Apparatus

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sensors Mode-S transponder

A3EF7E

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N35260 · BOEING 737-800 · operated by UNITED AIRLINES INC

Hex
A3EF7E
Octal
50767576
Decimal
10,743,678
Country
US
Tail
N35260
Type
B738
No current signal · last broadcast Jul 26, 21:05 UTC
Flights observed
105
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:05 UTC

Last known position

Most recent position reported by Mode-S A3EF7E.

Country allocation

The ICAO 24-bit address A3EF7E 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
UAL849 United Airlines 10 2026-05-08
UAL848 United Airlines 9 2026-05-08
UAL837 United Airlines 6 2026-04-24
UAL838 United Airlines 5 2026-04-25
UAL4196 - 3 2026-07-15
UAL33 United Airlines 3 2026-04-24
UAL196 United Airlines 3 2026-04-21
UAL193 United Airlines 3 2026-04-17
UAL3893 - 2 2026-07-16
UAL2401 United Airlines 2 2026-07-25
UAL2263 - 2 2026-07-16
UAL2108 United Airlines 2 2026-07-21
UAL2098 United Airlines 2 2026-07-20
UAL2048 United Airlines 2 2026-07-22
UAL2019 - 2 2026-07-18
UAL2004 United Airlines 2 2026-07-21
UAL1775 United Airlines 2 2026-07-23
UAL151 United Airlines 2 2026-05-09
UAL865 United Airlines 1 2026-04-20
UAL757 United Airlines 1 2026-07-19

