Apparatus

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sensors Mode-S transponder

A21833

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N234JQ · EMBRAER ERJ-170-200 (long wing) · operated by DELTA AIR LINES INC

Hex
A21833
Octal
50414063
Decimal
10,623,027
Country
US
Tail
N234JQ
Type
E75L
Broadcasting now · callsign RPA5619 · 31,850 ft
Flights observed
709
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:45 UTC

Current position

A21833 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A21833 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
RPA5837 - 14 2026-07-12
RPA5800 - 12 2026-06-25
RPA5649 - 12 2026-06-19
RPA5859 - 9 2026-07-03
RPA5767 Republic Airlines 9 2026-07-23
RPA5653 Republic Airlines 9 2026-07-26
RPA5644 - 9 2026-06-22
RPA5628 - 9 2026-07-12
RPA5858 Republic Airlines 8 2026-05-31
RPA5852 Republic Airlines 8 2026-07-23
RPA5846 Republic Airlines 8 2026-06-25
RPA5775 - 8 2026-07-20
RPA5764 - 8 2026-07-11
RPA5634 - 8 2026-06-26
RPA5592 - 8 2026-07-15
RPA5706 Republic Airlines 7 2026-07-22
RPA5705 Republic Airlines 7 2026-05-21
RPA5701 Republic Airlines 7 2026-07-22
RPA5860 Republic Airlines 6 2026-06-27
RPA5844 Republic Airlines 6 2026-06-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 RPA5653 LGA → PWM Jul 26, 21:45 UTCJul 26, 22:45 UTC1h 0m
2026-07-26 RPA5653 LGA → PWM Jul 26, 18:45 UTCJul 26, 20:25 UTC1h 40m
2026-07-26 RPA5778 LGA → BOS Jul 26, 15:35 UTCJul 26, 17:20 UTC1h 45m
2026-07-26 RPA5778 LGA → BOS Jul 26, 12:25 UTCJul 26, 14:20 UTC1h 55m
2026-07-25 RPA5615 CLT → JFK Jul 25, 19:50 UTCJul 25, 21:45 UTC1h 55m
2026-07-25 RPA5615 CLT → JFK Jul 25, 16:25 UTCJul 25, 18:30 UTC2h 5m
2026-07-25 RPA5648 DCA → BOS Jul 25, 13:30 UTCJul 25, 15:05 UTC1h 35m
2026-07-25 RPA5807 EWR → BOS Jul 25, 00:20 UTCJul 25, 02:10 UTC1h 50m
2026-07-24 RPA5839 LGA → DCA Jul 24, 21:27 UTCJul 24, 22:26 UTC59m
2026-07-24 RPA5839 LGA → DCA Jul 24, 21:30 UTCJul 24, 22:30 UTC1h 0m
2026-07-24 RPA5709 LGA → PIT Jul 24, 19:35 UTCJul 24, 20:25 UTC50m
2026-07-24 RPA5848 LGA → DCA Jul 24, 15:40 UTCJul 24, 17:35 UTC1h 55m
2026-07-24 RPA5848 LGA → DCA Jul 24, 12:50 UTCJul 24, 14:40 UTC1h 50m
2026-07-24 RPA5811 JFK → BUF Jul 24, 10:10 UTCJul 24, 11:00 UTC50m
2026-07-24 RPA5676 LGA → DCA Jul 24, 01:55 UTCJul 24, 03:10 UTC1h 15m
2026-07-23 RPA5746 JFK → CLT Jul 23, 23:10 UTCJul 23, 23:45 UTC35m
2026-07-23 RPA5746 JFK → CLT Jul 23, 23:10 UTCJul 23, 23:45 UTC35m
2026-07-23 RPA5767 BOS → JFK Jul 23, 20:55 UTCJul 23, 21:45 UTC50m
2026-07-23 RPA5767 BOS → JFK Jul 23, 20:53 UTCJul 23, 21:40 UTC47m
2026-07-23 RPA5767 BOS → JFK Jul 23, 18:35 UTCJul 23, 19:10 UTC35m
