Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

ADA16B

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N978AP · CESSNA 172 Skyhawk · operated by AVIATION LEASING COMPANY LLC

Hex
ADA16B
Octal
53320553
Decimal
11,379,051
Country
US
Tail
N978AP
Type
C172
No current signal · last broadcast 13h ago
Flights observed
219
Distinct callsigns
1
Country
US
Last broadcast
13h ago

Last known position

Most recent position reported by Mode-S ADA16B.

Country allocation

The ICAO 24-bit address ADA16B 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
N978AP - 219 2026-07-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 N978AP - Jul 14, 03:40 UTCJul 14, 04:10 UTC30m
2026-07-14 N978AP - Jul 14, 01:30 UTCJul 14, 02:00 UTC30m
2026-07-14 N978AP - Jul 14, 00:15 UTCJul 14, 00:30 UTC15m
2026-07-13 N978AP RBK → HMT Jul 13, 23:30 UTCJul 14, 00:00 UTC30m
2026-07-13 N978AP SEE → RBK Jul 13, 16:15 UTCJul 13, 16:45 UTC30m
2026-07-12 N978AP - Jul 12, 22:10 UTCJul 12, 23:30 UTC1h 20m
2026-07-12 N978AP - Jul 12, 20:55 UTCJul 12, 22:00 UTC1h 5m
2026-07-12 N978AP - Jul 12, 17:01 UTCJul 12, 19:25 UTC2h 25m
2026-07-12 N978AP - Jul 12, 00:30 UTCJul 12, 01:05 UTC35m
2026-07-11 N978AP - Jul 11, 23:20 UTCJul 11, 23:35 UTC15m
2026-07-11 N978AP - Jul 11, 22:30 UTCJul 11, 22:50 UTC20m
2026-07-11 N978AP - Jul 11, 20:55 UTCJul 11, 21:30 UTC35m
2026-07-11 N978AP HMT → RBK Jul 11, 18:40 UTCJul 11, 19:20 UTC40m
2026-07-11 N978AP - Jul 11, 17:15 UTCJul 11, 18:25 UTC1h 10m
2026-07-11 N978AP - Jul 11, 01:55 UTCJul 11, 03:45 UTC1h 50m
2026-07-10 N978AP - Jul 10, 22:50 UTCJul 11, 00:40 UTC1h 50m
2026-07-10 N978AP - Jul 10, 20:00 UTCJul 10, 21:10 UTC1h 10m
2026-07-10 N978AP - Jul 10, 19:10 UTCJul 10, 19:55 UTC45m
2026-07-10 N978AP SEE → SEE Jul 10, 01:15 UTCJul 10, 02:20 UTC1h 5m
2026-07-09 N978AP SEE → SEE Jul 9, 21:40 UTCJul 9, 23:45 UTC2h 5m
2026-07-09 N978AP RBK → SEE Jul 9, 05:00 UTCJul 9, 05:30 UTC30m
2026-07-09 N978AP SEE → RBK Jul 9, 03:10 UTCJul 9, 03:45 UTC35m
2026-07-09 N978AP - Jul 9, 00:55 UTCJul 9, 01:45 UTC50m
2026-07-08 N978AP SEE → SEE Jul 8, 22:45 UTCJul 8, 23:20 UTC35m
2026-07-08 N978AP - Jul 8, 21:25 UTCJul 8, 21:50 UTC25m
2026-07-08 N978AP HMT → RBK Jul 8, 19:05 UTCJul 8, 19:50 UTC45m
2026-07-08 N978AP SEE → HMT Jul 8, 18:10 UTCJul 8, 18:55 UTC45m
2026-07-08 N978AP - Jul 8, 03:50 UTCJul 8, 04:30 UTC40m
2026-07-08 N978AP SEE → HMT Jul 8, 02:35 UTCJul 8, 03:40 UTC1h 5m
2026-07-08 N978AP SEE → SEE Jul 8, 00:50 UTCJul 8, 01:15 UTC25m
2026-07-07 N978AP SEE → SEE Jul 7, 20:05 UTCJul 7, 21:05 UTC1h 0m
2026-07-07 N978AP SEE → SEE Jul 7, 00:20 UTCJul 7, 01:30 UTC1h 10m
2026-07-07 N978AP SEE → SEE Jul 7, 00:05 UTCJul 7, 00:15 UTC10m
2026-07-06 N978AP - Jul 6, 22:40 UTCJul 6, 23:20 UTC40m
2026-07-06 N978AP SEE → HMT Jul 6, 21:40 UTCJul 6, 22:30 UTC50m
2026-07-03 N978AP RBK → SEE Jul 3, 19:40 UTCJul 3, 20:10 UTC30m
2026-07-03 N978AP - Jul 3, 18:35 UTCJul 3, 19:05 UTC30m
2026-07-03 N978AP SEE → HMT Jul 3, 17:40 UTCJul 3, 18:20 UTC40m
2026-07-03 N978AP HMT → SEE Jul 3, 03:30 UTCJul 3, 04:35 UTC1h 5m
2026-07-03 N978AP SEE → HMT Jul 3, 02:30 UTCJul 3, 03:25 UTC55m
2026-07-02 N978AP SEE → SEE Jul 2, 22:10 UTCJul 2, 22:55 UTC45m
2026-07-02 N978AP - Jul 2, 21:00 UTCJul 2, 21:25 UTC25m
2026-07-02 N978AP - Jul 2, 19:15 UTCJul 2, 19:50 UTC35m
2026-07-02 N978AP - Jul 2, 18:20 UTCJul 2, 19:05 UTC45m
2026-07-01 N978AP - Jul 1, 21:20 UTCJul 1, 22:35 UTC1h 15m
2026-06-30 N978AP - Jun 30, 22:00 UTCJun 30, 23:15 UTC1h 15m
2026-06-29 N978AP - Jun 29, 19:49 UTCJun 29, 20:35 UTC45m
2026-06-29 N978AP - Jun 29, 18:19 UTCJun 29, 19:35 UTC1h 15m
2026-06-28 N978AP - Jun 28, 23:04 UTCJun 29, 01:10 UTC2h 5m
2026-06-28 N978AP - Jun 28, 19:29 UTCJun 28, 21:59 UTC2h 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 N978AP page for operator, model, and routing details .

Mode-S ADA16B frequently asked

What is Mode-S code ADA16B?
ADA16B is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N978AP.
Where is Mode-S ADA16B registered?
Mode-S code ADA16B 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 ADA16B broadcasting right now?
No active broadcast right now. Last signal was 13h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex ADA16B, octal 53320553, decimal 11,379,051.
What flights does ADA16B operate?
Mode-S ADA16B has broadcast 1 distinct callsign, including N978AP.