Apparatus

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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 Jul 26, 22:30 UTC
Flights observed
785
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:30 UTC

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
PDT6120 - 10 2026-07-15
PDT6073 - 10 2026-06-16
PDT5924 - 10 2026-07-17
PDT6015 Piedmont Airlines 9 2026-06-16
PDT5825 - 9 2026-06-29
PDT6116 Piedmont Airlines 8 2026-07-23
PDT6011 - 8 2026-07-03
PDT5847 - 8 2026-07-06
PDT6133 - 7 2026-07-10
PDT6022 Piedmont Airlines 7 2026-07-18
PDT6018 Piedmont Airlines 7 2026-07-23
PDT5952 - 7 2026-07-15
PDT5895 - 7 2026-07-05
PDT5868 Piedmont Airlines 7 2026-07-19
PDT5830 Piedmont Airlines 7 2026-06-01
PDT5816 - 7 2026-07-14
PDT5801 Piedmont Airlines 7 2026-07-18
PDT6132 - 6 2026-06-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 PDT5918 TVC → ORD Jul 26, 22:05 UTCJul 26, 22:30 UTC25m
2026-07-26 PDT5861 BDL → PHL Jul 26, 19:30 UTCJul 26, 20:30 UTC1h 0m
2026-07-26 PDT5861 BDL → PHL Jul 26, 17:15 UTCJul 26, 18:15 UTC1h 0m
2026-07-26 PDT5982 RIC → PHL Jul 26, 15:10 UTCJul 26, 15:50 UTC40m
2026-07-26 PDT5982 RIC → PHL Jul 26, 15:04 UTCJul 26, 15:50 UTC46m
2026-07-26 PDT5982 RIC → PHL Jul 26, 13:35 UTCJul 26, 14:15 UTC40m
2026-07-26 PDT6111 GSP → PHL Jul 26, 10:40 UTCJul 26, 11:25 UTC45m
2026-07-25 PDT5857 ORD → ALB Jul 25, 22:40 UTCJul 25, 23:15 UTC35m
2026-07-25 PDT5857 ORD → ALB Jul 25, 22:35 UTCJul 25, 23:15 UTC40m
2026-07-25 PDT5861 BDL → PHL Jul 25, 19:45 UTCJul 25, 20:40 UTC55m
2026-07-25 PDT5861 BDL → PHL Jul 25, 19:45 UTCJul 25, 20:59 UTC1h 14m
2026-07-25 PDT5861 BDL → PHL Jul 25, 17:05 UTCJul 25, 18:10 UTC1h 5m
2026-07-25 PDT6126 MKE → PHL Jul 25, 15:00 UTCJul 25, 15:50 UTC50m
2026-07-25 PDT6126 MKE → PHL Jul 25, 13:25 UTCJul 25, 14:15 UTC50m
2026-07-24 PDT5942 DTW → PHL Jul 24, 23:50 UTCJul 25, 00:55 UTC1h 5m
2026-07-24 PDT5942 DTW → PHL Jul 24, 22:00 UTCJul 24, 22:55 UTC55m
2026-07-24 PDT6005 CLE → PHL Jul 24, 19:20 UTCJul 24, 20:15 UTC55m
2026-07-24 PDT5900 ORD → TYS Jul 24, 17:40 UTCJul 24, 18:15 UTC35m
2026-07-24 PDT6101 YUL → PHL Jul 24, 15:35 UTCJul 24, 16:05 UTC30m
2026-07-24 PDT6101 YUL → PHL Jul 24, 15:31 UTCJul 24, 16:03 UTC32m
2026-07-24 PDT6030 PHL → CVG Jul 24, 13:25 UTCJul 24, 13:50 UTC25m
2026-07-24 PDT6030 PHL → CVG Jul 24, 13:22 UTCJul 24, 14:01 UTC39m
2026-07-24 PDT5808 EVV → CLT Jul 24, 10:32 UTCJul 24, 11:33 UTC1h 1m
2026-07-24 PDT5818 CLT → EVV Jul 24, 01:05 UTCJul 24, 02:10 UTC1h 5m
2026-07-23 PDT6018 CAE → PHL Jul 23, 23:05 UTCJul 23, 23:35 UTC30m
2026-07-23 PDT6018 CAE → PHL Jul 23, 22:00 UTCJul 23, 22:30 UTC30m
2026-07-23 PDT6047 FWA → PHL Jul 23, 19:45 UTCJul 23, 20:05 UTC20m
2026-07-23 PDT6047 FWA → PHL Jul 23, 18:25 UTCJul 23, 18:45 UTC20m
2026-07-23 PDT6017 BUF → PHL Jul 23, 16:50 UTCJul 23, 17:20 UTC30m
2026-07-23 PDT6017 BUF → PHL Jul 23, 15:30 UTCJul 23, 16:05 UTC35m
2026-07-23 PDT6048 CLT → EVV Jul 23, 12:55 UTCJul 23, 13:20 UTC25m
2026-07-23 PDT6048 CLT → EVV Jul 23, 11:35 UTCJul 23, 11:50 UTC15m
2026-07-23 PDT5842 ROA → PHL Jul 23, 09:20 UTCJul 23, 09:55 UTC35m
2026-07-23 PDT5827 TYS → PHL Jul 23, 03:00 UTCJul 23, 03:35 UTC35m
2026-07-23 PDT5827 TYS → PHL Jul 23, 02:57 UTCJul 23, 03:33 UTC36m
2026-07-23 PDT6116 PHL → YYZ Jul 23, 00:45 UTCJul 23, 01:20 UTC35m
2026-07-22 PDT6116 PHL → YYZ Jul 22, 20:40 UTCJul 22, 21:05 UTC25m
2026-07-22 PDT6077 MSN → PHL Jul 22, 19:05 UTCJul 22, 19:30 UTC25m
2026-07-22 PDT6077 MSN → PHL Jul 22, 18:00 UTCJul 22, 18:15 UTC15m
2026-07-22 PDT6068 DTW → PHL Jul 22, 15:10 UTCJul 22, 16:00 UTC50m
2026-07-22 PDT6068 DTW → PHL Jul 22, 13:20 UTCJul 22, 13:50 UTC30m
2026-07-22 PDT5883 SBY → CLT Jul 22, 11:10 UTCJul 22, 11:55 UTC45m
2026-07-20 PDT6109 - Jul 20, 23:55 UTCJul 21, 00:20 UTC25m
2026-07-20 PDT6109 PHL → MDT Jul 20, 23:54 UTCJul 21, 00:17 UTC23m
2026-07-20 PDT6025 BOS → ROC Jul 20, 20:55 UTCJul 20, 22:05 UTC1h 10m
2026-07-20 PDT6203 TVC → ORD Jul 20, 18:10 UTCJul 20, 19:25 UTC1h 15m
2026-07-20 PDT5908 MHT → PHL Jul 20, 15:20 UTCJul 20, 16:30 UTC1h 10m
2026-07-20 PDT5799 BOS → ROC Jul 20, 14:00 UTCJul 20, 14:10 UTC10m
2026-07-20 PDT5799 BOS → ROC Jul 20, 13:55 UTCJul 20, 14:13 UTC18m
2026-07-20 PDT5981 CAE → PHL Jul 20, 10:45 UTCJul 20, 11:15 UTC30m

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 Jul 26, 22:30 UTC.
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, PDT6120, PDT6073, PDT5924.