Apparatus

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sensors Mode-S transponder

A4B155

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N401LC · LOCKHEED C-130 Hercules · operated by LYNDEN AIR CARGO LLC

Hex
A4B155
Octal
51130525
Decimal
10,793,301
Country
US
Tail
N401LC
Type
C130
No current signal · last broadcast Apr 25, 00:20 UTC
Flights observed
29
Distinct callsigns
1
Country
US
Last broadcast
Apr 25, 00:20 UTC

Last known position

Most recent position reported by Mode-S A4B155.

Country allocation

The ICAO 24-bit address A4B155 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
LYC401 Lynden Air Cargo 29 2026-04-25

Recent flights last 29

DateFlightRouteTakeoffLandingDuration
2026-04-25 LYC401 CHS → ELP Apr 25, 00:10 UTCApr 25, 00:20 UTC10m
2026-04-24 LYC401 CHS → ELP Apr 24, 22:00 UTCApr 24, 22:45 UTC45m
2026-04-24 LYC401 CHS → ELP Apr 24, 19:30 UTCApr 24, 20:30 UTC1h 0m
2026-04-20 LYC401 CHS → ELP Apr 20, 01:20 UTCApr 20, 02:25 UTC1h 5m
2026-04-19 LYC401 CHS → ELP Apr 19, 22:00 UTCApr 19, 23:05 UTC1h 5m
2026-04-17 LYC401 CHS → ELP Apr 17, 17:25 UTCApr 17, 18:45 UTC1h 20m
2026-04-17 LYC401 CHS → ELP Apr 17, 17:00 UTCApr 17, 17:15 UTC15m
2026-04-17 LYC401 CHS → ELP Apr 17, 15:20 UTCApr 17, 15:55 UTC35m
2026-04-17 LYC401 CHS → ELP Apr 17, 14:15 UTCApr 17, 15:15 UTC59m
2026-04-17 LYC401 CHS → ELP Apr 17, 07:20 UTCApr 17, 07:25 UTC5m
2026-04-17 LYC401 CHS → ELP Apr 17, 06:45 UTCApr 17, 07:15 UTC30m
2026-04-17 LYC401 CHS → ELP Apr 17, 03:20 UTCApr 17, 03:40 UTC20m
2026-04-17 LYC401 CHS → ELP Apr 17, 03:05 UTCApr 17, 03:15 UTC10m
2026-04-16 LYC401 CHS → ELP Apr 16, 23:20 UTCApr 17, 00:20 UTC1h 0m
2026-04-16 LYC401 CHS → ELP Apr 16, 22:40 UTCApr 16, 23:10 UTC30m
2026-04-16 LYC401 CHS → ELP Apr 16, 21:14 UTCApr 16, 21:45 UTC30m
2026-04-16 LYC401 CHS → ELP Apr 16, 20:05 UTCApr 16, 21:10 UTC1h 5m
2026-04-16 LYC401 CHS → ELP Apr 16, 17:15 UTCApr 16, 17:20 UTC5m
2026-04-16 LYC401 CHS → ELP Apr 16, 15:45 UTCApr 16, 17:10 UTC1h 25m
2026-04-16 LYC401 CHS → ELP Apr 16, 12:14 UTCApr 16, 12:55 UTC40m
2026-04-16 LYC401 CHS → ELP Apr 16, 04:10 UTCApr 16, 04:14 UTC5m
2026-04-16 LYC401 CHS → ELP Apr 16, 01:10 UTCApr 16, 01:15 UTC5m
2026-04-16 LYC401 CHS → ELP Apr 16, 00:45 UTCApr 16, 01:05 UTC20m
2026-04-15 LYC401 CHS → ELP Apr 15, 15:05 UTCApr 15, 15:55 UTC50m
2026-04-15 LYC401 CHS → ELP Apr 15, 14:50 UTCApr 15, 14:55 UTC5m
2026-04-14 LYC401 CHS → ELP Apr 14, 17:35 UTCApr 14, 18:25 UTC50m
2026-04-14 LYC401 CHS → ELP Apr 14, 14:50 UTCApr 14, 15:45 UTC55m
2026-04-14 LYC401 CHS → ELP Apr 14, 14:35 UTCApr 14, 14:45 UTC10m
2026-04-13 LYC401 CHS → ELP Apr 13, 21:15 UTCApr 13, 22:15 UTC1h 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 N401LC page for operator, model, and routing details .

Mode-S A4B155 frequently asked

What is Mode-S code A4B155?
A4B155 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N401LC.
Where is Mode-S A4B155 registered?
Mode-S code A4B155 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 A4B155 broadcasting right now?
No active broadcast right now. Last signal was Apr 25, 00:20 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A4B155, octal 51130525, decimal 10,793,301.
What flights does A4B155 operate?
Mode-S A4B155 has broadcast 1 distinct callsign, including LYC401.