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sensors Mode-S transponder

AC990B

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N9100H · CESSNA 172 Skyhawk · operated by HASTINGS STEPHEN J

Hex
AC990B
Octal
53114413
Decimal
11,311,371
Country
US
Tail
N9100H
Type
C172
No current signal · last broadcast 1d ago
Flights observed
252
Distinct callsigns
1
Country
US
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S AC990B.

Country allocation

The ICAO 24-bit address AC990B 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
N9100H - 252 2026-07-12

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-12 N9100H - Jul 12, 20:45 UTCJul 12, 21:45 UTC1h 0m
2026-07-11 N9100H - Jul 11, 20:30 UTCJul 11, 22:05 UTC1h 35m
2026-07-11 N9100H - Jul 11, 02:10 UTCJul 11, 02:20 UTC10m
2026-07-10 N9100H - Jul 10, 22:25 UTCJul 10, 23:20 UTC55m
2026-07-10 N9100H - Jul 10, 21:35 UTCJul 10, 22:20 UTC45m
2026-07-08 N9100H - Jul 8, 20:25 UTCJul 8, 21:40 UTC1h 15m
2026-07-08 N9100H - Jul 8, 18:40 UTCJul 8, 19:40 UTC1h 0m
2026-07-08 N9100H - Jul 8, 16:30 UTCJul 8, 17:55 UTC1h 25m
2026-07-07 N9100H - Jul 7, 21:00 UTCJul 7, 21:45 UTC45m
2026-07-07 N9100H FRN → PAQ Jul 7, 18:10 UTCJul 7, 18:35 UTC25m
2026-07-07 N9100H - Jul 7, 17:30 UTCJul 7, 17:50 UTC20m
2026-07-06 N9100H - Jul 6, 03:10 UTCJul 6, 05:20 UTC2h 10m
2026-07-05 N9100H - Jul 5, 17:40 UTCJul 5, 18:25 UTC45m
2026-07-03 N9100H - Jul 3, 03:45 UTCJul 3, 04:50 UTC1h 5m
2026-07-03 N9100H - Jul 3, 02:15 UTCJul 3, 03:40 UTC1h 25m
2026-07-03 N9100H - Jul 3, 01:55 UTCJul 3, 02:10 UTC15m
2026-07-02 N9100H - Jul 2, 23:15 UTCJul 3, 00:00 UTC45m
2026-07-02 N9100H ENN → TKA Jul 2, 21:30 UTCJul 2, 23:10 UTC1h 40m
2026-07-02 N9100H - Jul 2, 16:50 UTCJul 2, 21:10 UTC4h 20m
2026-07-02 N9100H - Jul 2, 04:25 UTCJul 2, 05:50 UTC1h 25m
2026-07-02 N9100H - Jul 2, 03:40 UTCJul 2, 04:20 UTC40m
2026-07-02 N9100H - Jul 2, 03:05 UTCJul 2, 03:35 UTC30m
2026-07-01 N9100H - Jul 1, 23:50 UTCJul 2, 01:35 UTC1h 45m
2026-07-01 N9100H - Jul 1, 22:05 UTCJul 1, 22:55 UTC50m
2026-07-01 N9100H - Jul 1, 20:55 UTCJul 1, 21:50 UTC55m
2026-07-01 N9100H PAQ → PAQ Jul 1, 18:30 UTCJul 1, 19:40 UTC1h 10m
2026-07-01 N9100H - Jul 1, 15:40 UTCJul 1, 17:20 UTC1h 40m
2026-07-01 N9100H - Jul 1, 04:15 UTCJul 1, 04:40 UTC25m
2026-07-01 N9100H - Jul 1, 03:50 UTCJul 1, 04:00 UTC10m
2026-07-01 N9100H MRI → MRI Jul 1, 03:35 UTCJul 1, 03:40 UTC5m
2026-07-01 N9100H - Jul 1, 03:20 UTCJul 1, 03:30 UTC10m
2026-07-01 N9100H - Jul 1, 03:05 UTCJul 1, 03:15 UTC10m
2026-07-01 N9100H - Jul 1, 02:25 UTCJul 1, 02:45 UTC20m
2026-06-30 N9100H - Jun 30, 21:30 UTCJun 30, 23:05 UTC1h 35m
2026-06-30 N9100H PAQ → PAQ Jun 30, 18:45 UTCJun 30, 19:00 UTC15m
2026-06-30 N9100H PAQ → PAQ Jun 30, 01:25 UTCJun 30, 02:10 UTC45m
2026-06-29 N9100H PAQ → PAQ Jun 29, 23:05 UTCJun 29, 23:54 UTC50m
2026-06-26 N9100H PAQ → PAQ Jun 26, 15:29 UTCJun 26, 16:35 UTC1h 5m
2026-06-26 N9100H - Jun 26, 02:50 UTCJun 26, 04:34 UTC1h 45m
2026-06-25 N9100H - Jun 25, 22:45 UTCJun 26, 00:24 UTC1h 40m
2026-06-25 N9100H - Jun 25, 20:45 UTCJun 25, 21:40 UTC55m
2026-06-25 N9100H PAQ → PAQ Jun 25, 18:45 UTCJun 25, 19:44 UTC1h 0m
2026-06-25 N9100H TKA → PAQ Jun 25, 03:15 UTCJun 25, 03:59 UTC45m
2026-06-25 N9100H - Jun 25, 01:50 UTCJun 25, 02:49 UTC1h 0m
2026-06-24 N9100H - Jun 24, 20:35 UTCJun 24, 21:29 UTC55m
2026-06-24 N9100H - Jun 24, 18:15 UTCJun 24, 18:34 UTC20m
2026-06-24 N9100H - Jun 24, 17:25 UTCJun 24, 17:34 UTC10m
2026-06-23 N9100H PAQ → PAQ Jun 23, 20:15 UTCJun 23, 20:24 UTC10m
2026-06-22 N9100H PAQ → PAQ Jun 22, 18:40 UTCJun 22, 19:49 UTC1h 10m
2026-06-22 N9100H PAQ → PAQ Jun 22, 16:45 UTCJun 22, 17:44 UTC1h 0m

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 N9100H page for operator, model, and routing details .

Mode-S AC990B frequently asked

What is Mode-S code AC990B?
AC990B is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N9100H.
Where is Mode-S AC990B registered?
Mode-S code AC990B 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 AC990B broadcasting right now?
No active broadcast right now. Last signal was 1d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AC990B, octal 53114413, decimal 11,311,371.
What flights does AC990B operate?
Mode-S AC990B has broadcast 1 distinct callsign, including N9100H.