Apparatus

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sensors Mode-S transponder

A46C9A

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N38403 · BOEING 737-900 · operated by UNITED AIRLINES INC

Hex
A46C9A
Octal
51066232
Decimal
10,775,706
Country
US
Tail
N38403
Type
B739
No current signal · last broadcast 5h ago
Flights observed
344
Distinct callsigns
20
Country
US
Last broadcast
5h ago

Last known position

Most recent position reported by Mode-S A46C9A.

Country allocation

The ICAO 24-bit address A46C9A 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 20 distinct

Callsign Airline Flights Last seen
UAL2406 - 11 2026-06-29
UAL315 United Airlines 8 2026-07-06
UAL1752 - 8 2026-07-13
UAL1148 - 8 2026-07-14
UAL2456 United Airlines 7 2026-05-08
UAL2310 - 7 2026-06-29
UAL2215 - 7 2026-07-13
UAL1444 - 7 2026-07-06
UAL1361 - 7 2026-07-03
UAL1345 - 7 2026-07-13
UAL1127 - 7 2026-07-11
UAL740 - 6 2026-06-20
UAL2491 - 6 2026-07-09
UAL2304 - 6 2026-07-11
UAL2124 - 6 2026-07-10
UAL1950 - 6 2026-06-21
UAL1949 - 6 2026-06-27
UAL496 - 5 2026-07-12
UAL2863 - 5 2026-06-15
UAL2245 - 5 2026-07-12

