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 Jul 26, 22:00 UTC
Flights observed
710
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:00 UTC

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
RPA5687 - 14 2026-07-15
RPA5829 - 12 2026-07-10
RPA5708 - 11 2026-06-25
RPA5834 Republic Airlines 10 2026-05-26
RPA5837 Republic Airlines 9 2026-07-23
RPA5843 - 8 2026-07-14
RPA5810 - 8 2026-07-06
RPA5785 - 8 2026-07-17
RPA5777 Republic Airlines 8 2026-06-08
RPA5669 Republic Airlines 8 2026-05-26
RPA5620 Republic Airlines 8 2026-07-20
RPA5858 Republic Airlines 7 2026-05-29
RPA5758 - 7 2026-07-03
RPA5731 - 7 2026-07-08
RPA5715 - 7 2026-07-15
RPA5707 - 7 2026-06-25
RPA5668 - 7 2026-07-17
RPA5654 Republic Airlines 7 2026-07-22
RPA5625 Republic Airlines 7 2026-07-26
RPA5600 Republic Airlines 7 2026-07-01

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 RPA5767 BOS → JFK Jul 26, 21:25 UTCJul 26, 22:00 UTC35m
2026-07-26 RPA5767 BOS → JFK Jul 26, 19:45 UTCJul 26, 20:20 UTC35m
2026-07-26 RPA5712 SAV → BOS Jul 26, 17:25 UTCJul 26, 18:20 UTC55m
2026-07-26 RPA5712 SAV → BOS Jul 26, 14:25 UTCJul 26, 15:00 UTC35m
2026-07-26 RPA5625 CLT → BOS Jul 26, 11:10 UTCJul 26, 13:00 UTC1h 50m
2026-07-26 RPA5625 CLT → BOS Jul 26, 11:10 UTCJul 26, 13:00 UTC1h 50m
2026-07-25 RPA5780 DCA → LGA Jul 25, 20:39 UTCJul 25, 22:26 UTC1h 47m
2026-07-25 RPA5780 DCA → LGA Jul 25, 20:40 UTCJul 25, 22:25 UTC1h 45m
2026-07-25 RPA5747 JFK → JAX Jul 25, 18:20 UTCJul 25, 19:05 UTC45m
2026-07-25 RPA5749 BUF → JFK Jul 25, 15:50 UTCJul 25, 16:35 UTC45m
2026-07-25 RPA5772 BOS → MCI Jul 25, 13:55 UTCJul 25, 14:40 UTC45m
2026-07-25 RPA5772 BOS → MCI Jul 25, 13:53 UTCJul 25, 14:35 UTC42m
2026-07-25 RPA5770 LGA → CMH Jul 25, 11:15 UTCJul 25, 12:00 UTC45m
2026-07-24 RPA5779 BOS → DCA Jul 24, 22:40 UTCJul 25, 00:55 UTC2h 15m
2026-07-24 RPA5773 CMH → JFK Jul 24, 17:55 UTCJul 24, 20:05 UTC2h 10m
2026-07-24 RPA5688 SDF → LGA Jul 24, 14:35 UTCJul 24, 16:25 UTC1h 50m
2026-07-24 RPA5688 SDF → LGA Jul 24, 11:25 UTCJul 24, 13:15 UTC1h 50m
2026-07-24 RPA5609 IND → BOS Jul 24, 01:15 UTCJul 24, 02:00 UTC45m
2026-07-23 RPA5837 DCA → LGA Jul 23, 22:05 UTCJul 23, 23:40 UTC1h 35m
2026-07-23 RPA5837 DCA → LGA Jul 23, 22:03 UTCJul 23, 23:43 UTC1h 40m
2026-07-23 RPA5837 DCA → LGA Jul 23, 18:25 UTCJul 23, 20:25 UTC2h 0m
2026-07-23 RPA5622 - Jul 23, 15:50 UTCJul 23, 17:10 UTC1h 20m
2026-07-23 RPA5622 - Jul 23, 13:25 UTCJul 23, 14:50 UTC1h 25m
2026-07-23 RPA5684 BOS → ORD Jul 23, 10:20 UTCJul 23, 11:35 UTC1h 15m
2026-07-23 RPA5655 BOS → PHL Jul 23, 01:35 UTCJul 23, 03:10 UTC1h 35m
2026-07-22 RPA5837 DCA → LGA Jul 22, 22:10 UTCJul 22, 23:50 UTC1h 40m
2026-07-22 RPA5837 DCA → LGA Jul 22, 18:40 UTCJul 22, 20:55 UTC2h 15m
2026-07-22 RPA5654 BNA → LGA Jul 22, 15:25 UTCJul 22, 16:55 UTC1h 30m
2026-07-22 RPA5654 BNA → LGA Jul 22, 12:25 UTCJul 22, 14:05 UTC1h 40m
2026-07-21 RPA5720 BOS → JFK Jul 21, 13:45 UTCJul 21, 14:30 UTC45m
2026-07-21 RPA5690 PIT → BOS Jul 21, 10:10 UTCJul 21, 11:20 UTC1h 10m
2026-07-21 RPA5722 - Jul 21, 02:00 UTCJul 21, 03:00 UTC1h 0m
2026-07-20 RPA5716 BOS → LGA Jul 20, 23:32 UTCJul 21, 00:15 UTC43m
2026-07-20 RPA5716 BOS → LGA Jul 20, 23:35 UTCJul 21, 00:20 UTC45m
2026-07-20 RPA5819 LGA → BOS Jul 20, 20:45 UTCJul 20, 21:25 UTC40m
2026-07-20 RPA5747 DCA → LGA Jul 20, 18:20 UTCJul 20, 19:05 UTC45m
2026-07-20 RPA5749 - Jul 20, 16:20 UTCJul 20, 17:00 UTC40m
2026-07-20 RPA5749 - Jul 20, 16:10 UTCJul 20, 16:15 UTC5m
2026-07-20 RPA5732 BOS → LGA Jul 20, 13:35 UTCJul 20, 14:20 UTC45m
2026-07-20 RPA5620 LGA → DCA Jul 20, 01:50 UTCJul 20, 03:35 UTC1h 45m
2026-07-19 RPA5620 LGA → DCA Jul 19, 23:05 UTCJul 20, 01:00 UTC1h 55m
2026-07-19 RPA5595 JFK → BNH Jul 19, 19:00 UTCJul 19, 19:40 UTC40m
2026-07-19 RPA5595 JFK → BOS Jul 19, 19:00 UTCJul 19, 19:37 UTC37m
2026-07-19 RPA5823 - Jul 19, 16:15 UTCJul 19, 17:10 UTC55m
2026-07-19 RPA5754 - Jul 19, 14:30 UTCJul 19, 15:10 UTC40m
2026-07-19 RPA5754 DTW → PIT Jul 19, 14:30 UTCJul 19, 15:05 UTC35m
2026-07-18 RPA5607 PIT → DTW Jul 18, 23:50 UTCJul 19, 00:40 UTC50m
2026-07-18 RPA5607 PIT → DTW Jul 18, 23:50 UTCJul 19, 00:37 UTC47m
2026-07-18 RPA5605 - Jul 18, 20:40 UTCJul 18, 21:55 UTC1h 15m
2026-07-18 RPA5840 BOS → LGA Jul 18, 02:09 UTCJul 18, 02:50 UTC41m

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 Jul 26, 22:00 UTC.
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 RPA5687, RPA5829, RPA5708, RPA5834, RPA5837.