Apparatus

Try JFK, AAL1290, BAW, or N225AN.

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 2h ago
Flights observed
49
Distinct callsigns
9
Country
US
Last broadcast
2h ago

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 9 2026-06-09
BOE785 - 9 2026-05-08
UAL900 United Airlines 7 2026-06-10
UAL1 United Airlines 7 2026-06-11
UAL901 United Airlines 6 2026-06-09
UAL930 United Airlines 5 2026-06-07
UAL939 United Airlines 3 2026-06-07
UAL3921 United Airlines 2 2026-05-22
UAL4207 United Airlines 1 2026-05-12

Recent flights last 49

DateFlightRouteTakeoffLandingDuration
2026-06-11 UAL1 SFO → SIN Jun 11, 07:05 UTCJun 11, 07:25 UTC20m
2026-06-10 UAL900 LHR → SFO Jun 10, 14:05 UTCJun 10, 20:00 UTC5h 55m
2026-06-09 UAL901 SFO → LHR Jun 9, 20:50 UTCJun 10, 06:10 UTC9h 20m
2026-06-09 UAL2 SIN → SFO Jun 9, 03:30 UTCJun 9, 15:50 UTC12h 20m
2026-06-09 UAL2 SIN → SFO Jun 9, 01:26 UTCJun 9, 15:53 UTC14h 27m
2026-06-08 UAL1 SFO → SIN Jun 8, 06:45 UTCJun 8, 06:55 UTC10m
2026-06-07 UAL939 LHR → SFO Jun 7, 15:45 UTCJun 8, 01:50 UTC10h 5m
2026-06-07 UAL930 SFO → LHR Jun 7, 03:20 UTCJun 7, 12:55 UTC9h 35m
2026-06-06 UAL900 LHR → SFO Jun 6, 10:09 UTCJun 6, 20:10 UTC10h 0m
2026-06-05 UAL901 SFO → LHR Jun 5, 20:35 UTCJun 6, 06:25 UTC9h 50m
2026-06-04 UAL900 LHR → SFO Jun 4, 10:50 UTCJun 4, 20:50 UTC10h 0m
2026-06-03 UAL901 SFO → LHR Jun 3, 20:45 UTCJun 4, 06:20 UTC9h 35m
2026-06-03 UAL2 SIN → SFO Jun 3, 02:35 UTCJun 3, 16:05 UTC13h 30m
2026-06-03 UAL2 SIN → SFO Jun 3, 01:05 UTCJun 3, 01:15 UTC10m
2026-06-02 UAL1 SFO → SIN Jun 2, 06:50 UTCJun 2, 21:15 UTC14h 25m
2026-06-01 UAL900 LHR → SFO Jun 1, 09:55 UTCJun 1, 19:53 UTC9h 58m
2026-06-01 UAL900 LHR → SFO Jun 1, 09:55 UTCJun 1, 11:00 UTC1h 5m
2026-05-31 UAL901 SFO → LHR May 31, 20:40 UTCJun 1, 06:45 UTC10h 5m
2026-05-31 UAL2 SIN → SFO May 31, 15:15 UTCMay 31, 15:55 UTC40m
2026-05-30 UAL1 SFO → SIN May 30, 06:28 UTCMay 30, 22:22 UTC15h 54m
2026-05-30 UAL1 SFO → SIN May 30, 06:20 UTCMay 30, 19:25 UTC13h 5m
2026-05-29 UAL939 LHR → SFO May 29, 15:50 UTCMay 30, 02:10 UTC10h 20m
2026-05-29 UAL930 SFO → LHR May 29, 03:19 UTCMay 29, 13:20 UTC10h 1m
2026-05-29 UAL930 SFO → LHR May 29, 03:35 UTCMay 29, 13:25 UTC9h 50m
2026-05-27 UAL900 LHR → SFO May 27, 10:50 UTCMay 27, 12:05 UTC1h 15m
2026-05-27 UAL900 LHR → SFO May 27, 10:00 UTCMay 27, 21:05 UTC11h 5m
2026-05-26 UAL901 SFO → LHR May 26, 20:32 UTCMay 27, 06:17 UTC9h 45m
2026-05-26 UAL901 SFO → LHR May 26, 20:40 UTCMay 27, 06:15 UTC9h 35m
2026-05-26 UAL2 SIN → SFO May 26, 16:40 UTCMay 26, 16:45 UTC5m
2026-05-26 UAL2 SIN → SFO May 26, 04:39 UTCMay 26, 08:04 UTC3h 25m
2026-05-26 UAL2 SIN → SFO May 26, 01:16 UTCMay 26, 16:24 UTC15h 8m
2026-05-26 UAL2 SIN → SFO May 26, 01:16 UTCMay 26, 16:32 UTC15h 16m
2026-05-25 UAL1 SFO → SIN May 25, 06:21 UTCMay 25, 22:23 UTC16h 2m
2026-05-25 UAL1 SFO → SIN May 25, 06:30 UTCMay 25, 22:34 UTC16h 5m
2026-05-23 UAL939 LHR → SFO May 23, 15:45 UTCMay 24, 02:00 UTC10h 16m
2026-05-23 UAL930 SFO → LHR May 23, 03:29 UTCMay 23, 12:57 UTC9h 28m
2026-05-23 UAL930 SFO → LHR May 23, 03:20 UTCMay 23, 13:00 UTC9h 40m
2026-05-22 UAL3921 NCE → EWR May 22, 15:10 UTCMay 22, 20:10 UTC5h 0m
2026-05-22 UAL3921 NCE → EWR May 22, 14:20 UTCMay 22, 20:08 UTC5h 48m
2026-05-12 UAL4207 BFI → SEA May 12, 17:15 UTCMay 12, 18:20 UTC1h 5m
2026-05-08 BOE785 - May 8, 19:20 UTCMay 8, 19:55 UTC35m
2026-05-02 BOE785 - May 2, 15:30 UTCMay 2, 16:00 UTC30m
2026-04-30 BOE785 - Apr 30, 15:20 UTCApr 30, 18:55 UTC3h 35m
2026-04-23 BOE785 - Apr 23, 15:45 UTCApr 23, 16:40 UTC55m
2026-04-20 BOE785 - Apr 20, 16:35 UTCApr 20, 17:25 UTC50m
2026-04-17 BOE785 - Apr 17, 17:45 UTCApr 17, 18:45 UTC1h 0m
2026-04-13 BOE785 - Apr 13, 16:15 UTCApr 13, 18:15 UTC2h 0m
2026-04-13 BOE785 - Apr 13, 15:50 UTCApr 13, 18:15 UTC2h 25m
2026-04-13 BOE785 - Apr 13, 15:05 UTCApr 13, 16:15 UTC1h 10m

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 2h ago.
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, BOE785, UAL900, UAL1, UAL901.