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 UAL1148 - Jul 14, 02:40 UTCJul 14, 05:55 UTC3h 15m
2026-07-13 UAL1752 - Jul 13, 22:50 UTCJul 14, 00:55 UTC2h 5m
2026-07-13 UAL1345 - Jul 13, 18:45 UTCJul 13, 21:10 UTC2h 25m
2026-07-13 UAL2105 - Jul 13, 15:10 UTCJul 13, 16:10 UTC1h 0m
2026-07-13 UAL491 - Jul 13, 13:00 UTCJul 13, 14:00 UTC1h 0m
2026-07-13 UAL2215 - Jul 13, 00:15 UTCJul 13, 02:15 UTC2h 0m
2026-07-12 UAL496 - Jul 12, 20:20 UTCJul 12, 22:35 UTC2h 15m
2026-07-12 UAL1493 - Jul 12, 16:10 UTCJul 12, 18:25 UTC2h 15m
2026-07-12 UAL2245 - Jul 12, 12:45 UTCJul 12, 14:45 UTC2h 0m
2026-07-12 UAL2245 IAH → MCO Jul 12, 12:49 UTCJul 12, 14:41 UTC1h 52m
2026-07-11 UAL2474 - Jul 11, 23:45 UTCJul 12, 01:50 UTC2h 5m
2026-07-11 UAL462 - Jul 11, 20:15 UTCJul 11, 22:20 UTC2h 5m
2026-07-11 UAL462 IAH → FLL Jul 11, 20:00 UTCJul 11, 22:19 UTC2h 19m
2026-07-11 UAL2253 - Jul 11, 17:10 UTCJul 11, 18:00 UTC50m
2026-07-11 UAL575 - Jul 11, 15:15 UTCJul 11, 16:05 UTC50m
2026-07-11 UAL1127 OKC → IAH Jul 11, 12:27 UTCJul 11, 13:29 UTC1h 2m
2026-07-11 UAL1127 - Jul 11, 12:30 UTCJul 11, 13:30 UTC1h 0m
2026-07-11 UAL2304 - Jul 11, 01:35 UTCJul 11, 02:30 UTC55m
2026-07-10 UAL2236 - Jul 10, 20:55 UTCJul 11, 00:00 UTC3h 5m
2026-07-10 UAL2606 - Jul 10, 16:10 UTCJul 10, 18:50 UTC2h 40m
2026-07-10 UAL2606 IAH → YYZ Jul 10, 16:24 UTCJul 10, 18:47 UTC2h 23m
2026-07-10 UAL2124 - Jul 10, 14:00 UTCJul 10, 14:50 UTC50m
2026-07-10 UAL1696 - Jul 10, 02:05 UTCJul 10, 02:50 UTC45m
2026-07-09 UAL2237 - Jul 9, 21:55 UTCJul 10, 00:45 UTC2h 50m
2026-07-09 UAL2491 - Jul 9, 19:35 UTCJul 9, 19:55 UTC20m
2026-07-09 UAL2491 - Jul 9, 15:05 UTCJul 9, 18:10 UTC3h 5m
2026-07-09 UAL2124 - Jul 9, 12:30 UTCJul 9, 13:25 UTC55m
2026-07-09 UAL1696 - Jul 9, 01:40 UTCJul 9, 02:25 UTC45m
2026-07-08 UAL2293 - Jul 8, 19:30 UTCJul 8, 23:10 UTC3h 40m
2026-07-08 UAL2654 - Jul 8, 13:30 UTCJul 8, 17:35 UTC4h 5m
2026-07-07 UAL1872 - Jul 7, 23:55 UTCJul 8, 02:05 UTC2h 10m
2026-07-07 UAL2662 DEN → PDX Jul 7, 17:50 UTCJul 7, 19:50 UTC2h 0m
2026-07-07 UAL1936 SAV → EWR Jul 7, 12:55 UTCJul 7, 15:50 UTC2h 55m
2026-07-07 UAL1563 - Jul 7, 02:05 UTCJul 7, 05:00 UTC2h 55m
2026-07-07 UAL1563 IAH → ONT Jul 7, 02:05 UTCJul 7, 04:59 UTC2h 54m
2026-07-06 UAL1444 - Jul 6, 21:25 UTCJul 6, 23:55 UTC2h 30m
2026-07-06 UAL315 FLL → IAD Jul 6, 17:25 UTCJul 6, 19:35 UTC2h 10m
2026-07-06 UAL1318 - Jul 6, 13:30 UTCJul 6, 15:40 UTC2h 10m
2026-07-06 UAL2432 SFO → LAS Jul 6, 03:30 UTCJul 6, 05:50 UTC2h 20m
2026-07-06 UAL2432 SFO → LAS Jul 6, 03:36 UTCJul 6, 05:44 UTC2h 8m
2026-07-05 UAL2215 - Jul 5, 23:45 UTCJul 6, 01:40 UTC1h 55m
2026-07-05 UAL496 - Jul 5, 19:45 UTCJul 5, 21:50 UTC2h 5m
2026-07-05 UAL1493 - Jul 5, 16:10 UTCJul 5, 18:05 UTC1h 55m
2026-07-05 UAL2245 - Jul 5, 12:35 UTCJul 5, 14:30 UTC1h 55m
2026-07-04 UAL2323 - Jul 4, 23:00 UTCJul 4, 23:30 UTC30m
2026-07-04 UAL1819 - Jul 4, 20:25 UTCJul 4, 21:05 UTC40m
2026-07-04 UAL1819 IAH → SAT Jul 4, 20:30 UTCJul 4, 21:01 UTC31m
2026-07-04 UAL2812 - Jul 4, 16:35 UTCJul 4, 18:40 UTC2h 5m
2026-07-04 UAL2078 BOS → ORD Jul 4, 03:25 UTCJul 4, 03:55 UTC30m
2026-07-04 UAL2078 BOS → ORD Jul 4, 01:50 UTCJul 4, 02:30 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 N38403 page for operator, model, and routing details .

Mode-S A46C9A frequently asked

What is Mode-S code A46C9A?
A46C9A is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N38403.
Where is Mode-S A46C9A registered?
Mode-S code A46C9A 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 A46C9A broadcasting right now?
No active broadcast right now. Last signal was 5h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A46C9A, octal 51066232, decimal 10,775,706.
What flights does A46C9A operate?
Mode-S A46C9A has broadcast 20 distinct callsigns, including UAL2406, UAL315, UAL1752, UAL1148, UAL2456.