Apparatus

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sensors Mode-S transponder

A8AA77

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N658AE · EMBRAER ERJ-145 · operated by AMERICAN AIRLINES INC

Hex
A8AA77
Octal
52125167
Decimal
11,053,687
Country
US
Tail
N658AE
Type
E145
No current signal · last broadcast 3h ago
Flights observed
764
Distinct callsigns
20
Country
US
Last broadcast
3h ago

Last known position

Most recent position reported by Mode-S A8AA77.

Country allocation

The ICAO 24-bit address A8AA77 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
PDT5813 Piedmont Airlines 12 2026-06-19
PDT6095 Piedmont Airlines 11 2026-05-18
PDT6127 - 10 2026-06-25
PDT6110 Piedmont Airlines 9 2026-05-13
PDT6078 - 9 2026-07-14
PDT6004 - 9 2026-06-25
PDT5869 - 9 2026-07-08
PDT6054 Piedmont Airlines 8 2026-06-13
PDT6050 - 8 2026-06-22
PDT6026 - 8 2026-07-09
PDT5870 - 8 2026-06-13
PDT5824 - 8 2026-07-13
PDT6082 Piedmont Airlines 7 2026-06-16
PDT5976 Piedmont Airlines 7 2026-06-05
PDT5955 - 7 2026-06-14
PDT5940 - 7 2026-06-16
PDT5792 Piedmont Airlines 7 2026-06-08
PDT6130 - 6 2026-07-07
PDT6102 - 6 2026-07-03
PDT6092 Piedmont Airlines 6 2026-06-02

