Apparatus

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sensors Mode-S transponder

A877D3

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N645AE · EMBRAER ERJ-145 · operated by AMERICAN AIRLINES INC

Hex
A877D3
Octal
52073723
Decimal
11,040,723
Country
US
Tail
N645AE
Type
E145
No current signal · last broadcast Jul 26, 21:45 UTC
Flights observed
846
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:45 UTC

Last known position

Most recent position reported by Mode-S A877D3.

Country allocation

The ICAO 24-bit address A877D3 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
PDT5802 Piedmont Airlines 12 2026-07-26
PDT5963 - 10 2026-07-19
PDT5946 Piedmont Airlines 10 2026-07-24
PDT5941 Piedmont Airlines 10 2026-07-21
PDT6003 Piedmont Airlines 9 2026-05-08
PDT5982 Piedmont Airlines 9 2026-05-30
PDT5900 Piedmont Airlines 9 2026-06-07
PDT5848 - 9 2026-07-18
PDT5792 - 9 2026-07-07
PDT5994 - 8 2026-06-20
PDT5924 - 8 2026-07-08
PDT5826 Piedmont Airlines 8 2026-07-24
PDT6114 - 7 2026-07-09
PDT6113 Piedmont Airlines 7 2026-07-25
PDT6065 - 7 2026-07-07
PDT6054 - 7 2026-06-23
PDT6051 Piedmont Airlines 7 2026-06-11
PDT6048 Piedmont Airlines 7 2026-06-11
PDT6026 - 7 2026-07-04
PDT6013 Piedmont Airlines 7 2026-04-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 PDT5831 CLT → TRI Jul 26, 21:00 UTCJul 26, 21:45 UTC45m
2026-07-26 PDT5831 CLT → TRI Jul 26, 19:45 UTCJul 26, 20:15 UTC30m
2026-07-26 PDT5802 EVV → CLT Jul 26, 18:00 UTCJul 26, 18:20 UTC20m
2026-07-26 PDT5802 EVV → CLT Jul 26, 15:25 UTCJul 26, 15:50 UTC25m
2026-07-26 PDT5802 EVV → CLT Jul 26, 15:24 UTCJul 26, 15:46 UTC22m
2026-07-26 PDT6074 TYS → PHL Jul 26, 00:05 UTCJul 26, 00:30 UTC25m
2026-07-25 PDT6074 TYS → PHL Jul 25, 23:00 UTCJul 25, 23:25 UTC25m
2026-07-25 PDT6113 ROC → PHL Jul 25, 20:30 UTCJul 25, 21:00 UTC30m
2026-07-25 PDT6113 ROC → PHL Jul 25, 19:15 UTCJul 25, 19:40 UTC25m
2026-07-25 PDT5878 BHM → ORD Jul 25, 16:30 UTCJul 25, 18:05 UTC1h 35m
2026-07-25 PDT5878 BHM → ORD Jul 25, 14:05 UTCJul 25, 15:15 UTC1h 10m
2026-07-25 PDT5833 BDL → PHL Jul 25, 10:50 UTCJul 25, 12:05 UTC1h 15m
2026-07-25 PDT5944 PHL → MDT Jul 25, 02:25 UTCJul 25, 02:55 UTC30m
2026-07-25 PDT5944 PHL → MDT Jul 25, 02:30 UTCJul 25, 02:55 UTC25m
2026-07-24 PDT6084 PHL → MDT Jul 24, 22:45 UTCJul 25, 00:00 UTC1h 15m
2026-07-24 PDT6084 PHL → MDT Jul 24, 22:41 UTCJul 24, 23:59 UTC1h 18m
2026-07-24 PDT5875 BGR → PHL Jul 24, 21:20 UTCJul 24, 21:40 UTC20m
2026-07-24 PDT5826 PHL → MSN Jul 24, 19:15 UTCJul 24, 20:00 UTC45m
2026-07-24 PDT5826 PHL → MSN Jul 24, 19:11 UTCJul 24, 20:00 UTC49m
2026-07-24 PDT5826 PHL → MSN Jul 24, 17:35 UTCJul 24, 18:05 UTC30m
