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sensors Mode-S transponder

A8B8B9

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N661JA · EMBRAER ERJ-145 · operated by AMERICAN AIRLINES INC

Hex
A8B8B9
Octal
52134271
Decimal
11,057,337
Country
US
Tail
N661JA
Type
E145
No current signal · last broadcast 4h ago
Flights observed
822
Distinct callsigns
20
Country
US
Last broadcast
4h ago

Last known position

Most recent position reported by Mode-S A8B8B9.

Country allocation

The ICAO 24-bit address A8B8B9 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
PDT6080 - 13 2026-07-05
PDT6016 - 13 2026-06-25
PDT6067 - 10 2026-07-13
PDT5806 - 10 2026-06-30
PDT5796 Piedmont Airlines 10 2026-05-20
PDT6119 Piedmont Airlines 9 2026-05-27
PDT6064 - 9 2026-07-06
PDT5874 - 9 2026-07-12
PDT5810 Piedmont Airlines 9 2026-06-12
PDT5968 Piedmont Airlines 8 2026-05-17
PDT5845 - 8 2026-07-01
PDT5814 Piedmont Airlines 8 2026-06-06
PDT5808 - 8 2026-07-04
PDT5791 - 8 2026-07-03
PDT6114 - 7 2026-06-18
PDT6069 - 7 2026-07-03
PDT6065 Piedmont Airlines 7 2026-05-31
PDT6024 - 7 2026-06-29
PDT5853 - 7 2026-07-08
PDT5818 - 7 2026-07-04

