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sensors Mode-S transponder

A857C2

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N637AE · EMBRAER ERJ-145 · operated by AMERICAN AIRLINES INC

Hex
A857C2
Octal
52053702
Decimal
11,032,514
Country
US
Tail
N637AE
Type
E145
No current signal · last broadcast 2h ago
Flights observed
696
Distinct callsigns
20
Country
US
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S A857C2.

Country allocation

The ICAO 24-bit address A857C2 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
PDT6024 Piedmont Airlines 13 2026-06-11
PDT6124 - 11 2026-07-07
PDT6073 - 10 2026-06-16
PDT6015 Piedmont Airlines 9 2026-06-16
PDT5825 - 9 2026-06-29
PDT6120 - 8 2026-07-02
PDT6011 - 8 2026-07-03
PDT5847 - 8 2026-07-06
PDT6133 - 7 2026-07-10
PDT5895 - 7 2026-07-05
PDT5830 Piedmont Airlines 7 2026-06-01
PDT5816 - 7 2026-07-14
PDT6132 - 6 2026-06-26
PDT6125 Piedmont Airlines 6 2026-06-02
PDT6116 - 6 2026-07-13
PDT6054 Piedmont Airlines 6 2026-05-11
PDT6000 - 6 2026-07-01
PDT5924 Piedmont Airlines 6 2026-06-04
PDT5836 - 6 2026-06-26
PDT5798 - 6 2026-06-29

