Apparatus

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sensors Mode-S transponder

A0A54D

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N14019 · BOEING 787-10 Dreamliner · operated by UNITED AIRLINES INC

Hex
A0A54D
Octal
50122515
Decimal
10,528,077
Country
US
Tail
N14019
Type
B78X
No current signal · last broadcast 2h ago
Flights observed
243
Distinct callsigns
20
Country
US
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S A0A54D.

Country allocation

The ICAO 24-bit address A0A54D 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
UAL415 - 13 2026-07-06
UAL219 - 13 2026-06-30
UAL971 - 12 2026-06-21
UAL844 - 12 2026-07-11
UAL39 - 11 2026-06-11
UAL218 - 11 2026-07-01
UAL995 - 10 2026-07-13
UAL970 - 10 2026-06-20
UAL881 - 10 2026-07-11
UAL38 United Airlines 10 2026-06-10
UAL972 - 9 2026-07-12
UAL882 - 9 2026-07-12
UAL423 - 9 2026-06-26
UAL906 United Airlines 8 2026-06-13
UAL125 - 8 2026-07-14
UAL64 United Airlines 7 2026-06-04
UAL124 - 7 2026-07-13
UAL986 United Airlines 6 2026-05-18
UAL907 United Airlines 6 2026-06-13
UAL845 - 6 2026-07-10

