Apparatus

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sensors Mode-S transponder

AC857B

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N906AE · EMBRAER ERJ-145 · operated by AMERICAN AIRLINES INC

Hex
AC857B
Octal
53102573
Decimal
11,306,363
Country
US
Tail
N906AE
Type
E145
No current signal · last broadcast Jul 26, 21:30 UTC
Flights observed
917
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:30 UTC

Last known position

Most recent position reported by Mode-S AC857B.

Country allocation

The ICAO 24-bit address AC857B 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
PDT6114 - 17 2026-06-16
PDT5877 - 11 2026-07-14
PDT5840 - 11 2026-07-13
PDT5942 Piedmont Airlines 10 2026-07-26
PDT5910 - 10 2026-06-19
PDT5789 - 10 2026-07-06
PDT6123 Piedmont Airlines 9 2026-06-13
PDT6118 - 9 2026-07-14
PDT5982 Piedmont Airlines 9 2026-06-07
PDT5946 - 9 2026-06-30
PDT5918 - 9 2026-07-04
PDT5878 Piedmont Airlines 9 2026-07-21
PDT5859 Piedmont Airlines 9 2026-07-02
PDT5854 Piedmont Airlines 9 2026-07-24
PDT5848 Piedmont Airlines 9 2026-07-25
PDT5785 - 9 2026-07-08
PDT6026 - 8 2026-07-13
PDT5843 - 8 2026-06-15
PDT5821 Piedmont Airlines 8 2026-06-03
PDT5811 Piedmont Airlines 8 2026-05-19

