Apparatus

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sensors Mode-S transponder

AA127E

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N748YX · EMBRAER ERJ-170-200 (long wing) · operated by UNITED AIRLINES INC

Hex
AA127E
Octal
52411176
Decimal
11,145,854
Country
US
Tail
N748YX
Type
E75L
No current signal · last broadcast Jul 26, 21:15 UTC
Flights observed
680
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:15 UTC

Last known position

Most recent position reported by Mode-S AA127E.

Country allocation

The ICAO 24-bit address AA127E 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
RPA3488 - 10 2026-07-15
RPA3685 - 9 2026-07-07
RPA3596 Republic Airlines 8 2026-07-24
RPA3618 Republic Airlines 7 2026-04-17
RPA3591 - 7 2026-07-13
RPA3586 - 7 2026-07-06
RPA3532 - 7 2026-06-22
RPA3451 - 7 2026-07-05
RPA3693 - 6 2026-07-16
RPA3686 Republic Airlines 6 2026-06-06
RPA3669 - 6 2026-07-04
RPA3619 Republic Airlines 6 2026-07-21
RPA3577 - 6 2026-06-15
RPA3537 - 6 2026-07-08
RPA3516 Republic Airlines 6 2026-07-26
RPA3443 - 6 2026-07-03
RPA3702 - 5 2026-07-11
RPA3673 Republic Airlines 5 2026-07-25
RPA3654 Republic Airlines 5 2026-05-14
RPA3652 Republic Airlines 5 2026-06-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 RPA3484 IAD → BTV Jul 26, 20:25 UTCJul 26, 21:15 UTC50m
2026-07-26 RPA3554 EWR → CLT Jul 26, 18:25 UTCJul 26, 19:15 UTC50m
2026-07-26 RPA3663 EWR → ROC Jul 26, 14:50 UTCJul 26, 16:25 UTC1h 35m
2026-07-26 RPA3612 CMH → EWR Jul 26, 12:35 UTCJul 26, 13:40 UTC1h 5m
2026-07-26 RPA3668 EWR → ATL Jul 26, 10:20 UTCJul 26, 11:00 UTC40m
2026-07-26 RPA3668 EWR → ATL Jul 26, 10:34 UTCJul 26, 11:03 UTC29m
2026-07-26 RPA3516 CVG → EWR Jul 26, 02:50 UTCJul 26, 03:35 UTC45m
2026-07-25 RPA3582 ORF → EWR Jul 25, 23:25 UTCJul 26, 00:50 UTC1h 25m
2026-07-25 RPA3599 DFW → EWR Jul 25, 21:10 UTCJul 25, 22:05 UTC55m
2026-07-25 RPA3568 EWR → GSP Jul 25, 16:55 UTCJul 25, 18:15 UTC1h 20m
2026-07-25 RPA3673 IAD → BTV Jul 25, 14:40 UTCJul 25, 15:50 UTC1h 10m
2026-07-25 RPA3706 EWR → YYZ Jul 25, 11:45 UTCJul 25, 12:55 UTC1h 10m
2026-07-25 RPA3706 EWR → YYZ Jul 25, 11:42 UTCJul 25, 12:50 UTC1h 8m
2026-07-25 RPA3592 BNA → EWR Jul 25, 02:15 UTCJul 25, 03:25 UTC1h 10m
2026-07-25 RPA3592 BNA → EWR Jul 25, 02:19 UTCJul 25, 03:36 UTC1h 17m
2026-07-24 RPA3644 EWR → PHL Jul 24, 23:15 UTCJul 25, 00:30 UTC1h 15m
2026-07-24 RPA3596 EWR → PIT Jul 24, 20:47 UTCJul 24, 21:49 UTC1h 2m
2026-07-24 RPA3596 EWR → PIT Jul 24, 20:30 UTCJul 24, 21:50 UTC1h 20m
2026-07-24 RPA3708 ORF → EWR Jul 24, 17:25 UTCJul 24, 18:40 UTC1h 15m
2026-07-24 RPA3587 EWR → GSO Jul 24, 14:44 UTCJul 24, 15:55 UTC1h 11m
