Apparatus

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sensors Mode-S transponder

A0B840

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N14540 · operated by WILMINGTON TRUST CO TRUSTEE

Hex
A0B840
Octal
50134100
Decimal
10,532,928
Country
US
Tail
N14540
Type
A21N
No current signal · last broadcast Jul 26, 22:00 UTC
Flights observed
474
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:00 UTC

Last known position

Most recent position reported by Mode-S A0B840.

Country allocation

The ICAO 24-bit address A0B840 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
UAL660 - 8 2026-07-17
UAL647 United Airlines 8 2026-07-18
UAL2865 - 8 2026-06-24
UAL2835 - 8 2026-07-07
UAL360 - 7 2026-06-18
UAL597 - 6 2026-07-13
UAL1779 - 6 2026-07-02
UAL2607 United Airlines 5 2026-04-21
UAL2179 - 5 2026-07-16
UAL2106 - 5 2026-06-26
UAL2088 - 5 2026-07-04
UAL1610 United Airlines 5 2026-05-23
UAL1565 United Airlines 5 2026-07-17
UAL1525 United Airlines 5 2026-04-30
UAL1377 - 5 2026-07-13
UAL800 United Airlines 4 2026-07-25
UAL534 United Airlines 4 2026-05-05
UAL489 - 4 2026-07-12
UAL374 - 4 2026-06-21
UAL321 United Airlines 4 2026-04-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL1363 SJC → DEN Jul 26, 18:40 UTCJul 26, 22:00 UTC3h 20m
2026-07-26 UAL609 EWR → RDU Jul 26, 15:10 UTCJul 26, 16:10 UTC1h 0m
2026-07-26 UAL1488 IAD → BTV Jul 26, 13:20 UTCJul 26, 14:05 UTC45m
2026-07-26 UAL729 SFO → ORD Jul 26, 07:25 UTCJul 26, 11:10 UTC3h 45m
2026-07-26 UAL531K ORD → DSM Jul 26, 03:40 UTCJul 26, 05:35 UTC1h 55m
2026-07-25 UAL800 EWR → MCO Jul 25, 21:05 UTCJul 26, 01:00 UTC3h 55m
2026-07-25 UAL1232 EWR → ORD Jul 25, 16:00 UTCJul 25, 19:25 UTC3h 25m
2026-07-25 UAL1217 IAH → BOS Jul 25, 12:10 UTCJul 25, 14:15 UTC2h 5m
2026-07-25 UAL2649 ORD → LAX Jul 25, 03:25 UTCJul 25, 05:20 UTC1h 55m
2026-07-24 UAL2834 GUM → SFO Jul 24, 21:20 UTCJul 25, 00:50 UTC3h 30m
2026-07-24 UAL2446 FLL → EWR Jul 24, 16:25 UTCJul 24, 19:25 UTC3h 0m
2026-07-24 UAL459 ORD → LAS Jul 24, 12:10 UTCJul 24, 14:15 UTC2h 5m
2026-07-24 UAL459 ORD → LAS Jul 24, 12:11 UTCJul 24, 14:13 UTC2h 2m
2026-07-24 UAL498 PDX → EWR Jul 24, 02:20 UTCJul 24, 04:35 UTC2h 15m
2026-07-23 UAL2845 MCO → DEN Jul 23, 19:50 UTCJul 23, 23:10 UTC3h 20m
2026-07-23 UAL2845 MCO → DEN Jul 23, 19:55 UTCJul 23, 23:18 UTC3h 23m
2026-07-23 UAL2292 EWR → DEN Jul 23, 14:35 UTCJul 23, 17:45 UTC3h 10m
2026-07-23 UAL3757 LAS → SFO Jul 23, 04:10 UTCJul 23, 06:40 UTC2h 30m
2026-07-23 UAL3757 LAS → SFO Jul 23, 03:23 UTCJul 23, 06:26 UTC3h 3m
2026-07-23 UAL3779 PIT → DEN Jul 23, 00:55 UTCJul 23, 02:50 UTC1h 55m
2026-07-22 UAL1701 PHX → EWR Jul 22, 15:50 UTCJul 22, 19:30 UTC3h 40m
