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
Broadcasting now · callsign UAL1936 · 29,100 ft
Flights observed
399
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:05 UTC

Current position

A46C9A is currently broadcasting. Map zoomed to live position.

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 United Airlines 12 2026-07-24
UAL1752 United Airlines 10 2026-07-22
UAL1345 United Airlines 10 2026-07-22
UAL1148 United Airlines 10 2026-07-22
UAL1127 United Airlines 9 2026-07-19
UAL315 United Airlines 8 2026-07-06
UAL2863 - 8 2026-07-22
UAL2310 United Airlines 8 2026-07-24
UAL1936 United Airlines 8 2026-07-23
UAL1361 - 8 2026-07-16
UAL2456 United Airlines 7 2026-05-08
UAL2304 - 7 2026-07-19
UAL2215 - 7 2026-07-13
UAL1971 United Airlines 7 2026-07-26
UAL1950 United Airlines 7 2026-07-24
UAL1949 - 7 2026-07-15
UAL1563 United Airlines 7 2026-07-23
UAL1444 - 7 2026-07-06
UAL740 - 6 2026-06-20
UAL2491 - 6 2026-07-09

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL1971 EWR → SAT Jul 26, 19:35 UTCJul 26, 22:05 UTC2h 30m
2026-07-26 UAL2812 ORD → EWR Jul 26, 15:40 UTCJul 26, 18:00 UTC2h 20m
2026-07-26 UAL2078 BOS → ORD Jul 26, 01:40 UTCJul 26, 03:50 UTC2h 10m
2026-07-25 UAL2293 JAX → EWR Jul 25, 19:10 UTCJul 25, 22:55 UTC3h 45m
2026-07-25 UAL2654 BNA → SFO Jul 25, 13:10 UTCJul 25, 17:05 UTC3h 55m
2026-07-25 UAL1885 SLC → SFO Jul 25, 02:10 UTCJul 25, 04:25 UTC2h 15m
2026-07-24 UAL1507 HAV → IAH Jul 24, 22:05 UTCJul 25, 00:10 UTC2h 5m
2026-07-24 UAL2406 LAX → SFO Jul 24, 18:20 UTCJul 24, 20:05 UTC1h 45m
2026-07-24 UAL2310 MIA → EWR Jul 24, 14:45 UTCJul 24, 16:50 UTC2h 5m
2026-07-24 UAL678 LAS → SFO Jul 24, 12:15 UTCJul 24, 13:10 UTC55m
2026-07-24 UAL1950 KOA → SFO Jul 24, 02:15 UTCJul 24, 03:00 UTC45m
2026-07-23 UAL1872 DEN → AUS Jul 23, 22:15 UTCJul 23, 23:25 UTC1h 10m
2026-07-23 UAL1872 DEN → AUS Jul 23, 21:34 UTCJul 23, 23:20 UTC1h 46m
2026-07-23 UAL1872 DEN → AUS Jul 23, 21:20 UTCJul 23, 22:10 UTC50m
2026-07-23 UAL2662 DEN → PDX Jul 23, 17:50 UTCJul 23, 19:55 UTC2h 5m
2026-07-23 UAL2662 DEN → PDX Jul 23, 17:56 UTCJul 23, 19:49 UTC1h 53m
2026-07-23 UAL1936 SAV → EWR Jul 23, 13:10 UTCJul 23, 16:05 UTC2h 55m
2026-07-23 UAL1936 SAV → EWR Jul 23, 12:59 UTCJul 23, 16:00 UTC3h 1m
2026-07-23 UAL1563 LIH → SFO Jul 23, 02:05 UTCJul 23, 04:45 UTC2h 40m
2026-07-22 UAL1752 EWR → MCO Jul 22, 21:15 UTCJul 22, 23:35 UTC2h 20m
2026-07-22 UAL1345 MIA → EWR Jul 22, 17:50 UTCJul 22, 20:00 UTC2h 10m
2026-07-22 UAL2863 - Jul 22, 12:30 UTCJul 22, 15:45 UTC3h 15m
2026-07-22 UAL1148 DEN → BOS Jul 22, 02:20 UTCJul 22, 05:25 UTC3h 5m
2026-07-21 UAL1752 EWR → MCO Jul 21, 21:15 UTCJul 21, 23:30 UTC2h 15m
2026-07-21 UAL1345 MIA → EWR Jul 21, 17:35 UTCJul 21, 18:30 UTC55m
2026-07-21 UAL1345 MIA → EWR Jul 21, 17:46 UTCJul 21, 19:46 UTC2h 0m
2026-07-21 UAL1936 SAV → EWR Jul 21, 12:55 UTCJul 21, 15:40 UTC2h 45m
2026-07-21 UAL1936 SAV → EWR Jul 21, 12:59 UTCJul 21, 15:38 UTC2h 39m
2026-07-21 UAL1563 LIH → SFO Jul 21, 02:15 UTCJul 21, 04:50 UTC2h 35m
2026-07-21 UAL1563 LIH → SFO Jul 21, 02:10 UTCJul 21, 04:51 UTC2h 41m
2026-07-20 UAL2293 JAX → EWR Jul 20, 19:25 UTCJul 20, 23:20 UTC3h 55m
2026-07-20 UAL2654 BNA → SFO Jul 20, 13:15 UTCJul 20, 17:05 UTC3h 50m
2026-07-19 UAL2198 - Jul 19, 23:30 UTCJul 20, 01:40 UTC2h 10m
2026-07-19 UAL1238 EWR → MIA Jul 19, 19:45 UTCJul 19, 21:55 UTC2h 10m
2026-07-19 UAL2253 - Jul 19, 17:15 UTCJul 19, 18:00 UTC45m
2026-07-19 UAL575 BOS → ORD Jul 19, 15:15 UTCJul 19, 16:05 UTC50m
2026-07-19 UAL575 BOS → ORD Jul 19, 14:54 UTCJul 19, 16:03 UTC1h 9m
2026-07-19 UAL1127 ORD → SFO Jul 19, 12:25 UTCJul 19, 13:30 UTC1h 5m
2026-07-19 UAL1127 ORD → SFO Jul 19, 12:32 UTCJul 19, 13:32 UTC1h 0m
2026-07-19 UAL2304 - Jul 19, 02:30 UTCJul 19, 03:35 UTC1h 5m
2026-07-18 UAL2293 - Jul 18, 19:15 UTCJul 18, 23:05 UTC3h 50m
2026-07-18 UAL2654 BNA → SFO Jul 18, 13:30 UTCJul 18, 17:35 UTC4h 5m
2026-07-18 UAL2449 SJC → IAH Jul 18, 00:04 UTCJul 18, 02:40 UTC2h 35m
2026-07-17 UAL1971 EWR → SAT Jul 17, 19:40 UTCJul 17, 22:15 UTC2h 35m
2026-07-17 UAL2812 - Jul 17, 15:40 UTCJul 17, 17:55 UTC2h 15m
2026-07-17 UAL2078 - Jul 17, 01:15 UTCJul 17, 03:45 UTC2h 30m
2026-07-16 UAL2833 EWR → IAH Jul 16, 21:25 UTCJul 16, 23:25 UTC2h 0m
2026-07-16 UAL1361 - Jul 16, 17:54 UTCJul 16, 19:50 UTC1h 55m
2026-07-16 UAL2863 - Jul 16, 12:30 UTCJul 16, 15:45 UTC3h 15m
2026-07-16 UAL1148 - Jul 16, 01:50 UTCJul 16, 05:05 UTC3h 15m

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?
Yes. Mode-S A46C9A is currently airborne.
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, UAL1752, UAL1345, UAL1148, UAL1127.