2026-07-24 RPA3587 EWR → GSO Jul 24, 14:35 UTCJul 24, 15:45 UTC1h 10m
2026-07-24 RPA3470 EWR → JAX Jul 24, 11:35 UTCJul 24, 13:15 UTC1h 40m
2026-07-24 RPA3564 CMH → EWR Jul 24, 02:45 UTCJul 24, 04:35 UTC1h 50m
2026-07-23 RPA3565 BNA → EWR Jul 23, 23:45 UTCJul 24, 00:50 UTC1h 5m
2026-07-23 RPA3565 BNA → EWR Jul 23, 23:46 UTCJul 24, 00:44 UTC58m
2026-07-23 RPA3579 CVG → EWR Jul 23, 21:55 UTCJul 23, 22:25 UTC30m
2026-07-23 RPA3401 BNA → EWR Jul 23, 19:00 UTCJul 23, 20:00 UTC1h 0m
2026-07-23 RPA3401 BNA → EWR Jul 23, 19:03 UTCJul 23, 20:02 UTC59m
2026-07-23 RPA3646 MEM → EWR Jul 23, 16:00 UTCJul 23, 17:35 UTC1h 35m
2026-07-23 RPA3646 MEM → EWR Jul 23, 16:08 UTCJul 23, 17:33 UTC1h 25m
2026-07-23 RPA3429 MEM → EWR Jul 23, 11:25 UTCJul 23, 12:20 UTC55m
2026-07-22 RPA3545 EWR → CMH Jul 22, 22:30 UTCJul 22, 23:45 UTC1h 15m
2026-07-22 RPA3545 YUL → EWR Jul 22, 19:45 UTCJul 22, 20:40 UTC55m
2026-07-22 RPA3547 EWR → BOS Jul 22, 17:10 UTCJul 22, 18:30 UTC1h 20m
2026-07-21 RPA3430 EWR → CVG Jul 21, 15:40 UTCJul 21, 16:45 UTC1h 5m
2026-07-21 RPA3430 EWR → CVG Jul 21, 15:32 UTCJul 21, 16:47 UTC1h 15m
2026-07-21 RPA3529 GSO → EWR Jul 21, 13:30 UTCJul 21, 14:50 UTC1h 20m
2026-07-21 RPA3619 SAV → EWR Jul 21, 10:25 UTCJul 21, 11:25 UTC1h 0m
2026-07-20 RPA3670 EWR → GSP Jul 20, 23:25 UTCJul 21, 01:05 UTC1h 39m
2026-07-20 RPA3575 GSP → EWR Jul 20, 20:20 UTCJul 20, 21:15 UTC55m
2026-07-20 RPA3575 GSP → EWR Jul 20, 20:30 UTCJul 20, 20:57 UTC27m
2026-07-20 RPA3422 - Jul 20, 14:30 UTCJul 20, 15:20 UTC50m
2026-07-20 RPA3422 - Jul 20, 11:30 UTCJul 20, 12:25 UTC55m
2026-07-20 RPA3659 GSO → EWR Jul 20, 04:16 UTCJul 20, 04:56 UTC40m
2026-07-20 RPA3659 GSO → EWR Jul 20, 04:10 UTCJul 20, 04:55 UTC45m
2026-07-20 RPA3657 SAV → EWR Jul 20, 02:10 UTCJul 20, 02:50 UTC40m
2026-07-19 RPA3585 IAD → IND Jul 19, 23:45 UTCJul 20, 01:00 UTC1h 15m
2026-07-19 RPA3717 - Jul 19, 19:05 UTCJul 19, 20:20 UTC1h 15m
2026-07-19 RPA3538 IAD → SDF Jul 19, 01:55 UTCJul 19, 03:10 UTC1h 15m
2026-07-18 RPA3401 BNA → EWR Jul 18, 22:55 UTCJul 19, 00:05 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 N748YX page for operator, model, and routing details .

Mode-S AA127E frequently asked

What is Mode-S code AA127E?
AA127E is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N748YX.
Where is Mode-S AA127E registered?
Mode-S code AA127E 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 AA127E broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AA127E, octal 52411176, decimal 11,145,854.
What flights does AA127E operate?
Mode-S AA127E has broadcast 20 distinct callsigns, including RPA3488, RPA3685, RPA3596, RPA3618, RPA3591.