Apparatus

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sensors Mode-S transponder

A0F428

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N16009 · BOEING 787-10 Dreamliner · operated by UNITED AIRLINES INC

Hex
A0F428
Octal
50172050
Decimal
10,548,264
Country
US
Tail
N16009
Type
B78X
No current signal · last broadcast Jul 26, 18:00 UTC
Flights observed
185
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 18:00 UTC

Last known position

Most recent position reported by Mode-S A0F428.

Country allocation

The ICAO 24-bit address A0F428 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
UAL945 - 14 2026-06-25
UAL986 United Airlines 12 2026-07-26
UAL944 - 12 2026-06-24
UAL995 - 10 2026-07-06
UAL994 - 9 2026-07-08
UAL987 United Airlines 9 2026-07-26
UAL973 - 8 2026-07-09
UAL972 - 7 2026-07-06
UAL65 - 7 2026-07-08
UAL64 - 7 2026-07-08
UAL881 United Airlines 6 2026-07-18
UAL39 United Airlines 6 2026-07-22
UAL38 - 6 2026-07-21
UAL2238 - 6 2026-07-06
UAL125 - 6 2026-06-20
UAL124 - 6 2026-06-19
UAL906 United Airlines 5 2026-07-25
UAL2397 United Airlines 5 2026-07-20
UAL882 United Airlines 4 2026-07-23
UAL845 - 4 2026-07-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL986 CDG → ORD Jul 26, 09:50 UTCJul 26, 17:55 UTC8h 5m
2026-07-26 UAL987 ORD → CDG Jul 26, 00:17 UTCJul 26, 07:37 UTC7h 20m
2026-07-26 UAL987 ORD → CDG Jul 26, 00:20 UTCJul 26, 07:40 UTC7h 21m
2026-07-25 UAL906 FRA → ORD Jul 25, 20:05 UTCJul 25, 20:10 UTC5m
2026-07-25 UAL906 FRA → ORD Jul 25, 11:30 UTCJul 25, 20:10 UTC8h 40m
2026-07-25 UAL906 FRA → ORD Jul 25, 11:09 UTCJul 25, 19:49 UTC8h 40m
2026-07-25 UAL907 ORD → FRA Jul 25, 01:20 UTCJul 25, 09:00 UTC7h 40m
2026-07-24 UAL906 FRA → ORD Jul 24, 11:20 UTCJul 24, 19:50 UTC8h 30m
2026-07-24 UAL907 ORD → FRA Jul 24, 00:35 UTCJul 24, 07:50 UTC7h 15m
2026-07-23 UAL882 HND → ORD Jul 23, 08:50 UTCJul 23, 19:50 UTC11h 0m
2026-07-22 UAL39 LAX → HND Jul 22, 18:55 UTCJul 22, 20:05 UTC1h 10m
2026-07-22 UAL39 LAX → HND Jul 22, 19:02 UTCJul 23, 05:41 UTC10h 39m
2026-07-21 UAL38 HND → LAX Jul 21, 09:45 UTCJul 21, 19:40 UTC9h 55m
2026-07-20 UAL39 LAX → HND Jul 20, 19:02 UTCJul 21, 05:32 UTC10h 30m
2026-07-20 UAL39 LAX → HND Jul 20, 18:50 UTCJul 21, 05:20 UTC10h 29m
2026-07-20 UAL2445 GSP → ORD Jul 20, 11:40 UTCJul 20, 16:15 UTC4h 35m
2026-07-20 UAL2397 EWR → PDX Jul 20, 04:20 UTCJul 20, 09:00 UTC4h 40m
2026-07-19 UAL38 HND → LAX Jul 19, 09:35 UTCJul 19, 19:15 UTC9h 40m
2026-07-19 UAL38 - Jul 19, 09:40 UTCJul 19, 19:15 UTC9h 35m
2026-07-18 UAL881 ORD → HND Jul 18, 17:35 UTCJul 19, 05:40 UTC12h 5m
