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sensors Mode-S transponder

AA72B1

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N772YX · operated by REPUBLIC AIRWAYS INC

Hex
AA72B1
Octal
52471261
Decimal
11,170,481
Country
US
Tail
N772YX
Type
E75L
No current signal · last broadcast 1h ago
Flights observed
600
Distinct callsigns
20
Country
US
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S AA72B1.

Country allocation

The ICAO 24-bit address AA72B1 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
RPA3544 - 8 2026-07-12
RPA3707 - 7 2026-06-26
RPA3700 - 7 2026-06-30
RPA3694 Republic Airlines 7 2026-07-01
RPA3690 - 7 2026-07-12
RPA3661 Republic Airlines 6 2026-06-10
RPA3653 Republic Airlines 6 2026-06-13
RPA3621 Republic Airlines 6 2026-06-04
RPA3594 - 6 2026-07-01
RPA3500 Republic Airlines 6 2026-06-17
RPA3491 - 6 2026-07-15
RPA3454 Republic Airlines 6 2026-06-10
RPA3406 - 6 2026-06-28
RPA3714 Republic Airlines 5 2026-05-04
RPA3640 - 5 2026-06-28
RPA3625 - 5 2026-06-15
RPA3606 - 5 2026-06-30
RPA3602 - 5 2026-07-10
RPA3589 Republic Airlines 5 2026-05-14
RPA3583 - 5 2026-07-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-15 RPA3491 - Jul 15, 00:30 UTCJul 15, 01:40 UTC1h 10m
2026-07-14 RPA3478 EWR → ORF Jul 14, 21:55 UTCJul 14, 22:45 UTC49m
2026-07-14 RPA3596 - Jul 14, 17:20 UTCJul 14, 18:40 UTC1h 20m
2026-07-14 RPA3638 - Jul 14, 14:45 UTCJul 14, 15:50 UTC1h 5m
2026-07-14 RPA3503 - Jul 14, 10:55 UTCJul 14, 12:30 UTC1h 35m
2026-07-14 RPA3428 - Jul 14, 01:10 UTCJul 14, 02:30 UTC1h 20m
2026-07-13 RPA3710 CMH → EWR Jul 13, 21:15 UTCJul 13, 22:45 UTC1h 30m
2026-07-13 RPA3710 CMH → EWR Jul 13, 21:18 UTCJul 13, 22:49 UTC1h 31m
2026-07-13 RPA3492 EWR → CMH Jul 13, 18:30 UTCJul 13, 19:40 UTC1h 10m
2026-07-13 RPA3583 YUL → EWR Jul 13, 15:47 UTCJul 13, 16:37 UTC50m
2026-07-13 RPA3583 YUL → EWR Jul 13, 15:35 UTCJul 13, 16:40 UTC1h 5m
2026-07-13 RPA3536 ORD → YUL Jul 13, 12:30 UTCJul 13, 14:15 UTC1h 45m
2026-07-12 RPA3499 - Jul 12, 20:01 UTCJul 12, 22:50 UTC2h 50m
2026-07-12 RPA3690 ORD → EYW Jul 12, 16:28 UTCJul 12, 19:01 UTC2h 33m
2026-07-12 RPA3690 - Jul 12, 16:25 UTCJul 12, 18:55 UTC2h 30m
2026-07-12 RPA3544 - Jul 12, 13:50 UTCJul 12, 14:01 UTC10m
2026-07-12 RPA3544 - Jul 12, 13:10 UTCJul 12, 14:01 UTC50m
2026-07-12 RPA3544 TVC → ORD Jul 12, 13:17 UTCJul 12, 13:35 UTC18m
2026-07-12 RPA3572 - Jul 12, 03:05 UTCJul 12, 03:40 UTC35m
2026-07-11 RPA3549 - Jul 11, 21:30 UTCJul 11, 23:20 UTC1h 50m
2026-07-11 RPA3549 YUL → ORD Jul 11, 21:21 UTCJul 11, 23:11 UTC1h 50m
