Apparatus

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sensors Mode-S transponder

A6E258

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N54241 · BOEING 737-800 · operated by UNITED AIRLINES INC

Hex
A6E258
Octal
51561130
Decimal
10,936,920
Country
US
Tail
N54241
Type
B738
Broadcasting now · callsign UAL1565 · 35,000 ft
Flights observed
360
Distinct callsigns
20
Country
US
Last broadcast
14m ago

Current position

A6E258 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A6E258 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
UAL275 United Airlines 5 2026-05-28
UAL1336 United Airlines 5 2026-04-21
UAL2037 - 4 2026-04-13
UAL1892 United Airlines 4 2026-05-11
UAL1303 - 4 2026-07-12
UAL687 United Airlines 3 2026-05-15
UAL640 United Airlines 3 2026-04-17
UAL378 United Airlines 3 2026-05-25
UAL2653 - 3 2026-06-21
UAL2389 - 3 2026-04-13
UAL2342 - 3 2026-06-19
UAL2270 United Airlines 3 2026-04-16
UAL2123 United Airlines 3 2026-04-20
UAL1967 United Airlines 3 2026-05-08
UAL1911 United Airlines 3 2026-05-28
UAL1910 United Airlines 3 2026-04-17
UAL1712 - 3 2026-06-16
UAL1710 - 3 2026-07-01
UAL1390 United Airlines 3 2026-05-15
UAL1316 - 3 2026-06-30

