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sensors Mode-S transponder

AB7D21

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N8397L · PIPER PA-28-140/150/160/180 · operated by BIGUPS AVIATION 006 LLC

Hex
AB7D21
Octal
52676441
Decimal
11,238,689
Country
US
Tail
N8397L
Type
P28A
No current signal · last broadcast 22d ago
Flights observed
211
Distinct callsigns
1
Country
US
Last broadcast
22d ago

Last known position

Most recent position reported by Mode-S AB7D21.

Country allocation

The ICAO 24-bit address AB7D21 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 1 distinct

Callsign Airline Flights Last seen
N8397L - 211 2026-07-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 N8397L - Jul 13, 13:05 UTCJul 13, 13:25 UTC20m
2026-07-13 N8397L - Jul 13, 12:50 UTCJul 13, 13:00 UTC10m
2026-07-12 N8397L - Jul 12, 13:15 UTCJul 12, 14:45 UTC1h 30m
2026-07-11 N8397L - Jul 11, 21:30 UTCJul 11, 21:40 UTC10m
2026-07-11 N8397L - Jul 11, 18:00 UTCJul 11, 18:30 UTC30m
2026-07-11 N8397L - Jul 11, 17:00 UTCJul 11, 17:20 UTC20m
2026-07-11 N8397L - Jul 11, 13:30 UTCJul 11, 15:30 UTC2h 0m
2026-07-10 N8397L - Jul 10, 23:05 UTCJul 11, 00:40 UTC1h 35m
2026-07-10 N8397L - Jul 10, 20:00 UTCJul 10, 21:10 UTC1h 10m
2026-07-10 N8397L - Jul 10, 17:45 UTCJul 10, 18:30 UTC45m
2026-07-10 N8397L - Jul 10, 14:30 UTCJul 10, 16:45 UTC2h 15m
2026-07-09 N8397L - Jul 9, 23:25 UTCJul 9, 23:50 UTC25m
2026-07-09 N8397L - Jul 9, 20:20 UTCJul 9, 20:45 UTC25m
2026-07-08 N8397L - Jul 8, 19:40 UTCJul 8, 20:10 UTC30m
2026-07-08 N8397L - Jul 8, 18:25 UTCJul 8, 18:55 UTC30m
2026-07-08 N8397L - Jul 8, 16:20 UTCJul 8, 16:55 UTC35m
2026-07-08 N8397L - Jul 8, 16:05 UTCJul 8, 16:15 UTC10m
2026-07-08 N8397L - Jul 8, 13:35 UTCJul 8, 14:50 UTC1h 15m
2026-07-07 N8397L - Jul 7, 15:25 UTCJul 7, 15:50 UTC25m
2026-07-07 N8397L - Jul 7, 13:40 UTCJul 7, 14:05 UTC25m
2026-07-06 N8397L - Jul 6, 18:10 UTCJul 6, 18:30 UTC20m
2026-07-06 N8397L - Jul 6, 16:10 UTCJul 6, 17:05 UTC55m
2026-07-06 N8397L - Jul 6, 14:40 UTCJul 6, 15:20 UTC40m
2026-07-06 N8397L - Jul 6, 13:20 UTCJul 6, 13:50 UTC30m
2026-07-04 N8397L - Jul 4, 13:55 UTCJul 4, 14:40 UTC45m
2026-07-03 N8397L - Jul 3, 13:50 UTCJul 3, 14:55 UTC1h 5m
2026-07-03 N8397L - Jul 3, 01:45 UTCJul 3, 01:55 UTC10m
2026-07-03 N8397L - Jul 3, 00:40 UTCJul 3, 00:55 UTC15m
2026-07-02 N8397L - Jul 2, 20:40 UTCJul 2, 21:05 UTC25m
2026-07-02 N8397L - Jul 2, 18:25 UTCJul 2, 19:45 UTC1h 20m
2026-07-02 N8397L - Jul 2, 15:30 UTCJul 2, 17:05 UTC1h 35m
2026-07-02 N8397L - Jul 2, 01:00 UTCJul 2, 01:35 UTC35m
2026-07-01 N8397L - Jul 1, 22:20 UTCJul 1, 23:50 UTC1h 30m
2026-07-01 N8397L - Jul 1, 20:30 UTCJul 1, 21:15 UTC45m
2026-07-01 N8397L - Jul 1, 19:10 UTCJul 1, 19:45 UTC35m
2026-07-01 N8397L - Jul 1, 15:55 UTCJul 1, 17:00 UTC1h 5m
2026-07-01 N8397L - Jul 1, 14:30 UTCJul 1, 15:15 UTC45m
2026-07-01 N8397L - Jul 1, 01:45 UTCJul 1, 03:20 UTC1h 35m
2026-06-30 N8397L - Jun 30, 21:45 UTCJun 30, 22:30 UTC45m
2026-06-30 N8397L - Jun 30, 20:30 UTCJun 30, 21:05 UTC35m
2026-06-30 N8397L - Jun 30, 18:00 UTCJun 30, 19:05 UTC1h 5m
2026-06-30 N8397L - Jun 30, 17:00 UTCJun 30, 17:20 UTC20m
2026-06-29 N8397L - Jun 29, 21:34 UTCJun 29, 21:54 UTC20m
2026-06-29 N8397L - Jun 29, 15:30 UTCJun 29, 17:14 UTC1h 45m
2026-06-29 N8397L - Jun 29, 13:09 UTCJun 29, 14:34 UTC1h 25m
2026-06-28 N8397L - Jun 28, 17:04 UTCJun 28, 17:55 UTC50m
2026-06-28 N8397L - Jun 28, 15:09 UTCJun 28, 15:14 UTC5m
2026-06-28 N8397L - Jun 28, 14:34 UTCJun 28, 15:05 UTC30m
2026-06-27 N8397L - Jun 27, 13:24 UTCJun 27, 15:14 UTC1h 50m
2026-06-25 N8397L - Jun 25, 16:59 UTCJun 25, 18:29 UTC1h 30m

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 N8397L page for operator, model, and routing details .

Mode-S AB7D21 frequently asked

What is Mode-S code AB7D21?
AB7D21 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N8397L.
Where is Mode-S AB7D21 registered?
Mode-S code AB7D21 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 AB7D21 broadcasting right now?
No active broadcast right now. Last signal was 22d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AB7D21, octal 52676441, decimal 11,238,689.
What flights does AB7D21 operate?
Mode-S AB7D21 has broadcast 1 distinct callsign, including N8397L.