:15 UTC1h 15m
2026-07-23 RPA4402 IND → ORD Jul 23, 23:50 UTCJul 24, 00:40 UTC50m
2026-07-23 RPA4402 IND → ORD Jul 23, 21:55 UTCJul 23, 22:50 UTC55m
2026-07-23 RPA4753 JFK → RDU Jul 23, 19:05 UTCJul 23, 20:25 UTC1h 20m
2026-07-23 RPA4753 JFK → RDU Jul 23, 16:45 UTCJul 23, 18:05 UTC1h 20m
2026-07-23 RPA4671 JFK → DCA Jul 23, 14:55 UTCJul 23, 15:40 UTC45m
2026-07-23 RPA4657 CVG → JFK Jul 23, 11:40 UTCJul 23, 13:10 UTC1h 30m
2026-07-23 RPA4776 JFK → BOS Jul 23, 03:35 UTCJul 23, 04:20 UTC45m
2026-07-23 RPA4776 JFK → BOS Jul 23, 03:31 UTCJul 23, 04:15 UTC44m
2026-07-23 RPA4492 - Jul 23, 00:20 UTCJul 23, 02:10 UTC1h 50m
2026-07-23 RPA4492 RDU → ORD Jul 23, 00:18 UTCJul 23, 02:08 UTC1h 50m
2026-07-22 RPA4436 PHL → BOS Jul 22, 21:50 UTCJul 22, 23:20 UTC1h 30m
2026-07-22 RPA4436 PHL → BOS Jul 22, 21:49 UTCJul 22, 23:12 UTC1h 23m
2026-07-22 RPA4565 DCA → PWM Jul 22, 20:05 UTCJul 22, 20:45 UTC40m
2026-07-22 RPA4565 DCA → PWM Jul 22, 18:35 UTCJul 22, 19:15 UTC40m
2026-07-22 RPA419 RDU → LGA Jul 22, 16:15 UTCJul 22, 17:25 UTC1h 10m
2026-07-21 RPA4700 CMH → DCA Jul 21, 16:20 UTCJul 21, 17:05 UTC45m
2026-07-21 RPA4393 JFK → BOS Jul 21, 13:55 UTCJul 21, 15:00 UTC1h 5m
2026-07-21 RPA4393 JFK → BOS Jul 21, 11:25 UTCJul 21, 12:05 UTC40m
2026-07-21 RPA4433 BOS → JFK Jul 21, 02:55 UTCJul 21, 04:05 UTC1h 10m
2026-07-21 RPA4585 BOS → IND Jul 21, 00:09 UTCJul 21, 02:10 UTC2h 1m
2026-07-21 RPA4585 BOS → IND Jul 21, 00:10 UTCJul 21, 02:15 UTC2h 5m
2026-07-20 RPA4738 DCA → MCI Jul 20, 21:15 UTCJul 20, 23:10 UTC1h 55m
2026-07-20 RPA4738 DCA → MCI Jul 20, 16:35 UTCJul 20, 18:10 UTC1h 35m
2026-07-20 RPA4367 DCA → PVD Jul 20, 15:05 UTCJul 20, 15:50 UTC45m
2026-07-20 RPA4564 - Jul 20, 12:00 UTCJul 20, 14:10 UTC2h 10m
2026-07-20 RPA9929 - Jul 20, 09:40 UTCJul 20, 11:05 UTC1h 25m
2026-07-20 RPA4539 MEM → LGA Jul 20, 07:20 UTCJul 20, 08:15 UTC55m
2026-07-20 RPA4539 MEM → LGA Jul 20, 07:16 UTCJul 20, 08:14 UTC58m
2026-07-20 RPA4457 - Jul 20, 04:45 UTCJul 20, 06:05 UTC1h 20m
2026-07-20 RPA4696 LGA → MEM Jul 20, 01:10 UTCJul 20, 03:24 UTC2h 14m
2026-07-20 RPA4696 LGA → MEM Jul 20, 01:10 UTCJul 20, 03:30 UTC2h 20m
2026-07-19 RPA4378 - Jul 19, 22:30 UTCJul 19, 23:40 UTC1h 10m
2026-07-19 RPA4378 BUF → LGA Jul 19, 22:27 UTCJul 19, 23:30 UTC1h 3m

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 N419YX page for operator, model, and routing details .

Mode-S A4F7CB frequently asked

What is Mode-S code A4F7CB?
A4F7CB is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N419YX.
Where is Mode-S A4F7CB registered?
Mode-S code A4F7CB 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 A4F7CB broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:25 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A4F7CB, octal 51173713, decimal 10,811,339.
What flights does A4F7CB operate?
Mode-S A4F7CB has broadcast 20 distinct callsigns, including RPA4709, RPA4397, RPA4745, RPA4466, RPA4434.