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 UAL1565 - Jul 14, 03:20 UTCJul 14, 04:00 UTC40m
2026-07-13 UAL2152 - Jul 13, 21:45 UTCJul 13, 23:15 UTC1h 30m
2026-07-13 UAL294 - Jul 13, 16:15 UTCJul 13, 17:15 UTC1h 0m
2026-07-13 UAL294 DEN → SJD Jul 13, 16:20 UTCJul 13, 18:50 UTC2h 30m
2026-07-13 UAL2865 SBA → DEN Jul 13, 12:20 UTCJul 13, 14:20 UTC2h 0m
2026-07-13 UAL2479 DEN → SBA Jul 13, 01:40 UTCJul 13, 03:45 UTC2h 5m
2026-07-12 UAL2012 - Jul 12, 20:30 UTCJul 12, 23:40 UTC3h 10m
2026-07-12 UAL1362 - Jul 12, 16:10 UTCJul 12, 19:15 UTC3h 5m
2026-07-12 UAL1362 DEN → BWI Jul 12, 16:07 UTCJul 12, 19:10 UTC3h 3m
2026-07-12 UAL1241 EUG → DEN Jul 12, 12:10 UTCJul 12, 14:20 UTC2h 10m
2026-07-12 UAL1303 DEN → EUG Jul 12, 02:01 UTCJul 12, 04:10 UTC2h 10m
2026-07-12 UAL1303 DEN → EUG Jul 12, 01:55 UTCJul 12, 04:17 UTC2h 22m
2026-07-11 UAL1303 DFW → DEN Jul 11, 22:15 UTCJul 11, 23:50 UTC1h 35m
2026-07-11 UAL2290 ORD → DFW Jul 11, 18:35 UTCJul 11, 20:25 UTC1h 50m
2026-07-11 UAL1310 LGA → ORD Jul 11, 14:50 UTCJul 11, 16:55 UTC2h 5m
2026-07-11 UAL2857 - Jul 11, 00:15 UTCJul 11, 03:05 UTC2h 50m
2026-07-10 UAL2263 PVR → IAH Jul 10, 18:32 UTCJul 10, 20:22 UTC1h 50m
2026-07-10 UAL1622 - Jul 10, 15:25 UTCJul 10, 20:25 UTC5h 0m
2026-07-10 UAL2281 - Jul 10, 13:05 UTCJul 10, 14:10 UTC1h 5m
2026-07-10 UAL2236 - Jul 10, 01:35 UTCJul 10, 02:35 UTC1h 0m
2026-07-09 UAL1570 - Jul 9, 18:00 UTCJul 9, 23:10 UTC5h 10m
2026-07-09 UAL2760 - Jul 9, 13:40 UTCJul 9, 16:25 UTC2h 45m
2026-07-09 UAL8141 - Jul 9, 04:40 UTCJul 9, 05:45 UTC1h 5m
2026-07-09 UAL2216 YVR → SFO Jul 9, 00:43 UTCJul 9, 02:34 UTC1h 51m
2026-07-09 UAL2216 YVR → SFO Jul 9, 00:45 UTCJul 9, 02:35 UTC1h 50m
2026-07-08 UAL1151 - Jul 8, 21:15 UTCJul 8, 23:00 UTC1h 45m
2026-07-08 UAL2480 - Jul 8, 17:10 UTCJul 8, 19:05 UTC1h 55m
2026-07-08 UAL1973 - Jul 8, 04:00 UTCJul 8, 05:45 UTC1h 45m
2026-07-07 UAL1174 - Jul 7, 23:30 UTCJul 8, 00:55 UTC1h 25m
2026-07-07 UAL1881 - Jul 7, 18:15 UTCJul 7, 20:05 UTC1h 50m
2026-07-07 UAL1881 SFO → SJD Jul 7, 18:16 UTCJul 7, 20:49 UTC2h 33m
2026-07-07 UAL2153 DEN → SNA Jul 7, 11:15 UTCJul 7, 15:45 UTC4h 30m
2026-07-06 UAL717 - Jul 6, 17:55 UTCJul 6, 22:05 UTC4h 10m
2026-07-06 UAL565 YYZ → SFO Jul 6, 10:40 UTCJul 6, 15:30 UTC4h 50m
2026-07-06 UAL1649 - Jul 6, 03:35 UTCJul 6, 04:35 UTC1h 0m
2026-07-05 UAL2101 - Jul 5, 21:15 UTCJul 6, 00:35 UTC3h 20m
2026-07-05 UAL2205 - Jul 5, 15:35 UTCJul 5, 19:45 UTC4h 10m
2026-07-05 UAL532 - Jul 5, 11:20 UTCJul 5, 12:55 UTC1h 35m
2026-07-05 UAL2050 - Jul 5, 00:05 UTCJul 5, 01:35 UTC1h 30m
2026-07-04 UAL1601 - Jul 4, 20:35 UTCJul 4, 22:30 UTC1h 55m
2026-07-04 UAL1600 - Jul 4, 17:05 UTCJul 4, 18:50 UTC1h 45m
2026-07-04 UAL2228 - Jul 4, 14:00 UTCJul 4, 15:40 UTC1h 40m
2026-07-04 UAL2228 MCI → IAH Jul 4, 13:45 UTCJul 4, 15:39 UTC1h 54m
2026-07-04 UAL1596 - Jul 4, 03:10 UTCJul 4, 04:30 UTC1h 20m
2026-07-04 UAL1596 DEN → MCI Jul 4, 03:05 UTCJul 4, 04:31 UTC1h 26m
2026-07-03 UAL1236 YVR → DEN Jul 3, 23:00 UTCJul 4, 01:15 UTC2h 15m
2026-07-03 UAL1767 DEN → YVR Jul 3, 18:15 UTCJul 3, 20:50 UTC2h 35m
2026-07-03 UAL1891 MSP → DEN Jul 3, 14:30 UTCJul 3, 16:10 UTC1h 40m
2026-07-03 UAL667 DEN → MSP Jul 3, 03:45 UTCJul 3, 05:15 UTC1h 30m
2026-07-02 UAL1787 PDX → DEN Jul 2, 23:20 UTCJul 3, 02:05 UTC2h 45m

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 N54241 page for operator, model, and routing details .

Mode-S A6E258 frequently asked

What is Mode-S code A6E258?
A6E258 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N54241.
Where is Mode-S A6E258 registered?
Mode-S code A6E258 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 A6E258 broadcasting right now?
Yes. Mode-S A6E258 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A6E258, octal 51561130, decimal 10,936,920.
What flights does A6E258 operate?
Mode-S A6E258 has broadcast 20 distinct callsigns, including UAL275, UAL1336, UAL2037, UAL1892, UAL1303.