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 · 14,150 ft
Flights observed
233
Distinct callsigns
20
Country
US
Last broadcast
2h ago

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 - 12 2026-06-19
UAL944 - 12 2026-07-13
UAL844 - 10 2026-07-07
UAL65 United Airlines 10 2026-05-23
UAL973 - 9 2026-07-13
UAL64 United Airlines 9 2026-05-23
UAL845 United Airlines 8 2026-07-06
UAL39 - 8 2026-06-27
UAL971 - 7 2026-07-03
UAL422 United Airlines 7 2026-06-11
UAL125 - 7 2026-06-30
UAL124 - 7 2026-06-29
UAL994 - 6 2026-07-12
UAL906 - 6 2026-06-20
UAL219 United Airlines 6 2026-06-14
UAL995 - 5 2026-07-09
UAL986 United Airlines 5 2026-05-28
UAL972 - 5 2026-07-09
UAL970 - 5 2026-07-03

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
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
2026-07-06 UAL845 ORD → GRU Jul 6, 04:15 UTCJul 6, 13:40 UTC9h 25m
2026-07-05 UAL203 - Jul 5, 06:05 UTCJul 5, 09:45 UTC3h 40m
2026-07-05 UAL203 OGG → ORD Jul 5, 02:29 UTCJul 5, 09:38 UTC7h 9m
2026-07-04 UAL202 - Jul 4, 15:00 UTCJul 4, 18:50 UTC3h 50m
2026-07-03 UAL971 - Jul 3, 13:15 UTCJul 3, 23:15 UTC10h 0m
2026-07-03 UAL971 FCO → ORD Jul 3, 12:57 UTCJul 3, 22:51 UTC9h 54m
2026-07-03 UAL970 - Jul 3, 01:25 UTCJul 3, 07:45 UTC6h 20m
2026-07-03 UAL970 ORD → FCO Jul 3, 01:07 UTCJul 3, 10:06 UTC8h 59m
2026-07-02 UAL973 BRU → ORD Jul 2, 09:20 UTCJul 2, 17:45 UTC8h 25m
2026-07-01 UAL994 PBI → ORD Jul 1, 23:40 UTCJul 2, 06:15 UTC6h 35m
2026-06-30 UAL125 ATH → EWR Jun 30, 08:20 UTCJun 30, 17:55 UTC9h 35m
2026-06-29 UAL124 EWR → ATH Jun 29, 21:03 UTCJun 30, 05:43 UTC8h 40m
2026-06-29 UAL124 - Jun 29, 21:05 UTCJun 30, 05:50 UTC8h 46m
2026-06-29 UAL995 - Jun 29, 10:15 UTCJun 29, 17:40 UTC7h 25m
2026-06-29 UAL972 - Jun 29, 00:00 UTCJun 29, 07:15 UTC7h 15m
2026-06-28 UAL882 HND → ORD Jun 28, 09:20 UTCJun 28, 20:34 UTC11h 15m
2026-06-27 UAL39 - Jun 27, 19:24 UTCJun 28, 06:44 UTC11h 20m
2026-06-27 UAL2445 - Jun 27, 11:20 UTCJun 27, 16:30 UTC5h 10m
2026-06-26 UAL1981 DEN → LGA Jun 26, 18:54 UTCJun 26, 23:09 UTC4h 15m
2026-06-26 UAL2445 - Jun 26, 11:24 UTCJun 26, 16:24 UTC5h 0m
2026-06-26 UAL2397 LAX → EWR Jun 26, 04:14 UTCJun 26, 09:10 UTC4h 55m
2026-06-25 UAL212 - Jun 25, 17:14 UTCJun 25, 22:20 UTC5h 5m
2026-06-24 UAL1855 - Jun 24, 20:44 UTCJun 25, 01:19 UTC4h 35m
2026-06-24 UAL2692 - Jun 24, 13:30 UTCJun 24, 18:44 UTC5h 15m
2026-06-24 UAL2397 - Jun 24, 04:15 UTCJun 24, 08:35 UTC4h 20m
2026-06-23 UAL38 HND → LAX Jun 23, 09:35 UTCJun 23, 18:52 UTC9h 17m
2026-06-23 UAL38 - Jun 23, 09:24 UTCJun 23, 09:59 UTC35m
2026-06-22 UAL881 - Jun 22, 17:50 UTCJun 23, 05:34 UTC11h 45m
2026-06-22 UAL844 - Jun 22, 01:35 UTCJun 22, 11:19 UTC9h 45m
2026-06-22 UAL844 GRU → ORD Jun 22, 01:42 UTCJun 22, 11:10 UTC9h 28m
2026-06-21 UAL845 ORD → GRU Jun 21, 03:30 UTCJun 21, 12:35 UTC9h 5m

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, UAL944, UAL844, UAL65.