Apparatus

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sensors Mode-S transponder

AB3D17

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N823MD · EMBRAER ERJ-170-100 · operated by UMB BANK NA TRUSTEE

Hex
AB3D17
Octal
52636427
Decimal
11,222,295
Country
US
Tail
N823MD
Type
E170
No current signal · last broadcast 4h ago
Flights observed
537
Distinct callsigns
20
Country
US
Last broadcast
4h ago

Last known position

Most recent position reported by Mode-S AB3D17.

Country allocation

The ICAO 24-bit address AB3D17 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
RPA5637 - 19 2026-07-10
RPA5817 - 17 2026-07-04
RPA5694 - 17 2026-06-26
RPA5760 - 15 2026-07-14
RPA5742 - 15 2026-06-29
RPA5705 - 15 2026-06-28
RPA5590 - 15 2026-07-05
RPA5686 Republic Airlines 13 2026-06-02
RPA5830 - 12 2026-07-04
RPA5822 - 12 2026-07-09
RPA5723 - 12 2026-07-13
RPA5799 - 11 2026-06-28
RPA5618 - 11 2026-07-04
RPA5715 Republic Airlines 10 2026-06-02
RPA5794 - 9 2026-07-12
RPA5691 - 9 2026-06-26
RPA5606 Republic Airlines 9 2026-04-25
RPA5841 - 8 2026-07-03
RPA5825 - 8 2026-06-26
RPA5752 - 8 2026-07-03

