Apparatus

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sensors Mode-S transponder

AB0F89

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N81105 · operated by UNITED AIRLINES INC.

Hex
AB0F89
Octal
52607611
Decimal
11,210,633
Country
US
Tail
N81105
No current signal · last broadcast Jul 23, 16:55 UTC
Flights observed
121
Distinct callsigns
9
Country
US
Last broadcast
Jul 23, 16:55 UTC

Last known position

Most recent position reported by Mode-S AB0F89.

Country allocation

The ICAO 24-bit address AB0F89 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 9 distinct

Callsign Airline Flights Last seen
UAL2 United Airlines 29 2026-07-23
UAL1 United Airlines 28 2026-07-22
UAL901 - 17 2026-07-18
UAL900 United Airlines 15 2026-07-19
UAL930 - 12 2026-07-20
BOE785 - 9 2026-05-08
UAL939 United Airlines 8 2026-07-20
UAL3921 United Airlines 2 2026-05-22
UAL4207 United Airlines 1 2026-05-12

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-23 UAL2 SIN → SFO Jul 23, 04:35 UTCJul 23, 16:50 UTC12h 15m
2026-07-23 UAL2 SIN → SFO Jul 23, 01:33 UTCJul 23, 16:42 UTC15h 9m
2026-07-22 UAL1 SFO → SIN Jul 22, 18:35 UTCJul 22, 23:05 UTC4h 30m
2026-07-22 UAL1 SFO → SIN Jul 22, 08:06 UTCJul 22, 23:06 UTC15h 0m
2026-07-20 UAL939 LHR → SFO Jul 20, 16:45 UTCJul 21, 03:05 UTC10h 20m
2026-07-20 UAL930 SFO → LHR Jul 20, 03:20 UTCJul 20, 13:00 UTC9h 40m
2026-07-19 UAL900 LHR → SFO Jul 19, 10:05 UTCJul 19, 20:25 UTC10h 20m
2026-07-18 UAL901 SFO → LHR Jul 18, 20:25 UTCJul 19, 05:50 UTC9h 25m
2026-07-18 UAL2 SIN → SFO Jul 18, 02:25 UTCJul 18, 16:00 UTC13h 36m
2026-07-17 UAL1 - Jul 17, 21:44 UTCJul 17, 22:10 UTC25m
2026-07-17 UAL1 - Jul 17, 06:50 UTCJul 17, 19:15 UTC12h 25m
2026-07-15 UAL939 - Jul 15, 15:55 UTCJul 16, 02:35 UTC10h 40m
2026-07-15 UAL930 SFO → LHR Jul 15, 03:15 UTCJul 15, 12:50 UTC9h 35m
2026-07-14 UAL2 - Jul 14, 04:45 UTCJul 14, 18:45 UTC14h 0m
2026-07-14 UAL2 SIN → SFO Jul 14, 03:21 UTCJul 14, 18:15 UTC14h 54m
2026-07-14 UAL2 SIN → SFO Jul 14, 03:21 UTCJul 14, 18:41 UTC15h 20m
2026-07-13 UAL1 - Jul 13, 07:25 UTCJul 13, 21:40 UTC14h 15m
2026-07-12 UAL900 - Jul 12, 10:25 UTCJul 12, 21:05 UTC10h 40m
2026-07-12 UAL900 LHR → SFO Jul 12, 10:00 UTCJul 12, 20:58 UTC10h 58m
2026-07-11 UAL901 SFO → LHR Jul 11, 20:45 UTCJul 12, 06:20 UTC9h 35m
2026-07-11 UAL901 SFO → LHR Jul 11, 20:27 UTCJul 12, 06:11 UTC9h 44m
2026-07-10 UAL2 - Jul 10, 02:20 UTCJul 10, 17:20 UTC15h 0m
2026-07-09 UAL1 SFO → SIN Jul 9, 07:46 UTCJul 9, 23:24 UTC15h 38m
2026-07-09 UAL1 - Jul 9, 07:50 UTCJul 9, 08:15 UTC25m
2026-07-08 UAL2 - Jul 8, 04:20 UTCJul 8, 16:00 UTC11h 40m
2026-07-07 UAL1 - Jul 7, 22:10 UTCJul 7, 22:20 UTC10m
2026-07-07 UAL1 - Jul 7, 06:25 UTCJul 7, 21:00 UTC14h 35m
2026-07-06 UAL939 - Jul 6, 15:55 UTCJul 7, 02:20 UTC10h 25m
2026-07-06 UAL930 SFO → LHR Jul 6, 03:19 UTCJul 6, 13:06 UTC9h 47m
2026-07-06 UAL930 SFO → LHR Jul 6, 03:35 UTCJul 6, 06:45 UTC3h 10m
2026-07-03 UAL2 - Jul 3, 02:40 UTCJul 3, 15:30 UTC12h 50m
2026-07-03 UAL2 SIN → SFO Jul 3, 01:16 UTCJul 3, 15:25 UTC14h 9m
2026-07-02 UAL1 - Jul 2, 21:50 UTCJul 2, 22:00 UTC10m
2026-07-02 UAL1 SFO → SIN Jul 2, 06:51 UTCJul 2, 22:00 UTC15h 9m
2026-07-02 UAL1 - Jul 2, 06:41 UTCJul 2, 20:45 UTC14h 4m
2026-07-01 UAL900 - Jul 1, 09:50 UTCJul 1, 19:55 UTC10h 5m
2026-06-30 UAL901 SFO → LHR Jun 30, 22:30 UTCJul 1, 07:35 UTC9h 5m
2026-06-30 UAL900 - Jun 30, 09:50 UTCJun 30, 19:50 UTC10h 0m
2026-06-29 UAL901 SFO → LHR Jun 29, 20:27 UTCJun 30, 06:16 UTC9h 49m
2026-06-29 UAL901 SFO → LHR Jun 29, 20:19 UTCJun 30, 00:14 UTC3h 55m
2026-06-29 UAL2 - Jun 29, 02:35 UTCJun 29, 15:39 UTC13h 5m
2026-06-29 UAL2 SIN → SFO Jun 29, 01:16 UTCJun 29, 15:35 UTC14h 19m
2026-06-29 UAL2 - Jun 29, 01:00 UTCJun 29, 01:10 UTC10m
2026-06-28 UAL1 - Jun 28, 21:55 UTCJun 28, 22:04 UTC10m
2026-06-28 UAL1 SFO → SIN Jun 28, 06:36 UTCJun 28, 22:03 UTC15h 27m
2026-06-28 UAL1 - Jun 28, 06:44 UTCJun 28, 20:34 UTC13h 50m
2026-06-26 UAL900 - Jun 26, 09:55 UTCJun 26, 20:10 UTC10h 15m
2026-06-26 UAL901 SFO → LHR Jun 26, 05:50 UTCJun 26, 06:15 UTC25m
2026-06-25 UAL901 SFO → LHR Jun 25, 20:30 UTCJun 26, 05:44 UTC9h 15m
2026-06-25 UAL2 - Jun 25, 02:25 UTCJun 25, 16:05 UTC13h 40m

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 N81105 page for operator, model, and routing details .

Mode-S AB0F89 frequently asked

What is Mode-S code AB0F89?
AB0F89 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N81105.
Where is Mode-S AB0F89 registered?
Mode-S code AB0F89 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 AB0F89 broadcasting right now?
No active broadcast right now. Last signal was Jul 23, 16:55 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AB0F89, octal 52607611, decimal 11,210,633.
What flights does AB0F89 operate?
Mode-S AB0F89 has broadcast 9 distinct callsigns, including UAL2, UAL1, UAL901, UAL900, UAL930.