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sensors Mode-S transponder

A9C380

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N728YX · EMBRAER ERJ-170-200 (long wing) · operated by REPUBLIC AIRWAYS INC

Hex
A9C380
Octal
52341600
Decimal
11,125,632
Country
US
Tail
N728YX
Type
E75L
No current signal · last broadcast Jul 26, 22:00 UTC
Flights observed
642
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:00 UTC

Last known position

Most recent position reported by Mode-S A9C380.

Country allocation

The ICAO 24-bit address A9C380 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
RPA3616 Republic Airlines 9 2026-07-17
RPA3604 - 8 2026-07-17
RPA3419 - 8 2026-07-02
RPA3668 - 7 2026-06-25
RPA3660 - 7 2026-06-28
RPA3504 - 7 2026-06-17
RPA3478 Republic Airlines 7 2026-07-24
RPA3644 - 6 2026-07-08
RPA3575 - 6 2026-07-17
RPA3538 Republic Airlines 6 2026-06-05
RPA3513 Republic Airlines 6 2026-07-24
RPA3471 Republic Airlines 6 2026-07-24
RPA3414 - 6 2026-07-13
RPA3410 - 6 2026-07-01
RPA3707 Republic Airlines 5 2026-06-04
RPA3639 Republic Airlines 5 2026-07-22
RPA3621 - 5 2026-07-13
RPA3595 Republic Airlines 5 2026-07-22
RPA3588 Republic Airlines 5 2026-06-11
RPA3585 Republic Airlines 5 2026-06-01

