Apparatus

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sensors Mode-S transponder

A0BF90

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N14735 · BOEING 737-700 · operated by UNITED AIRLINES INC

Hex
A0BF90
Octal
50137620
Decimal
10,534,800
Country
US
Tail
N14735
Type
B737
Broadcasting now · callsign UAL1690 · 40,000 ft
Flights observed
232
Distinct callsigns
20
Country
US
Last broadcast
24d ago

Current position

A0BF90 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A0BF90 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 20 distinct

Callsign Airline Flights Last seen
UAL1928 United Airlines 7 2026-07-23
UAL1193 - 6 2026-07-13
UAL2037 - 5 2026-06-27
UAL1941 - 5 2026-07-13
UAL1884 United Airlines 5 2026-07-23
UAL1024 - 5 2026-06-26
UAL768 United Airlines 4 2026-07-24
UAL382 United Airlines 4 2026-07-23
UAL374 United Airlines 4 2026-07-23
UAL2795 - 4 2026-07-11
UAL2684 United Airlines 4 2026-07-25
UAL2243 United Airlines 4 2026-07-21
UAL1862 United Airlines 4 2026-07-24
UAL1557 United Airlines 4 2026-07-25
UAL1089 - 4 2026-06-26
UAL791 United Airlines 3 2026-07-19
UAL456 United Airlines 3 2026-07-16
UAL291 United Airlines 3 2026-07-20
UAL2631 United Airlines 3 2026-07-20
UAL2465 United Airlines 3 2026-07-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL1513 IAH → SFO Jul 26, 19:40 UTCJul 26, 22:00 UTC2h 20m
2026-07-26 UAL1418 SFO → DEN Jul 26, 14:30 UTCJul 26, 17:00 UTC2h 30m
2026-07-26 UAL299 EWR → RSW Jul 26, 11:30 UTCJul 26, 13:15 UTC1h 45m
2026-07-25 UAL8114 ORD → DCA Jul 25, 23:55 UTCJul 26, 01:20 UTC1h 25m
2026-07-25 UAL2202 ORD → EWR Jul 25, 19:40 UTCJul 25, 21:55 UTC2h 15m
2026-07-25 UAL224 ORD → EWR Jul 25, 14:40 UTCJul 25, 16:00 UTC1h 20m
2026-07-25 UAL224 ORD → EWR Jul 25, 14:47 UTCJul 25, 17:22 UTC2h 35m
2026-07-25 UAL2684 PHL → ORD Jul 25, 10:40 UTCJul 25, 12:05 UTC1h 25m
2026-07-25 UAL1557 OGG → SFO Jul 25, 00:00 UTCJul 25, 01:15 UTC1h 15m
2026-07-24 UAL1989 SFO → IAH Jul 24, 20:50 UTCJul 24, 22:05 UTC1h 15m
2026-07-24 UAL1781 EWR → CHS Jul 24, 18:20 UTCJul 24, 19:05 UTC45m
2026-07-24 UAL1862 ORD → PUJ Jul 24, 13:20 UTCJul 24, 16:45 UTC3h 25m
2026-07-24 UAL768 RDU → EWR Jul 24, 01:35 UTCJul 24, 05:15 UTC3h 40m
2026-07-23 UAL1884 EWR → RSW Jul 23, 22:40 UTCJul 24, 00:00 UTC1h 20m
2026-07-23 UAL1928 IAH → MSY Jul 23, 19:50 UTCJul 23, 20:50 UTC1h 0m
2026-07-23 UAL374 EWR → PBI Jul 23, 16:00 UTCJul 23, 18:10 UTC2h 10m
2026-07-23 UAL382 IAH → SAT Jul 23, 13:25 UTCJul 23, 14:45 UTC1h 20m
2026-07-22 UAL2072 EWR → ATL Jul 22, 22:36 UTCJul 23, 00:43 UTC2h 7m
2026-07-22 UAL2072 EWR → ATL Jul 22, 22:25 UTCJul 23, 01:10 UTC2h 45m
2026-07-22 UAL1955 IAD → PHX Jul 22, 18:10 UTCJul 22, 21:10 UTC3h 0m
