Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A8540B

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N636AE · EMBRAER ERJ-145 · operated by AMERICAN AIRLINES INC

Hex
A8540B
Octal
52052013
Decimal
11,031,563
Country
US
Tail
N636AE
Type
E145
Broadcasting now · callsign PDT5830 · 6,175 ft
Flights observed
716
Distinct callsigns
20
Country
US
Last broadcast
10h ago

Current position

A8540B is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A8540B 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
PDT5974 - 12 2026-07-05
PDT5805 - 11 2026-07-03
PDT5884 - 10 2026-07-10
PDT5840 - 10 2026-06-29
PDT6042 - 9 2026-06-22
PDT6032 - 9 2026-06-30
PDT6127 Piedmont Airlines 8 2026-06-11
PDT5980 Piedmont Airlines 8 2026-05-15
PDT6112 - 7 2026-06-30
PDT6054 - 7 2026-07-01
PDT6004 Piedmont Airlines 7 2026-05-08
PDT5942 Piedmont Airlines 7 2026-05-23
PDT5870 - 7 2026-06-14
PDT5861 - 7 2026-06-25
PDT5832 - 7 2026-07-01
PDT6126 - 6 2026-06-27
PDT6121 - 6 2026-07-06
PDT6097 - 6 2026-06-21
PDT6073 - 6 2026-07-03
PDT6026 Piedmont Airlines 6 2026-04-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 PDT5964 - Jul 14, 00:50 UTCJul 14, 01:25 UTC35m
2026-07-13 PDT6024 - Jul 13, 22:55 UTCJul 13, 23:35 UTC40m
2026-07-13 PDT6024 ALB → PHL Jul 13, 22:51 UTCJul 13, 23:35 UTC44m
2026-07-13 PDT6024 - Jul 13, 20:55 UTCJul 13, 21:45 UTC50m
2026-07-13 PDT6036 - Jul 13, 18:45 UTCJul 13, 19:30 UTC45m
2026-07-13 PDT6036 BDL → PHL Jul 13, 18:42 UTCJul 13, 19:27 UTC45m
2026-07-13 PDT6035 PSQ → BDL Jul 13, 17:15 UTCJul 13, 18:00 UTC45m
2026-07-13 PDT6122 - Jul 13, 15:35 UTCJul 13, 16:25 UTC50m
2026-07-13 PDT6122 - Jul 13, 14:00 UTCJul 13, 14:45 UTC45m
2026-07-13 PDT5904 - Jul 13, 11:20 UTCJul 13, 12:05 UTC45m
2026-07-13 PDT6090 PHL → ROC Jul 13, 02:40 UTCJul 13, 03:30 UTC50m
2026-07-13 PDT6034 - Jul 13, 00:05 UTCJul 13, 01:25 UTC1h 20m
2026-07-12 PDT6034 - Jul 12, 20:40 UTCJul 12, 22:15 UTC1h 35m
2026-07-12 PDT5951 - Jul 12, 17:35 UTCJul 12, 19:01 UTC1h 25m
2026-07-12 PDT5951 - Jul 12, 14:55 UTCJul 12, 16:25 UTC1h 30m
2026-07-12 PDT6029 - Jul 12, 12:01 UTCJul 12, 13:05 UTC1h 5m
2026-07-12 PDT6027 - Jul 12, 01:00 UTCJul 12, 02:05 UTC1h 5m
2026-07-11 PDT5895 - Jul 11, 22:10 UTCJul 11, 22:45 UTC35m
2026-07-11 PDT5895 - Jul 11, 20:20 UTCJul 11, 21:15 UTC55m
2026-07-11 PDT5951 - Jul 11, 18:00 UTCJul 11, 19:25 UTC1h 25m
2026-07-11 PDT5951 - Jul 11, 15:40 UTCJul 11, 17:05 UTC1h 25m
