Apparatus

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sensors Mode-S transponder

AA3646

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N757YX · EMBRAER ERJ-170-200 (long wing) · operated by REPUBLIC AIRWAYS INC

Hex
AA3646
Octal
52433106
Decimal
11,155,014
Country
US
Tail
N757YX
Type
E75L
No current signal · last broadcast Jul 26, 21:25 UTC
Flights observed
577
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:25 UTC

Last known position

Most recent position reported by Mode-S AA3646.

Country allocation

The ICAO 24-bit address AA3646 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
RPA3553 Republic Airlines 9 2026-07-18
RPA3561 - 7 2026-07-04
RPA3643 - 6 2026-07-02
RPA3628 - 6 2026-07-13
RPA3526 - 6 2026-07-04
RPA3401 Republic Airlines 6 2026-06-09
RPA3682 Republic Airlines 5 2026-07-23
RPA3669 Republic Airlines 5 2026-07-19
RPA3620 - 5 2026-06-23
RPA3617 Republic Airlines 5 2026-06-24
RPA3551 Republic Airlines 5 2026-05-11
RPA3513 - 5 2026-06-28
RPA3502 - 5 2026-07-15
RPA3494 - 5 2026-07-14
RPA3467 Republic Airlines 5 2026-07-24
RPA3442 - 5 2026-07-06
RPA3441 Republic Airlines 5 2026-05-13
RPA3715 - 4 2026-07-14
RPA3714 Republic Airlines 4 2026-06-08
RPA3694 Republic Airlines 4 2026-07-04

