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sensors Mode-S transponder

A28ADF

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N263HP · operated by TEXTRON AVIATION INC

Hex
A28ADF
Octal
50505337
Decimal
10,652,383
Country
US
Tail
N263HP
Type
C208
Broadcasting now · callsign CHP51 · 125 ft
Flights observed
188
Distinct callsigns
2
Country
US
Last broadcast
Jul 25, 21:35 UTC

Current position

A28ADF is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A28ADF 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 2 distinct

Callsign Airline Flights Last seen
CHP51 - 170 2026-07-25
N263HP - 18 2026-04-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 CHP51 FUL → FUL Jul 25, 17:05 UTCJul 25, 21:35 UTC4h 30m
2026-07-25 CHP51 - Jul 25, 07:00 UTCJul 25, 07:50 UTC50m
2026-07-25 CHP51 FUL → FUL Jul 25, 04:05 UTCJul 25, 06:05 UTC2h 0m
2026-07-24 CHP51 - Jul 24, 23:55 UTCJul 25, 02:05 UTC2h 10m
2026-07-24 CHP51 - Jul 24, 20:55 UTCJul 24, 21:35 UTC40m
2026-07-24 CHP51 FUL → FUL Jul 24, 03:15 UTCJul 24, 04:35 UTC1h 20m
2026-07-24 CHP51 FUL → FUL Jul 24, 00:10 UTCJul 24, 01:35 UTC1h 25m
2026-07-23 CHP51 - Jul 23, 06:15 UTCJul 23, 06:35 UTC20m
2026-07-23 CHP51 FUL → FUL Jul 23, 02:45 UTCJul 23, 05:10 UTC2h 25m
2026-07-22 CHP51 - Jul 22, 23:30 UTCJul 23, 01:25 UTC1h 55m
2026-07-22 CHP51 - Jul 22, 20:20 UTCJul 22, 22:00 UTC1h 40m
2026-07-22 CHP51 - Jul 22, 04:05 UTCJul 22, 05:20 UTC1h 15m
2026-07-21 CHP51 FUL → FUL Jul 21, 14:40 UTCJul 21, 15:15 UTC35m
2026-07-20 CHP51 - Jul 20, 18:30 UTCJul 20, 20:20 UTC1h 50m
2026-07-20 CHP51 - Jul 20, 04:55 UTCJul 20, 06:20 UTC1h 25m
2026-07-19 CHP51 - Jul 19, 03:15 UTCJul 19, 05:20 UTC2h 5m
2026-07-18 CHP51 - Jul 18, 05:45 UTCJul 18, 08:00 UTC2h 15m
2026-07-18 CHP51 FUL → FUL Jul 18, 02:29 UTCJul 18, 04:55 UTC2h 26m
2026-07-18 CHP51 - Jul 18, 01:00 UTCJul 18, 01:10 UTC10m
2026-07-13 CHP51 - Jul 13, 06:05 UTCJul 13, 06:15 UTC10m
2026-07-13 CHP51 - Jul 13, 04:35 UTCJul 13, 05:31 UTC55m
2026-07-12 CHP51 FUL → FUL Jul 12, 07:25 UTCJul 12, 08:25 UTC1h 0m
2026-07-12 CHP51 FUL → FUL Jul 12, 02:05 UTCJul 12, 04:50 UTC2h 45m
2026-07-11 CHP51 - Jul 11, 22:50 UTCJul 12, 00:45 UTC1h 55m
2026-07-11 CHP51 FUL → FUL Jul 11, 03:50 UTCJul 11, 06:40 UTC2h 50m
2026-07-11 CHP51 - Jul 11, 00:10 UTCJul 11, 03:01 UTC2h 50m
2026-07-10 CHP51 - Jul 10, 06:20 UTCJul 10, 07:25 UTC1h 5m
2026-07-10 CHP51 FUL → FUL Jul 10, 03:45 UTCJul 10, 05:25 UTC1h 40m
2026-07-10 CHP51 - Jul 10, 00:55 UTCJul 10, 03:00 UTC2h 5m
2026-07-09 CHP51 - Jul 9, 23:40 UTCJul 10, 00:10 UTC30m
2026-07-09 CHP51 - Jul 9, 20:50 UTCJul 9, 22:45 UTC1h 55m
2026-07-09 CHP51 CLD → FUL Jul 9, 19:50 UTCJul 9, 20:15 UTC25m
2026-07-09 CHP51 - Jul 9, 17:00 UTCJul 9, 17:25 UTC25m
2026-07-09 CHP51 - Jul 9, 03:35 UTCJul 9, 05:50 UTC2h 15m
2026-07-09 CHP51 - Jul 9, 00:05 UTCJul 9, 01:55 UTC1h 50m
2026-07-08 CHP51 CLD → FUL Jul 8, 22:30 UTCJul 8, 23:10 UTC40m
2026-07-08 CHP51 - Jul 8, 19:35 UTCJul 8, 20:30 UTC55m
2026-07-08 CHP51 FUL → FUL Jul 8, 04:25 UTCJul 8, 06:55 UTC2h 30m
2026-07-08 CHP51 - Jul 8, 02:35 UTCJul 8, 02:55 UTC20m
2026-07-08 CHP51 - Jul 8, 00:10 UTCJul 8, 01:35 UTC1h 25m
2026-07-07 CHP51 FUL → FUL Jul 7, 04:15 UTCJul 7, 05:00 UTC45m
2026-07-05 CHP51 - Jul 5, 15:55 UTCJul 5, 18:50 UTC2h 55m
2026-07-04 CHP51 - Jul 4, 15:35 UTCJul 4, 19:40 UTC4h 5m
2026-07-04 CHP51 - Jul 4, 07:30 UTCJul 4, 08:10 UTC40m
2026-07-04 CHP51 - Jul 4, 04:45 UTCJul 4, 06:35 UTC1h 50m
2026-07-04 CHP51 FUL → FUL Jul 4, 00:20 UTCJul 4, 03:05 UTC2h 45m
2026-07-03 CHP51 FUL → FUL Jul 3, 03:25 UTCJul 3, 06:05 UTC2h 40m
2026-07-02 CHP51 - Jul 2, 23:35 UTCJul 3, 00:35 UTC1h 0m
2026-07-02 CHP51 - Jul 2, 00:00 UTCJul 2, 03:35 UTC3h 35m
2026-06-29 CHP51 FUL → FUL Jun 29, 19:24 UTCJun 29, 20:04 UTC40m

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 N263HP page for operator, model, and routing details .

Mode-S A28ADF frequently asked

What is Mode-S code A28ADF?
A28ADF is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N263HP.
Where is Mode-S A28ADF registered?
Mode-S code A28ADF 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 A28ADF broadcasting right now?
Yes. Mode-S A28ADF is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A28ADF, octal 50505337, decimal 10,652,383.
What flights does A28ADF operate?
Mode-S A28ADF has broadcast 2 distinct callsigns, including CHP51, N263HP.