Apparatus

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sensors Mode-S transponder

AA276A

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N753YX · operated by REPUBLIC AIRWAYS INC

Hex
AA276A
Octal
52423552
Decimal
11,151,210
Country
US
Tail
N753YX
Type
E75L
Broadcasting now · callsign RPA3439 · 31,000 ft
Flights observed
636
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:20 UTC

Current position

AA276A is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address AA276A 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
RPA3459 - 8 2026-07-01
RPA3436 Republic Airlines 8 2026-07-19
RPA3707 Republic Airlines 7 2026-07-22
RPA3686 - 7 2026-07-17
RPA3673 Republic Airlines 7 2026-06-06
RPA3432 Republic Airlines 7 2026-06-14
RPA3694 Republic Airlines 6 2026-06-16
RPA3611 - 6 2026-06-30
RPA3559 - 6 2026-06-23
RPA3543 Republic Airlines 6 2026-06-05
RPA3477 - 6 2026-07-08
RPA3705 - 5 2026-06-25
RPA3669 Republic Airlines 5 2026-07-23
RPA3656 - 5 2026-07-13
RPA3647 Republic Airlines 5 2026-07-22
RPA3633 - 5 2026-07-16
RPA3628 - 5 2026-07-19
RPA3620 - 5 2026-07-20
RPA3590 - 5 2026-07-16
RPA3579 - 5 2026-07-07

