Apparatus

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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 1d ago
Flights observed
183
Distinct callsigns
12
Country
US
Last broadcast
1d 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 12 distinct

Callsign Airline Flights Last seen
UAL2 - 36 2026-07-11
UAL1 - 32 2026-07-10
UAL900 - 24 2026-07-09
UAL901 - 23 2026-07-08
UAL939 - 15 2026-07-12
UAL930 - 13 2026-07-12
UAL382 United Airlines 11 2026-04-28
UAL2498 United Airlines 10 2026-04-28
UAL755 United Airlines 8 2026-04-21
UAL1434 United Airlines 8 2026-04-23
UAL1849 United Airlines 2 2026-06-30
UAL1757 - 1 2026-06-30

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-12 UAL939 - Jul 12, 15:55 UTCJul 13, 02:15 UTC10h 20m
2026-07-12 UAL930 SFO → LHR Jul 12, 03:15 UTCJul 12, 12:45 UTC9h 30m
2026-07-11 UAL2 - Jul 11, 02:45 UTCJul 11, 17:05 UTC14h 20m
2026-07-11 UAL2 SIN → SFO Jul 11, 01:16 UTCJul 11, 17:13 UTC15h 57m
2026-07-10 UAL1 - Jul 10, 22:15 UTCJul 10, 22:25 UTC10m
2026-07-10 UAL1 - Jul 10, 06:50 UTCJul 10, 07:20 UTC30m
2026-07-09 UAL900 LHR → SFO Jul 9, 10:00 UTCJul 9, 20:00 UTC10h 0m
2026-07-09 UAL900 LHR → SFO Jul 9, 10:00 UTCJul 9, 20:12 UTC10h 12m
2026-07-09 UAL900 - Jul 9, 09:50 UTCJul 9, 10:15 UTC25m
2026-07-08 UAL901 SFO → LHR Jul 8, 20:27 UTCJul 9, 05:56 UTC9h 29m
2026-07-08 UAL901 SFO → LHR Jul 8, 20:20 UTCJul 9, 06:00 UTC9h 40m
2026-07-07 UAL2 - Jul 7, 02:25 UTCJul 7, 15:30 UTC13h 5m
2026-07-07 UAL2 - Jul 7, 00:55 UTCJul 7, 01:05 UTC10m
2026-07-06 UAL1 SFO → SIN Jul 6, 06:21 UTCJul 6, 22:04 UTC15h 43m
2026-07-06 UAL1 - Jul 6, 06:25 UTCJul 6, 20:20 UTC13h 55m
2026-07-05 UAL900 - Jul 5, 15:40 UTCJul 6, 02:15 UTC10h 35m
2026-07-05 UAL901 SFO → LHR Jul 5, 04:00 UTCJul 5, 13:20 UTC9h 20m
2026-07-04 UAL900 - Jul 4, 09:55 UTCJul 4, 20:15 UTC10h 20m
2026-07-03 UAL901 SFO → LHR Jul 3, 20:25 UTCJul 4, 06:00 UTC9h 35m
2026-07-02 UAL2 - Jul 2, 02:35 UTCJul 2, 16:40 UTC14h 5m
2026-07-01 UAL1 SFO → SIN Jul 1, 06:39 UTCJul 1, 21:47 UTC15h 8m
2026-07-01 UAL1 - Jul 1, 06:30 UTCJul 1, 06:55 UTC25m
2026-06-30 UAL1757 - Jun 30, 22:15 UTCJul 1, 03:20 UTC5h 5m
2026-06-30 UAL1849 MCO → EWR Jun 30, 15:34 UTCJun 30, 19:54 UTC4h 20m
2026-06-30 UAL1849 MCO → EWR Jun 30, 15:25 UTCJun 30, 19:55 UTC4h 30m
2026-06-29 UAL900 - Jun 29, 10:04 UTCJun 29, 19:49 UTC9h 45m
2026-06-28 UAL901 SFO → LHR Jun 28, 20:27 UTCJun 29, 05:52 UTC9h 25m
2026-06-28 UAL901 SFO → LHR Jun 28, 20:25 UTCJun 28, 23:25 UTC3h 0m
2026-06-28 UAL2 - Jun 28, 02:29 UTCJun 28, 07:44 UTC5h 15m
2026-06-28 UAL2 SIN → SFO Jun 28, 01:21 UTCJun 28, 15:50 UTC14h 29m
2026-06-27 UAL1 - Jun 27, 21:44 UTCJun 27, 21:55 UTC10m
2026-06-27 UAL1 SFO → SIN Jun 27, 06:21 UTCJun 27, 21:54 UTC15h 33m
2026-06-27 UAL1 - Jun 27, 06:25 UTCJun 27, 20:29 UTC14h 5m
2026-06-26 UAL939 - Jun 26, 16:05 UTCJun 26, 16:14 UTC10m
2026-06-26 UAL939 LHR → SFO Jun 26, 15:45 UTCJun 27, 02:14 UTC10h 29m
2026-06-26 UAL930 SFO → LHR Jun 26, 03:54 UTCJun 26, 13:30 UTC9h 35m
2026-06-24 UAL900 - Jun 24, 10:14 UTCJun 24, 20:30 UTC10h 15m
2026-06-23 UAL901 SFO → LHR Jun 23, 20:54 UTCJun 24, 06:35 UTC9h 40m
2026-06-23 UAL901 SFO → LHR Jun 23, 20:41 UTCJun 24, 06:34 UTC9h 53m
2026-06-23 UAL2 - Jun 23, 04:05 UTCJun 23, 15:30 UTC11h 25m
2026-06-23 UAL2 SIN → SFO Jun 23, 01:16 UTCJun 23, 15:27 UTC14h 11m
2026-06-22 UAL1 - Jun 22, 06:35 UTCJun 22, 21:59 UTC15h 25m
2026-06-21 UAL939 LHR → SFO Jun 21, 16:14 UTCJun 22, 02:26 UTC10h 12m
2026-06-21 UAL930 SFO → LHR Jun 21, 03:56 UTCJun 21, 13:48 UTC9h 52m
2026-06-21 UAL930 SFO → LHR Jun 21, 03:55 UTCJun 21, 06:44 UTC2h 50m
2026-06-19 UAL900 LHR → SFO Jun 19, 09:49 UTCJun 19, 19:59 UTC10h 10m
2026-06-19 UAL900 LHR → SFO Jun 19, 10:00 UTCJun 19, 19:55 UTC9h 55m
2026-06-18 UAL901 SFO → LHR Jun 18, 20:40 UTCJun 19, 06:24 UTC9h 44m
2026-06-17 UAL939 - Jun 17, 15:50 UTCJun 18, 02:00 UTC10h 10m
2026-06-17 UAL930 SFO → LHR Jun 17, 03:30 UTCJun 17, 13:25 UTC9h 55m

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 1d 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 12 distinct callsigns, including UAL2, UAL1, UAL900, UAL901, UAL939.