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 RPA3542 YYZ → EWR Jul 26, 19:20 UTCJul 26, 21:25 UTC2h 5m
2026-07-26 RPA3581 RDU → EWR Jul 26, 16:10 UTCJul 26, 17:40 UTC1h 30m
2026-07-26 RPA3661 IAD → EWR Jul 26, 11:25 UTCJul 26, 12:10 UTC45m
2026-07-25 RPA3455 CMH → EWR Jul 25, 23:30 UTCJul 26, 00:00 UTC30m
2026-07-25 RPA3426 EYW → EWR Jul 25, 19:50 UTCJul 25, 22:00 UTC2h 10m
2026-07-25 RPA3426 EYW → EWR Jul 25, 19:25 UTCJul 25, 21:28 UTC2h 3m
2026-07-25 RPA3487 YYZ → EWR Jul 25, 16:50 UTCJul 25, 18:10 UTC1h 20m
2026-07-25 RPA3636 GSP → EWR Jul 25, 14:00 UTCJul 25, 15:00 UTC1h 0m
2026-07-25 RPA3515 PVD → EWR Jul 25, 03:00 UTCJul 25, 04:00 UTC1h 0m
2026-07-25 RPA3515 PVD → EWR Jul 25, 02:58 UTCJul 25, 03:59 UTC1h 1m
2026-07-25 RPA3466 EWR → PWM Jul 25, 01:05 UTCJul 25, 01:55 UTC50m
2026-07-24 RPA3453 GSP → EWR Jul 24, 22:35 UTCJul 24, 23:30 UTC55m
2026-07-24 RPA3530 EWR → SAV Jul 24, 19:10 UTCJul 24, 20:25 UTC1h 15m
2026-07-24 RPA3530 EWR → SAV Jul 24, 19:03 UTCJul 24, 20:22 UTC1h 19m
2026-07-24 RPA3446 CLT → EWR Jul 24, 16:10 UTCJul 24, 17:45 UTC1h 35m
2026-07-24 RPA3467 CMH → EWR Jul 24, 13:35 UTCJul 24, 14:50 UTC1h 15m
2026-07-23 RPA3674 IAD → YYZ Jul 23, 23:30 UTCJul 24, 00:20 UTC50m
2026-07-23 RPA3484 - Jul 23, 20:35 UTCJul 23, 21:30 UTC55m
2026-07-23 RPA3554 - Jul 23, 18:25 UTCJul 23, 19:10 UTC45m
2026-07-23 RPA3663 EWR → ROC Jul 23, 14:55 UTCJul 23, 16:45 UTC1h 50m
2026-07-23 RPA3612 - Jul 23, 12:35 UTCJul 23, 13:45 UTC1h 10m
2026-07-23 RPA3656 PHL → EWR Jul 23, 10:24 UTCJul 23, 10:58 UTC34m
2026-07-23 RPA3656 PHL → EWR Jul 23, 10:15 UTCJul 23, 11:10 UTC55m
2026-07-23 RPA3682 IND → EWR Jul 23, 03:35 UTCJul 23, 04:15 UTC40m
2026-07-23 RPA3682 IND → EWR Jul 23, 03:25 UTCJul 23, 04:10 UTC45m
2026-07-23 RPA3543 HAV → EWR Jul 23, 00:53 UTCJul 23, 02:25 UTC1h 32m
2026-07-23 RPA3543 HAV → EWR Jul 23, 01:00 UTCJul 23, 02:25 UTC1h 25m
2026-07-22 RPA3615 ORF → EWR Jul 22, 22:10 UTCJul 22, 23:15 UTC1h 5m
2026-07-22 RPA3615 ORF → EWR Jul 22, 20:20 UTCJul 22, 23:14 UTC2h 54m
2026-07-22 RPA3413 EWR → CMH Jul 22, 17:12 UTCJul 22, 18:20 UTC1h 8m
2026-07-22 RPA3413 EWR → CMH Jul 22, 17:05 UTCJul 22, 18:25 UTC1h 20m
2026-07-22 RPA3552 IAD → BOS Jul 22, 14:15 UTCJul 22, 15:20 UTC1h 5m
2026-07-21 RPA3671 YYZ → IAD Jul 21, 17:08 UTCJul 21, 18:36 UTC1h 28m
2026-07-21 RPA3671 YYZ → IAD Jul 21, 17:25 UTCJul 21, 18:35 UTC1h 10m
2026-07-21 RPA3601 - Jul 21, 14:10 UTCJul 21, 15:15 UTC1h 5m
2026-07-21 RPA3600 PHL → EWR Jul 21, 10:30 UTCJul 21, 12:30 UTC2h 0m
2026-07-21 RPA3613 EWR → BTV Jul 21, 00:46 UTCJul 21, 01:31 UTC45m
2026-07-21 RPA3613 EWR → BTV Jul 21, 00:30 UTCJul 21, 01:30 UTC1h 0m
2026-07-20 RPA3522 GSO → EWR Jul 20, 20:45 UTCJul 20, 23:10 UTC2h 25m
2026-07-20 RPA3528 IAD → MCI Jul 20, 17:15 UTCJul 20, 19:22 UTC2h 7m
2026-07-20 RPA3528 - Jul 20, 17:15 UTCJul 20, 19:20 UTC2h 5m
2026-07-20 RPA3709 IND → EWR Jul 20, 14:25 UTCJul 20, 15:40 UTC1h 15m
2026-07-20 RPA3550 EWR → CLT Jul 20, 12:40 UTCJul 20, 13:15 UTC35m
2026-07-20 RPA3479 - Jul 20, 10:30 UTCJul 20, 11:10 UTC40m
2026-07-19 RPA3669 ROC → EWR Jul 19, 21:40 UTCJul 19, 23:20 UTC1h 40m
2026-07-19 RPA3435 EWR → PHL Jul 19, 20:05 UTCJul 19, 20:40 UTC35m
2026-07-19 RPA3435 EWR → PHL Jul 19, 17:10 UTCJul 19, 19:05 UTC1h 55m
2026-07-18 RPA3553 SAT → EWR Jul 18, 12:10 UTCJul 18, 13:15 UTC1h 5m
2026-07-18 RPA3518 - Jul 18, 00:50 UTCJul 18, 02:45 UTC1h 55m
2026-07-18 RPA3518 GSP → EWR Jul 18, 00:38 UTCJul 18, 02:27 UTC1h 49m

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 N757YX page for operator, model, and routing details .

Mode-S AA3646 frequently asked

What is Mode-S code AA3646?
AA3646 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N757YX.
Where is Mode-S AA3646 registered?
Mode-S code AA3646 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 AA3646 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 AA3646, octal 52433106, decimal 11,155,014.
What flights does AA3646 operate?
Mode-S AA3646 has broadcast 20 distinct callsigns, including RPA3553, RPA3561, RPA3643, RPA3628, RPA3526.