Apparatus

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sensors Mode-S transponder

A0F427

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N16008 · BOEING 787-10 Dreamliner · operated by UNITED AIRLINES INC

Hex
A0F427
Octal
50172047
Decimal
10,548,263
Country
US
Tail
N16008
Type
B78X
Broadcasting now · callsign UAL945 · 35,975 ft
Flights observed
264
Distinct callsigns
20
Country
US
Last broadcast
Jul 25, 17:35 UTC

Current position

A0F427 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A0F427 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
UAL882 - 14 2026-07-08
UAL945 - 13 2026-07-14
UAL986 United Airlines 12 2026-07-25
UAL973 - 12 2026-07-16
UAL944 - 12 2026-07-13
UAL844 - 10 2026-07-07
UAL65 United Airlines 10 2026-05-23
UAL64 United Airlines 9 2026-05-23
UAL987 United Airlines 8 2026-07-24
UAL971 United Airlines 8 2026-07-20
UAL906 United Airlines 8 2026-07-23
UAL845 United Airlines 8 2026-07-06
UAL422 United Airlines 8 2026-07-20
UAL39 - 8 2026-06-27
UAL994 - 7 2026-07-16
UAL907 United Airlines 7 2026-07-23
UAL881 - 7 2026-07-14
UAL125 - 7 2026-06-30
UAL124 - 7 2026-06-29
UAL970 United Airlines 6 2026-07-19