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 RPA3404 BOS → EWR Jul 26, 20:25 UTCJul 26, 21:15 UTC50m
2026-07-26 RPA3558 PHL → ORD Jul 26, 18:30 UTCJul 26, 19:20 UTC50m
2026-07-26 RPA3591 SDF → EWR Jul 26, 16:45 UTCJul 26, 17:40 UTC55m
2026-07-26 RPA3505 EWR → BGR Jul 26, 12:45 UTCJul 26, 14:00 UTC1h 15m
2026-07-25 RPA3678 GSO → EWR Jul 25, 22:24 UTCJul 26, 00:03 UTC1h 39m
2026-07-25 RPA3678 GSO → EWR Jul 25, 22:10 UTCJul 26, 00:05 UTC1h 55m
2026-07-25 RPA3576 EWR → DTW Jul 25, 17:25 UTCJul 25, 19:35 UTC2h 10m
2026-07-25 RPA3493 PIT → EWR Jul 25, 14:30 UTCJul 25, 15:35 UTC1h 5m
2026-07-25 RPA3498 CMH → EWR Jul 25, 12:15 UTCJul 25, 13:00 UTC45m
2026-07-25 RPA3524 EWR → MKE Jul 25, 09:40 UTCJul 25, 10:35 UTC55m
2026-07-25 RPA3524 EWR → MKE Jul 25, 09:48 UTCJul 25, 10:21 UTC33m
2026-07-24 RPA3481 EWR → YYZ Jul 24, 23:25 UTCJul 25, 00:40 UTC1h 15m
2026-07-24 RPA3469 DTW → EWR Jul 24, 20:05 UTCJul 24, 21:40 UTC1h 35m
2026-07-24 RPA3702 DFW → ORD Jul 24, 18:15 UTCJul 24, 18:50 UTC35m
2026-07-24 RPA3595 SDF → EWR Jul 24, 14:50 UTCJul 24, 16:30 UTC1h 40m
2026-07-24 RPA3595 SDF → EWR Jul 24, 14:45 UTCJul 24, 16:13 UTC1h 28m
2026-07-24 RPA3639 EWR → CMH Jul 24, 12:38 UTCJul 24, 13:19 UTC41m
2026-07-24 RPA3639 EWR → CMH Jul 24, 12:30 UTCJul 24, 13:20 UTC50m
2026-07-24 RPA3626 IAD → LGA Jul 24, 10:15 UTCJul 24, 11:05 UTC50m
2026-07-24 RPA3643 EWR → RDU Jul 24, 03:15 UTCJul 24, 04:05 UTC50m
2026-07-24 RPA3571 EWR → DTW Jul 24, 00:30 UTCJul 24, 02:05 UTC1h 35m
2026-07-23 RPA3443 EWR → DCA Jul 23, 20:20 UTCJul 23, 22:05 UTC1h 45m
2026-07-23 RPA3478 EWR → ILM Jul 23, 17:10 UTCJul 23, 18:45 UTC1h 35m
2026-07-23 RPA3669 ROC → EWR Jul 23, 14:22 UTCJul 23, 15:39 UTC1h 17m
2026-07-23 RPA3669 ROC → EWR Jul 23, 14:00 UTCJul 23, 15:45 UTC1h 45m
2026-07-23 RPA3703 YQB → EWR Jul 23, 10:10 UTCJul 23, 11:30 UTC1h 20m
2026-07-23 RPA3625 EWR → ROC Jul 23, 01:25 UTCJul 23, 02:30 UTC1h 5m
2026-07-22 RPA3476 EYW → EWR Jul 22, 22:55 UTCJul 22, 23:50 UTC55m
2026-07-22 RPA3523 MSY → EWR Jul 22, 20:15 UTCJul 22, 21:45 UTC1h 30m
2026-07-22 RPA3494 - Jul 22, 16:30 UTCJul 22, 18:05 UTC1h 35m
2026-07-22 RPA3647 YYZ → EWR Jul 22, 14:35 UTCJul 22, 15:25 UTC50m
2026-07-22 RPA3567 - Jul 22, 11:35 UTCJul 22, 12:55 UTC1h 20m
2026-07-22 RPA3707 RDU → EWR Jul 22, 01:10 UTCJul 22, 01:40 UTC30m
2026-07-21 RPA3659 GSO → EWR Jul 21, 21:30 UTCJul 21, 23:15 UTC1h 45m
2026-07-21 RPA3457 EWR → ATL Jul 21, 16:25 UTCJul 21, 18:05 UTC1h 40m
2026-07-21 RPA3696 EWR → CLT Jul 21, 13:15 UTCJul 21, 14:25 UTC1h 10m
2026-07-20 RPA3415 - Jul 20, 22:55 UTCJul 21, 00:30 UTC1h 34m
2026-07-20 RPA3620 - Jul 20, 20:05 UTCJul 20, 21:00 UTC55m
2026-07-20 RPA3535 EWR → JAX Jul 20, 17:05 UTCJul 20, 18:11 UTC1h 6m
2026-07-20 RPA3500 EWR → MKE Jul 20, 14:25 UTCJul 20, 15:30 UTC1h 5m
2026-07-20 RPA3672 RDU → EWR Jul 20, 11:50 UTCJul 20, 13:20 UTC1h 30m
2026-07-20 RPA3672 RDU → EWR Jul 20, 11:52 UTCJul 20, 13:04 UTC1h 12m
2026-07-20 RPA3303 IAD → EWR Jul 20, 03:15 UTCJul 20, 03:55 UTC40m
2026-07-19 RPA3628 - Jul 19, 23:15 UTCJul 20, 01:25 UTC2h 10m
2026-07-19 RPA3436 CLT → EWR Jul 19, 19:30 UTCJul 19, 21:55 UTC2h 25m
2026-07-19 RPA3400 EWR → TVC Jul 19, 13:10 UTCJul 19, 16:30 UTC3h 20m
2026-07-18 RPA3431 BUF → EWR Jul 18, 10:20 UTCJul 18, 13:35 UTC3h 15m
2026-07-18 RPA3491 ORF → EWR Jul 18, 01:50 UTCJul 18, 03:05 UTC1h 16m
2026-07-17 RPA3478 EWR → ILM Jul 17, 22:15 UTCJul 17, 23:14 UTC1h 0m
2026-07-17 RPA3686 - Jul 17, 19:25 UTCJul 17, 20:29 UTC1h 5m

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 N753YX page for operator, model, and routing details .

Mode-S AA276A frequently asked

What is Mode-S code AA276A?
AA276A is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N753YX.
Where is Mode-S AA276A registered?
Mode-S code AA276A 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 AA276A broadcasting right now?
Yes. Mode-S AA276A is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AA276A, octal 52423552, decimal 11,151,210.
What flights does AA276A operate?
Mode-S AA276A has broadcast 20 distinct callsigns, including RPA3459, RPA3436, RPA3707, RPA3686, RPA3673.