2026-07-23 RPA5712 SAV → BOS Jul 23, 16:30 UTCJul 23, 17:20 UTC50m
2026-07-23 RPA5712 SAV → BOS Jul 23, 14:40 UTCJul 23, 15:15 UTC35m
2026-07-23 RPA5735 LGA → DCA Jul 23, 12:30 UTCJul 23, 13:20 UTC50m
2026-07-23 RPA5852 LGA → CLT Jul 23, 10:30 UTCJul 23, 11:05 UTC35m
2026-07-23 RPA5849 BOS → HPN Jul 23, 01:50 UTCJul 23, 02:26 UTC36m
2026-07-23 RPA5849 BOS → HPN Jul 23, 01:50 UTCJul 23, 02:45 UTC55m
2026-07-22 RPA5706 ORF → LGA Jul 22, 22:20 UTCJul 22, 23:10 UTC50m
2026-07-22 RPA5706 ORF → LGA Jul 22, 19:25 UTCJul 22, 20:45 UTC1h 20m
2026-07-22 RPA5758 CMH → LGA Jul 22, 17:20 UTCJul 22, 18:00 UTC40m
2026-07-22 RPA5796 - Jul 22, 14:50 UTCJul 22, 15:45 UTC55m
2026-07-22 RPA5606 - Jul 22, 12:40 UTCJul 22, 13:20 UTC40m
2026-07-22 RPA5606 DTW → PIT Jul 22, 12:38 UTCJul 22, 13:17 UTC39m
2026-07-22 RPA5701 LGA → JAX Jul 22, 11:10 UTCJul 22, 11:30 UTC20m
2026-07-21 RPA5629 BOS → CMH Jul 21, 00:11 UTCJul 21, 01:48 UTC1h 37m
2026-07-21 RPA5629 BOS → CMH Jul 21, 00:15 UTCJul 21, 01:50 UTC1h 35m
2026-07-20 RPA5725 RIC → BOS Jul 20, 22:10 UTCJul 20, 22:55 UTC45m
2026-07-20 RPA5862 - Jul 20, 19:00 UTCJul 20, 20:15 UTC1h 15m
2026-07-20 RPA5862 - Jul 20, 16:25 UTCJul 20, 17:30 UTC1h 5m
2026-07-20 RPA5875 - Jul 20, 12:35 UTCJul 20, 15:05 UTC2h 30m
2026-07-20 RPA5775 LGA → MEM Jul 20, 03:50 UTCJul 20, 05:55 UTC2h 5m
2026-07-19 RPA5638 DCA → BOS Jul 19, 21:35 UTCJul 19, 23:00 UTC1h 25m
2026-07-19 RPA5821 LGA → DCA Jul 19, 18:20 UTCJul 19, 20:05 UTC1h 45m
2026-07-19 RPA5790 - Jul 19, 10:25 UTCJul 19, 12:05 UTC1h 40m
2026-07-18 RPA5620 LGA → DCA Jul 18, 21:50 UTCJul 18, 23:50 UTC2h 0m
2026-07-18 RPA5757 - Jul 18, 18:20 UTCJul 18, 19:50 UTC1h 30m
2026-07-18 RPA5757 YHZ → BOS Jul 18, 18:18 UTCJul 18, 19:43 UTC1h 25m
2026-07-18 RPA5756 - Jul 18, 14:55 UTCJul 18, 15:55 UTC1h 0m
2026-07-18 RPA5631 - Jul 18, 11:10 UTCJul 18, 12:55 UTC1h 45m
2026-07-18 RPA5696 LGA → IND Jul 18, 00:55 UTCJul 18, 02:35 UTC1h 40m
2026-07-17 RPA5828 BOS → LGA Jul 17, 22:25 UTCJul 17, 23:50 UTC1h 25m

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 N234JQ page for operator, model, and routing details .

Mode-S A21833 frequently asked

What is Mode-S code A21833?
A21833 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N234JQ.
Where is Mode-S A21833 registered?
Mode-S code A21833 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 A21833 broadcasting right now?
Yes. Mode-S A21833 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A21833, octal 50414063, decimal 10,623,027.
What flights does A21833 operate?
Mode-S A21833 has broadcast 20 distinct callsigns, including RPA5837, RPA5800, RPA5649, RPA5859, RPA5767.