Apparatus

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sensors Mode-S transponder

A0A545

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N14011 · BOEING 787-10 Dreamliner · operated by UNITED AIRLINES INC

Hex
A0A545
Octal
50122505
Decimal
10,528,069
Country
US
Tail
N14011
Type
B78X
No current signal · last broadcast Jul 26, 18:45 UTC
Flights observed
256
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 18:45 UTC

Last known position

Most recent position reported by Mode-S A0A545.

Country allocation

The ICAO 24-bit address A0A545 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
UAL219 United Airlines 25 2026-07-26
UAL218 United Airlines 23 2026-07-23
UAL944 - 16 2026-07-12
UAL945 - 13 2026-07-13
UAL973 - 12 2026-07-20
UAL881 - 11 2026-07-16
UAL844 United Airlines 11 2026-07-26
UAL971 - 10 2026-06-30
UAL994 - 9 2026-07-20
UAL970 - 9 2026-06-29
UAL882 - 8 2026-07-17
UAL416 - 8 2026-06-15
UAL995 United Airlines 7 2026-07-18
UAL972 United Airlines 7 2026-07-18
UAL38 - 7 2026-07-06
UAL987 - 6 2026-07-01
UAL845 United Airlines 6 2026-07-25
UAL415 - 6 2026-06-15
UAL986 - 5 2026-07-01
UAL125 - 5 2026-07-19