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 PDT5787 - Jul 14, 00:45 UTCJul 14, 01:25 UTC40m
2026-07-13 PDT6067 - Jul 13, 22:20 UTCJul 13, 23:35 UTC1h 15m
2026-07-13 PDT6067 - Jul 13, 20:15 UTCJul 13, 21:15 UTC1h 0m
2026-07-13 PDT5819 - Jul 13, 18:30 UTCJul 13, 19:00 UTC30m
2026-07-13 PDT5819 - Jul 13, 15:50 UTCJul 13, 16:10 UTC20m
2026-07-13 PDT6033 - Jul 13, 13:15 UTCJul 13, 13:45 UTC30m
2026-07-13 PDT6033 - Jul 13, 11:45 UTCJul 13, 12:10 UTC25m
2026-07-13 PDT5954 - Jul 13, 09:20 UTCJul 13, 10:00 UTC40m
2026-07-13 PDT5954 TYS → CLT Jul 13, 09:18 UTCJul 13, 09:59 UTC41m
2026-07-13 PDT5909 - Jul 13, 03:40 UTCJul 13, 04:10 UTC30m
2026-07-13 PDT6032 - Jul 13, 01:25 UTCJul 13, 01:55 UTC30m
2026-07-12 PDT6032 - Jul 12, 23:45 UTCJul 13, 00:10 UTC25m
2026-07-12 PDT5831 - Jul 12, 21:15 UTCJul 12, 21:50 UTC35m
2026-07-12 PDT5831 - Jul 12, 19:15 UTCJul 12, 19:50 UTC35m
2026-07-12 PDT5838 - Jul 12, 16:10 UTCJul 12, 17:30 UTC1h 20m
2026-07-12 PDT5838 - Jul 12, 14:05 UTCJul 12, 15:20 UTC1h 15m
2026-07-12 PDT5856 - Jul 12, 10:40 UTCJul 12, 11:10 UTC30m
2026-07-12 PDT5874 - Jul 12, 02:25 UTCJul 12, 02:50 UTC25m
2026-07-12 PDT5891 - Jul 12, 00:15 UTCJul 12, 00:35 UTC20m
2026-07-12 PDT5891 GSO → CLT Jul 12, 00:09 UTCJul 12, 00:36 UTC27m
2026-07-11 PDT5891 - Jul 11, 22:50 UTCJul 11, 23:15 UTC25m
2026-07-11 PDT5889 - Jul 11, 21:05 UTCJul 11, 21:35 UTC30m
2026-07-11 PDT5889 - Jul 11, 19:25 UTCJul 11, 20:10 UTC45m
2026-07-11 PDT6129 - Jul 11, 16:30 UTCJul 11, 17:45 UTC1h 15m
2026-07-11 PDT6129 - Jul 11, 14:00 UTCJul 11, 15:15 UTC1h 15m
2026-07-11 PDT5833 - Jul 11, 10:40 UTCJul 11, 11:55 UTC1h 15m
2026-07-11 PDT6109 - Jul 11, 03:05 UTCJul 11, 03:25 UTC20m
2026-07-11 PDT6109 PHL → MDT Jul 11, 03:05 UTCJul 11, 03:23 UTC18m
2026-07-11 PDT5857 - Jul 11, 00:35 UTCJul 11, 01:20 UTC45m
2026-07-11 PDT5857 BDL → PHL Jul 11, 00:31 UTCJul 11, 01:20 UTC49m
2026-07-10 PDT5857 - Jul 10, 23:10 UTCJul 10, 23:50 UTC40m
2026-07-10 PDT6025 - Jul 10, 20:50 UTCJul 10, 21:55 UTC1h 5m
2026-07-10 PDT6023 - Jul 10, 17:40 UTCJul 10, 18:55 UTC1h 15m
2026-07-10 PDT5908 - Jul 10, 14:55 UTCJul 10, 16:05 UTC1h 10m
2026-07-10 PDT5908 GSP → PHL Jul 10, 14:51 UTCJul 10, 16:10 UTC1h 19m
2026-07-10 PDT5799 - Jul 10, 13:40 UTCJul 10, 13:50 UTC10m
2026-07-10 PDT5955 - Jul 10, 10:35 UTCJul 10, 11:10 UTC35m
2026-07-10 PDT5971 - Jul 10, 03:10 UTCJul 10, 03:50 UTC40m
2026-07-10 PDT6102 - Jul 10, 00:50 UTCJul 10, 01:55 UTC1h 5m
2026-07-09 PDT6102 - Jul 9, 23:10 UTCJul 10, 00:05 UTC55m
2026-07-09 PDT6131 - Jul 9, 20:55 UTCJul 9, 21:25 UTC30m
2026-07-09 PDT6131 - Jul 9, 19:00 UTCJul 9, 19:15 UTC15m
2026-07-09 PDT5813 - Jul 9, 16:50 UTCJul 9, 17:25 UTC35m
2026-07-09 PDT5813 HTS → CLT Jul 9, 16:43 UTCJul 9, 17:24 UTC41m
2026-07-09 PDT5813 - Jul 9, 15:10 UTCJul 9, 15:50 UTC40m
2026-07-09 PDT5972 - Jul 9, 12:25 UTCJul 9, 13:40 UTC1h 15m
2026-07-09 PDT5972 MOB → CLT Jul 9, 12:20 UTCJul 9, 13:39 UTC1h 19m
2026-07-09 PDT5970 - Jul 9, 00:50 UTCJul 9, 02:05 UTC1h 15m
2026-07-08 PDT6067 - Jul 8, 21:45 UTCJul 8, 22:45 UTC1h 0m
2026-07-08 PDT6067 EVV → CLT Jul 8, 21:40 UTCJul 8, 22:42 UTC1h 2m

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 N661JA page for operator, model, and routing details .

Mode-S A8B8B9 frequently asked

What is Mode-S code A8B8B9?
A8B8B9 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N661JA.
Where is Mode-S A8B8B9 registered?
Mode-S code A8B8B9 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 A8B8B9 broadcasting right now?
No active broadcast right now. Last signal was 4h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A8B8B9, octal 52134271, decimal 11,057,337.
What flights does A8B8B9 operate?
Mode-S A8B8B9 has broadcast 20 distinct callsigns, including PDT6080, PDT6016, PDT6067, PDT5806, PDT5796.