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 UAL986 CDG → ORD Jul 25, 09:30 UTCJul 25, 10:55 UTC1h 25m
2026-07-25 UAL986 CDG → ORD Jul 25, 09:39 UTCJul 25, 17:24 UTC7h 45m
2026-07-25 UAL986 CDG → ORD Jul 25, 09:39 UTCJul 25, 17:15 UTC7h 36m
2026-07-24 UAL987 ORD → CDG Jul 24, 23:45 UTCJul 25, 07:00 UTC7h 15m
2026-07-24 UAL986 CDG → ORD Jul 24, 09:40 UTCJul 24, 17:45 UTC8h 5m
2026-07-24 UAL986 CDG → ORD Jul 24, 09:52 UTCJul 24, 17:28 UTC7h 36m
2026-07-24 UAL987 ORD → CDG Jul 24, 00:25 UTCJul 24, 07:30 UTC7h 5m
2026-07-23 UAL906 FRA → ORD Jul 23, 12:00 UTCJul 23, 20:40 UTC8h 40m
2026-07-23 UAL907 ORD → FRA Jul 23, 00:10 UTCJul 23, 07:45 UTC7h 35m
2026-07-22 UAL906 FRA → ORD Jul 22, 11:25 UTCJul 22, 19:50 UTC8h 25m
2026-07-22 UAL907 - Jul 22, 00:35 UTCJul 22, 01:40 UTC1h 5m
2026-07-21 UAL423 YYZ → DEN Jul 21, 09:55 UTCJul 21, 20:31 UTC10h 36m
2026-07-21 UAL423 YYZ → DEN Jul 21, 09:55 UTCJul 21, 20:50 UTC10h 55m
2026-07-20 UAL422 DEN → BOS Jul 20, 21:55 UTCJul 21, 07:30 UTC9h 35m
2026-07-20 UAL971 FCO → ORD Jul 20, 08:20 UTCJul 20, 17:35 UTC9h 15m
2026-07-19 UAL970 ORD → FCO Jul 19, 21:05 UTCJul 20, 05:40 UTC8h 35m
2026-07-18 UAL986 - Jul 18, 11:50 UTCJul 18, 13:30 UTC1h 40m
2026-07-18 UAL986 CDG → ORD Jul 18, 12:05 UTCJul 18, 19:39 UTC7h 34m
2026-07-18 UAL987 ORD → CDG Jul 18, 02:52 UTCJul 18, 09:44 UTC6h 52m
2026-07-18 UAL987 - Jul 18, 02:29 UTCJul 18, 03:55 UTC1h 26m
2026-07-17 UAL770 BCN → ORD Jul 17, 14:30 UTCJul 17, 23:10 UTC8h 40m
2026-07-17 UAL769 - Jul 17, 04:25 UTCJul 17, 12:15 UTC7h 50m
2026-07-16 UAL973 - Jul 16, 22:30 UTCJul 16, 22:35 UTC5m
2026-07-16 UAL973 BRU → ORD Jul 16, 14:35 UTCJul 16, 22:35 UTC8h 0m
2026-07-16 UAL973 BRU → ORD Jul 16, 14:36 UTCJul 16, 22:15 UTC7h 39m
2026-07-16 UAL994 - Jul 16, 06:00 UTCJul 16, 12:34 UTC6h 35m
2026-07-15 UAL1981 - Jul 15, 21:50 UTCJul 16, 02:20 UTC4h 30m
2026-07-15 UAL38 - Jul 15, 09:50 UTCJul 15, 19:25 UTC9h 35m
2026-07-14 UAL881 - Jul 14, 19:15 UTCJul 15, 07:10 UTC11h 54m
2026-07-14 UAL881 ORD → HND Jul 14, 19:16 UTCJul 15, 07:09 UTC11h 53m
2026-07-14 UAL945 FRA → ORD Jul 14, 07:10 UTCJul 14, 15:25 UTC8h 15m
2026-07-13 UAL944 ORD → FRA Jul 13, 20:30 UTCJul 14, 04:25 UTC7h 55m
2026-07-13 UAL973 - Jul 13, 08:55 UTCJul 13, 10:25 UTC1h 30m
2026-07-13 UAL973 BRU → ORD Jul 13, 08:46 UTCJul 13, 16:51 UTC8h 5m
2026-07-13 UAL973 BRU → ORD Jul 13, 08:46 UTCJul 13, 16:38 UTC7h 52m
2026-07-12 UAL994 EWR → BRU Jul 12, 23:24 UTCJul 13, 05:36 UTC6h 12m
2026-07-12 UAL994 - Jul 12, 23:05 UTCJul 12, 23:45 UTC40m
2026-07-12 UAL2303 - Jul 12, 06:45 UTCJul 12, 11:20 UTC4h 35m
2026-07-11 UAL212 - Jul 11, 16:20 UTCJul 11, 21:00 UTC4h 40m
2026-07-11 UAL2303 - Jul 11, 06:50 UTCJul 11, 11:15 UTC4h 25m
2026-07-10 UAL212 - Jul 10, 16:35 UTCJul 10, 21:30 UTC4h 56m
2026-07-10 UAL2303 - Jul 10, 06:40 UTCJul 10, 11:20 UTC4h 40m
2026-07-09 UAL2238 - Jul 9, 22:55 UTCJul 10, 03:55 UTC5h 0m
2026-07-09 UAL995 BRU → EWR Jul 9, 09:30 UTCJul 9, 16:50 UTC7h 20m
2026-07-09 UAL972 - Jul 9, 00:10 UTCJul 9, 02:25 UTC2h 15m
2026-07-08 UAL972 ORD → BRU Jul 8, 23:57 UTCJul 9, 07:27 UTC7h 30m
2026-07-08 UAL882 HND → ORD Jul 8, 08:35 UTCJul 8, 19:30 UTC10h 55m
2026-07-07 UAL881 ORD → HND Jul 7, 17:40 UTCJul 8, 06:15 UTC12h 35m
2026-07-07 UAL844 - Jul 7, 01:35 UTCJul 7, 02:15 UTC40m
2026-07-07 UAL844 GRU → ORD Jul 7, 01:42 UTCJul 7, 11:12 UTC9h 30m

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 N16008 page for operator, model, and routing details .

Mode-S A0F427 frequently asked

What is Mode-S code A0F427?
A0F427 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N16008.
Where is Mode-S A0F427 registered?
Mode-S code A0F427 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 A0F427 broadcasting right now?
Yes. Mode-S A0F427 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A0F427, octal 50172047, decimal 10,548,263.
What flights does A0F427 operate?
Mode-S A0F427 has broadcast 20 distinct callsigns, including UAL882, UAL945, UAL986, UAL973, UAL944.