2026-07-18 UAL881 ORD → HND Jul 18, 17:46 UTCJul 19, 05:40 UTC11h 54m
2026-07-17 UAL844 GRU → ORD Jul 17, 01:35 UTCJul 17, 11:10 UTC9h 35m
2026-07-16 UAL845 - Jul 16, 03:20 UTCJul 16, 12:34 UTC9h 15m
2026-07-15 UAL423 ATH → ORD Jul 15, 10:00 UTCJul 15, 20:25 UTC10h 25m
2026-07-14 UAL422 ORD → ATH Jul 14, 22:05 UTCJul 15, 07:40 UTC9h 34m
2026-07-14 UAL422 ORD → ATH Jul 14, 22:03 UTCJul 15, 07:31 UTC9h 28m
2026-07-14 UAL986 - Jul 14, 17:40 UTCJul 14, 17:50 UTC10m
2026-07-14 UAL986 - Jul 14, 09:40 UTCJul 14, 17:50 UTC8h 10m
2026-07-14 UAL986 CDG → ORD Jul 14, 09:39 UTCJul 14, 17:25 UTC7h 46m
2026-07-13 UAL987 - Jul 13, 23:45 UTCJul 14, 07:15 UTC7h 30m
2026-07-13 UAL986 - Jul 13, 10:00 UTCJul 13, 18:00 UTC8h 0m
2026-07-13 UAL987 ORD → CDG Jul 13, 00:10 UTCJul 13, 07:45 UTC7h 35m
2026-07-12 UAL906 FRA → ORD Jul 12, 12:05 UTCJul 12, 20:20 UTC8h 15m
2026-07-12 UAL907 - Jul 12, 00:10 UTCJul 12, 07:50 UTC7h 40m
2026-07-11 UAL986 - Jul 11, 10:20 UTCJul 11, 18:10 UTC7h 50m
2026-07-11 UAL987 - Jul 11, 00:50 UTCJul 11, 08:01 UTC7h 10m
2026-07-10 UAL986 - Jul 10, 10:20 UTCJul 10, 18:25 UTC8h 5m
2026-07-10 UAL987 - Jul 10, 00:45 UTCJul 10, 07:55 UTC7h 10m
2026-07-09 UAL973 BRU → ORD Jul 9, 08:40 UTCJul 9, 16:40 UTC8h 0m
2026-07-08 UAL994 EWR → BRU Jul 8, 23:04 UTCJul 9, 05:24 UTC6h 20m
2026-07-08 UAL65 LIS → EWR Jul 8, 10:55 UTCJul 8, 17:35 UTC6h 40m
2026-07-08 UAL64 EWR → LIS Jul 8, 01:20 UTCJul 8, 07:10 UTC5h 50m
2026-07-07 UAL1981 DEN → LGA Jul 7, 18:30 UTCJul 7, 23:00 UTC4h 30m
2026-07-06 UAL2238 - Jul 6, 21:35 UTCJul 7, 02:25 UTC4h 50m
2026-07-06 UAL995 - Jul 6, 09:50 UTCJul 6, 11:25 UTC1h 35m
2026-07-06 UAL995 BRU → EWR Jul 6, 09:44 UTCJul 6, 17:15 UTC7h 31m
2026-07-06 UAL995 BRU → EWR Jul 6, 09:44 UTCJul 6, 17:15 UTC7h 31m
2026-07-06 UAL972 - Jul 6, 00:05 UTCJul 6, 07:15 UTC7h 10m
2026-07-05 UAL986 - Jul 5, 20:30 UTCJul 5, 20:35 UTC5m
2026-07-05 UAL986 - Jul 5, 12:20 UTCJul 5, 20:35 UTC8h 15m

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 N16009 page for operator, model, and routing details .

Mode-S A0F428 frequently asked

What is Mode-S code A0F428?
A0F428 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N16009.
Where is Mode-S A0F428 registered?
Mode-S code A0F428 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 A0F428 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 18:00 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A0F428, octal 50172050, decimal 10,548,264.
What flights does A0F428 operate?
Mode-S A0F428 has broadcast 20 distinct callsigns, including UAL945, UAL986, UAL944, UAL995, UAL994.