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sensors Mode-S transponder

A9B85B

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N725YX · EMBRAER ERJ-170-200 (long wing) · operated by REPUBLIC AIRWAYS INC

Hex
A9B85B
Octal
52334133
Decimal
11,122,779
Country
US
Tail
N725YX
Type
E75L
No current signal · last broadcast 3h ago
Flights observed
550
Distinct callsigns
20
Country
US
Last broadcast
3h ago

Last known position

Most recent position reported by Mode-S A9B85B.

Country allocation

The ICAO 24-bit address A9B85B 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
RPA3596 - 8 2026-07-12
RPA3425 - 8 2026-06-24
RPA3638 - 7 2026-07-12
RPA3593 Republic Airlines 7 2026-05-21
RPA3445 - 7 2026-06-13
RPA3673 - 6 2026-07-02
RPA3619 - 6 2026-06-23
RPA3437 Republic Airlines 6 2026-06-07
RPA3422 - 6 2026-06-22
RPA3705 Republic Airlines 5 2026-06-09
RPA3652 Republic Airlines 5 2026-05-28
RPA3646 - 5 2026-06-21
RPA3612 - 5 2026-06-26
RPA3607 - 5 2026-06-16
RPA3555 Republic Airlines 5 2026-05-27
RPA3546 - 5 2026-06-24
RPA3544 Republic Airlines 5 2026-06-11
RPA3542 - 5 2026-06-18
RPA3518 - 5 2026-07-11
RPA3486 Republic Airlines 5 2026-05-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 RPA3625 EWR → YQB Jul 14, 01:16 UTCJul 14, 02:13 UTC57m
2026-07-14 RPA3625 - Jul 14, 01:00 UTCJul 14, 02:15 UTC1h 15m
2026-07-13 RPA3476 - Jul 13, 22:35 UTCJul 13, 23:25 UTC50m
2026-07-13 RPA3523 - Jul 13, 20:05 UTCJul 13, 21:45 UTC1h 40m
2026-07-13 RPA3523 ORD → RIC Jul 13, 20:05 UTCJul 13, 21:40 UTC1h 35m
2026-07-13 RPA3494 ROC → ORD Jul 13, 16:40 UTCJul 13, 17:27 UTC47m
2026-07-13 RPA3494 - Jul 13, 16:25 UTCJul 13, 18:10 UTC1h 45m
2026-07-13 RPA3647 EWR → ROC Jul 13, 14:30 UTCJul 13, 15:20 UTC50m
2026-07-12 RPA3571 IND → EWR Jul 12, 23:00 UTCJul 13, 00:40 UTC1h 40m
2026-07-12 RPA3571 IND → EWR Jul 12, 23:13 UTCJul 13, 00:29 UTC1h 16m
2026-07-12 RPA3443 EWR → IND Jul 12, 20:18 UTCJul 12, 21:53 UTC1h 35m
2026-07-12 RPA3443 EWR → IND Jul 12, 20:15 UTCJul 12, 21:55 UTC1h 40m
2026-07-12 RPA3596 - Jul 12, 17:40 UTCJul 12, 19:05 UTC1h 25m
2026-07-12 RPA3638 EWR → CMH Jul 12, 15:00 UTCJul 12, 15:59 UTC59m
2026-07-12 RPA3638 EWR → CMH Jul 12, 14:50 UTCJul 12, 16:01 UTC1h 10m
2026-07-12 RPA3642 - Jul 12, 11:05 UTCJul 12, 13:05 UTC2h 0m
2026-07-12 RPA3563 EWR → MEM Jul 12, 02:15 UTCJul 12, 04:35 UTC2h 20m
2026-07-11 RPA3714 - Jul 11, 23:45 UTCJul 12, 00:55 UTC1h 10m
2026-07-11 RPA3589 - Jul 11, 20:30 UTCJul 11, 22:25 UTC1h 55m
2026-07-11 RPA3589 EWR → MYR Jul 11, 20:16 UTCJul 11, 22:12 UTC1h 56m