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 RPA5760 - Jul 14, 00:05 UTCJul 14, 01:00 UTC55m
2026-07-14 RPA5760 RIC → LGA Jul 14, 00:01 UTCJul 14, 00:57 UTC56m
2026-07-13 RPA5760 - Jul 13, 21:40 UTCJul 13, 22:35 UTC55m
2026-07-13 RPA5723 - Jul 13, 18:30 UTCJul 13, 20:25 UTC1h 55m
2026-07-13 RPA5723 - Jul 13, 15:35 UTCJul 13, 17:20 UTC1h 45m
2026-07-13 RPA5772 - Jul 13, 13:50 UTCJul 13, 14:35 UTC45m
2026-07-13 RPA5770 LGA → DCA Jul 13, 12:20 UTCJul 13, 13:06 UTC46m
2026-07-13 RPA5770 LGA → DCA Jul 13, 12:20 UTCJul 13, 13:10 UTC50m
2026-07-13 RPA5760 - Jul 13, 00:15 UTCJul 13, 01:05 UTC50m
2026-07-12 RPA5760 - Jul 12, 21:45 UTCJul 12, 22:40 UTC55m
2026-07-12 RPA5723 - Jul 12, 18:25 UTCJul 12, 20:10 UTC1h 45m
2026-07-12 RPA5723 - Jul 12, 15:10 UTCJul 12, 16:55 UTC1h 45m
2026-07-12 RPA5794 PIT → LGA Jul 12, 12:40 UTCJul 12, 13:35 UTC55m
2026-07-11 RPA5843 - Jul 11, 23:10 UTCJul 12, 00:10 UTC1h 0m
2026-07-11 RPA5642 - Jul 11, 18:55 UTCJul 11, 21:20 UTC2h 25m
2026-07-11 RPA5642 LGA → IND Jul 11, 14:25 UTCJul 11, 16:05 UTC1h 40m
2026-07-11 RPA5760 - Jul 11, 01:15 UTCJul 11, 02:00 UTC45m
2026-07-10 RPA5760 LGA → RIC Jul 10, 22:45 UTCJul 10, 23:55 UTC1h 10m
2026-07-10 RPA5637 - Jul 10, 19:30 UTCJul 10, 21:00 UTC1h 30m
2026-07-10 RPA5637 - Jul 10, 17:00 UTCJul 10, 18:35 UTC1h 35m
2026-07-10 RPA5847 - Jul 10, 12:15 UTCJul 10, 14:00 UTC1h 45m
2026-07-10 RPA5853 - Jul 10, 01:20 UTCJul 10, 03:20 UTC2h 0m
2026-07-09 RPA5822 - Jul 9, 21:45 UTCJul 9, 22:30 UTC45m
2026-07-09 RPA5822 MVY → LGA Jul 9, 21:43 UTCJul 9, 22:27 UTC44m
2026-07-09 RPA5822 LGA → MVY Jul 9, 18:30 UTCJul 9, 19:05 UTC35m
2026-07-09 RPA5662 - Jul 9, 16:30 UTCJul 9, 17:20 UTC50m
2026-07-09 RPA5662 MVY → LGA Jul 9, 16:25 UTCJul 9, 17:19 UTC54m
2026-07-09 RPA5662 LGA → MVY Jul 9, 14:10 UTCJul 9, 14:40 UTC30m
2026-07-09 RPA5599 CLT → LGA Jul 9, 11:12 UTCJul 9, 12:44 UTC1h 32m
2026-07-09 RPA5818 - Jul 9, 01:10 UTCJul 9, 02:30 UTC1h 20m
2026-07-08 RPA5763 - Jul 8, 23:25 UTCJul 9, 00:10 UTC45m
2026-07-08 RPA5699 - Jul 8, 20:40 UTCJul 8, 21:35 UTC55m
2026-07-08 RPA5859 - Jul 8, 17:30 UTCJul 8, 18:05 UTC35m
2026-07-08 RPA5859 JFK → MVY Jul 8, 15:30 UTCJul 8, 16:15 UTC45m
2026-07-08 RPA5720 BOS → JFK Jul 8, 13:55 UTCJul 8, 14:35 UTC40m
2026-07-08 RPA5697 - Jul 8, 11:35 UTCJul 8, 12:45 UTC1h 10m
2026-07-08 RPA5815 DCA → BOS Jul 8, 01:30 UTCJul 8, 02:25 UTC55m
2026-07-07 RPA5591 - Jul 7, 22:45 UTCJul 8, 00:10 UTC1h 25m
2026-07-07 RPA5591 - Jul 7, 19:40 UTCJul 7, 21:15 UTC1h 35m
2026-07-07 RPA5748 BOS → LGA Jul 7, 17:30 UTCJul 7, 18:25 UTC55m
2026-07-07 RPA5632 - Jul 7, 12:35 UTCJul 7, 14:50 UTC2h 15m
2026-07-07 RPA5593 - Jul 7, 03:45 UTCJul 7, 06:00 UTC2h 15m
2026-07-07 RPA5706 PHL → BOS Jul 7, 01:40 UTCJul 7, 02:25 UTC45m
2026-07-07 RPA5706 PHL → BOS Jul 7, 01:35 UTCJul 7, 02:24 UTC49m
2026-07-06 RPA5706 BOS → PHL Jul 6, 23:00 UTCJul 7, 00:00 UTC1h 0m
2026-07-06 RPA5630 - Jul 6, 18:50 UTCJul 6, 20:35 UTC1h 45m
2026-07-06 RPA5630 - Jul 6, 14:25 UTCJul 6, 16:10 UTC1h 45m
2026-07-06 RPA5631 - Jul 6, 10:50 UTCJul 6, 12:35 UTC1h 45m
2026-07-05 RPA5884 - Jul 5, 20:25 UTCJul 5, 20:55 UTC30m
2026-07-05 RPA5833 LGA → LEX Jul 5, 17:55 UTCJul 5, 19:30 UTC1h 35m

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 N823MD page for operator, model, and routing details .

Mode-S AB3D17 frequently asked

What is Mode-S code AB3D17?
AB3D17 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N823MD.
Where is Mode-S AB3D17 registered?
Mode-S code AB3D17 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 AB3D17 broadcasting right now?
No active broadcast right now. Last signal was 4h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AB3D17, octal 52636427, decimal 11,222,295.
What flights does AB3D17 operate?
Mode-S AB3D17 has broadcast 20 distinct callsigns, including RPA5637, RPA5817, RPA5694, RPA5760, RPA5742.