Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A46CE1

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N38424 · BOEING 737-900 · operated by UNITED AIRLINES INC

Hex
A46CE1
Octal
51066341
Decimal
10,775,777
Country
US
Tail
N38424
Type
B739
No current signal · last broadcast Jul 25, 05:20 UTC
Flights observed
428
Distinct callsigns
20
Country
US
Last broadcast
Jul 25, 05:20 UTC

Last known position

Most recent position reported by Mode-S A46CE1.

Country allocation

The ICAO 24-bit address A46CE1 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
UAL1575 - 6 2026-07-14
UAL1416 - 5 2026-07-11
UAL717 - 4 2026-07-13
UAL2857 United Airlines 4 2026-06-05
UAL2239 - 4 2026-07-15
UAL1213 United Airlines 4 2026-04-13
UAL8237 United Airlines 3 2026-04-18
UAL723 United Airlines 3 2026-04-28
UAL662 - 3 2026-07-14
UAL548 - 3 2026-07-13
UAL3754 United Airlines 3 2026-05-08
UAL2778 United Airlines 3 2026-07-24
UAL2773 United Airlines 3 2026-07-24
UAL2760 United Airlines 3 2026-06-08
UAL2672 United Airlines 3 2026-04-29
UAL2468 United Airlines 3 2026-04-22
UAL2389 United Airlines 3 2026-07-22
UAL2370 - 3 2026-07-08
UAL2322 - 3 2026-06-30
UAL2261 United Airlines 3 2026-07-19

