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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 Jul 26, 22:40 UTC
Flights observed
615
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:40 UTC

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
RPA3445 - 8 2026-07-16
RPA3425 - 8 2026-06-24
RPA3638 - 7 2026-07-12
RPA3593 Republic Airlines 7 2026-05-21
RPA3673 - 6 2026-07-02
RPA3619 - 6 2026-06-23
RPA3611 - 6 2026-07-20
RPA3437 Republic Airlines 6 2026-06-07
RPA3422 - 6 2026-06-22
RPA3418 Republic Airlines 6 2026-07-26
RPA3705 Republic Airlines 5 2026-06-09
RPA3699 Republic Airlines 5 2026-07-22
RPA3652 Republic Airlines 5 2026-05-28
RPA3646 - 5 2026-06-21
RPA3626 - 5 2026-07-22
RPA3620 - 5 2026-07-20
RPA3612 - 5 2026-06-26
RPA3607 - 5 2026-06-16
RPA3555 Republic Airlines 5 2026-05-27

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 RPA3418 DCA → EWR Jul 26, 22:05 UTCJul 26, 22:40 UTC35m
2026-07-26 RPA3442 IND → EWR Jul 26, 17:20 UTCJul 26, 18:55 UTC1h 35m
2026-07-26 RPA3504 EWR → EYW Jul 26, 14:25 UTCJul 26, 15:51 UTC1h 26m
2026-07-26 RPA3504 EWR → EYW Jul 26, 14:25 UTCJul 26, 15:50 UTC1h 25m
2026-07-26 RPA3474 EWR → MYR Jul 26, 11:10 UTCJul 26, 12:25 UTC1h 15m
2026-07-26 RPA3408 DCA → EWR Jul 26, 03:00 UTCJul 26, 04:10 UTC1h 10m
2026-07-26 RPA3565 BNA → EWR Jul 26, 01:20 UTCJul 26, 02:15 UTC55m
2026-07-26 RPA3565 BNA → EWR Jul 26, 00:56 UTCJul 26, 02:12 UTC1h 16m
2026-07-25 RPA3579 CVG → EWR Jul 25, 21:40 UTCJul 25, 22:15 UTC35m
2026-07-24 RPA3637 ROC → EWR Jul 24, 18:50 UTCJul 24, 19:45 UTC55m
2026-07-24 RPA3400 EWR → TVC Jul 24, 16:25 UTCJul 24, 17:30 UTC1h 5m
2026-07-24 RPA3416 GSP → EWR Jul 24, 12:30 UTCJul 24, 13:50 UTC1h 20m
2026-07-23 RPA3545 EWR → CMH Jul 23, 23:10 UTCJul 24, 00:30 UTC1h 20m
2026-07-23 RPA3450 DCA → EWR Jul 23, 19:20 UTCJul 23, 20:30 UTC1h 10m
2026-07-23 RPA3450 DCA → EWR Jul 23, 16:05 UTCJul 23, 18:00 UTC1h 55m
2026-07-23 RPA3497 CHS → EWR Jul 23, 13:50 UTCJul 23, 14:45 UTC55m
2026-07-23 RPA3667 SAV → EWR Jul 23, 01:45 UTCJul 23, 03:30 UTC1h 45m
2026-07-22 RPA3699 EWR → ATL Jul 22, 21:55 UTCJul 22, 23:55 UTC2h 0m
2026-07-22 RPA3650 EWR → MEM Jul 22, 18:22 UTCJul 22, 20:32 UTC2h 10m
2026-07-22 RPA3650 - Jul 22, 18:05 UTCJul 22, 20:25 UTC2h 20m
2026-07-22 RPA3508 ROC → EWR Jul 22, 15:50 UTCJul 22, 16:50 UTC1h 0m
2026-07-22 RPA3626 - Jul 22, 13:10 UTCJul 22, 14:35 UTC1h 25m
2026-07-21 RPA3482 DCA → EWR Jul 21, 11:40 UTCJul 21, 14:00 UTC2h 20m
2026-07-20 RPA3620 EWR → MSN Jul 20, 23:45 UTCJul 21, 01:45 UTC2h 0m
2026-07-20 RPA3611 - Jul 20, 19:40 UTCJul 20, 20:50 UTC1h 10m
2026-07-20 RPA3495 IAD → DTW Jul 20, 17:20 UTCJul 20, 18:30 UTC1h 10m
2026-07-20 RPA3465 DCA → EWR Jul 20, 14:05 UTCJul 20, 15:25 UTC1h 20m
2026-07-20 RPA3665 - Jul 20, 12:15 UTCJul 20, 13:05 UTC50m
2026-07-19 RPA3545 - Jul 19, 21:55 UTCJul 19, 22:50 UTC55m
2026-07-19 RPA3547 EWR → BOS Jul 19, 17:10 UTCJul 19, 18:30 UTC1h 20m
2026-07-19 RPA3590 YUL → IAD Jul 19, 13:39 UTCJul 19, 14:39 UTC1h 0m
2026-07-19 RPA3590 YUL → IAD Jul 19, 13:25 UTCJul 19, 14:45 UTC1h 20m
2026-07-19 RPA3613 EWR → YUL Jul 19, 10:15 UTCJul 19, 11:20 UTC1h 5m
2026-07-19 RPA3613 EWR → YUL Jul 19, 10:28 UTCJul 19, 11:15 UTC47m
2026-07-18 RPA3560 - Jul 18, 13:40 UTCJul 18, 14:40 UTC1h 0m
2026-07-18 RPA3464 ORD → PIT Jul 18, 03:28 UTCJul 18, 04:19 UTC51m
2026-07-18 RPA3464 ORD → PIT Jul 18, 03:20 UTCJul 18, 04:20 UTC1h 0m
2026-07-17 RPA3549 EWR → CLT Jul 17, 23:25 UTCJul 18, 01:34 UTC2h 10m
2026-07-17 RPA3715 EWR → YUL Jul 17, 18:53 UTCJul 17, 19:45 UTC52m
2026-07-17 RPA3715 EWR → YUL Jul 17, 18:44 UTCJul 17, 19:49 UTC1h 5m
2026-07-17 RPA3424 - Jul 17, 15:55 UTCJul 17, 16:59 UTC1h 5m
2026-07-17 RPA7250 EWR → CLE Jul 17, 13:40 UTCJul 17, 14:50 UTC1h 10m
2026-07-17 RPA3458 - Jul 17, 10:55 UTCJul 17, 12:10 UTC1h 15m
2026-07-16 RPA3481 EWR → CMH Jul 16, 23:25 UTCJul 17, 00:40 UTC1h 15m
2026-07-16 RPA3611 - Jul 16, 19:35 UTCJul 16, 20:45 UTC1h 10m
2026-07-16 RPA3611 DTW → EWR Jul 16, 19:37 UTCJul 16, 20:32 UTC55m
2026-07-16 RPA3495 IAD → DTW Jul 16, 17:10 UTCJul 16, 18:15 UTC1h 5m
2026-07-16 RPA3430 - Jul 16, 14:55 UTCJul 16, 15:45 UTC50m
2026-07-16 RPA3514 IAD → BUF Jul 16, 12:40 UTCJul 16, 13:30 UTC50m
2026-07-16 RPA3561 - Jul 16, 10:10 UTCJul 16, 11:20 UTC1h 10m

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 Jul 26, 22:40 UTC.
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, RPA3445, RPA3425, RPA3638, RPA3593.