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sensors Mode-S transponder

A7A04C

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N5904A · PILATUS PC-12 · operated by LABORATORY CORPORATION OF AMERICA HOLDINGS

Hex
A7A04C
Octal
51720114
Decimal
10,985,548
Country
US
Tail
N5904A
Type
PC12
No current signal · last broadcast Jul 25, 06:55 UTC
Flights observed
256
Distinct callsigns
18
Country
US
Last broadcast
Jul 25, 06:55 UTC

Last known position

Most recent position reported by Mode-S A7A04C.

Country allocation

The ICAO 24-bit address A7A04C 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 18 distinct

Callsign Airline Flights Last seen
SKQ91 - 99 2026-07-17
SKQ37 - 44 2026-06-13
SKQ31 - 33 2026-06-11
SKQ48 - 12 2026-07-23
SKQ74 - 11 2026-07-23
SKQ78 - 10 2026-07-24
SKQ65 - 9 2026-06-13
SKQ45 - 8 2026-07-24
SKQ61 - 7 2026-07-21
SKQ53 - 4 2026-05-10
SKQ25 - 4 2026-06-18
SKQ85 - 3 2026-05-11
SKQ34 - 3 2026-07-22
SKQ77 - 2 2026-05-10
SKQ55 - 2 2026-05-19
SKQ303 - 2 2026-07-17
SKQ22 - 2 2026-07-25
SKQ69 - 1 2026-05-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 SKQ22 - Jul 25, 05:30 UTCJul 25, 06:55 UTC1h 25m
2026-07-25 SKQ22 - Jul 25, 00:05 UTCJul 25, 04:45 UTC4h 40m
2026-07-24 SKQ78 - Jul 24, 10:05 UTCJul 24, 11:55 UTC1h 50m
2026-07-24 SKQ45 - Jul 24, 05:20 UTCJul 24, 08:05 UTC2h 45m
2026-07-24 SKQ45 - Jul 24, 02:00 UTCJul 24, 04:15 UTC2h 15m
2026-07-24 SKQ45 - Jul 24, 00:35 UTCJul 24, 01:20 UTC45m
2026-07-23 SKQ78 - Jul 23, 12:40 UTCJul 23, 13:55 UTC1h 15m
2026-07-23 SKQ78 - Jul 23, 11:25 UTCJul 23, 12:00 UTC35m
2026-07-23 SKQ78 - Jul 23, 10:00 UTCJul 23, 10:50 UTC50m
2026-07-23 SKQ74 - Jul 23, 07:35 UTCJul 23, 08:30 UTC55m
2026-07-23 SKQ74 - Jul 23, 05:55 UTCJul 23, 06:45 UTC50m
2026-07-23 SKQ48 - Jul 23, 04:00 UTCJul 23, 04:55 UTC55m
2026-07-23 SKQ48 ABE → MNZ Jul 23, 02:05 UTCJul 23, 02:50 UTC45m
2026-07-23 SKQ48 - Jul 23, 00:00 UTCJul 23, 01:20 UTC1h 20m
2026-07-22 SKQ34 SAV → USA Jul 22, 03:50 UTCJul 22, 05:00 UTC1h 10m
2026-07-22 SKQ34 - Jul 22, 00:40 UTCJul 22, 02:40 UTC2h 0m
2026-07-21 SKQ61 - Jul 21, 22:55 UTCJul 22, 00:10 UTC1h 15m
2026-07-21 SKQ61 - Jul 21, 21:30 UTCJul 21, 22:10 UTC40m
2026-07-17 SKQ303 - Jul 17, 11:39 UTCJul 17, 14:00 UTC2h 20m
2026-07-17 SKQ91 OPF → TPA Jul 17, 06:54 UTCJul 17, 07:50 UTC55m
2026-07-17 SKQ91 - Jul 17, 05:20 UTCJul 17, 06:10 UTC50m