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-15 PDT5812 - Jul 15, 01:40 UTCJul 15, 02:10 UTC30m
2026-07-14 PDT6078 - Jul 14, 21:50 UTCJul 14, 23:05 UTC1h 14m
2026-07-14 PDT6078 - Jul 14, 19:45 UTCJul 14, 20:45 UTC1h 0m
2026-07-14 PDT5853 - Jul 14, 17:25 UTCJul 14, 18:00 UTC35m
2026-07-14 PDT5853 - Jul 14, 16:00 UTCJul 14, 16:30 UTC30m
2026-07-14 PDT5972 - Jul 14, 12:35 UTCJul 14, 13:55 UTC1h 20m
2026-07-14 PDT5970 - Jul 14, 00:55 UTCJul 14, 02:15 UTC1h 20m
2026-07-13 PDT6065 - Jul 13, 21:35 UTCJul 13, 22:45 UTC1h 10m
2026-07-13 PDT6065 ERI → CLT Jul 13, 21:29 UTCJul 13, 22:59 UTC1h 30m
2026-07-13 PDT6065 - Jul 13, 19:30 UTCJul 13, 20:35 UTC1h 5m
2026-07-13 PDT5824 - Jul 13, 16:25 UTCJul 13, 17:30 UTC1h 5m
2026-07-13 PDT5824 - Jul 13, 13:40 UTCJul 13, 14:50 UTC1h 10m
2026-07-13 PDT6009 - Jul 13, 10:50 UTCJul 13, 11:25 UTC35m
2026-07-13 PDT5812 - Jul 13, 01:40 UTCJul 13, 02:20 UTC40m
2026-07-12 PDT5851 - Jul 12, 23:30 UTCJul 13, 00:15 UTC45m
2026-07-12 PDT5851 - Jul 12, 21:05 UTCJul 12, 21:35 UTC30m
2026-07-12 PDT6069 - Jul 12, 19:10 UTCJul 12, 19:55 UTC45m
2026-07-12 PDT6069 EWN → CLT Jul 12, 19:04 UTCJul 12, 19:54 UTC50m
2026-07-12 PDT6069 - Jul 12, 17:30 UTCJul 12, 18:01 UTC30m
2026-07-12 PDT5820 - Jul 12, 15:20 UTCJul 12, 15:55 UTC35m
2026-07-12 PDT5820 - Jul 12, 13:35 UTCJul 12, 14:05 UTC30m
2026-07-12 PDT6098 - Jul 12, 11:05 UTCJul 12, 11:45 UTC40m
2026-07-12 PDT6071 - Jul 12, 03:40 UTCJul 12, 04:10 UTC30m
2026-07-12 PDT5814 - Jul 12, 00:35 UTCJul 12, 01:10 UTC35m
2026-07-11 PDT5814 - Jul 11, 22:55 UTCJul 11, 23:40 UTC45m
2026-07-11 PDT5858 - Jul 11, 19:20 UTCJul 11, 20:05 UTC45m
2026-07-11 PDT5858 - Jul 11, 17:45 UTCJul 11, 18:15 UTC30m
2026-07-11 PDT6099 - Jul 11, 15:20 UTCJul 11, 15:40 UTC20m
2026-07-11 PDT5800 - Jul 11, 13:10 UTCJul 11, 14:30 UTC1h 20m
2026-07-11 PDT5973 - Jul 11, 10:40 UTCJul 11, 11:20 UTC40m
2026-07-11 PDT5969 - Jul 11, 02:00 UTCJul 11, 02:35 UTC35m
2026-07-11 PDT5969 PHL → RIC Jul 11, 01:58 UTCJul 11, 02:34 UTC36m
2026-07-10 PDT5974 ART → PHL Jul 10, 22:50 UTCJul 10, 23:40 UTC50m
2026-07-10 PDT5974 - Jul 10, 20:55 UTCJul 10, 21:50 UTC55m
2026-07-10 PDT5915 - Jul 10, 16:30 UTCJul 10, 17:50 UTC1h 20m
2026-07-10 PDT5915 - Jul 10, 14:10 UTCJul 10, 15:45 UTC1h 35m
2026-07-10 PDT6029 - Jul 10, 12:00 UTCJul 10, 13:05 UTC1h 5m
2026-07-10 PDT6029 YUL → PHL Jul 10, 11:58 UTCJul 10, 13:10 UTC1h 12m
2026-07-10 PDT6027 PHL → YUL Jul 10, 03:05 UTCJul 10, 04:10 UTC1h 5m
2026-07-10 PDT6027 PHL → YUL Jul 10, 03:02 UTCJul 10, 04:10 UTC1h 8m
2026-07-10 PDT5884 YYZ → PHL Jul 10, 00:45 UTCJul 10, 01:40 UTC55m
2026-07-09 PDT5884 - Jul 9, 21:10 UTCJul 9, 21:45 UTC35m
2026-07-09 PDT5884 PHL → YYZ Jul 9, 21:10 UTCJul 9, 22:23 UTC1h 13m
2026-07-09 PDT6026 - Jul 9, 15:20 UTCJul 9, 16:30 UTC1h 10m
2026-07-09 PDT6026 ALB → PHL Jul 9, 15:17 UTCJul 9, 16:07 UTC50m
2026-07-09 PDT6026 PHL → ALB Jul 9, 13:55 UTCJul 9, 14:40 UTC45m
2026-07-08 PDT5918 - Jul 8, 23:20 UTCJul 8, 23:45 UTC25m
2026-07-08 PDT5918 - Jul 8, 21:55 UTCJul 8, 22:20 UTC25m
2026-07-08 PDT6005 - Jul 8, 20:00 UTCJul 8, 20:50 UTC50m
2026-07-08 PDT6005 ROA → PHL Jul 8, 19:57 UTCJul 8, 20:54 UTC57m

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 N658AE page for operator, model, and routing details .

Mode-S A8AA77 frequently asked

What is Mode-S code A8AA77?
A8AA77 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N658AE.
Where is Mode-S A8AA77 registered?
Mode-S code A8AA77 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 A8AA77 broadcasting right now?
No active broadcast right now. Last signal was 3h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A8AA77, octal 52125167, decimal 11,053,687.
What flights does A8AA77 operate?
Mode-S A8AA77 has broadcast 20 distinct callsigns, including PDT5813, PDT6095, PDT6127, PDT6110, PDT6078.