Apparatus

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sensors Mode-S transponder

A7F4EC

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N61106 · operated by UNITED AIRLINES INC.

Hex
A7F4EC
Octal
51772354
Decimal
11,007,212
Country
US
Tail
N61106
No current signal · last broadcast 1d ago
Flights observed
97
Distinct callsigns
14
Country
US
Last broadcast
1d ago

Last known position

Most recent position reported by Mode-S A7F4EC.

Country allocation

The ICAO 24-bit address A7F4EC 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 14 distinct

Callsign Airline Flights Last seen
UAL2 United Airlines 18 2026-07-21
UAL1 United Airlines 17 2026-07-26
UAL930 United Airlines 13 2026-07-25
UAL939 United Airlines 11 2026-07-25
UAL900 United Airlines 10 2026-07-22
UAL901 - 8 2026-07-21
BOE786 - 5 2026-05-27
UAL1757 - 4 2026-06-15
UAL1849 United Airlines 3 2026-06-14
UAL948 United Airlines 2 2026-07-24
UAL29 - 2 2026-07-04
UAL28 - 2 2026-07-05
UAL949 United Airlines 1 2026-07-24
UAL4210 United Airlines 1 2026-05-30

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL1 SFO → SIN Jul 26, 22:10 UTCJul 26, 22:25 UTC15m
2026-07-26 UAL1 SFO → SIN Jul 26, 07:00 UTCJul 26, 20:55 UTC13h 55m
2026-07-25 UAL939 LHR → SFO Jul 25, 17:20 UTCJul 26, 04:00 UTC10h 40m
2026-07-25 UAL930 SFO → LHR Jul 25, 05:29 UTCJul 25, 14:32 UTC9h 3m
2026-07-25 UAL930 SFO → LHR Jul 25, 05:15 UTCJul 25, 14:50 UTC9h 35m
2026-07-24 UAL949 LHR → SFO Jul 24, 12:20 UTCJul 24, 22:45 UTC10h 25m
2026-07-24 UAL948 SFO → LHR Jul 24, 00:14 UTCJul 24, 09:51 UTC9h 37m
2026-07-24 UAL948 SFO → LHR Jul 24, 00:30 UTCJul 24, 10:00 UTC9h 30m
2026-07-22 UAL900 LHR → SFO Jul 22, 10:00 UTCJul 22, 20:33 UTC10h 33m
2026-07-21 UAL901 - Jul 21, 20:30 UTCJul 22, 05:25 UTC8h 55m
2026-07-21 UAL2 SIN → SFO Jul 21, 01:16 UTCJul 21, 16:06 UTC14h 50m
2026-07-20 UAL1 SFO → SIN Jul 20, 06:55 UTCJul 20, 21:00 UTC14h 5m
2026-07-18 UAL939 LHR → SFO Jul 18, 15:45 UTCJul 19, 02:10 UTC10h 25m
2026-07-18 UAL930 SFO → LHR Jul 18, 03:19 UTCJul 18, 12:39 UTC9h 20m
2026-07-18 UAL930 SFO → LHR Jul 18, 03:15 UTCJul 18, 12:45 UTC9h 30m
2026-07-17 UAL900 - Jul 17, 10:05 UTCJul 17, 20:25 UTC10h 20m
2026-07-16 UAL901 SFO → LHR Jul 16, 20:55 UTCJul 17, 06:25 UTC9h 30m
2026-07-16 UAL2 - Jul 16, 02:35 UTCJul 16, 16:30 UTC13h 55m
2026-07-16 UAL2 - Jul 16, 01:00 UTCJul 16, 01:10 UTC10m
2026-07-15 UAL1 - Jul 15, 21:55 UTCJul 15, 22:05 UTC10m
