Apparatus

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sensors Mode-S transponder

A1FF90

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N228JQ · EMBRAER ERJ-170-200 (long wing) · operated by DELTA AIR LINES INC

Hex
A1FF90
Octal
50377620
Decimal
10,616,720
Country
US
Tail
N228JQ
Type
E75L
No current signal · last broadcast 28m ago
Flights observed
635
Distinct callsigns
20
Country
US
Last broadcast
28m ago

Last known position

Most recent position reported by Mode-S A1FF90.

Country allocation

The ICAO 24-bit address A1FF90 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
RPA5829 - 12 2026-07-10
RPA5687 - 12 2026-06-18
RPA5708 - 11 2026-06-25
RPA5834 Republic Airlines 10 2026-05-26
RPA5843 - 8 2026-07-14
RPA5810 - 8 2026-07-06
RPA5777 Republic Airlines 8 2026-06-08
RPA5669 Republic Airlines 8 2026-05-26
RPA5858 Republic Airlines 7 2026-05-29
RPA5758 - 7 2026-07-03
RPA5731 - 7 2026-07-08
RPA5707 - 7 2026-06-25
RPA5600 Republic Airlines 7 2026-07-01
RPA5597 - 7 2026-07-02
RPA5854 Republic Airlines 6 2026-05-05
RPA5785 - 6 2026-07-10
RPA5649 - 6 2026-07-13
RPA5644 Republic Airlines 6 2026-04-30
RPA5641 - 6 2026-07-03
RPA5629 - 6 2026-06-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 RPA5843 - Jul 14, 23:00 UTCJul 14, 23:55 UTC55m
2026-07-14 RPA5843 - Jul 14, 21:15 UTCJul 14, 22:05 UTC50m
2026-07-14 RPA5730 BOS → LGA Jul 14, 19:36 UTCJul 14, 20:14 UTC38m
2026-07-14 RPA5730 BOS → LGA Jul 14, 19:40 UTCJul 14, 20:20 UTC40m
2026-07-14 RPA5628 - Jul 14, 15:10 UTCJul 14, 17:00 UTC1h 50m
2026-07-14 RPA5628 BOS → IND Jul 14, 11:50 UTCJul 14, 13:45 UTC1h 55m
2026-07-14 RPA5850 LGA → BOS Jul 14, 00:15 UTCJul 14, 01:00 UTC45m
2026-07-13 RPA5763 DCA → LGA Jul 13, 22:25 UTCJul 13, 23:10 UTC45m
2026-07-13 RPA5699 - Jul 13, 20:45 UTCJul 13, 21:25 UTC40m
2026-07-13 RPA5649 - Jul 13, 16:40 UTCJul 13, 18:05 UTC1h 25m
2026-07-13 RPA5649 JFK → CMH Jul 13, 14:15 UTCJul 13, 15:25 UTC1h 10m
2026-07-13 RPA5656 - Jul 13, 11:10 UTCJul 13, 12:35 UTC1h 25m
2026-07-12 RPA5671 LGA → CMH Jul 12, 21:42 UTCJul 12, 22:55 UTC1h 13m
2026-07-12 RPA5671 LGA → CMH Jul 12, 21:45 UTCJul 12, 23:00 UTC1h 15m
2026-07-12 RPA5736 BOS → LGA Jul 12, 19:20 UTCJul 12, 20:05 UTC45m
2026-07-12 RPA5861 - Jul 12, 16:20 UTCJul 12, 17:55 UTC1h 35m
2026-07-12 RPA5621 LGA → TVC Jul 12, 13:46 UTCJul 12, 15:21 UTC1h 35m
2026-07-12 RPA5621 - Jul 12, 13:45 UTCJul 12, 15:10 UTC1h 25m
2026-07-12 RPA5771 - Jul 12, 11:20 UTCJul 12, 12:45 UTC1h 25m
2026-07-12 RPA5771 IND → LGA Jul 12, 11:16 UTCJul 12, 12:45 UTC1h 29m
2026-07-11 RPA5903 RDU → CLE Jul 11, 13:45 UTCJul 11, 14:00 UTC15m