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 PDT5974 PHL → SYR Jul 26, 20:35 UTCJul 26, 21:30 UTC55m
2026-07-26 PDT5974 PHL → SYR Jul 26, 18:30 UTCJul 26, 19:20 UTC50m
2026-07-26 PDT6121 HSV → CLT Jul 26, 16:55 UTCJul 26, 17:35 UTC40m
2026-07-26 PDT6121 HSV → CLT Jul 26, 15:40 UTCJul 26, 16:15 UTC35m
2026-07-26 PDT6001 PHL → SYR Jul 26, 11:45 UTCJul 26, 12:45 UTC1h 0m
2026-07-26 PDT6001 PHL → SYR Jul 26, 11:40 UTCJul 26, 12:42 UTC1h 2m
2026-07-26 PDT5942 DTW → PHL Jul 26, 00:50 UTCJul 26, 01:45 UTC55m
2026-07-26 PDT5942 DTW → PHL Jul 26, 00:45 UTCJul 26, 01:37 UTC52m
2026-07-25 PDT6038 PHL → ALB Jul 25, 22:15 UTCJul 25, 23:40 UTC1h 25m
2026-07-25 PDT6038 PHL → ALB Jul 25, 22:13 UTCJul 25, 23:43 UTC1h 30m
2026-07-25 PDT6038 PHL → ALB Jul 25, 20:15 UTCJul 25, 21:25 UTC1h 10m
2026-07-25 PDT5848 CHO → CLT Jul 25, 18:05 UTCJul 25, 19:05 UTC1h 0m
2026-07-25 PDT5848 CHO → CLT Jul 25, 17:53 UTCJul 25, 19:02 UTC1h 9m
2026-07-25 PDT5848 CHO → CLT Jul 25, 15:25 UTCJul 25, 16:35 UTC1h 10m
2026-07-25 PDT6095 SCE → PHL Jul 25, 12:25 UTCJul 25, 13:05 UTC40m
2026-07-25 PDT6103 ROC → BOS Jul 25, 02:20 UTCJul 25, 03:05 UTC45m
2026-07-24 PDT5801 ORD → AZO Jul 24, 22:35 UTCJul 24, 23:50 UTC1h 15m
2026-07-24 PDT5801 ORD → AZO Jul 24, 22:33 UTCJul 24, 23:49 UTC1h 16m
2026-07-24 PDT5801 ORD → AZO Jul 24, 20:15 UTCJul 24, 21:40 UTC1h 25m
2026-07-24 PDT5963 PHL → ILM Jul 24, 18:35 UTCJul 24, 18:45 UTC10m
2026-07-24 PDT5963 PHL → ILM Jul 24, 18:29 UTCJul 24, 18:53 UTC24m
2026-07-24 PDT5963 PHL → ILM Jul 24, 17:25 UTCJul 24, 17:45 UTC20m
2026-07-24 PDT5925 BUF → PHL Jul 24, 15:30 UTCJul 24, 16:20 UTC50m
2026-07-24 PDT5925 BUF → PHL Jul 24, 13:40 UTCJul 24, 14:40 UTC1h 0m
2026-07-24 PDT5854 ALB → PHL Jul 24, 10:30 UTCJul 24, 11:15 UTC45m
2026-07-24 PDT5854 ALB → PHL Jul 24, 10:29 UTCJul 24, 11:17 UTC48m
2026-07-24 PDT5850 GSP → PHL Jul 24, 00:00 UTCJul 24, 00:45 UTC45m
2026-07-23 PDT5850 GSP → PHL Jul 23, 23:58 UTCJul 24, 00:39 UTC41m
2026-07-23 PDT5895 CHO → PHL Jul 23, 21:45 UTCJul 23, 22:20 UTC35m
2026-07-23 PDT5895 CHO → PHL Jul 23, 21:40 UTCJul 23, 22:20 UTC40m
2026-07-23 PDT5895 CHO → PHL Jul 23, 19:55 UTCJul 23, 20:35 UTC40m
2026-07-23 PDT6115 ISP → PHL Jul 23, 17:00 UTCJul 23, 18:15 UTC1h 15m
2026-07-23 PDT5994 - Jul 23, 15:30 UTCJul 23, 15:50 UTC20m
2026-07-23 PDT5992 GSP → PHL Jul 23, 11:45 UTCJul 23, 12:10 UTC25m
2026-07-23 PDT5992 GSP → PHL Jul 23, 11:43 UTCJul 23, 12:10 UTC27m
2026-07-23 PDT6019 YYZ → PHL Jul 23, 02:50 UTCJul 23, 03:15 UTC25m
2026-07-23 PDT6019 YYZ → PHL Jul 23, 02:48 UTCJul 23, 03:18 UTC30m
2026-07-23 PDT6074 TYS → PHL Jul 23, 00:30 UTCJul 23, 01:00 UTC30m
2026-07-22 PDT6074 TYS → PHL Jul 22, 23:20 UTCJul 22, 23:45 UTC25m
2026-07-22 PDT5941 ORF → PHL Jul 22, 21:15 UTCJul 22, 21:45 UTC30m
2026-07-22 PDT5941 ORF → PHL Jul 22, 21:12 UTCJul 22, 21:43 UTC31m
2026-07-22 PDT5941 ORF → PHL Jul 22, 20:05 UTCJul 22, 20:25 UTC20m
2026-07-22 PDT5810 MHT → PHL Jul 22, 16:30 UTCJul 22, 17:25 UTC55m
2026-07-22 PDT5810 MHT → PHL Jul 22, 14:35 UTCJul 22, 15:35 UTC1h 0m
2026-07-22 PDT6086 - Jul 22, 12:05 UTCJul 22, 13:30 UTC1h 25m
2026-07-22 PDT6097 ORF → PHL Jul 22, 01:25 UTCJul 22, 03:15 UTC1h 50m
2026-07-21 PDT6056 LEX → PHL Jul 21, 22:20 UTCJul 21, 23:05 UTC45m
2026-07-21 PDT6056 LEX → PHL Jul 21, 20:45 UTCJul 21, 21:20 UTC35m
2026-07-21 PDT6064 CLT → CAE Jul 21, 17:55 UTCJul 21, 18:55 UTC1h 0m
2026-07-21 PDT6064 CLT → CAE Jul 21, 15:45 UTCJul 21, 16:50 UTC1h 5m

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 N906AE page for operator, model, and routing details .

Mode-S AC857B frequently asked

What is Mode-S code AC857B?
AC857B is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N906AE.
Where is Mode-S AC857B registered?
Mode-S code AC857B 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 AC857B broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:30 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AC857B, octal 53102573, decimal 11,306,363.
What flights does AC857B operate?
Mode-S AC857B has broadcast 20 distinct callsigns, including PDT6114, PDT5877, PDT5840, PDT5942, PDT5910.