Apparatus

Try JFK, AAL1290, BAW, or N225AN.

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 Jul 26, 20:00 UTC
Flights observed
277
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 20:00 UTC

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
UAL219 United Airlines 14 2026-07-17
UAL415 - 13 2026-07-06
UAL39 United Airlines 13 2026-07-26
UAL971 - 12 2026-06-21
UAL844 - 12 2026-07-11
UAL218 United Airlines 12 2026-07-18
UAL995 United Airlines 11 2026-07-20
UAL972 United Airlines 11 2026-07-19
UAL64 United Airlines 11 2026-07-23
UAL38 United Airlines 11 2026-07-25
UAL970 - 10 2026-06-20
UAL881 - 10 2026-07-11
UAL882 - 9 2026-07-12
UAL65 United Airlines 9 2026-07-23
UAL423 - 9 2026-06-26
UAL973 - 8 2026-07-19
UAL944 - 8 2026-07-16
UAL906 United Airlines 8 2026-06-13
UAL125 - 8 2026-07-14
UAL945 - 7 2026-07-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL39 LAX → HND Jul 26, 19:00 UTCJul 26, 20:00 UTC1h 0m
2026-07-25 UAL38 HND → LAX Jul 25, 09:45 UTCJul 25, 19:30 UTC9h 45m
2026-07-24 UAL39 LAX → HND Jul 24, 19:55 UTCJul 25, 06:05 UTC10h 10m
2026-07-23 UAL2238 IAH → SFO Jul 23, 21:45 UTCJul 24, 02:42 UTC4h 57m
2026-07-23 UAL2238 IAH → SFO Jul 23, 21:55 UTCJul 24, 02:50 UTC4h 55m
2026-07-23 UAL65 LIS → EWR Jul 23, 10:44 UTCJul 23, 17:22 UTC6h 38m
2026-07-23 UAL65 LIS → EWR Jul 23, 10:40 UTCJul 23, 17:15 UTC6h 35m
2026-07-23 UAL64 EWR → LIS Jul 23, 02:01 UTCJul 23, 08:31 UTC6h 30m
2026-07-23 UAL64 EWR → LIS Jul 23, 02:20 UTCJul 23, 03:15 UTC55m
2026-07-22 UAL1981 DEN → LGA Jul 22, 18:50 UTCJul 22, 23:10 UTC4h 20m
2026-07-22 UAL1981 DEN → LGA Jul 22, 18:47 UTCJul 22, 23:09 UTC4h 22m
2026-07-22 UAL2445 GSP → ORD Jul 22, 11:40 UTCJul 22, 16:30 UTC4h 50m
2026-07-22 UAL2397 EWR → PDX Jul 22, 10:20 UTCJul 22, 11:20 UTC1h 0m
2026-07-21 UAL2238 IAH → SFO Jul 21, 22:40 UTCJul 22, 03:45 UTC5h 5m
2026-07-21 UAL65 LIS → EWR Jul 21, 10:25 UTCJul 21, 16:55 UTC6h 30m
2026-07-21 UAL64 EWR → LIS Jul 21, 00:56 UTCJul 21, 06:46 UTC5h 50m
2026-07-21 UAL64 EWR → LIS Jul 21, 00:50 UTCJul 21, 02:35 UTC1h 45m
2026-07-20 UAL995 BRU → EWR Jul 20, 09:55 UTCJul 20, 17:25 UTC7h 30m
2026-07-19 UAL972 ORD → BRU Jul 19, 23:50 UTCJul 20, 07:10 UTC7h 20m
2026-07-19 UAL973 - Jul 19, 09:10 UTCJul 19, 17:05 UTC7h 55m
2026-07-18 UAL972 ORD → BRU Jul 18, 23:40 UTCJul 19, 07:00 UTC7h 20m
2026-07-18 UAL218 HNL → ORD Jul 18, 05:55 UTCJul 18, 13:30 UTC7h 35m
2026-07-17 UAL219 ORD → HNL Jul 17, 19:55 UTCJul 18, 03:55 UTC8h 1m
2026-07-17 UAL945 - Jul 17, 07:20 UTCJul 17, 15:35 UTC8h 15m
2026-07-16 UAL944 ORD → FRA Jul 16, 20:47 UTCJul 17, 04:17 UTC7h 30m
2026-07-16 UAL944 - Jul 16, 20:29 UTCJul 17, 03:14 UTC6h 45m
2026-07-16 UAL945 - Jul 16, 07:45 UTCJul 16, 09:25 UTC1h 40m
2026-07-16 UAL945 FRA → ORD Jul 16, 07:38 UTCJul 16, 15:57 UTC8h 19m
2026-07-15 UAL944 - Jul 15, 20:35 UTCJul 16, 04:15 UTC7h 40m
2026-07-15 UAL944 ORD → FRA Jul 15, 20:47 UTCJul 16, 04:10 UTC7h 23m
2026-07-15 UAL973 BRU → ORD Jul 15, 08:50 UTCJul 15, 16:45 UTC7h 55m
2026-07-15 UAL973 BRU → ORD Jul 15, 08:46 UTCJul 15, 16:31 UTC7h 45m
2026-07-14 UAL994 EWR → BRU Jul 14, 23:55 UTCJul 15, 06:35 UTC6h 40m
2026-07-14 UAL994 EWR → BRU Jul 14, 23:49 UTCJul 15, 06:33 UTC6h 44m
2026-07-14 UAL125 ATH → EWR Jul 14, 08:00 UTCJul 14, 17:40 UTC9h 40m
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

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 Jul 26, 20:00 UTC.
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 UAL219, UAL415, UAL39, UAL971, UAL844.