2026-07-22 UAL2613 DEN → EWR Jul 22, 11:10 UTCJul 22, 13:55 UTC2h 45m
2026-07-22 UAL2613 DEN → EWR Jul 22, 10:38 UTCJul 22, 13:56 UTC3h 18m
2026-07-21 UAL1999 SFO → DEN Jul 21, 22:50 UTCJul 22, 02:35 UTC3h 45m
2026-07-21 UAL563 SNA → SFO Jul 21, 12:55 UTCJul 21, 14:50 UTC1h 55m
2026-07-21 UAL368 EWR → FLL Jul 21, 07:25 UTCJul 21, 11:15 UTC3h 50m
2026-07-21 UAL1389 CMH → DEN Jul 21, 03:30 UTCJul 21, 05:40 UTC2h 10m
2026-07-20 UAL800 EWR → MCO Jul 20, 21:15 UTCJul 21, 01:25 UTC4h 10m
2026-07-20 UAL1232 EWR → ORD Jul 20, 15:50 UTCJul 20, 19:25 UTC3h 35m
2026-07-20 UAL1889 SMF → DEN Jul 20, 12:15 UTCJul 20, 14:15 UTC2h 0m
2026-07-20 UAL2132 MSP → EWR Jul 20, 02:10 UTCJul 20, 04:10 UTC2h 0m
2026-07-19 UAL1354 SAT → IAD Jul 19, 20:10 UTCJul 19, 23:30 UTC3h 20m
2026-07-19 UAL1102 ORD → RSW Jul 19, 16:00 UTCJul 19, 18:25 UTC2h 25m
2026-07-19 UAL2616 ATL → EWR Jul 19, 11:20 UTCJul 19, 13:25 UTC2h 5m
2026-07-19 UAL475 EWR → MCO Jul 19, 01:55 UTCJul 19, 03:45 UTC1h 50m
2026-07-18 UAL484 - Jul 18, 21:40 UTCJul 18, 23:35 UTC1h 55m
2026-07-18 UAL1599 DEN → IAH Jul 18, 17:56 UTCJul 18, 19:42 UTC1h 46m
2026-07-18 UAL1599 - Jul 18, 17:50 UTCJul 18, 19:45 UTC1h 55m
2026-07-18 UAL647 BOS → DEN Jul 18, 12:00 UTCJul 18, 15:55 UTC3h 55m
2026-07-18 UAL1356 SJC → DEN Jul 18, 00:15 UTCJul 18, 03:40 UTC3h 26m
2026-07-17 UAL1565 SFO → PHX Jul 17, 19:49 UTCJul 17, 21:50 UTC2h 0m
2026-07-17 UAL660 ORD → SAN Jul 17, 14:35 UTCJul 17, 18:00 UTC3h 25m
2026-07-17 UAL660 ORD → SAN Jul 17, 14:16 UTCJul 17, 17:53 UTC3h 37m
2026-07-17 UAL1850 - Jul 17, 08:10 UTCJul 17, 12:00 UTC3h 50m
2026-07-17 UAL2123 DEN → SFO Jul 17, 04:29 UTCJul 17, 06:35 UTC2h 5m
2026-07-16 UAL800 EWR → MCO Jul 16, 21:12 UTCJul 17, 01:15 UTC4h 3m
2026-07-16 UAL800 EWR → MCO Jul 16, 21:19 UTCJul 17, 01:20 UTC4h 0m
2026-07-16 UAL1232 DEN → BOS Jul 16, 16:05 UTCJul 16, 19:35 UTC3h 30m
2026-07-16 UAL1479 - Jul 16, 12:09 UTCJul 16, 14:10 UTC2h 0m
2026-07-16 UAL2179 ORD → SFO Jul 16, 00:10 UTCJul 16, 04:15 UTC4h 5m

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 N14540 page for operator, model, and routing details .

Mode-S A0B840 frequently asked

What is Mode-S code A0B840?
A0B840 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N14540.
Where is Mode-S A0B840 registered?
Mode-S code A0B840 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 A0B840 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:00 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A0B840, octal 50134100, decimal 10,532,928.
What flights does A0B840 operate?
Mode-S A0B840 has broadcast 20 distinct callsigns, including UAL660, UAL647, UAL2865, UAL2835, UAL360.