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 RPA3522 GSO → EWR Jul 26, 20:40 UTCJul 26, 22:00 UTC1h 20m
2026-07-26 RPA3528 EWR → BUF Jul 26, 17:15 UTCJul 26, 19:32 UTC2h 17m
2026-07-26 RPA3528 EWR → BUF Jul 26, 17:25 UTCJul 26, 19:30 UTC2h 5m
2026-07-25 RPA3527 EWR → SDF Jul 25, 22:10 UTCJul 25, 23:40 UTC1h 30m
2026-07-25 RPA3574 EWR → DTW Jul 25, 19:30 UTCJul 25, 20:45 UTC1h 15m
2026-07-25 RPA3541 DCA → EWR Jul 25, 14:45 UTCJul 25, 15:55 UTC1h 10m
2026-07-25 RPA3517 EWR → YYZ Jul 25, 11:33 UTCJul 25, 13:17 UTC1h 44m
2026-07-25 RPA3517 EWR → YYZ Jul 25, 11:45 UTCJul 25, 13:25 UTC1h 40m
2026-07-25 RPA3491 BUF → EWR Jul 25, 00:40 UTCJul 25, 01:45 UTC1h 5m
2026-07-25 RPA3491 BUF → EWR Jul 25, 00:32 UTCJul 25, 01:41 UTC1h 9m
2026-07-24 RPA3478 EWR → ILM Jul 24, 22:00 UTCJul 24, 22:55 UTC55m
2026-07-24 RPA3471 EWR → GSO Jul 24, 17:55 UTCJul 24, 19:35 UTC1h 40m
2026-07-24 RPA3513 EWR → BTV Jul 24, 15:20 UTCJul 24, 16:35 UTC1h 15m
2026-07-24 RPA3642 PWM → ORD Jul 24, 11:15 UTCJul 24, 13:15 UTC2h 0m
2026-07-24 RPA3563 MSY → EWR Jul 24, 01:49 UTCJul 24, 04:09 UTC2h 20m
2026-07-24 RPA3563 MSY → EWR Jul 24, 01:55 UTCJul 24, 04:10 UTC2h 15m
2026-07-23 RPA3716 EWR → IAD Jul 23, 23:20 UTCJul 24, 00:15 UTC55m
2026-07-23 RPA3607 EWR → MSN Jul 23, 21:00 UTCJul 23, 21:50 UTC50m
2026-07-23 RPA3447 IAD → JAX Jul 23, 17:55 UTCJul 23, 19:40 UTC1h 45m
2026-07-23 RPA3676 EWR → BFT Jul 23, 15:00 UTCJul 23, 16:40 UTC1h 40m
2026-07-23 RPA3416 GSP → EWR Jul 23, 12:25 UTCJul 23, 13:35 UTC1h 10m
2026-07-22 RPA3674 IAD → YYZ Jul 22, 23:15 UTCJul 23, 00:00 UTC45m
2026-07-22 RPA3662 GSP → EWR Jul 22, 20:20 UTCJul 22, 21:40 UTC1h 20m
2026-07-22 RPA3432 BUF → EWR Jul 22, 18:05 UTCJul 22, 19:05 UTC1h 0m
2026-07-22 RPA3595 SDF → EWR Jul 22, 14:45 UTCJul 22, 16:40 UTC1h 55m
2026-07-22 RPA3639 EWR → CMH Jul 22, 12:30 UTCJul 22, 13:25 UTC55m
2026-07-22 RPA3303 PIT → EWR Jul 22, 10:20 UTCJul 22, 10:59 UTC39m
2026-07-21 RPA3579 CVG → EWR Jul 21, 21:50 UTCJul 21, 22:55 UTC1h 5m
2026-07-21 RPA3413 EWR → CMH Jul 21, 17:00 UTCJul 21, 18:20 UTC1h 20m
2026-07-21 RPA3552 IAD → BOS Jul 21, 14:18 UTCJul 21, 15:21 UTC1h 3m
2026-07-21 RPA3552 IAD → BOS Jul 21, 14:10 UTCJul 21, 15:25 UTC1h 15m
2026-07-20 RPA3678 GSO → EWR Jul 20, 22:25 UTCJul 21, 00:20 UTC1h 55m
2026-07-20 RPA3576 EWR → DTW Jul 20, 19:10 UTCJul 20, 21:30 UTC2h 20m
2026-07-20 RPA3413 EWR → CMH Jul 20, 17:05 UTCJul 20, 18:10 UTC1h 5m
2026-07-20 RPA3552 IAD → BOS Jul 20, 14:50 UTCJul 20, 16:00 UTC1h 10m
2026-07-20 RPA3552 IAD → BOS Jul 20, 14:48 UTCJul 20, 16:02 UTC1h 14m
2026-07-20 RPA3679 BNA → EWR Jul 20, 10:35 UTCJul 20, 11:20 UTC45m
2026-07-20 RPA3403 ATL → EWR Jul 20, 03:00 UTCJul 20, 03:55 UTC55m
2026-07-19 RPA3583 BOS → EWR Jul 19, 23:55 UTCJul 20, 01:00 UTC1h 5m
2026-07-19 RPA3536 ORD → YUL Jul 19, 19:20 UTCJul 19, 21:05 UTC1h 45m
2026-07-19 RPA3429 MEM → EWR Jul 19, 17:50 UTCJul 19, 17:55 UTC5m
2026-07-19 RPA3429 MEM → EWR Jul 19, 16:45 UTCJul 19, 17:55 UTC1h 10m
2026-07-19 RPA3429 MEM → EWR Jul 19, 16:59 UTCJul 19, 17:32 UTC33m
2026-07-18 RPA3322 BTV → CVG Jul 18, 20:30 UTCJul 18, 21:55 UTC1h 25m
2026-07-18 RPA3322 BTV → CVG Jul 18, 20:43 UTCJul 18, 21:59 UTC1h 16m
2026-07-18 RPA3528 - Jul 18, 17:30 UTCJul 18, 19:40 UTC2h 10m
2026-07-18 RPA3709 - Jul 18, 14:15 UTCJul 18, 15:25 UTC1h 10m
2026-07-18 RPA3550 EWR → CLT Jul 18, 12:50 UTCJul 18, 13:25 UTC35m
2026-07-18 RPA3550 EWR → CLT Jul 18, 12:49 UTCJul 18, 13:20 UTC31m
2026-07-17 RPA3575 - Jul 17, 22:20 UTCJul 17, 23:55 UTC1h 35m

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 N728YX page for operator, model, and routing details .

Mode-S A9C380 frequently asked

What is Mode-S code A9C380?
A9C380 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N728YX.
Where is Mode-S A9C380 registered?
Mode-S code A9C380 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 A9C380 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:00 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A9C380, octal 52341600, decimal 11,125,632.
What flights does A9C380 operate?
Mode-S A9C380 has broadcast 20 distinct callsigns, including RPA3616, RPA3604, RPA3419, RPA3668, RPA3660.