Apparatus

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sensors Mode-S transponder

A5DF23

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N478DF · SIKORSKY UH-60 Black Hawk · operated by CALIFORNIA DEPT OF FORESTRY & FIRE PROTECTION

Hex
A5DF23
Octal
51357443
Decimal
10,870,563
Country
US
Tail
N478DF
Type
H60
No current signal · last broadcast 25d ago
Flights observed
103
Distinct callsigns
1
Country
US
Last broadcast
25d ago

Last known position

Most recent position reported by Mode-S A5DF23.

Country allocation

The ICAO 24-bit address A5DF23 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
CFR605 - 103 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 CFR605 - Jul 26, 22:10 UTCJul 26, 22:45 UTC35m
2026-07-26 CFR605 - Jul 26, 16:50 UTCJul 26, 17:15 UTC25m
2026-07-26 CFR605 - Jul 26, 03:20 UTCJul 26, 03:55 UTC35m
2026-07-21 CFR605 - Jul 21, 20:55 UTCJul 22, 00:05 UTC3h 10m
2026-07-20 CFR605 HMT → HMT Jul 20, 22:20 UTCJul 20, 23:55 UTC1h 34m
2026-07-20 CFR605 - Jul 20, 01:05 UTCJul 20, 01:45 UTC40m
2026-07-18 CFR605 - Jul 18, 20:00 UTCJul 18, 20:30 UTC30m
2026-07-18 CFR605 - Jul 18, 18:45 UTCJul 18, 19:00 UTC15m
2026-07-17 CFR605 - Jul 17, 21:44 UTCJul 17, 23:14 UTC1h 30m
2026-07-17 CFR605 - Jul 17, 18:10 UTCJul 17, 18:19 UTC10m
2026-07-17 CFR605 - Jul 17, 01:39 UTCJul 17, 03:30 UTC1h 50m
2026-07-16 CFR605 HMT → HMT Jul 16, 20:55 UTCJul 16, 23:29 UTC2h 35m
2026-07-16 CFR605 - Jul 16, 08:05 UTCJul 16, 08:35 UTC30m
2026-07-16 CFR605 - Jul 16, 03:15 UTCJul 16, 03:40 UTC25m
2026-07-16 CFR605 - Jul 16, 02:10 UTCJul 16, 02:35 UTC25m
2026-07-15 CFR605 - Jul 15, 23:40 UTCJul 16, 00:05 UTC25m
2026-07-15 CFR605 - Jul 15, 21:05 UTCJul 15, 21:15 UTC10m
2026-07-15 CFR605 - Jul 15, 19:20 UTCJul 15, 19:30 UTC10m
2026-07-14 CFR605 - Jul 14, 02:00 UTCJul 14, 02:20 UTC20m
2026-07-14 CFR605 - Jul 14, 00:55 UTCJul 14, 01:05 UTC10m
2026-07-13 CFR605 - Jul 13, 21:05 UTCJul 13, 21:40 UTC35m
2026-07-12 CFR605 - Jul 12, 23:30 UTCJul 13, 00:55 UTC1h 25m
2026-07-12 CFR605 HMT → HMT Jul 12, 17:50 UTCJul 12, 18:55 UTC1h 5m
2026-07-10 CFR605 HMT → HMT Jul 10, 23:35 UTCJul 11, 00:05 UTC30m
2026-07-10 CFR605 HMT → HMT Jul 10, 03:55 UTCJul 10, 04:25 UTC30m
2026-07-09 CFR605 - Jul 9, 23:10 UTCJul 10, 00:10 UTC1h 0m
2026-07-09 CFR605 - Jul 9, 21:20 UTCJul 9, 22:10 UTC50m
2026-07-09 CFR605 HMT → HMT Jul 9, 17:25 UTCJul 9, 17:40 UTC15m
2026-07-08 CFR605 HMT → HMT Jul 8, 15:55 UTCJul 8, 17:45 UTC1h 50m
2026-07-08 CFR605 HMT → HMT Jul 8, 02:45 UTCJul 8, 06:35 UTC3h 50m
2026-07-07 CFR605 - Jul 7, 22:15 UTCJul 8, 02:05 UTC3h 50m
2026-07-07 CFR605 HMT → HMT Jul 7, 03:15 UTCJul 7, 05:00 UTC1h 45m
2026-07-06 CFR605 - Jul 6, 22:40 UTCJul 7, 02:45 UTC4h 5m
2026-07-05 CFR605 HMT → HMT Jul 5, 03:15 UTCJul 5, 05:00 UTC1h 45m
2026-07-04 CFR605 - Jul 4, 22:00 UTCJul 4, 22:20 UTC20m
2026-07-04 CFR605 - Jul 4, 21:15 UTCJul 4, 21:25 UTC10m
2026-07-04 CFR605 - Jul 4, 02:20 UTCJul 4, 03:05 UTC45m
2026-07-03 CFR605 - Jul 3, 03:15 UTCJul 3, 03:55 UTC40m
2026-06-30 CFR605 HMT → HMT Jun 30, 23:00 UTCJul 1, 02:35 UTC3h 35m
2026-06-29 CFR605 - Jun 29, 00:39 UTCJun 29, 02:20 UTC1h 40m
2026-06-27 CFR605 HMT → HMT Jun 27, 21:34 UTCJun 28, 02:49 UTC5h 15m
2026-06-26 CFR605 - Jun 26, 21:30 UTCJun 26, 22:14 UTC45m
2026-06-22 CFR605 - Jun 22, 21:19 UTCJun 22, 23:55 UTC2h 35m
2026-06-22 CFR605 - Jun 22, 18:24 UTCJun 22, 20:14 UTC1h 50m
2026-06-18 CFR605 - Jun 18, 22:35 UTCJun 18, 23:00 UTC25m
2026-06-18 CFR605 - Jun 18, 21:40 UTCJun 18, 21:55 UTC15m
2026-06-18 CFR605 - Jun 18, 20:40 UTCJun 18, 20:50 UTC10m
2026-06-18 CFR605 HMT → HMT Jun 18, 03:15 UTCJun 18, 04:50 UTC1h 35m
2026-06-16 CFR605 - Jun 16, 21:05 UTCJun 17, 00:25 UTC3h 20m
2026-06-16 CFR605 HMT → HMT Jun 16, 02:54 UTCJun 16, 06:54 UTC4h 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 N478DF page for operator, model, and routing details .

Mode-S A5DF23 frequently asked

What is Mode-S code A5DF23?
A5DF23 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N478DF.
Where is Mode-S A5DF23 registered?
Mode-S code A5DF23 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 A5DF23 broadcasting right now?
No active broadcast right now. Last signal was 25d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A5DF23, octal 51357443, decimal 10,870,563.
What flights does A5DF23 operate?
Mode-S A5DF23 has broadcast 1 distinct callsign, including CFR605.