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL219 ORD → HNL Jul 26, 15:10 UTCJul 26, 18:45 UTC3h 35m
2026-07-26 UAL844 GRU → ORD Jul 26, 02:00 UTCJul 26, 11:45 UTC9h 46m
2026-07-26 UAL844 GRU → ORD Jul 26, 02:02 UTCJul 26, 11:33 UTC9h 31m
2026-07-25 UAL845 ORD → GRU Jul 25, 03:10 UTCJul 25, 12:30 UTC9h 20m
2026-07-23 UAL218 HNL → ORD Jul 23, 06:30 UTCJul 23, 10:05 UTC3h 35m
2026-07-22 UAL219 ORD → HNL Jul 22, 15:25 UTCJul 22, 23:50 UTC8h 25m
2026-07-22 UAL844 GRU → ORD Jul 22, 11:10 UTCJul 22, 11:20 UTC10m
2026-07-22 UAL844 GRU → ORD Jul 22, 01:35 UTCJul 22, 10:25 UTC8h 50m
2026-07-21 UAL845 - Jul 21, 05:05 UTCJul 21, 14:30 UTC9h 25m
2026-07-20 UAL973 BRU → ORD Jul 20, 11:31 UTCJul 20, 19:08 UTC7h 37m
2026-07-20 UAL973 BRU → ORD Jul 20, 11:31 UTCJul 20, 19:25 UTC7h 54m
2026-07-20 UAL973 - Jul 20, 11:30 UTCJul 20, 13:00 UTC1h 30m
2026-07-20 UAL994 - Jul 20, 01:45 UTCJul 20, 03:15 UTC1h 30m
2026-07-20 UAL994 EWR → BRU Jul 20, 01:26 UTCJul 20, 08:31 UTC7h 5m
2026-07-19 UAL125 ATH → EWR Jul 19, 11:45 UTCJul 19, 21:35 UTC9h 50m
2026-07-18 UAL124 EWR → ATH Jul 18, 23:50 UTCJul 19, 08:25 UTC8h 35m
2026-07-18 UAL995 BRU → EWR Jul 18, 11:20 UTCJul 18, 18:30 UTC7h 10m
2026-07-18 UAL972 ORD → BRU Jul 18, 00:25 UTCJul 18, 07:35 UTC7h 11m
2026-07-17 UAL882 - Jul 17, 08:54 UTCJul 17, 17:15 UTC8h 20m
2026-07-17 UAL882 HND → ORD Jul 17, 08:40 UTCJul 17, 20:51 UTC12h 11m
2026-07-16 UAL881 - Jul 16, 17:40 UTCJul 17, 05:30 UTC11h 50m
2026-07-16 UAL881 ORD → HND Jul 16, 17:46 UTCJul 17, 05:27 UTC11h 41m
2026-07-15 UAL906 - Jul 15, 15:55 UTCJul 15, 23:15 UTC7h 20m
2026-07-15 UAL906 - Jul 15, 15:05 UTCJul 15, 15:50 UTC45m
2026-07-15 UAL907 ORD → FRA Jul 15, 00:45 UTCJul 15, 12:35 UTC11h 50m
2026-07-14 UAL423 ATH → ORD Jul 14, 10:10 UTCJul 14, 20:50 UTC10h 40m
2026-07-13 UAL422 ORD → ATH Jul 13, 21:45 UTCJul 14, 07:25 UTC9h 40m
2026-07-13 UAL945 FRA → ORD Jul 13, 07:10 UTCJul 13, 15:25 UTC8h 15m
2026-07-12 UAL944 - Jul 12, 20:35 UTCJul 13, 03:15 UTC6h 40m
2026-07-12 UAL944 ORD → FRA Jul 12, 20:47 UTCJul 13, 04:16 UTC7h 29m
2026-07-12 UAL945 - Jul 12, 13:25 UTCJul 12, 15:30 UTC2h 5m
2026-07-12 UAL945 - Jul 12, 07:15 UTCJul 12, 13:15 UTC6h 0m
2026-07-11 UAL944 ORD → FRA Jul 11, 20:25 UTCJul 12, 04:10 UTC7h 45m
2026-07-11 UAL973 - Jul 11, 09:30 UTCJul 11, 16:50 UTC7h 20m
2026-07-11 UAL973 - Jul 11, 09:00 UTCJul 11, 09:25 UTC25m
2026-07-10 UAL994 - Jul 10, 23:25 UTCJul 11, 05:45 UTC6h 20m
2026-07-09 UAL1981 - Jul 9, 20:20 UTCJul 10, 01:00 UTC4h 40m
2026-07-09 UAL2445 - Jul 9, 11:15 UTCJul 9, 16:00 UTC4h 45m
2026-07-09 UAL2397 - Jul 9, 04:20 UTCJul 9, 09:00 UTC4h 40m
2026-07-08 UAL2238 - Jul 8, 20:25 UTCJul 9, 01:05 UTC4h 40m
2026-07-07 UAL1855 - Jul 7, 20:35 UTCJul 8, 01:25 UTC4h 50m
2026-07-07 UAL2692 - Jul 7, 14:10 UTCJul 7, 18:50 UTC4h 40m
2026-07-07 UAL2303 - Jul 7, 06:55 UTCJul 7, 11:35 UTC4h 40m
2026-07-06 UAL38 - Jul 6, 09:50 UTCJul 6, 19:10 UTC9h 20m
2026-07-05 UAL881 - Jul 5, 19:45 UTCJul 6, 07:15 UTC11h 30m
2026-07-05 UAL881 ORD → HND Jul 5, 19:46 UTCJul 6, 07:30 UTC11h 44m
2026-07-05 UAL945 FRA → ORD Jul 5, 07:25 UTCJul 5, 15:50 UTC8h 25m
2026-07-05 UAL945 FRA → ORD Jul 5, 07:13 UTCJul 5, 15:36 UTC8h 23m
2026-07-04 UAL944 ORD → FRA Jul 4, 20:57 UTCJul 5, 04:28 UTC7h 31m
2026-07-04 UAL944 - Jul 4, 21:00 UTCJul 4, 23:00 UTC2h 0m

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 N14011 page for operator, model, and routing details .

Mode-S A0A545 frequently asked

What is Mode-S code A0A545?
A0A545 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N14011.
Where is Mode-S A0A545 registered?
Mode-S code A0A545 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 A0A545 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 18:45 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A0A545, octal 50122505, decimal 10,528,069.
What flights does A0A545 operate?
Mode-S A0A545 has broadcast 20 distinct callsigns, including UAL219, UAL218, UAL944, UAL945, UAL973.