Apparatus

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sensors Mode-S transponder

A1AB98

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N20668 · CESSNA 172 Skyhawk · operated by SAFETY IN MOTION FLIGHT CENTER

Hex
A1AB98
Octal
50325630
Decimal
10,595,224
Country
US
Tail
N20668
Type
C172
Broadcasting now · callsign N20668 · -100 ft
Flights observed
243
Distinct callsigns
1
Country
US
Last broadcast
5d ago

Current position

A1AB98 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A1AB98 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
N20668 - 243 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 N20668 - Jul 26, 21:45 UTCJul 26, 22:00 UTC15m
2026-07-26 N20668 - Jul 26, 18:25 UTCJul 26, 19:40 UTC1h 15m
2026-07-25 N20668 - Jul 25, 23:50 UTCJul 26, 01:05 UTC1h 15m
2026-07-25 N20668 - Jul 25, 00:00 UTCJul 25, 00:20 UTC20m
2026-07-24 N20668 - Jul 24, 22:50 UTCJul 24, 23:20 UTC30m
2026-07-24 N20668 - Jul 24, 20:35 UTCJul 24, 21:35 UTC1h 0m
2026-07-24 N20668 - Jul 24, 00:55 UTCJul 24, 01:35 UTC40m
2026-07-23 N20668 - Jul 23, 23:00 UTCJul 23, 23:35 UTC35m
2026-07-23 N20668 - Jul 23, 00:40 UTCJul 23, 01:35 UTC55m
2026-07-22 N20668 - Jul 22, 17:45 UTCJul 22, 18:35 UTC50m
2026-07-21 N20668 - Jul 21, 22:40 UTCJul 21, 23:35 UTC55m
2026-07-21 N20668 - Jul 21, 20:45 UTCJul 21, 21:25 UTC40m
2026-07-21 N20668 - Jul 21, 17:50 UTCJul 21, 18:40 UTC50m
2026-07-21 N20668 - Jul 21, 15:15 UTCJul 21, 16:40 UTC1h 25m
2026-07-21 N20668 - Jul 21, 00:35 UTCJul 21, 01:50 UTC1h 15m
2026-07-20 N20668 - Jul 20, 23:00 UTCJul 20, 23:20 UTC20m
2026-07-20 N20668 - Jul 20, 20:35 UTCJul 20, 21:40 UTC1h 5m
2026-07-20 N20668 - Jul 20, 17:45 UTCJul 20, 18:40 UTC55m
2026-07-20 N20668 - Jul 20, 00:45 UTCJul 20, 01:30 UTC45m
2026-07-19 N20668 - Jul 19, 22:40 UTCJul 19, 23:40 UTC1h 0m
2026-07-19 N20668 - Jul 19, 20:30 UTCJul 19, 21:55 UTC1h 25m
2026-07-19 N20668 - Jul 19, 17:55 UTCJul 19, 19:10 UTC1h 15m
2026-07-19 N20668 - Jul 19, 15:45 UTCJul 19, 16:40 UTC55m
2026-07-18 N20668 - Jul 18, 22:35 UTCJul 18, 23:45 UTC1h 10m
2026-07-18 N20668 - Jul 18, 20:30 UTCJul 18, 21:30 UTC1h 0m
2026-07-18 N20668 - Jul 18, 00:29 UTCJul 18, 01:20 UTC50m
2026-07-17 N20668 - Jul 17, 20:44 UTCJul 17, 21:34 UTC50m
2026-07-17 N20668 - Jul 17, 15:49 UTCJul 17, 16:44 UTC55m
2026-07-16 N20668 - Jul 16, 02:25 UTCJul 16, 03:35 UTC1h 10m
2026-07-16 N20668 - Jul 16, 00:35 UTCJul 16, 01:35 UTC1h 0m
2026-07-15 N20668 - Jul 15, 22:50 UTCJul 15, 23:45 UTC55m
2026-07-15 N20668 - Jul 15, 20:35 UTCJul 15, 21:40 UTC1h 5m
2026-07-15 N20668 - Jul 15, 17:30 UTCJul 15, 18:35 UTC1h 5m
2026-07-15 N20668 - Jul 15, 15:45 UTCJul 15, 16:40 UTC55m
2026-07-15 N20668 - Jul 15, 05:50 UTCJul 15, 07:25 UTC1h 35m
2026-07-15 N20668 - Jul 15, 00:40 UTCJul 15, 02:25 UTC1h 45m
2026-07-14 N20668 - Jul 14, 20:30 UTCJul 14, 21:25 UTC55m
2026-07-14 N20668 - Jul 14, 17:45 UTCJul 14, 18:35 UTC50m
2026-07-14 N20668 - Jul 14, 15:40 UTCJul 14, 16:40 UTC1h 0m
2026-07-14 N20668 - Jul 14, 02:25 UTCJul 14, 03:10 UTC45m
2026-07-14 N20668 - Jul 14, 00:50 UTCJul 14, 01:40 UTC50m
2026-07-13 N20668 - Jul 13, 22:50 UTCJul 13, 23:50 UTC1h 0m
2026-07-13 N20668 - Jul 13, 17:50 UTCJul 13, 18:50 UTC1h 0m
2026-07-13 N20668 - Jul 13, 15:50 UTCJul 13, 16:35 UTC45m
2026-07-13 N20668 - Jul 13, 01:01 UTCJul 13, 01:35 UTC35m
2026-07-12 N20668 - Jul 12, 22:35 UTCJul 12, 23:25 UTC50m
2026-07-12 N20668 - Jul 12, 20:25 UTCJul 12, 21:05 UTC40m
2026-07-12 N20668 - Jul 12, 18:05 UTCJul 12, 19:25 UTC1h 20m
2026-07-12 N20668 - Jul 12, 15:35 UTCJul 12, 16:10 UTC35m
2026-07-12 N20668 - Jul 12, 00:55 UTCJul 12, 01:25 UTC30m

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 N20668 page for operator, model, and routing details .

Mode-S A1AB98 frequently asked

What is Mode-S code A1AB98?
A1AB98 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N20668.
Where is Mode-S A1AB98 registered?
Mode-S code A1AB98 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 A1AB98 broadcasting right now?
Yes. Mode-S A1AB98 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A1AB98, octal 50325630, decimal 10,595,224.
What flights does A1AB98 operate?
Mode-S A1AB98 has broadcast 1 distinct callsign, including N20668.