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sensors Mode-S transponder

A66420

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N5102U · CESSNA 172R Cutlass RG · operated by HUDNALL ROBERT S

Hex
A66420
Octal
51462040
Decimal
10,904,608
Country
US
Tail
N5102U
Type
C72R
No current signal · last broadcast Jul 26, 14:05 UTC
Flights observed
102
Distinct callsigns
1
Country
US
Last broadcast
Jul 26, 14:05 UTC

Last known position

Most recent position reported by Mode-S A66420.

Country allocation

The ICAO 24-bit address A66420 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
N5102U - 98 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 N5102U - Jul 26, 11:05 UTCJul 26, 14:05 UTC3h 0m
2026-07-23 N5102U - Jul 23, 18:30 UTCJul 23, 18:45 UTC15m
2026-07-23 N5102U - Jul 23, 16:20 UTCJul 23, 16:35 UTC15m
2026-07-23 N5102U - Jul 23, 09:55 UTCJul 23, 15:15 UTC5h 20m
2026-07-21 N5102U - Jul 21, 16:05 UTCJul 21, 16:20 UTC15m
2026-07-21 N5102U - Jul 21, 09:50 UTCJul 21, 15:20 UTC5h 30m
2026-07-20 N5102U - Jul 20, 17:50 UTCJul 20, 20:05 UTC2h 15m
2026-07-20 N5102U - Jul 20, 15:55 UTCJul 20, 17:20 UTC1h 25m
2026-07-20 N5102U - Jul 20, 11:35 UTCJul 20, 15:05 UTC3h 30m
2026-07-19 N5102U - Jul 19, 13:05 UTCJul 19, 14:00 UTC55m
2026-07-19 N5102U - Jul 19, 10:50 UTCJul 19, 13:00 UTC2h 10m
2026-07-16 N5102U - Jul 16, 15:10 UTCJul 16, 18:15 UTC3h 5m
2026-07-16 N5102U - Jul 16, 13:30 UTCJul 16, 14:25 UTC55m
2026-07-16 N5102U - Jul 16, 10:59 UTCJul 16, 12:44 UTC1h 45m
2026-07-16 N5102U - Jul 16, 09:45 UTCJul 16, 10:25 UTC40m
2026-07-15 - - Jul 15, 17:00 UTCJul 15, 17:10 UTC10m
2026-07-15 N5102U - Jul 15, 14:50 UTCJul 15, 15:10 UTC20m
2026-07-15 N5102U - Jul 15, 10:45 UTCJul 15, 14:00 UTC3h 15m
2026-07-15 N5102U - Jul 15, 09:25 UTCJul 15, 10:00 UTC35m
2026-07-14 N5102U - Jul 14, 16:50 UTCJul 14, 19:55 UTC3h 5m
2026-07-13 N5102U - Jul 13, 09:25 UTCJul 13, 13:40 UTC4h 15m
2026-07-12 N5102U - Jul 12, 11:35 UTCJul 12, 14:30 UTC2h 55m
2026-07-09 - - Jul 9, 18:55 UTCJul 9, 19:10 UTC15m
2026-07-09 N5102U - Jul 9, 17:25 UTCJul 9, 18:00 UTC35m
2026-07-09 N5102U - Jul 9, 16:20 UTCJul 9, 16:50 UTC30m
2026-07-09 N5102U - Jul 9, 14:45 UTCJul 9, 15:05 UTC20m
2026-07-09 N5102U - Jul 9, 13:20 UTCJul 9, 13:50 UTC30m
2026-07-09 N5102U - Jul 9, 12:00 UTCJul 9, 12:45 UTC45m
2026-07-09 N5102U - Jul 9, 11:10 UTCJul 9, 11:30 UTC20m
2026-07-09 N5102U - Jul 9, 09:45 UTCJul 9, 10:30 UTC45m
2026-07-08 N5102U - Jul 8, 14:50 UTCJul 8, 19:35 UTC4h 45m
2026-07-07 N5102U - Jul 7, 17:15 UTCJul 7, 18:00 UTC45m
2026-07-07 N5102U - Jul 7, 15:45 UTCJul 7, 16:00 UTC15m
2026-07-06 N5102U - Jul 6, 17:35 UTCJul 6, 19:40 UTC2h 5m
2026-07-06 N5102U - Jul 6, 12:45 UTCJul 6, 15:05 UTC2h 20m
2026-07-06 N5102U - Jul 6, 09:15 UTCJul 6, 11:35 UTC2h 20m
2026-07-05 N5102U - Jul 5, 10:45 UTCJul 5, 14:05 UTC3h 20m
2026-07-01 N5102U - Jul 1, 16:55 UTCJul 1, 17:15 UTC20m
2026-07-01 N5102U - Jul 1, 13:20 UTCJul 1, 14:50 UTC1h 30m
2026-07-01 N5102U - Jul 1, 09:15 UTCJul 1, 12:50 UTC3h 35m
2026-06-30 N5102U - Jun 30, 14:00 UTCJun 30, 19:10 UTC5h 10m
2026-06-30 N5102U - Jun 30, 09:15 UTCJun 30, 13:20 UTC4h 5m
2026-06-29 N5102U - Jun 29, 18:49 UTCJun 29, 20:00 UTC1h 10m
2026-06-29 N5102U - Jun 29, 15:45 UTCJun 29, 18:10 UTC2h 25m
2026-06-28 N5102U - Jun 28, 13:10 UTCJun 28, 13:25 UTC15m
2026-06-25 N5102U - Jun 25, 18:00 UTCJun 25, 18:39 UTC40m
2026-06-25 N5102U - Jun 25, 15:50 UTCJun 25, 17:20 UTC1h 30m
2026-06-25 - - Jun 25, 14:50 UTCJun 25, 15:15 UTC25m
2026-06-25 N5102U - Jun 25, 09:29 UTCJun 25, 14:20 UTC4h 50m
2026-06-24 N5102U - Jun 24, 13:40 UTCJun 24, 14:04 UTC25m

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 N5102U page for operator, model, and routing details .

Mode-S A66420 frequently asked

What is Mode-S code A66420?
A66420 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N5102U.
Where is Mode-S A66420 registered?
Mode-S code A66420 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 A66420 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 14:05 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A66420, octal 51462040, decimal 10,904,608.
What flights does A66420 operate?
Mode-S A66420 has broadcast 1 distinct callsign, including N5102U.