Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A7F4E9

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N61103 · BOEING 787-9 Dreamliner · operated by UNITED AIRLINES INC.

Hex
A7F4E9
Octal
51772351
Decimal
11,007,209
Country
US
Tail
N61103
Type
B789
No current signal · last broadcast 8h ago
Flights observed
101
Distinct callsigns
10
Country
US
Last broadcast
8h ago

Last known position

Most recent position reported by Mode-S A7F4E9.

Country allocation

The ICAO 24-bit address A7F4E9 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 10 distinct

Callsign Airline Flights Last seen
UAL2 United Airlines 20 2026-05-28
UAL1 United Airlines 17 2026-05-27
UAL382 United Airlines 11 2026-04-28
UAL901 United Airlines 10 2026-05-28
UAL900 United Airlines 10 2026-05-29
UAL2498 United Airlines 10 2026-04-28
UAL755 United Airlines 8 2026-04-21
UAL1434 United Airlines 8 2026-04-23
UAL939 United Airlines 4 2026-05-26
UAL930 United Airlines 3 2026-05-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 UAL900 LHR → SFO May 29, 10:00 UTCMay 29, 20:21 UTC10h 21m
2026-05-29 UAL900 LHR → SFO May 29, 10:00 UTCMay 29, 20:24 UTC10h 24m
2026-05-28 UAL901 SFO → LHR May 28, 20:25 UTCMay 29, 06:15 UTC9h 50m
2026-05-28 UAL2 SIN → SFO May 28, 02:40 UTCMay 28, 16:20 UTC13h 40m
2026-05-27 UAL1 SFO → SIN May 27, 06:34 UTCMay 27, 21:00 UTC14h 25m
2026-05-27 UAL1 SFO → SIN May 27, 06:21 UTCMay 27, 22:29 UTC16h 8m
2026-05-26 UAL939 LHR → SFO May 26, 15:35 UTCMay 26, 16:15 UTC40m
2026-05-26 UAL939 LHR → SFO May 26, 15:39 UTCMay 27, 01:42 UTC10h 3m
2026-05-26 UAL930 SFO → LHR May 26, 03:19 UTCMay 26, 13:00 UTC9h 40m
2026-05-24 UAL939 LHR → SFO May 24, 15:35 UTCMay 24, 23:46 UTC8h 11m
2026-05-24 UAL939 LHR → SFO May 24, 15:39 UTCMay 25, 01:55 UTC10h 16m
2026-05-24 UAL930 SFO → LHR May 24, 03:25 UTCMay 24, 13:00 UTC9h 35m
2026-05-24 UAL930 SFO → LHR May 24, 03:26 UTCMay 24, 12:58 UTC9h 32m
2026-05-23 UAL900 LHR → SFO May 23, 09:50 UTCMay 23, 20:10 UTC10h 21m
2026-05-22 UAL901 SFO → LHR May 22, 20:50 UTCMay 23, 06:40 UTC9h 49m
2026-05-22 UAL2 SIN → SFO May 22, 04:05 UTCMay 22, 04:35 UTC30m
2026-05-22 UAL2 SIN → SFO May 22, 02:40 UTCMay 22, 02:50 UTC10m
2026-05-22 UAL2 SIN → SFO May 22, 02:10 UTCMay 22, 17:24 UTC15h 14m
2026-05-21 UAL1 SFO → SIN May 21, 06:50 UTCMay 21, 20:50 UTC14h 0m
2026-05-20 UAL2 SIN → SFO May 20, 03:35 UTCMay 20, 15:55 UTC12h 21m
2026-05-19 UAL1 SFO → SIN May 19, 06:10 UTCMay 19, 20:55 UTC14h 45m
2026-05-18 UAL900 LHR → SFO May 18, 10:05 UTCMay 18, 20:15 UTC10h 9m