2026-07-10 RPA5616 BOS → IND Jul 10, 23:25 UTCJul 11, 01:35 UTC2h 10m
2026-07-10 RPA5616 BOS → IND Jul 10, 23:25 UTCJul 11, 01:32 UTC2h 7m
2026-07-10 RPA5829 EWR → BOS Jul 10, 20:05 UTCJul 10, 20:55 UTC50m
2026-07-10 RPA5829 EWR → BOS Jul 10, 20:04 UTCJul 10, 20:51 UTC47m
2026-07-10 RPA5829 BOS → EWR Jul 10, 18:15 UTCJul 10, 19:05 UTC50m
2026-07-10 RPA5785 - Jul 10, 15:15 UTCJul 10, 15:55 UTC40m
2026-07-10 RPA5785 LGA → BOS Jul 10, 15:13 UTCJul 10, 15:51 UTC38m
2026-07-10 RPA5625 MKE → LGA Jul 10, 12:30 UTCJul 10, 14:15 UTC1h 45m
2026-07-10 RPA5883 RIC → BOS Jul 10, 00:15 UTCJul 10, 02:05 UTC1h 50m
2026-07-09 RPA5835 JFK → IAD Jul 9, 15:00 UTCJul 9, 15:45 UTC45m
2026-07-09 RPA5741 - Jul 9, 11:25 UTCJul 9, 13:10 UTC1h 45m
2026-07-09 RPA5741 ORD → JFK Jul 9, 11:24 UTCJul 9, 13:03 UTC1h 39m
2026-07-09 RPA5640 - Jul 9, 00:20 UTCJul 9, 02:10 UTC1h 50m
2026-07-08 RPA5814 - Jul 8, 21:25 UTCJul 8, 22:00 UTC35m
2026-07-08 RPA5814 BOS → JFK Jul 8, 21:21 UTCJul 8, 21:58 UTC37m
2026-07-08 RPA5731 - Jul 8, 18:30 UTCJul 8, 19:40 UTC1h 10m
2026-07-08 RPA5731 PIT → BOS Jul 8, 18:26 UTCJul 8, 19:38 UTC1h 12m
2026-07-08 RPA5731 - Jul 8, 15:55 UTCJul 8, 17:10 UTC1h 15m
2026-07-08 RPA5764 - Jul 8, 13:40 UTCJul 8, 14:25 UTC45m
2026-07-08 RPA5764 BNH → EWR Jul 8, 10:40 UTCJul 8, 11:40 UTC1h 0m
2026-07-08 RPA5633 DCA → BOS Jul 8, 04:20 UTCJul 8, 05:35 UTC1h 15m
2026-07-08 RPA5724 BOS → DCA Jul 8, 00:10 UTCJul 8, 00:55 UTC45m
2026-07-07 RPA5721 BOS → LGA Jul 7, 22:02 UTCJul 7, 22:52 UTC50m
2026-07-07 RPA5721 BOS → LGA Jul 7, 22:05 UTCJul 7, 22:50 UTC45m
2026-07-07 RPA5630 - Jul 7, 18:20 UTCJul 7, 20:10 UTC1h 50m
2026-07-07 RPA5630 - Jul 7, 14:20 UTCJul 7, 16:05 UTC1h 45m
2026-07-07 RPA5759 LGA → BOS Jul 7, 12:25 UTCJul 7, 13:00 UTC35m
2026-07-06 RPA5843 - Jul 6, 23:40 UTCJul 7, 00:00 UTC20m
2026-07-06 RPA5843 PIT → LGA Jul 6, 23:39 UTCJul 7, 01:00 UTC1h 21m

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 N228JQ page for operator, model, and routing details .

Mode-S A1FF90 frequently asked

What is Mode-S code A1FF90?
A1FF90 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N228JQ.
Where is Mode-S A1FF90 registered?
Mode-S code A1FF90 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 A1FF90 broadcasting right now?
No active broadcast right now. Last signal was 28m ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A1FF90, octal 50377620, decimal 10,616,720.
What flights does A1FF90 operate?
Mode-S A1FF90 has broadcast 20 distinct callsigns, including RPA5829, RPA5687, RPA5708, RPA5834, RPA5843.