2026-07-15 UAL1 - Jul 15, 06:30 UTCJul 15, 20:40 UTC14h 10m
2026-07-14 UAL939 - Jul 14, 16:00 UTCJul 14, 17:00 UTC1h 0m
2026-07-14 UAL939 LHR → SFO Jul 14, 15:54 UTCJul 15, 02:31 UTC10h 37m
2026-07-14 UAL930 SFO → LHR Jul 14, 03:19 UTCJul 14, 12:43 UTC9h 24m
2026-07-14 UAL930 SFO → LHR Jul 14, 03:20 UTCJul 14, 12:50 UTC9h 30m
2026-07-13 UAL900 - Jul 13, 10:15 UTCJul 13, 20:40 UTC10h 25m
2026-07-12 UAL901 SFO → LHR Jul 12, 20:30 UTCJul 13, 06:05 UTC9h 35m
2026-07-12 UAL2 - Jul 12, 04:15 UTCJul 12, 16:10 UTC11h 55m
2026-07-12 UAL2 - Jul 12, 01:05 UTCJul 12, 01:15 UTC10m
2026-07-11 UAL1 - Jul 11, 22:05 UTCJul 11, 22:15 UTC10m
2026-07-11 UAL1 - Jul 11, 06:40 UTCJul 11, 18:30 UTC11h 50m
2026-07-10 UAL939 - Jul 10, 15:50 UTCJul 11, 02:20 UTC10h 30m
2026-07-10 UAL930 SFO → LHR Jul 10, 03:40 UTCJul 10, 13:25 UTC9h 45m
2026-07-09 UAL2 - Jul 9, 02:25 UTCJul 9, 16:20 UTC13h 55m
2026-07-08 UAL1 SFO → SIN Jul 8, 06:21 UTCJul 8, 21:58 UTC15h 37m
2026-07-08 UAL1 - Jul 8, 06:15 UTCJul 8, 22:05 UTC15h 50m
2026-07-07 UAL939 - Jul 7, 15:35 UTCJul 8, 02:05 UTC10h 30m
2026-07-07 UAL930 SFO → LHR Jul 7, 03:19 UTCJul 7, 12:41 UTC9h 22m
2026-07-07 UAL930 SFO → LHR Jul 7, 03:25 UTCJul 7, 06:25 UTC3h 0m
2026-07-05 UAL28 - Jul 5, 17:05 UTCJul 6, 04:50 UTC11h 45m
2026-07-05 UAL28 - Jul 5, 14:15 UTCJul 5, 14:25 UTC10m
2026-07-04 UAL29 SFO → SIN Jul 4, 20:50 UTCJul 5, 12:05 UTC15h 15m
2026-07-04 UAL29 - Jul 4, 20:50 UTCJul 5, 10:30 UTC13h 40m
2026-07-04 UAL2 - Jul 4, 03:00 UTCJul 4, 04:40 UTC1h 40m
2026-07-04 UAL2 - Jul 4, 01:25 UTCJul 4, 01:35 UTC10m
2026-07-04 UAL2 SIN → SFO Jul 4, 01:16 UTCJul 4, 16:40 UTC15h 24m
2026-07-04 UAL2 SIN → SFO Jul 4, 01:16 UTCJul 4, 16:44 UTC15h 28m
2026-07-03 UAL1 - Jul 3, 22:00 UTCJul 3, 22:10 UTC10m
2026-07-03 UAL1 - Jul 3, 07:05 UTCJul 3, 20:50 UTC13h 45m
2026-07-02 UAL939 - Jul 2, 15:35 UTCJul 3, 01:50 UTC10h 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 N61106 page for operator, model, and routing details .

Mode-S A7F4EC frequently asked

What is Mode-S code A7F4EC?
A7F4EC is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N61106.
Where is Mode-S A7F4EC registered?
Mode-S code A7F4EC 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 A7F4EC 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 A7F4EC, octal 51772354, decimal 11,007,212.
What flights does A7F4EC operate?
Mode-S A7F4EC has broadcast 14 distinct callsigns, including UAL2, UAL1, UAL930, UAL939, UAL900.