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 UAL125 - Jul 14, 08:00 UTCJul 14, 12:10 UTC4h 10m
2026-07-13 UAL124 - Jul 13, 20:55 UTCJul 14, 05:40 UTC8h 45m
2026-07-13 UAL124 EWR → ATH Jul 13, 20:43 UTCJul 14, 05:33 UTC8h 50m
2026-07-13 UAL995 BRU → EWR Jul 13, 09:55 UTCJul 13, 17:15 UTC7h 20m
2026-07-12 UAL972 - Jul 12, 23:40 UTCJul 13, 01:15 UTC1h 35m
2026-07-12 UAL972 ORD → BRU Jul 12, 23:42 UTCJul 13, 07:01 UTC7h 19m
2026-07-12 UAL882 HND → ORD Jul 12, 08:40 UTCJul 12, 19:57 UTC11h 17m
2026-07-12 UAL882 - Jul 12, 08:45 UTCJul 12, 09:30 UTC45m
2026-07-11 UAL881 ORD → HND Jul 11, 17:46 UTCJul 12, 05:25 UTC11h 39m
2026-07-11 UAL881 - Jul 11, 17:25 UTCJul 11, 23:15 UTC5h 50m
2026-07-11 UAL844 - Jul 11, 01:40 UTCJul 11, 11:25 UTC9h 45m
2026-07-10 UAL845 - Jul 10, 03:55 UTCJul 10, 13:15 UTC9h 20m
2026-07-09 UAL945 FRA → ORD Jul 9, 07:30 UTCJul 9, 16:20 UTC8h 50m
2026-07-08 UAL944 - Jul 8, 20:55 UTCJul 9, 04:25 UTC7h 30m
2026-07-08 UAL944 ORD → FRA Jul 8, 20:47 UTCJul 9, 04:17 UTC7h 30m
2026-07-08 UAL945 - Jul 8, 07:10 UTCJul 8, 07:15 UTC5m
2026-07-08 UAL945 FRA → ORD Jul 8, 07:08 UTCJul 8, 15:40 UTC8h 32m
2026-07-07 UAL944 ORD → FRA Jul 7, 20:40 UTCJul 8, 04:15 UTC7h 35m
2026-07-06 UAL415 - Jul 6, 23:45 UTCJul 6, 23:55 UTC10m
2026-07-06 UAL415 MXP → ORD Jul 6, 15:12 UTCJul 6, 23:27 UTC8h 15m
2026-07-06 UAL415 MXP → ORD Jul 6, 15:12 UTCJul 6, 23:41 UTC8h 29m
2026-07-06 UAL415 - Jul 6, 15:05 UTCJul 6, 17:30 UTC2h 25m
2026-07-06 UAL416 ORD → MXP Jul 6, 04:25 UTCJul 6, 12:35 UTC8h 10m
2026-07-05 UAL770 BCN → ORD Jul 5, 15:50 UTCJul 6, 00:30 UTC8h 40m
2026-07-05 UAL769 - Jul 5, 05:35 UTCJul 5, 13:10 UTC7h 35m
2026-07-04 UAL3933 IAD → ORD Jul 4, 23:55 UTCJul 5, 01:55 UTC2h 0m
2026-07-04 UAL769 ORD → IAD Jul 4, 05:25 UTCJul 4, 07:35 UTC2h 10m
2026-07-04 UAL769 ORD → IAD Jul 4, 05:08 UTCJul 4, 13:15 UTC8h 7m
2026-07-02 UAL945 FRA → ORD Jul 2, 07:45 UTCJul 2, 16:20 UTC8h 35m
2026-07-01 UAL944 - Jul 1, 21:40 UTCJul 2, 04:50 UTC7h 10m
2026-07-01 UAL218 - Jul 1, 06:10 UTCJul 1, 09:40 UTC3h 30m
2026-07-01 UAL218 - Jul 1, 02:15 UTCJul 1, 02:30 UTC15m
2026-06-30 UAL219 ORD → HNL Jun 30, 15:09 UTCJun 30, 23:00 UTC7h 51m
2026-06-30 UAL219 - Jun 30, 14:50 UTCJun 30, 23:00 UTC8h 10m
2026-06-30 UAL218 - Jun 30, 06:45 UTCJun 30, 10:05 UTC3h 20m
2026-06-30 UAL218 - Jun 30, 02:50 UTCJun 30, 03:05 UTC15m
2026-06-29 UAL219 - Jun 29, 22:39 UTCJun 29, 22:59 UTC20m
2026-06-29 UAL219 ORD → HNL Jun 29, 15:09 UTCJun 29, 23:00 UTC7h 51m
2026-06-29 UAL219 - Jun 29, 14:50 UTCJun 29, 18:30 UTC3h 40m
2026-06-29 UAL844 - Jun 29, 01:44 UTCJun 29, 11:14 UTC9h 30m
2026-06-29 UAL844 GRU → ORD Jun 29, 01:42 UTCJun 29, 11:09 UTC9h 27m
2026-06-28 UAL845 ORD → GRU Jun 28, 03:00 UTCJun 28, 12:25 UTC9h 25m
2026-06-27 UAL770 BCN → ORD Jun 27, 13:35 UTCJun 27, 22:09 UTC8h 35m
2026-06-27 UAL769 ORD → BCN Jun 27, 03:04 UTCJun 27, 10:34 UTC7h 30m
2026-06-26 UAL423 ATH → ORD Jun 26, 10:40 UTCJun 26, 20:45 UTC10h 5m
2026-06-26 UAL423 ATH → ORD Jun 26, 10:50 UTCJun 26, 20:59 UTC10h 10m
2026-06-25 UAL422 ORD → ATH Jun 25, 22:49 UTCJun 26, 08:34 UTC9h 45m
2026-06-25 UAL844 GRU → ORD Jun 25, 01:42 UTCJun 25, 11:24 UTC9h 42m
2026-06-25 UAL844 - Jun 25, 01:50 UTCJun 25, 11:39 UTC9h 50m
2026-06-24 UAL845 ORD → GRU Jun 24, 03:00 UTCJun 24, 12:50 UTC9h 50m

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 N14019 page for operator, model, and routing details .

Mode-S A0A54D frequently asked

What is Mode-S code A0A54D?
A0A54D is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N14019.
Where is Mode-S A0A54D registered?
Mode-S code A0A54D 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 A0A54D broadcasting right now?
No active broadcast right now. Last signal was 2h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A0A54D, octal 50122515, decimal 10,528,077.
What flights does A0A54D operate?
Mode-S A0A54D has broadcast 20 distinct callsigns, including UAL415, UAL219, UAL971, UAL844, UAL39.