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sensors Mode-S transponder

AA23B3

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N752YX · EMBRAER ERJ-170-200 (long wing) · operated by UNITED AIRLINES INC

Hex
AA23B3
Octal
52421663
Decimal
11,150,259
Country
US
Tail
N752YX
Type
E75L
No current signal · last broadcast Jul 26, 22:45 UTC
Flights observed
676
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:45 UTC

Last known position

Most recent position reported by Mode-S AA23B3.

Country allocation

The ICAO 24-bit address AA23B3 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
RPA3633 - 9 2026-07-20
RPA3572 Republic Airlines 9 2026-07-25
RPA3417 - 9 2026-07-15
RPA3707 - 8 2026-07-17
RPA3706 Republic Airlines 8 2026-05-17
RPA3485 Republic Airlines 8 2026-06-12
RPA3422 - 8 2026-07-01
RPA3418 Republic Airlines 8 2026-06-06
RPA3406 - 8 2026-07-02
RPA3461 - 7 2026-07-16
RPA3445 - 7 2026-06-26
RPA3427 Republic Airlines 7 2026-07-24
RPA3684 Republic Airlines 6 2026-06-16
RPA3588 - 6 2026-07-14
RPA3480 - 6 2026-06-27
RPA3479 - 6 2026-07-17
RPA3469 Republic Airlines 6 2026-07-02
RPA3431 - 6 2026-07-13
RPA3409 - 6 2026-07-04
RPA3408 - 6 2026-07-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 RPA3585 IND → EWR Jul 26, 21:55 UTCJul 26, 22:45 UTC50m
2026-07-26 RPA3459 CVG → EWR Jul 26, 18:30 UTCJul 26, 19:55 UTC1h 25m
2026-07-26 RPA3685 YYZ → EWR Jul 26, 16:05 UTCJul 26, 16:45 UTC40m
2026-07-26 RPA3467 CMH → EWR Jul 26, 13:25 UTCJul 26, 14:40 UTC1h 15m
2026-07-25 RPA3545 EWR → CMH Jul 25, 22:05 UTCJul 25, 23:15 UTC1h 10m
2026-07-25 RPA3415 AVL → EWR Jul 25, 19:35 UTCJul 25, 20:35 UTC1h 0m
2026-07-25 RPA3704 EWR → DCA Jul 25, 15:55 UTCJul 25, 17:30 UTC1h 35m
2026-07-25 RPA3544 EWR → YYZ Jul 25, 13:50 UTCJul 25, 14:35 UTC45m
2026-07-25 RPA3544 EWR → YYZ Jul 25, 13:17 UTCJul 25, 14:26 UTC1h 9m
2026-07-25 RPA3572 EWR → YYZ Jul 25, 02:45 UTCJul 25, 03:15 UTC30m
2026-07-25 RPA3572 EWR → YYZ Jul 25, 02:58 UTCJul 25, 03:43 UTC45m
2026-07-25 RPA3444 EWR → GSO Jul 25, 00:05 UTCJul 25, 01:00 UTC55m
2026-07-25 RPA3444 EWR → GSO Jul 25, 00:12 UTCJul 25, 00:49 UTC37m
2026-07-24 RPA3570 CHS → EWR Jul 24, 22:15 UTCJul 24, 23:05 UTC50m
2026-07-24 RPA3427 EWR → CVG Jul 24, 19:35 UTCJul 24, 20:10 UTC35m
2026-07-24 RPA3427 EWR → CVG Jul 24, 19:34 UTCJul 24, 19:57 UTC23m
2026-07-24 RPA3402 AVL → EWR Jul 24, 17:00 UTCJul 24, 18:20 UTC1h 20m
2026-07-24 RPA3656 PHL → EWR Jul 24, 13:50 UTCJul 24, 14:40 UTC50m
2026-07-24 RPA3656 PHL → EWR Jul 24, 13:44 UTCJul 24, 14:39 UTC55m
2026-07-24 RPA3301 ORF → EWR Jul 24, 11:50 UTCJul 24, 12:55 UTC1h 5m
2026-07-23 RPA3626 EWR → ORF Jul 23, 13:05 UTCJul 23, 14:05 UTC1h 0m