2026-05-17 UAL901 SFO → LHR May 17, 21:35 UTCMay 18, 07:15 UTC9h 40m
2026-05-16 UAL2 SIN → SFO May 16, 02:50 UTCMay 16, 16:31 UTC13h 41m
2026-05-16 UAL2 SIN → SFO May 16, 01:41 UTCMay 16, 16:26 UTC14h 45m
2026-05-15 UAL1 SFO → SIN May 15, 06:40 UTCMay 15, 21:15 UTC14h 34m
2026-05-14 UAL900 LHR → SFO May 14, 09:55 UTCMay 14, 20:20 UTC10h 25m
2026-05-13 UAL901 SFO → LHR May 13, 20:45 UTCMay 14, 06:15 UTC9h 30m
2026-05-13 UAL2 SIN → SFO May 13, 04:10 UTCMay 13, 15:40 UTC11h 30m
2026-05-13 UAL2 SIN → SFO May 13, 01:31 UTCMay 13, 15:35 UTC14h 4m
2026-05-12 UAL1 SFO → SIN May 12, 06:40 UTCMay 12, 22:15 UTC15h 35m
2026-05-12 UAL1 SFO → SIN May 12, 06:11 UTCMay 12, 22:33 UTC16h 22m
2026-05-11 UAL900 LHR → SFO May 11, 10:00 UTCMay 11, 20:25 UTC10h 25m
2026-05-10 UAL901 SFO → LHR May 10, 20:40 UTCMay 10, 22:15 UTC1h 35m
2026-05-10 UAL901 SFO → LHR May 10, 20:22 UTCMay 11, 06:18 UTC9h 56m
2026-05-10 UAL2 SIN → SFO May 10, 01:46 UTCMay 10, 16:10 UTC14h 24m
2026-05-10 UAL2 SIN → SFO May 10, 02:55 UTCMay 10, 16:30 UTC13h 35m
2026-05-09 UAL2 SIN → SFO May 9, 20:20 UTCMay 10, 16:30 UTC20h 10m
2026-05-09 UAL2 SIN → SFO May 9, 20:00 UTCMay 10, 16:30 UTC20h 30m
2026-05-09 UAL1 SFO → SIN May 9, 06:26 UTCMay 9, 23:13 UTC16h 47m
2026-05-09 UAL1 SFO → SIN May 9, 06:50 UTCMay 9, 21:40 UTC14h 50m
2026-05-07 UAL900 LHR → SFO May 7, 10:50 UTCMay 7, 20:35 UTC9h 45m
2026-05-06 UAL901 SFO → LHR May 6, 21:05 UTCMay 7, 00:05 UTC3h 0m
2026-05-06 UAL901 SFO → LHR May 6, 20:37 UTCMay 7, 06:53 UTC10h 16m
2026-05-06 UAL2 SIN → SFO May 6, 01:31 UTCMay 6, 15:51 UTC14h 20m
2026-05-05 UAL2 SIN → SFO May 5, 21:05 UTCMay 6, 04:20 UTC7h 15m
2026-05-05 UAL1 SFO → SIN May 5, 06:40 UTCMay 6, 04:20 UTC21h 40m
2026-05-04 UAL900 LHR → SFO May 4, 10:00 UTCMay 4, 20:25 UTC10h 26m
2026-05-03 UAL901 SFO → LHR May 3, 20:20 UTCMay 4, 06:20 UTC10h 0m
2026-05-03 UAL2 SIN → SFO May 3, 04:30 UTCMay 3, 16:05 UTC11h 35m

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 N61103 page for operator, model, and routing details .

Mode-S A7F4E9 frequently asked

What is Mode-S code A7F4E9?
A7F4E9 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N61103.
Where is Mode-S A7F4E9 registered?
Mode-S code A7F4E9 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 A7F4E9 broadcasting right now?
No active broadcast right now. Last signal was 8h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A7F4E9, octal 51772351, decimal 11,007,209.
What flights does A7F4E9 operate?
Mode-S A7F4E9 has broadcast 10 distinct callsigns, including UAL2, UAL1, UAL382, UAL901, UAL900.