2026-07-11 RPA3400 AUS → EWR Jul 11, 15:20 UTCJul 11, 18:40 UTC3h 20m
2026-07-11 RPA3400 AUS → EWR Jul 11, 15:20 UTCJul 11, 18:31 UTC3h 11m
2026-07-11 RPA3431 EWR → AUS Jul 11, 10:25 UTCJul 11, 13:45 UTC3h 20m
2026-07-11 RPA3518 GSP → EWR Jul 11, 02:05 UTCJul 11, 03:40 UTC1h 35m
2026-07-10 RPA3584 - Jul 10, 21:30 UTCJul 10, 23:00 UTC1h 30m
2026-07-10 RPA3415 - Jul 10, 19:00 UTCJul 10, 19:50 UTC50m
2026-07-10 RPA3704 - Jul 10, 15:50 UTCJul 10, 17:20 UTC1h 30m
2026-07-10 RPA3539 - Jul 10, 12:15 UTCJul 10, 12:55 UTC40m
2026-07-09 RPA3455 ORD → IND Jul 9, 23:30 UTCJul 10, 00:05 UTC35m
2026-07-09 RPA3440 BNA → ORD Jul 9, 20:20 UTCJul 9, 21:30 UTC1h 10m
2026-07-09 RPA3634 - Jul 9, 17:45 UTCJul 9, 18:50 UTC1h 5m
2026-07-09 RPA3634 ORD → BNA Jul 9, 18:00 UTCJul 9, 18:49 UTC49m
2026-07-09 RPA3534 - Jul 9, 15:00 UTCJul 9, 15:50 UTC50m
2026-07-07 RPA4095 EWR → IND Jul 7, 14:11 UTCJul 7, 16:14 UTC2h 3m
2026-07-05 RPA3611 - Jul 5, 20:05 UTCJul 5, 21:15 UTC1h 10m
2026-07-05 RPA3495 IAD → DTW Jul 5, 17:15 UTCJul 5, 18:28 UTC1h 13m
2026-07-05 RPA3495 IAD → DTW Jul 5, 17:20 UTCJul 5, 18:30 UTC1h 10m
2026-07-05 RPA3527 - Jul 5, 02:50 UTCJul 5, 04:30 UTC1h 40m
2026-07-05 RPA3527 YQB → IAD Jul 5, 02:13 UTCJul 5, 04:24 UTC2h 11m
2026-07-04 RPA3574 - Jul 4, 18:50 UTCJul 4, 20:05 UTC1h 15m
2026-07-04 RPA3684 - Jul 4, 15:45 UTCJul 4, 17:25 UTC1h 40m
2026-07-04 RPA3604 - Jul 4, 13:30 UTCJul 4, 15:00 UTC1h 30m
2026-07-04 RPA3604 - Jul 4, 10:00 UTCJul 4, 11:00 UTC1h 0m
2026-07-04 RPA3627 - Jul 4, 03:15 UTCJul 4, 04:00 UTC45m
2026-07-04 RPA3680 BGR → EWR Jul 4, 01:00 UTCJul 4, 02:05 UTC1h 5m
2026-07-03 RPA3454 LDJ → BGR Jul 3, 21:10 UTCJul 3, 22:15 UTC1h 5m
2026-07-03 RPA3471 - Jul 3, 18:00 UTCJul 3, 19:40 UTC1h 40m
2026-07-03 RPA3513 - Jul 3, 15:25 UTCJul 3, 16:50 UTC1h 25m
2026-07-03 RPA3685 CVG → EWR Jul 3, 11:50 UTCJul 3, 13:20 UTC1h 30m
2026-07-03 RPA3667 EWR → CVG Jul 3, 01:20 UTCJul 3, 02:50 UTC1h 30m

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 N725YX page for operator, model, and routing details .

Mode-S A9B85B frequently asked

What is Mode-S code A9B85B?
A9B85B is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N725YX.
Where is Mode-S A9B85B registered?
Mode-S code A9B85B 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 A9B85B broadcasting right now?
No active broadcast right now. Last signal was 3h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A9B85B, octal 52334133, decimal 11,122,779.
What flights does A9B85B operate?
Mode-S A9B85B has broadcast 20 distinct callsigns, including RPA3596, RPA3425, RPA3638, RPA3593, RPA3445.