Apparatus

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sensors Mode-S transponder

A4C031

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N405LC · LOCKHEED C-130 Hercules · operated by LYNDEN AIR CARGO LLC

Hex
A4C031
Octal
51140061
Decimal
10,797,105
Country
US
Tail
N405LC
Type
C130
No current signal · last broadcast 1d ago
Flights observed
82
Distinct callsigns
2
Country
US
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S A4C031.

Country allocation

The ICAO 24-bit address A4C031 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
LYC405 Lynden Air Cargo 72 2026-06-01
LYC517 Lynden Air Cargo 10 2026-04-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-01 LYC405 PAE → ELP Jun 1, 23:10 UTCJun 2, 00:20 UTC1h 10m
2026-06-01 LYC405 PAE → ELP Jun 1, 14:25 UTCJun 1, 15:30 UTC1h 5m
2026-05-29 LYC405 PAE → ELP May 29, 16:20 UTCMay 29, 18:05 UTC1h 45m
2026-05-29 LYC405 PAE → ELP May 29, 13:30 UTCMay 29, 15:15 UTC1h 45m
2026-05-21 LYC405 PAE → ELP May 21, 05:55 UTCMay 21, 06:00 UTC5m
2026-05-21 LYC405 PAE → ELP May 21, 02:55 UTCMay 21, 05:20 UTC2h 25m
2026-05-20 LYC405 PAE → ELP May 20, 19:05 UTCMay 20, 20:05 UTC1h 0m
2026-05-20 LYC405 PAE → ELP May 20, 15:25 UTCMay 20, 16:30 UTC1h 5m
2026-05-20 LYC405 PAE → ELP May 20, 12:50 UTCMay 20, 13:55 UTC1h 5m
2026-05-19 LYC405 PAE → ELP May 19, 23:05 UTCMay 20, 00:15 UTC1h 10m
2026-05-19 LYC405 PAE → ELP May 19, 15:05 UTCMay 19, 16:10 UTC1h 5m
2026-05-16 LYC405 PAE → ELP May 16, 22:30 UTCMay 16, 23:10 UTC40m
2026-05-16 LYC405 PAE → ELP May 16, 18:45 UTCMay 16, 19:20 UTC35m
2026-05-16 LYC405 PAE → ELP May 16, 15:01 UTCMay 16, 16:05 UTC1h 5m
2026-05-16 LYC405 PAE → ELP May 16, 12:16 UTCMay 16, 13:21 UTC1h 5m
2026-05-15 LYC405 PAE → ELP May 15, 18:50 UTCMay 15, 19:50 UTC1h 0m
2026-05-14 LYC405 PAE → ELP May 14, 14:35 UTCMay 14, 15:40 UTC1h 5m
2026-05-14 LYC405 PAE → ELP May 14, 01:15 UTCMay 14, 01:55 UTC40m
2026-05-13 LYC405 PAE → ELP May 13, 21:25 UTCMay 13, 22:00 UTC35m
2026-05-13 LYC405 PAE → ELP May 13, 18:05 UTCMay 13, 19:05 UTC1h 0m
2026-05-13 LYC405 PAE → ELP May 13, 14:15 UTCMay 13, 15:10 UTC55m
2026-05-13 LYC405 PAE → ELP May 13, 01:50 UTCMay 13, 03:05 UTC1h 15m
2026-05-12 LYC405 PAE → ELP May 12, 22:50 UTCMay 12, 23:25 UTC35m
2026-05-12 LYC405 PAE → ELP May 12, 17:20 UTCMay 12, 19:05 UTC1h 45m
2026-05-12 LYC405 PAE → ELP May 12, 14:15 UTCMay 12, 16:05 UTC1h 50m
2026-05-11 LYC405 PAE → ELP May 11, 14:25 UTCMay 11, 15:25 UTC1h 0m
2026-05-08 LYC405 PAE → ELP May 8, 23:45 UTCMay 9, 00:25 UTC40m
2026-05-08 LYC405 PAE → ELP May 8, 20:20 UTCMay 8, 20:55 UTC35m
2026-05-08 LYC405 PAE → ELP May 8, 14:45 UTCMay 8, 15:45 UTC1h 0m
2026-05-08 LYC405 PAE → ELP May 8, 12:00 UTCMay 8, 13:10 UTC1h 10m
2026-05-07 LYC405 PAE → ELP May 7, 18:15 UTCMay 8, 03:19 UTC9h 4m
2026-05-07 LYC405 PAE → ELP May 7, 14:05 UTCMay 7, 14:55 UTC50m
2026-05-03 LYC405 PAE → ELP May 3, 20:49 UTCMay 3, 22:30 UTC1h 40m
2026-05-03 LYC405 PAE → ELP May 3, 14:20 UTCMay 3, 15:50 UTC1h 30m
2026-05-02 LYC405 PAE → ELP May 2, 23:20 UTCMay 3, 00:25 UTC1h 5m
2026-05-02 LYC405 PAE → ELP May 2, 19:45 UTCMay 2, 21:05 UTC1h 20m
2026-05-02 LYC405 PAE → ELP May 2, 00:00 UTCMay 2, 00:40 UTC40m
2026-05-01 LYC405 PAE → ELP May 1, 20:45 UTCMay 1, 21:30 UTC45m
2026-05-01 LYC405 PAE → ELP May 1, 17:30 UTCMay 1, 18:45 UTC1h 15m
2026-05-01 LYC405 PAE → ELP May 1, 14:05 UTCMay 1, 15:05 UTC1h 0m
2026-05-01 LYC405 PAE → ELP May 1, 03:50 UTCMay 1, 04:55 UTC1h 5m
2026-05-01 LYC405 PAE → ELP May 1, 00:10 UTCMay 1, 01:15 UTC1h 5m
2026-04-30 LYC405 PAE → ELP Apr 30, 04:10 UTCApr 30, 05:25 UTC1h 15m
2026-04-30 LYC405 PAE → ELP Apr 30, 00:45 UTCApr 30, 01:45 UTC1h 0m
2026-04-29 LYC405 PAE → ELP Apr 29, 20:15 UTCApr 29, 22:15 UTC2h 0m
2026-04-29 LYC405 PAE → ELP Apr 29, 17:15 UTCApr 29, 17:35 UTC20m
2026-04-29 LYC405 PAE → ELP Apr 29, 14:15 UTCApr 29, 15:55 UTC1h 40m
2026-04-28 LYC405 PAE → ELP Apr 28, 23:00 UTCApr 28, 23:40 UTC40m
2026-04-28 LYC405 PAE → ELP Apr 28, 19:40 UTCApr 28, 20:20 UTC40m
2026-04-28 LYC405 PAE → ELP Apr 28, 15:50 UTCApr 28, 17:45 UTC1h 55m

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 N405LC page for operator, model, and routing details .

Mode-S A4C031 frequently asked

What is Mode-S code A4C031?
A4C031 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N405LC.
Where is Mode-S A4C031 registered?
Mode-S code A4C031 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 A4C031 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 A4C031, octal 51140061, decimal 10,797,105.
What flights does A4C031 operate?
Mode-S A4C031 has broadcast 2 distinct callsigns, including LYC405, LYC517.