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 UAL1976 BOS → IAH Jul 25, 04:00 UTCJul 25, 05:20 UTC1h 20m
2026-07-25 UAL1976 BOS → IAH Jul 25, 02:15 UTCJul 25, 03:25 UTC1h 10m
2026-07-24 UAL1516 LIR → IAH Jul 24, 19:36 UTCJul 24, 22:25 UTC2h 49m
2026-07-24 UAL1516 LIR → IAH Jul 24, 15:05 UTCJul 24, 22:30 UTC7h 25m
2026-07-24 UAL2773 HNL → ORD Jul 24, 11:15 UTCJul 24, 13:00 UTC1h 45m
2026-07-24 UAL2773 HNL → ORD Jul 24, 11:12 UTCJul 24, 13:09 UTC1h 57m
2026-07-24 UAL2778 HKG → SFO Jul 24, 00:25 UTCJul 24, 02:15 UTC1h 50m
2026-07-23 UAL1545 SFO → LAX Jul 23, 19:30 UTCJul 23, 22:00 UTC2h 30m
2026-07-23 UAL2067 IAH → LGA Jul 23, 15:35 UTCJul 23, 17:55 UTC2h 20m
2026-07-23 UAL715 ORD → PBI Jul 23, 11:35 UTCJul 23, 13:50 UTC2h 15m
2026-07-22 UAL2389 LGA → ORD Jul 22, 20:21 UTCJul 22, 20:48 UTC27m
2026-07-22 UAL2389 LGA → ORD Jul 22, 20:05 UTCJul 22, 20:50 UTC45m
2026-07-22 UAL1617 IAH → BOS Jul 22, 13:25 UTCJul 22, 15:40 UTC2h 15m
2026-07-22 UAL2419 MFR → SFO Jul 22, 03:00 UTCJul 22, 04:50 UTC1h 50m
2026-07-21 UAL624 PHX → DEN Jul 21, 23:40 UTCJul 22, 01:10 UTC1h 30m
2026-07-21 UAL624 PHX → DEN Jul 21, 23:37 UTCJul 22, 01:10 UTC1h 33m
2026-07-21 UAL455 ORD → MSN Jul 21, 18:50 UTCJul 21, 22:00 UTC3h 10m
2026-07-21 UAL2124 PDX → SFO Jul 21, 14:50 UTCJul 21, 17:10 UTC2h 20m
2026-07-21 UAL2310 ORD → IAH Jul 21, 10:40 UTCJul 21, 12:55 UTC2h 15m
2026-07-21 UAL1752 EWR → MCO Jul 21, 03:25 UTCJul 21, 05:40 UTC2h 15m
2026-07-20 UAL2741 IAD → EWR Jul 20, 23:00 UTCJul 21, 01:35 UTC2h 35m
2026-07-20 UAL2741 IAD → EWR Jul 20, 20:40 UTCJul 20, 21:20 UTC40m
2026-07-20 UAL2367 PIT → SFO Jul 20, 17:45 UTCJul 20, 18:34 UTC49m
2026-07-20 UAL2367 PIT → SFO Jul 20, 17:35 UTCJul 20, 18:35 UTC1h 0m
2026-07-20 UAL2356 BUR → SFO Jul 20, 15:10 UTCJul 20, 16:15 UTC1h 5m
2026-07-20 UAL1995 RSW → EWR Jul 20, 02:50 UTCJul 20, 04:05 UTC1h 15m
2026-07-19 UAL382 - Jul 19, 21:40 UTCJul 20, 01:05 UTC3h 25m
2026-07-19 UAL382 IAH → SFO Jul 19, 21:46 UTCJul 20, 00:56 UTC3h 10m
2026-07-19 UAL2162 ORD → PHL Jul 19, 17:25 UTCJul 19, 19:40 UTC2h 15m
2026-07-19 UAL2261 FLL → IAH Jul 19, 12:50 UTCJul 19, 15:25 UTC2h 35m
2026-07-17 UAL1493 - Jul 17, 16:15 UTCJul 17, 18:15 UTC2h 0m
2026-07-17 UAL2245 - Jul 17, 12:40 UTCJul 17, 14:15 UTC1h 35m
2026-07-17 UAL2245 IAH → MCO Jul 17, 12:39 UTCJul 17, 14:40 UTC2h 1m
2026-07-16 UAL2425 - Jul 16, 01:40 UTCJul 16, 04:30 UTC2h 50m
2026-07-15 UAL1800 - Jul 15, 20:15 UTCJul 15, 23:25 UTC3h 10m
2026-07-15 UAL677 - Jul 15, 16:00 UTCJul 15, 18:15 UTC2h 15m
2026-07-15 UAL1847 DFW → EWR Jul 15, 11:10 UTCJul 15, 14:10 UTC3h 0m
2026-07-15 UAL2239 DEN → DFW Jul 15, 03:10 UTCJul 15, 04:35 UTC1h 25m
2026-07-14 UAL566 SMF → DEN Jul 14, 23:25 UTCJul 15, 01:25 UTC2h 0m
2026-07-14 UAL662 DEN → SMF Jul 14, 20:00 UTCJul 14, 22:00 UTC2h 0m
2026-07-14 UAL502 BNA → DEN Jul 14, 16:10 UTCJul 14, 18:10 UTC2h 0m
2026-07-14 UAL1815 SFO → BNA Jul 14, 07:55 UTCJul 14, 11:55 UTC4h 0m
2026-07-14 UAL1575 PHL → SFO Jul 14, 01:15 UTCJul 14, 06:05 UTC4h 50m
2026-07-14 UAL1575 PHL → SFO Jul 14, 01:19 UTCJul 14, 06:00 UTC4h 41m
2026-07-13 UAL2431 - Jul 13, 16:00 UTCJul 13, 21:10 UTC5h 10m
2026-07-13 UAL2431 SFO → PHL Jul 13, 16:00 UTCJul 13, 21:06 UTC5h 6m
2026-07-13 UAL717 - Jul 13, 13:05 UTCJul 13, 14:05 UTC1h 0m
2026-07-13 UAL548 SFO → MFR Jul 13, 04:49 UTCJul 13, 05:28 UTC39m
2026-07-13 UAL548 SFO → MFR Jul 13, 04:40 UTCJul 13, 05:31 UTC50m
2026-07-12 UAL1341 - Jul 12, 23:35 UTCJul 13, 02:55 UTC3h 20m

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 N38424 page for operator, model, and routing details .

Mode-S A46CE1 frequently asked

What is Mode-S code A46CE1?
A46CE1 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N38424.
Where is Mode-S A46CE1 registered?
Mode-S code A46CE1 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 A46CE1 broadcasting right now?
No active broadcast right now. Last signal was Jul 25, 05:20 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A46CE1, octal 51066341, decimal 10,775,777.
What flights does A46CE1 operate?
Mode-S A46CE1 has broadcast 20 distinct callsigns, including UAL1575, UAL1416, UAL717, UAL2857, UAL2239.