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL2199 LGA → DEN Jul 26, 19:15 UTCJul 26, 21:05 UTC1h 50m
2026-07-26 UAL669 EWR → AUS Jul 26, 16:00 UTCJul 26, 17:55 UTC1h 55m
2026-07-26 UAL1332 DCA → ORD Jul 26, 11:45 UTCJul 26, 14:10 UTC2h 25m
2026-07-26 UAL1394 IAH → PIT Jul 26, 01:35 UTCJul 26, 03:45 UTC2h 10m
2026-07-25 UAL2422 NAS → ORD Jul 25, 20:30 UTCJul 25, 23:10 UTC2h 40m
2026-07-25 UAL2401 ORD → NAS Jul 25, 16:11 UTCJul 25, 18:58 UTC2h 47m
2026-07-25 UAL2401 ORD → NAS Jul 25, 16:15 UTCJul 25, 18:40 UTC2h 25m
2026-07-25 UAL1811 ORD → BDL Jul 25, 12:15 UTCJul 25, 13:55 UTC1h 40m
2026-07-24 UAL1776 LAX → SFO Jul 24, 23:25 UTCJul 25, 00:50 UTC1h 25m
2026-07-24 UAL2005 DFW → SFO Jul 24, 19:40 UTCJul 24, 21:40 UTC2h 0m
2026-07-24 UAL2672 DEN → MSN Jul 24, 16:45 UTCJul 24, 18:30 UTC1h 45m
2026-07-24 UAL2771 HNL → ORD Jul 24, 12:40 UTCJul 24, 14:15 UTC1h 35m
2026-07-23 UAL1748 IAH → JAX Jul 23, 23:50 UTCJul 24, 01:15 UTC1h 25m
2026-07-23 UAL1504 ORD → DCA Jul 23, 19:55 UTCJul 23, 22:15 UTC2h 20m
2026-07-23 UAL1775 SFO → PHX Jul 23, 16:30 UTCJul 23, 18:10 UTC1h 40m
2026-07-23 UAL1775 SFO → PHX Jul 23, 16:29 UTCJul 23, 18:06 UTC1h 37m
2026-07-23 UAL1491 PHL → ORD Jul 23, 13:15 UTCJul 23, 14:15 UTC1h 0m
2026-07-23 UAL1851 PDX → IAH Jul 23, 02:05 UTCJul 23, 03:10 UTC1h 5m
2026-07-22 UAL2048 ORD → MSY Jul 22, 21:05 UTCJul 23, 00:12 UTC3h 7m
2026-07-22 UAL2048 ORD → MSY Jul 22, 21:10 UTCJul 23, 00:40 UTC3h 30m
2026-07-22 UAL245 BZN → EWR Jul 22, 15:05 UTCJul 22, 19:10 UTC4h 5m
2026-07-22 UAL2281 CVG → IAH Jul 22, 12:10 UTCJul 22, 13:15 UTC1h 5m
2026-07-22 UAL2236 SFO → BOS Jul 22, 01:30 UTCJul 22, 02:25 UTC55m
2026-07-21 UAL1326 SFO → BNA Jul 21, 23:15 UTCJul 21, 23:50 UTC35m
2026-07-21 UAL2270 LAS → IAH Jul 21, 20:00 UTCJul 21, 21:40 UTC1h 40m
2026-07-21 UAL2004 ORD → SFO Jul 21, 17:05 UTCJul 21, 18:10 UTC1h 5m
2026-07-21 UAL2004 ORD → SFO Jul 21, 17:01 UTCJul 21, 18:08 UTC1h 7m
2026-07-21 UAL497 CVG → DEN Jul 21, 14:05 UTCJul 21, 15:05 UTC1h 0m
2026-07-21 UAL1464 EWR → FLL Jul 21, 10:50 UTCJul 21, 12:30 UTC1h 40m
2026-07-21 UAL395 EWR → SFO Jul 21, 03:00 UTCJul 21, 04:50 UTC1h 50m
2026-07-21 UAL2108 EWR → CHS Jul 21, 00:05 UTCJul 21, 01:35 UTC1h 30m
2026-07-20 UAL2108 EWR → CHS Jul 20, 23:46 UTCJul 21, 01:31 UTC1h 45m
2026-07-20 UAL2156 IAD → LAS Jul 20, 17:25 UTCJul 20, 21:45 UTC4h 20m
2026-07-20 UAL2098 BOS → IAD Jul 20, 13:40 UTCJul 20, 14:55 UTC1h 15m
2026-07-20 UAL2098 BOS → IAD Jul 20, 13:40 UTCJul 20, 14:54 UTC1h 14m
2026-07-19 UAL2798 DEN → BOS Jul 19, 22:30 UTCJul 20, 02:00 UTC3h 30m
2026-07-19 UAL757 CLE → LAS Jul 19, 18:30 UTCJul 19, 20:30 UTC2h 0m
2026-07-19 UAL2271 LAX → SEA Jul 19, 14:25 UTCJul 19, 16:45 UTC2h 20m
2026-07-19 UAL2436 DEN → MSY Jul 19, 02:10 UTCJul 19, 04:10 UTC2h 0m
2026-07-18 UAL2019 - Jul 18, 23:55 UTCJul 19, 00:50 UTC55m
2026-07-18 UAL2019 LAX → SFO Jul 18, 23:30 UTCJul 19, 00:41 UTC1h 11m
2026-07-18 UAL1879 ORD → SJD Jul 18, 14:35 UTCJul 18, 21:45 UTC7h 10m
2026-07-17 UAL1057 LGA → ORD Jul 17, 14:00 UTCJul 17, 16:00 UTC2h 0m
2026-07-16 UAL2857 - Jul 16, 22:40 UTCJul 17, 01:39 UTC3h 0m
2026-07-16 UAL2263 - Jul 16, 18:59 UTCJul 16, 20:15 UTC1h 15m
2026-07-16 UAL2263 PVR → IAH Jul 16, 18:32 UTCJul 16, 20:10 UTC1h 38m
2026-07-16 UAL1622 IAH → PVR Jul 16, 14:55 UTCJul 16, 16:53 UTC1h 58m
2026-07-16 UAL3893 - Jul 16, 05:20 UTCJul 16, 07:20 UTC2h 0m
2026-07-16 UAL3893 MIA → IAH Jul 16, 04:42 UTCJul 16, 07:33 UTC2h 51m
2026-07-15 UAL4196 - Jul 15, 21:00 UTCJul 15, 21:50 UTC50m

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 N35260 page for operator, model, and routing details .

Mode-S A3EF7E frequently asked

What is Mode-S code A3EF7E?
A3EF7E is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N35260.
Where is Mode-S A3EF7E registered?
Mode-S code A3EF7E 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 A3EF7E broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:05 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A3EF7E, octal 50767576, decimal 10,743,678.
What flights does A3EF7E operate?
Mode-S A3EF7E has broadcast 20 distinct callsigns, including UAL849, UAL848, UAL837, UAL838, UAL4196.