2026-07-11 PDT5887 - Jul 11, 12:30 UTCJul 11, 12:45 UTC15m
2026-07-11 PDT5887 YYZ → PHL Jul 11, 12:25 UTCJul 11, 13:26 UTC1h 1m
2026-07-11 PDT5864 PHL → YYZ Jul 11, 00:30 UTCJul 11, 01:50 UTC1h 20m
2026-07-10 PDT5884 - Jul 10, 21:30 UTCJul 10, 22:30 UTC1h 0m
2026-07-10 PDT5884 YYZ → PHL Jul 10, 21:29 UTCJul 10, 22:29 UTC1h 0m
2026-07-10 PDT5884 - Jul 10, 18:25 UTCJul 10, 19:25 UTC1h 0m
2026-07-10 PDT5848 - Jul 10, 15:30 UTCJul 10, 16:25 UTC55m
2026-07-10 PDT5848 - Jul 10, 13:10 UTCJul 10, 14:30 UTC1h 20m
2026-07-10 PDT6013 - Jul 10, 11:00 UTCJul 10, 11:25 UTC25m
2026-07-09 PDT5989 - Jul 9, 22:15 UTCJul 9, 23:35 UTC1h 20m
2026-07-09 PDT5858 - Jul 9, 19:35 UTCJul 9, 20:10 UTC35m
2026-07-09 PDT5858 - Jul 9, 18:05 UTCJul 9, 18:35 UTC30m
2026-07-09 PDT5946 - Jul 9, 15:25 UTCJul 9, 15:55 UTC30m
2026-07-09 PDT5946 TRI → CLT Jul 9, 15:23 UTCJul 9, 15:53 UTC30m
2026-07-09 PDT5946 - Jul 9, 14:05 UTCJul 9, 14:30 UTC25m
2026-07-09 PDT6089 - Jul 9, 11:05 UTCJul 9, 12:05 UTC1h 0m
2026-07-09 PDT6089 GNV → CLT Jul 9, 11:02 UTCJul 9, 12:05 UTC1h 3m
2026-07-08 PDT6102 - Jul 8, 21:45 UTCJul 8, 22:45 UTC1h 0m
2026-07-08 PDT5932 - Jul 8, 19:35 UTCJul 8, 20:35 UTC1h 0m
2026-07-08 PDT5932 TLH → CLT Jul 8, 19:30 UTCJul 8, 20:35 UTC1h 5m
2026-07-08 PDT5932 - Jul 8, 17:40 UTCJul 8, 18:40 UTC1h 0m
2026-07-08 PDT5950 - Jul 8, 15:25 UTCJul 8, 15:55 UTC30m
2026-07-08 PDT5950 - Jul 8, 13:45 UTCJul 8, 14:20 UTC35m
2026-07-08 PDT6010 - Jul 8, 10:15 UTCJul 8, 11:15 UTC1h 0m
2026-07-07 PDT5945 - Jul 7, 02:55 UTCJul 7, 03:20 UTC25m
2026-07-06 PDT6121 - Jul 6, 20:20 UTCJul 6, 21:25 UTC1h 5m
2026-07-06 PDT6121 - Jul 6, 17:40 UTCJul 6, 18:45 UTC1h 5m
2026-07-06 PDT6121 - Jul 6, 17:15 UTCJul 6, 17:35 UTC20m
2026-07-06 PDT5830 - Jul 6, 11:50 UTCJul 6, 12:35 UTC45m

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 N636AE page for operator, model, and routing details .

Mode-S A8540B frequently asked

What is Mode-S code A8540B?
A8540B is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N636AE.
Where is Mode-S A8540B registered?
Mode-S code A8540B 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 A8540B broadcasting right now?
Yes. Mode-S A8540B is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A8540B, octal 52052013, decimal 11,031,563.
What flights does A8540B operate?
Mode-S A8540B has broadcast 20 distinct callsigns, including PDT5974, PDT5805, PDT5884, PDT5840, PDT6042.