2026-07-23 RPA3626 ROC → EWR Jul 23, 10:05 UTCJul 23, 10:55 UTC50m
2026-07-23 RPA3643 EWR → RDU Jul 23, 02:55 UTCJul 23, 03:40 UTC45m
2026-07-22 RPA3571 EWR → DTW Jul 22, 23:10 UTCJul 23, 00:40 UTC1h 30m
2026-07-22 RPA3443 EWR → DCA Jul 22, 20:12 UTCJul 22, 21:48 UTC1h 36m
2026-07-22 RPA3443 EWR → DCA Jul 22, 20:00 UTCJul 22, 21:50 UTC1h 50m
2026-07-22 RPA3478 EWR → ILM Jul 22, 17:05 UTCJul 22, 18:35 UTC1h 30m
2026-07-22 RPA3478 EWR → ILM Jul 22, 17:09 UTCJul 22, 18:36 UTC1h 27m
2026-07-21 RPA3309 CVG → IND Jul 21, 17:30 UTCJul 21, 18:10 UTC40m
2026-07-21 RPA3307 ITH → IND Jul 21, 14:40 UTCJul 21, 16:25 UTC1h 45m
2026-07-21 RPA3626 EWR → ORF Jul 21, 12:56 UTCJul 21, 13:56 UTC1h 0m
2026-07-21 RPA3626 - Jul 21, 13:00 UTCJul 21, 14:00 UTC1h 0m
2026-07-21 RPA3697 - Jul 21, 10:20 UTCJul 21, 11:20 UTC1h 0m
2026-07-21 RPA3697 YOW → EWR Jul 21, 10:29 UTCJul 21, 11:17 UTC48m
2026-07-21 RPA3506 EWR → YOW Jul 21, 01:07 UTCJul 21, 01:53 UTC46m
2026-07-21 RPA3506 - Jul 21, 00:55 UTCJul 21, 01:55 UTC1h 0m
2026-07-20 RPA3633 - Jul 20, 21:55 UTCJul 20, 23:00 UTC1h 5m
2026-07-20 RPA3616 EWR → IND Jul 20, 19:30 UTCJul 20, 20:30 UTC1h 0m
2026-07-20 RPA3701 GSP → EWR Jul 20, 17:15 UTCJul 20, 18:35 UTC1h 20m
2026-07-20 RPA3408 EWR → BGR Jul 20, 03:35 UTCJul 20, 04:35 UTC1h 0m
2026-07-19 RPA3564 CMH → EWR Jul 19, 23:05 UTCJul 20, 01:15 UTC2h 10m
2026-07-19 RPA3556 CVG → ORD Jul 19, 19:25 UTCJul 19, 20:45 UTC1h 20m
2026-07-19 RPA3556 CVG → ORD Jul 19, 19:03 UTCJul 19, 21:37 UTC2h 34m
2026-07-18 RPA3652 CVG → EWR Jul 18, 10:05 UTCJul 18, 11:20 UTC1h 15m
2026-07-17 RPA3586 EWR → GSO Jul 17, 22:45 UTCJul 18, 00:04 UTC1h 20m
2026-07-17 RPA3611 - Jul 17, 19:49 UTCJul 17, 20:55 UTC1h 5m
2026-07-17 RPA3495 IAD → DTW Jul 17, 17:05 UTCJul 17, 18:10 UTC1h 5m
2026-07-17 RPA3709 - Jul 17, 14:15 UTCJul 17, 15:29 UTC1h 15m
2026-07-17 RPA3550 EWR → CLT Jul 17, 12:50 UTCJul 17, 13:20 UTC30m
2026-07-17 RPA3479 - Jul 17, 10:20 UTCJul 17, 11:04 UTC45m

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 N752YX page for operator, model, and routing details .

Mode-S AA23B3 frequently asked

What is Mode-S code AA23B3?
AA23B3 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N752YX.
Where is Mode-S AA23B3 registered?
Mode-S code AA23B3 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 AA23B3 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:45 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AA23B3, octal 52421663, decimal 11,150,259.
What flights does AA23B3 operate?
Mode-S AA23B3 has broadcast 20 distinct callsigns, including RPA3633, RPA3572, RPA3417, RPA3707, RPA3706.