2026-07-22 UAL2032 LAX → SFO Jul 22, 14:04 UTCJul 22, 15:56 UTC1h 52m
2026-07-21 UAL378 ORD → EWR Jul 21, 22:05 UTCJul 22, 16:10 UTC18h 5m
2026-07-21 UAL1288 OGG → SFO Jul 21, 14:15 UTCJul 21, 18:00 UTC3h 45m
2026-07-21 UAL2243 SFO → EUG Jul 21, 01:55 UTCJul 21, 05:45 UTC3h 50m
2026-07-20 UAL291 CLT → EWR Jul 20, 21:10 UTCJul 20, 22:38 UTC1h 28m
2026-07-20 UAL291 CLT → EWR Jul 20, 21:05 UTCJul 20, 22:55 UTC1h 50m
2026-07-20 UAL2631 ORD → MCI Jul 20, 16:20 UTCJul 20, 18:05 UTC1h 45m
2026-07-20 UAL2465 IAD → PWM Jul 20, 13:00 UTCJul 20, 14:20 UTC1h 20m
2026-07-20 UAL2063 PHL → ORD Jul 20, 01:25 UTCJul 20, 02:20 UTC55m
2026-07-19 UAL545 LIH → SFO Jul 19, 23:10 UTCJul 20, 00:05 UTC55m
2026-07-19 UAL1069 SFO → LAX Jul 19, 20:15 UTCJul 19, 20:55 UTC40m
2026-07-19 UAL1288 OGG → SFO Jul 19, 15:05 UTCJul 19, 18:20 UTC3h 15m
2026-07-19 UAL2243 SFO → EUG Jul 19, 10:10 UTCJul 19, 13:35 UTC3h 25m
2026-07-19 UAL791 BZN → ORD Jul 19, 04:40 UTCJul 19, 04:45 UTC5m
2026-07-19 UAL791 BZN → ORD Jul 19, 03:00 UTCJul 19, 04:45 UTC1h 45m
2026-07-19 UAL791 BZN → ORD Jul 19, 02:32 UTCJul 19, 04:24 UTC1h 52m
2026-07-19 UAL2124 ORD → BWI Jul 19, 00:08 UTCJul 19, 01:39 UTC1h 31m
2026-07-18 UAL2124 - Jul 18, 23:55 UTCJul 19, 01:50 UTC1h 55m
2026-07-18 UAL1862 - Jul 18, 14:40 UTCJul 18, 18:05 UTC3h 25m
2026-07-18 UAL768 - Jul 18, 05:30 UTCJul 18, 08:50 UTC3h 20m
2026-07-18 UAL1884 - Jul 18, 00:29 UTCJul 18, 02:00 UTC1h 30m
2026-07-18 UAL1884 BNA → ORD Jul 18, 00:16 UTCJul 18, 01:40 UTC1h 24m
2026-07-17 UAL1928 ORD → BNA Jul 17, 20:00 UTCJul 17, 21:05 UTC1h 5m
2026-07-17 UAL1928 ORD → BNA Jul 17, 19:45 UTCJul 17, 21:06 UTC1h 21m
2026-07-17 UAL374 EWR → PBI Jul 17, 16:24 UTCJul 17, 18:00 UTC1h 35m
2026-07-17 UAL382 PWK → DCA Jul 17, 13:50 UTCJul 17, 15:10 UTC1h 20m
2026-07-17 UAL1793 DCA → ORD Jul 17, 10:44 UTCJul 17, 12:25 UTC1h 40m
2026-07-16 UAL456 EWR → SRQ Jul 16, 23:15 UTCJul 17, 00:30 UTC1h 15m
2026-07-16 UAL456 EWR → SRQ Jul 16, 22:54 UTCJul 17, 00:36 UTC1h 42m
2026-07-16 UAL456 EWR → SRQ Jul 16, 19:05 UTCJul 16, 21:30 UTC2h 25m

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 N14735 page for operator, model, and routing details .

Mode-S A0BF90 frequently asked

What is Mode-S code A0BF90?
A0BF90 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N14735.
Where is Mode-S A0BF90 registered?
Mode-S code A0BF90 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 A0BF90 broadcasting right now?
Yes. Mode-S A0BF90 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A0BF90, octal 50137620, decimal 10,534,800.
What flights does A0BF90 operate?
Mode-S A0BF90 has broadcast 20 distinct callsigns, including UAL1928, UAL1193, UAL2037, UAL1941, UAL1884.