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 PDT5816 - Jul 14, 01:05 UTCJul 14, 02:15 UTC1h 10m
2026-07-13 PDT6116 - Jul 13, 23:20 UTCJul 14, 00:10 UTC50m
2026-07-13 PDT5826 - Jul 13, 19:25 UTCJul 13, 20:10 UTC45m
2026-07-13 PDT5826 LYH → CLT Jul 13, 19:22 UTCJul 13, 20:06 UTC44m
2026-07-13 PDT5826 - Jul 13, 18:00 UTCJul 13, 18:30 UTC30m
2026-07-13 PDT5946 - Jul 13, 15:25 UTCJul 13, 16:00 UTC35m
2026-07-13 PDT5946 - Jul 13, 14:05 UTCJul 13, 14:30 UTC25m
2026-07-13 PDT5866 - Jul 13, 09:10 UTCJul 13, 10:00 UTC50m
2026-07-13 PDT5866 CHA → CLT Jul 13, 09:09 UTCJul 13, 10:00 UTC51m
2026-07-13 PDT6085 - Jul 13, 03:40 UTCJul 13, 04:30 UTC50m
2026-07-13 PDT6085 CLT → CHA Jul 13, 03:34 UTCJul 13, 04:28 UTC54m
2026-07-13 PDT5804 - Jul 13, 01:05 UTCJul 13, 01:50 UTC45m
2026-07-12 PDT5804 - Jul 12, 23:45 UTCJul 13, 00:20 UTC35m
2026-07-12 PDT5868 - Jul 12, 19:35 UTCJul 12, 20:25 UTC50m
2026-07-12 PDT5868 - Jul 12, 17:55 UTCJul 12, 18:40 UTC45m
2026-07-12 PDT6101 - Jul 12, 15:30 UTCJul 12, 16:01 UTC30m
2026-07-12 PDT6101 AVL → CLT Jul 12, 15:30 UTCJul 12, 16:01 UTC31m
2026-07-12 PDT6030 - Jul 12, 13:50 UTCJul 12, 14:05 UTC15m
2026-07-12 PDT5981 - Jul 12, 10:55 UTCJul 12, 11:25 UTC30m
2026-07-12 PDT5981 AGS → CLT Jul 12, 10:54 UTCJul 12, 11:24 UTC30m
2026-07-12 PDT5991 - Jul 12, 03:10 UTCJul 12, 03:35 UTC25m
2026-07-12 PDT6049 - Jul 12, 00:15 UTCJul 12, 01:00 UTC45m
2026-07-12 PDT6049 CHA → CLT Jul 12, 00:14 UTCJul 12, 00:59 UTC45m
2026-07-11 PDT6049 - Jul 11, 22:40 UTCJul 11, 23:25 UTC45m
2026-07-11 PDT5998 - Jul 11, 19:40 UTCJul 11, 20:05 UTC25m
2026-07-11 PDT6094 - Jul 11, 14:35 UTCJul 11, 15:50 UTC1h 15m
2026-07-11 PDT6001 - Jul 11, 11:40 UTCJul 11, 12:40 UTC1h 0m
2026-07-11 PDT6001 MHT → PHL Jul 11, 11:38 UTCJul 11, 12:44 UTC1h 6m
2026-07-11 PDT5966 - Jul 11, 04:01 UTCJul 11, 04:55 UTC55m
2026-07-11 PDT5966 PHL → MHT Jul 11, 04:00 UTCJul 11, 04:58 UTC58m
2026-07-11 PDT6092 - Jul 11, 00:55 UTCJul 11, 01:40 UTC45m
2026-07-10 PDT6092 PHL → PIT Jul 10, 23:20 UTCJul 11, 00:05 UTC45m
2026-07-10 PDT6133 - Jul 10, 21:10 UTCJul 10, 22:15 UTC1h 5m
2026-07-10 PDT6133 - Jul 10, 17:50 UTCJul 10, 18:45 UTC55m
2026-07-10 PDT9654 - Jul 10, 15:20 UTCJul 10, 16:40 UTC1h 20m
2026-07-09 PDT5888 - Jul 9, 16:00 UTCJul 9, 17:45 UTC1h 45m
2026-07-09 PDT5929 - Jul 9, 13:55 UTCJul 9, 14:20 UTC25m
2026-07-09 PDT9980 - Jul 9, 12:05 UTCJul 9, 13:05 UTC1h 0m
2026-07-08 PDT5839 - Jul 8, 19:55 UTCJul 8, 20:50 UTC55m
2026-07-08 PDT5839 MGM → CLT Jul 8, 19:48 UTCJul 8, 20:51 UTC1h 3m
2026-07-08 PDT5839 - Jul 8, 17:50 UTCJul 8, 18:45 UTC55m
2026-07-08 PDT6099 - Jul 8, 15:25 UTCJul 8, 15:45 UTC20m
2026-07-08 PDT6099 GSP → CLT Jul 8, 15:20 UTCJul 8, 15:48 UTC28m
2026-07-08 PDT5800 - Jul 8, 12:50 UTCJul 8, 14:30 UTC1h 40m
2026-07-08 PDT5854 - Jul 8, 10:35 UTCJul 8, 11:25 UTC50m
2026-07-08 PDT5854 ALB → PHL Jul 8, 10:30 UTCJul 8, 11:19 UTC49m
2026-07-08 PDT5877 - Jul 8, 03:20 UTCJul 8, 04:00 UTC40m
2026-07-08 PDT5877 PHL → ALB Jul 8, 03:19 UTCJul 8, 03:59 UTC40m
2026-07-08 PDT6114 - Jul 8, 01:00 UTCJul 8, 01:50 UTC50m
2026-07-07 PDT6114 PHL → BUF Jul 7, 22:00 UTCJul 7, 22:55 UTC55m

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 N637AE page for operator, model, and routing details .

Mode-S A857C2 frequently asked

What is Mode-S code A857C2?
A857C2 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N637AE.
Where is Mode-S A857C2 registered?
Mode-S code A857C2 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 A857C2 broadcasting right now?
No active broadcast right now. Last signal was 2h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A857C2, octal 52053702, decimal 11,032,514.
What flights does A857C2 operate?
Mode-S A857C2 has broadcast 20 distinct callsigns, including PDT6024, PDT6124, PDT6073, PDT6015, PDT5825.