2026-07-11 RPA3715 EWR → YUL Jul 11, 18:53 UTCJul 11, 19:47 UTC54m
2026-07-11 RPA3715 EWR → YUL Jul 11, 18:40 UTCJul 11, 19:50 UTC1h 10m
2026-07-11 RPA3623 - Jul 11, 15:20 UTCJul 11, 17:05 UTC1h 45m
2026-07-11 RPA3623 SDF → EWR Jul 11, 15:27 UTCJul 11, 16:59 UTC1h 32m
2026-07-11 RPA3526 - Jul 11, 13:10 UTCJul 11, 14:30 UTC1h 20m
2026-07-11 RPA3438 - Jul 11, 11:10 UTCJul 11, 12:20 UTC1h 10m
2026-07-10 RPA3415 - Jul 10, 23:10 UTCJul 11, 00:55 UTC1h 45m
2026-07-10 RPA3545 YUL → EWR Jul 10, 19:55 UTCJul 10, 20:50 UTC55m
2026-07-10 RPA3547 IAD → YUL Jul 10, 17:15 UTCJul 10, 18:35 UTC1h 20m
2026-07-10 RPA3590 YUL → IAD Jul 10, 13:45 UTCJul 10, 15:10 UTC1h 25m
2026-07-10 RPA3602 IAD → YUL Jul 10, 11:25 UTCJul 10, 12:40 UTC1h 15m
2026-07-10 RPA3637 YYZ → IAD Jul 10, 00:25 UTCJul 10, 01:25 UTC1h 0m
2026-07-09 RPA3400 EWR → YYZ Jul 9, 16:21 UTCJul 9, 17:15 UTC54m
2026-07-09 RPA3400 EWR → YYZ Jul 9, 16:20 UTCJul 9, 17:25 UTC1h 5m
2026-07-09 RPA3409 - Jul 9, 13:25 UTCJul 9, 14:40 UTC1h 15m
2026-07-08 RPA3586 - Jul 8, 22:50 UTCJul 9, 00:05 UTC1h 15m
2026-07-08 RPA3611 - Jul 8, 19:50 UTCJul 8, 21:05 UTC1h 15m
2026-07-08 RPA3495 IAD → DTW Jul 8, 17:15 UTCJul 8, 18:09 UTC54m
2026-07-08 RPA3495 IAD → DTW Jul 8, 17:15 UTCJul 8, 18:10 UTC55m
2026-07-08 RPA3709 - Jul 8, 14:15 UTCJul 8, 15:35 UTC1h 20m
2026-07-08 RPA3550 - Jul 8, 12:40 UTCJul 8, 13:10 UTC30m
2026-07-08 RPA3479 IND → ORD Jul 8, 10:20 UTCJul 8, 10:32 UTC12m
2026-07-08 RPA3479 IND → ORD Jul 8, 10:05 UTCJul 8, 10:45 UTC40m
2026-07-08 RPA3705 - Jul 8, 01:05 UTCJul 8, 02:15 UTC1h 10m
2026-07-08 RPA3705 EWR → IND Jul 8, 01:03 UTCJul 8, 02:40 UTC1h 37m
2026-07-07 RPA3501 - Jul 7, 22:05 UTCJul 8, 00:00 UTC1h 55m
2026-07-07 RPA3501 GRR → EWR Jul 7, 21:12 UTCJul 7, 23:56 UTC2h 44m
2026-07-07 RPA3419 EWR → GRR Jul 7, 18:10 UTCJul 7, 19:45 UTC1h 35m
2026-07-07 RPA3583 - Jul 7, 15:35 UTCJul 7, 16:40 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 N772YX page for operator, model, and routing details .

Mode-S AA72B1 frequently asked

What is Mode-S code AA72B1?
AA72B1 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N772YX.
Where is Mode-S AA72B1 registered?
Mode-S code AA72B1 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 AA72B1 broadcasting right now?
No active broadcast right now. Last signal was 1h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AA72B1, octal 52471261, decimal 11,170,481.
What flights does AA72B1 operate?
Mode-S AA72B1 has broadcast 20 distinct callsigns, including RPA3544, RPA3707, RPA3700, RPA3694, RPA3690.