Apparatus

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sensors Mode-S transponder

A9D0FE

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N731YX · EMBRAER ERJ-170-200 (long wing) · operated by REPUBLIC AIRWAYS INC

Hex
A9D0FE
Octal
52350376
Decimal
11,129,086
Country
US
Tail
N731YX
Type
E75L
No current signal · last broadcast Jul 26, 21:25 UTC
Flights observed
698
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:25 UTC

Last known position

Most recent position reported by Mode-S A9D0FE.

Country allocation

The ICAO 24-bit address A9D0FE 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
RPA3628 - 11 2026-07-09
RPA3545 - 9 2026-06-14
RPA3425 - 9 2026-07-22
RPA3402 Republic Airlines 9 2026-07-24
RPA3422 Republic Airlines 8 2026-07-26
RPA3621 Republic Airlines 7 2026-05-25
RPA3600 Republic Airlines 7 2026-07-26
RPA3554 - 7 2026-07-16
RPA3513 - 7 2026-07-04
RPA3444 Republic Airlines 7 2026-07-22
RPA3670 Republic Airlines 6 2026-07-19
RPA3623 - 6 2026-07-07
RPA3614 - 6 2026-07-03
RPA3598 Republic Airlines 6 2026-07-01
RPA3596 Republic Airlines 6 2026-06-06
RPA3484 - 6 2026-07-16
RPA3443 Republic Airlines 6 2026-06-05
RPA3436 - 6 2026-07-08
RPA3429 Republic Airlines 6 2026-06-18
RPA3414 Republic Airlines 6 2026-05-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 RPA3575 GSP → EWR Jul 26, 20:25 UTCJul 26, 21:25 UTC1h 0m
2026-07-26 RPA3422 EWR → CLT Jul 26, 14:25 UTCJul 26, 15:15 UTC50m
2026-07-26 RPA3600 PHL → EWR Jul 26, 10:45 UTCJul 26, 12:35 UTC1h 50m
2026-07-26 RPA3613 EWR → BTV Jul 26, 00:46 UTCJul 26, 01:26 UTC40m
2026-07-26 RPA3613 EWR → BTV Jul 26, 00:30 UTCJul 26, 01:30 UTC1h 0m
2026-07-25 RPA3691 ORF → EWR Jul 25, 22:15 UTCJul 25, 23:20 UTC1h 5m
2026-07-25 RPA3509 EWR → BNA Jul 25, 19:15 UTCJul 25, 20:45 UTC1h 30m
2026-07-25 RPA3509 EWR → BNA Jul 25, 19:26 UTCJul 25, 20:37 UTC1h 11m
2026-07-25 RPA3663 EWR → ROC Jul 25, 14:50 UTCJul 25, 16:30 UTC1h 40m
2026-07-25 RPA3663 EWR → ROC Jul 25, 15:00 UTCJul 25, 16:13 UTC1h 13m
2026-07-25 RPA3612 CMH → EWR Jul 25, 12:25 UTCJul 25, 13:35 UTC1h 10m
2026-07-25 RPA3693 IAD → BTV Jul 25, 10:20 UTCJul 25, 10:55 UTC35m
2026-07-25 RPA3502 MCI → EWR Jul 25, 02:25 UTCJul 25, 02:55 UTC30m
2026-07-25 RPA3433 BNA → EWR Jul 25, 00:10 UTCJul 25, 01:00 UTC50m
2026-07-24 RPA3488 SAV → EWR Jul 24, 21:53 UTCJul 24, 22:30 UTC37m
2026-07-24 RPA3488 SAV → EWR Jul 24, 21:40 UTCJul 24, 22:35 UTC55m
2026-07-24 RPA3593 TVC → EWR Jul 24, 19:20 UTCJul 24, 19:50 UTC30m
2026-07-24 RPA3541 DCA → EWR Jul 24, 17:15 UTCJul 24, 17:45 UTC30m
2026-07-24 RPA3402 AVL → EWR Jul 24, 14:20 UTCJul 24, 15:35 UTC1h 15m
2026-07-24 RPA3410 ORD → MSN Jul 24, 12:20 UTCJul 24, 13:10 UTC50m