2026-07-17 SKQ91 - Jul 17, 03:59 UTCJul 17, 04:54 UTC55m
2026-07-17 SKQ91 - Jul 17, 02:15 UTCJul 17, 03:05 UTC50m
2026-07-16 SKQ91 TPA → TPA Jul 16, 23:29 UTCJul 17, 01:45 UTC2h 15m
2026-07-16 SKQ91 - Jul 16, 07:20 UTCJul 16, 08:10 UTC50m
2026-07-16 SKQ91 - Jul 16, 05:35 UTCJul 16, 06:20 UTC45m
2026-07-16 SKQ91 - Jul 16, 04:05 UTCJul 16, 04:55 UTC50m
2026-07-16 SKQ91 - Jul 16, 02:15 UTCJul 16, 03:05 UTC50m
2026-07-15 SKQ91 TPA → TPA Jul 15, 23:35 UTCJul 16, 01:45 UTC2h 10m
2026-07-15 SKQ91 - Jul 15, 07:45 UTCJul 15, 08:30 UTC45m
2026-07-15 SKQ91 - Jul 15, 05:20 UTCJul 15, 06:10 UTC50m
2026-07-15 SKQ91 - Jul 15, 03:55 UTCJul 15, 04:45 UTC50m
2026-07-15 SKQ91 - Jul 15, 02:10 UTCJul 15, 02:55 UTC45m
2026-07-15 SKQ91 OPF → TPA Jul 15, 00:45 UTCJul 15, 01:35 UTC50m
2026-07-14 SKQ91 - Jul 14, 22:20 UTCJul 14, 23:10 UTC49m
2026-07-14 SKQ91 - Jul 14, 08:25 UTCJul 14, 09:15 UTC50m
2026-07-14 SKQ91 - Jul 14, 05:40 UTCJul 14, 06:30 UTC50m
2026-07-14 SKQ91 - Jul 14, 04:25 UTCJul 14, 05:10 UTC45m
2026-07-14 SKQ91 - Jul 14, 02:40 UTCJul 14, 03:40 UTC1h 0m
2026-07-14 SKQ91 - Jul 14, 01:05 UTCJul 14, 02:10 UTC1h 5m
2026-07-13 SKQ91 - Jul 13, 22:15 UTCJul 13, 23:10 UTC55m
2026-07-11 SKQ91 - Jul 11, 10:10 UTCJul 11, 11:00 UTC50m
2026-07-11 SKQ91 - Jul 11, 08:50 UTCJul 11, 09:35 UTC45m
2026-07-11 SKQ91 - Jul 11, 07:35 UTCJul 11, 08:20 UTC45m
2026-07-11 SKQ91 - Jul 11, 03:05 UTCJul 11, 03:55 UTC50m
2026-07-10 SKQ91 - Jul 10, 07:45 UTCJul 10, 08:30 UTC45m
2026-07-10 SKQ91 - Jul 10, 05:25 UTCJul 10, 06:10 UTC45m
2026-07-10 SKQ91 OPF → TPA Jul 10, 04:00 UTCJul 10, 04:50 UTC50m
2026-07-10 SKQ91 - Jul 10, 02:20 UTCJul 10, 03:10 UTC50m
2026-07-10 SKQ91 - Jul 10, 01:00 UTCJul 10, 01:45 UTC45m

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 N5904A page for operator, model, and routing details .

Mode-S A7A04C frequently asked

What is Mode-S code A7A04C?
A7A04C is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N5904A.
Where is Mode-S A7A04C registered?
Mode-S code A7A04C 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 A7A04C broadcasting right now?
No active broadcast right now. Last signal was Jul 25, 06:55 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A7A04C, octal 51720114, decimal 10,985,548.
What flights does A7A04C operate?
Mode-S A7A04C has broadcast 18 distinct callsigns, including SKQ91, SKQ37, SKQ31, SKQ48, SKQ74.