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 Jul 26, 21:45 UTC
Flights observed
620
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:45 UTC

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 Republic Airlines 29 2026-07-26
RPA5694 - 19 2026-07-19
RPA5817 - 18 2026-07-15
RPA5760 Republic Airlines 18 2026-07-18
RPA5742 Republic Airlines 17 2026-07-22
RPA5705 Republic Airlines 17 2026-07-25
RPA5590 - 16 2026-07-15
RPA5822 - 14 2026-07-16
RPA5830 - 13 2026-07-15
RPA5799 Republic Airlines 13 2026-07-25
RPA5794 Republic Airlines 13 2026-07-26
RPA5686 Republic Airlines 13 2026-06-02
RPA5723 - 12 2026-07-13
RPA5618 - 12 2026-07-15
RPA5643 - 11 2026-07-14
RPA5841 - 10 2026-07-20
RPA5825 - 10 2026-07-19
RPA5752 Republic Airlines 10 2026-07-24
RPA5717 Republic Airlines 10 2026-07-26
RPA5715 Republic Airlines 10 2026-06-02

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 RPA5717 BOS → BNA Jul 26, 21:25 UTCJul 26, 21:45 UTC20m
2026-07-26 RPA5637 ORD → BOS Jul 26, 18:20 UTCJul 26, 20:00 UTC1h 40m
2026-07-26 RPA5637 ORD → BOS Jul 26, 15:10 UTCJul 26, 16:50 UTC1h 40m
2026-07-26 RPA5794 CHS → JFK Jul 26, 13:05 UTCJul 26, 14:00 UTC55m
2026-07-26 RPA5794 CHS → JFK Jul 26, 13:03 UTCJul 26, 13:57 UTC54m
2026-07-25 RPA5843 LGA → BOS Jul 25, 22:55 UTCJul 25, 23:15 UTC20m
2026-07-25 RPA5843 LGA → BOS Jul 25, 22:19 UTCJul 25, 23:13 UTC54m
2026-07-25 RPA5843 LGA → BOS Jul 25, 22:20 UTCJul 25, 22:50 UTC30m
2026-07-25 RPA5642 BOS → IND Jul 25, 18:55 UTCJul 25, 20:35 UTC1h 40m
2026-07-25 RPA5642 BOS → IND Jul 25, 13:20 UTCJul 25, 15:00 UTC1h 40m
2026-07-25 RPA5799 LGA → BOS Jul 25, 10:45 UTCJul 25, 11:45 UTC1h 0m
2026-07-25 RPA5799 LGA → BOS Jul 25, 10:43 UTCJul 25, 11:47 UTC1h 4m
2026-07-25 RPA5705 LGA → JAX Jul 25, 02:10 UTCJul 25, 02:55 UTC45m
2026-07-25 RPA5705 LGA → JAX Jul 25, 02:09 UTCJul 25, 02:54 UTC45m
2026-07-24 RPA5752 BNA → LGA Jul 24, 23:45 UTCJul 25, 00:35 UTC50m
2026-07-24 RPA5752 BNA → LGA Jul 24, 23:42 UTCJul 25, 00:27 UTC45m
2026-07-24 RPA5717 BOS → BNA Jul 24, 21:35 UTCJul 24, 22:25 UTC50m
2026-07-24 RPA5637 - Jul 24, 18:35 UTCJul 24, 20:15 UTC1h 40m
2026-07-24 RPA5637 LGA → SDF Jul 24, 16:05 UTCJul 24, 17:45 UTC1h 40m
2026-07-24 RPA5711 LGA → DCA Jul 24, 12:25 UTCJul 24, 14:35 UTC2h 10m
2026-07-24 RPA5711 LGA → DCA Jul 24, 12:22 UTCJul 24, 14:34 UTC2h 12m
2026-07-24 RPA5594 EYW → LGA Jul 24, 01:50 UTCJul 24, 04:30 UTC2h 40m
2026-07-24 RPA5594 EYW → LGA Jul 24, 01:47 UTCJul 24, 04:24 UTC2h 37m
2026-07-23 RPA5689 ORD → BOS Jul 23, 23:45 UTCJul 24, 00:45 UTC1h 0m
2026-07-23 RPA5717 BOS → BNA Jul 23, 21:45 UTCJul 23, 22:25 UTC40m
2026-07-23 RPA5717 BOS → BNA Jul 23, 21:45 UTCJul 23, 22:40 UTC55m
2026-07-23 RPA5637 - Jul 23, 18:20 UTCJul 23, 19:55 UTC1h 35m
2026-07-23 RPA5637 SDF → LGA Jul 23, 18:19 UTCJul 23, 19:50 UTC1h 31m
2026-07-23 RPA5637 LGA → SDF Jul 23, 15:25 UTCJul 23, 17:10 UTC1h 45m
2026-07-23 RPA5794 CHS → JFK Jul 23, 12:55 UTCJul 23, 13:55 UTC1h 0m
2026-07-22 RPA5792 - Jul 22, 23:05 UTCJul 23, 00:00 UTC55m
2026-07-22 RPA5833 JFK → PIT Jul 22, 20:05 UTCJul 22, 21:30 UTC1h 25m
2026-07-22 RPA5833 JFK → PIT Jul 22, 17:30 UTCJul 22, 19:10 UTC1h 40m
2026-07-22 RPA5742 DCA → BOS Jul 22, 15:30 UTCJul 22, 16:10 UTC40m
2026-07-22 RPA5742 DCA → BOS Jul 22, 13:15 UTCJul 22, 14:00 UTC45m
2026-07-22 RPA5806 BOS → LGA Jul 22, 11:10 UTCJul 22, 11:40 UTC30m
2026-07-21 RPA5878 BOS → MCI Jul 21, 22:25 UTCJul 21, 23:05 UTC40m
2026-07-21 RPA5880 GRR → IND Jul 21, 17:05 UTCJul 21, 17:45 UTC40m
2026-07-21 RPA5661 LGA → GRR Jul 21, 14:20 UTCJul 21, 16:15 UTC1h 55m
2026-07-21 RPA5797 JAX → BOS Jul 21, 10:55 UTCJul 21, 12:45 UTC1h 50m
2026-07-21 RPA5791 - Jul 21, 00:55 UTCJul 21, 02:50 UTC1h 55m
2026-07-20 RPA5675 - Jul 20, 21:40 UTCJul 20, 23:00 UTC1h 20m
2026-07-20 RPA5675 CMH → LGA Jul 20, 21:36 UTCJul 20, 22:54 UTC1h 18m
2026-07-20 RPA5675 LGA → CMH Jul 20, 19:25 UTCJul 20, 20:35 UTC1h 10m
2026-07-20 RPA5841 - Jul 20, 17:45 UTCJul 20, 18:25 UTC40m
2026-07-20 RPA5841 - Jul 20, 14:40 UTCJul 20, 15:15 UTC35m
2026-07-20 RPA5772 DCA → LGA Jul 20, 12:35 UTCJul 20, 13:15 UTC40m
2026-07-20 RPA5770 LGA → DCA Jul 20, 10:55 UTCJul 20, 11:40 UTC45m
2026-07-19 RPA5825 - Jul 19, 23:05 UTCJul 20, 00:55 UTC1h 50m
2026-07-19 RPA5825 LGA → MKE Jul 19, 20:00 UTCJul 19, 22:00 UTC2h 0m

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 Jul 26, 21:45 UTC.
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, RPA5694, RPA5817, RPA5760, RPA5742.