2026-07-23 RPA3580 SDF → EWR Jul 23, 20:30 UTCJul 23, 21:20 UTC50m
2026-07-23 RPA3629 SDF → EWR Jul 23, 17:05 UTCJul 23, 18:20 UTC1h 15m
2026-07-23 RPA3534 EWR → ROC Jul 23, 14:55 UTCJul 23, 15:35 UTC40m
2026-07-22 RPA3455 CMH → EWR Jul 22, 23:55 UTCJul 23, 00:30 UTC35m
2026-07-22 RPA3440 BUF → EWR Jul 22, 20:15 UTCJul 22, 21:40 UTC1h 25m
2026-07-22 RPA3634 - Jul 22, 17:50 UTCJul 22, 19:00 UTC1h 10m
2026-07-22 RPA3634 ORD → BNA Jul 22, 18:00 UTCJul 22, 18:59 UTC59m
2026-07-22 RPA3507 EWR → DTW Jul 22, 14:55 UTCJul 22, 16:45 UTC1h 50m
2026-07-22 RPA3425 ORD → ROC Jul 22, 12:11 UTCJul 22, 13:11 UTC1h 0m
2026-07-22 RPA3425 ORD → ROC Jul 22, 12:00 UTCJul 22, 13:10 UTC1h 10m
2026-07-22 RPA3475 - Jul 22, 02:40 UTCJul 22, 03:25 UTC45m
2026-07-22 RPA3444 EWR → GSO Jul 22, 00:00 UTCJul 22, 01:10 UTC1h 10m
2026-07-21 RPA3570 CHS → EWR Jul 21, 22:10 UTCJul 21, 22:55 UTC45m
2026-07-21 RPA3442 IND → EWR Jul 21, 17:50 UTCJul 21, 20:00 UTC2h 10m
2026-07-21 RPA3442 IND → EWR Jul 21, 17:58 UTCJul 21, 19:42 UTC1h 44m
2026-07-21 RPA3504 EWR → EYW Jul 21, 15:05 UTCJul 21, 16:25 UTC1h 20m
2026-07-21 RPA3504 EWR → EYW Jul 21, 14:25 UTCJul 21, 16:26 UTC2h 1m
2026-07-21 RPA3435 EWR → PHL Jul 21, 11:55 UTCJul 21, 12:55 UTC1h 0m
2026-07-21 RPA3515 PVD → EWR Jul 21, 03:15 UTCJul 21, 04:15 UTC1h 0m
2026-07-21 RPA3466 EWR → PWM Jul 21, 00:55 UTCJul 21, 01:55 UTC1h 0m
2026-07-20 RPA3453 GSP → EWR Jul 20, 22:40 UTCJul 20, 23:40 UTC1h 0m
2026-07-20 RPA3695 SAT → EWR Jul 20, 17:30 UTCJul 20, 19:25 UTC1h 55m
2026-07-20 RPA3649 EWR → MSY Jul 20, 14:15 UTCJul 20, 16:30 UTC2h 15m
2026-07-20 RPA3489 EWR → CLT Jul 20, 12:15 UTCJul 20, 13:20 UTC1h 5m
2026-07-19 RPA3532 BNA → EWR Jul 19, 23:42 UTCJul 20, 00:15 UTC33m
2026-07-19 RPA3532 BNA → EWR Jul 19, 23:30 UTCJul 20, 00:15 UTC45m
2026-07-19 RPA3575 GSP → EWR Jul 19, 20:30 UTCJul 19, 21:35 UTC1h 5m
2026-07-19 RPA3422 ORD → CLE Jul 19, 15:04 UTCJul 19, 15:37 UTC33m
2026-07-19 RPA3422 ORD → CLE Jul 19, 14:50 UTCJul 19, 15:40 UTC50m
2026-07-19 RPA3600 YUL → ORD Jul 19, 10:35 UTCJul 19, 12:15 UTC1h 40m

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 N731YX page for operator, model, and routing details .

Mode-S A9D0FE frequently asked

What is Mode-S code A9D0FE?
A9D0FE is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N731YX.
Where is Mode-S A9D0FE registered?
Mode-S code A9D0FE 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 A9D0FE broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:25 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A9D0FE, octal 52350376, decimal 11,129,086.
What flights does A9D0FE operate?
Mode-S A9D0FE has broadcast 20 distinct callsigns, including RPA3628, RPA3545, RPA3425, RPA3402, RPA3422.