2026-07-24 PDT5946 ILM → PHL Jul 24, 15:25 UTCJul 24, 15:50 UTC25m
2026-07-24 PDT5946 ILM → PHL Jul 24, 13:50 UTCJul 24, 14:15 UTC25m
2026-07-24 PDT5856 GSO → PHL Jul 24, 11:00 UTCJul 24, 11:35 UTC35m
2026-07-24 PDT5874 BOS → SYR Jul 24, 01:55 UTCJul 24, 02:20 UTC25m
2026-07-23 PDT5988 PHL → PVD Jul 23, 21:10 UTCJul 23, 22:20 UTC1h 10m
2026-07-23 PDT5988 PHL → PVD Jul 23, 21:07 UTCJul 23, 22:18 UTC1h 11m
2026-07-23 PDT5988 PHL → PVD Jul 23, 19:10 UTCJul 23, 20:10 UTC1h 0m
2026-07-23 PDT5813 - Jul 23, 16:50 UTCJul 23, 17:35 UTC45m
2026-07-23 PDT5813 HTS → CLT Jul 23, 16:43 UTCJul 23, 17:34 UTC51m
2026-07-23 PDT5813 - Jul 23, 15:10 UTCJul 23, 15:40 UTC30m
2026-07-23 PDT6105 PHL → YUL Jul 23, 12:35 UTCJul 23, 13:20 UTC45m
2026-07-23 PDT5787 CLT → CHA Jul 23, 01:55 UTCJul 23, 02:40 UTC45m
2026-07-22 PDT5825 PHL → GSP Jul 22, 23:50 UTCJul 23, 00:25 UTC35m
2026-07-22 PDT5825 PHL → GSP Jul 22, 22:15 UTCJul 22, 22:50 UTC35m
2026-07-22 PDT5819 BGR → PHL Jul 22, 20:05 UTCJul 22, 20:30 UTC25m
2026-07-22 PDT5819 BGR → PHL Jul 22, 18:30 UTCJul 22, 19:00 UTC30m
2026-07-22 PDT5819 BGR → PHL Jul 22, 15:25 UTCJul 22, 16:35 UTC1h 10m
2026-07-22 PDT5817 AVL → PHL Jul 22, 13:10 UTCJul 22, 13:55 UTC45m
2026-07-22 PDT5817 AVL → PHL Jul 22, 11:25 UTCJul 22, 11:50 UTC25m
2026-07-22 PDT5986 ILM → PHL Jul 22, 03:35 UTCJul 22, 04:05 UTC30m
2026-07-22 PDT5986 ILM → PHL Jul 22, 03:30 UTCJul 22, 04:06 UTC36m
2026-07-22 PDT5876 YUL → PHL Jul 22, 01:05 UTCJul 22, 02:40 UTC1h 35m
2026-07-21 PDT5876 YUL → PHL Jul 21, 22:55 UTCJul 22, 00:20 UTC1h 25m
2026-07-21 PDT5941 ORF → PHL Jul 21, 20:20 UTCJul 21, 20:45 UTC25m
2026-07-21 PDT5941 ORF → PHL Jul 21, 19:05 UTCJul 21, 19:25 UTC20m
2026-07-21 PDT6000 - Jul 21, 16:20 UTCJul 21, 17:25 UTC1h 5m
2026-07-21 PDT6000 TLH → CLT Jul 21, 16:15 UTCJul 21, 17:20 UTC1h 5m
2026-07-21 PDT6000 - Jul 21, 14:25 UTCJul 21, 15:30 UTC1h 5m
2026-07-21 PDT5933 PHL → MHT Jul 21, 11:30 UTCJul 21, 12:10 UTC40m
2026-07-20 PDT5926 PHL → TYS Jul 20, 22:35 UTCJul 20, 23:25 UTC50m

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 N645AE page for operator, model, and routing details .

Mode-S A877D3 frequently asked

What is Mode-S code A877D3?
A877D3 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N645AE.
Where is Mode-S A877D3 registered?
Mode-S code A877D3 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 A877D3 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 A877D3, octal 52073723, decimal 11,040,723.
What flights does A877D3 operate?
Mode-S A877D3 has broadcast 20 distinct callsigns, including PDT5802, PDT5963, PDT5946, PDT5941, PDT6003.