Apparatus

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sensors Mode-S transponder

A0FBFA

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N16234 · BOEING 737-800 · operated by UNITED AIRLINES INC

Hex
A0FBFA
Octal
50175772
Decimal
10,550,266
Country
US
Tail
N16234
Type
B738
No current signal · last broadcast Jul 26, 22:30 UTC
Flights observed
463
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:30 UTC

Last known position

Most recent position reported by Mode-S A0FBFA.

Country allocation

The ICAO 24-bit address A0FBFA 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
UAL2000 - 5 2026-07-17
UAL1504 - 5 2026-07-15
UAL586 United Airlines 4 2026-07-23
UAL532 - 4 2026-07-11
UAL493 United Airlines 4 2026-06-09
UAL484 - 4 2026-06-17
UAL480 United Airlines 4 2026-06-01
UAL357 United Airlines 4 2026-05-04
UAL2745 - 4 2026-06-20
UAL2459 United Airlines 4 2026-04-28
UAL2306 - 4 2026-06-16
UAL2167 - 4 2026-07-19
UAL2124 - 4 2026-06-27
UAL1502 - 4 2026-07-14
UAL1156 United Airlines 4 2026-05-20
UAL583 United Airlines 3 2026-04-23
UAL403 United Airlines 3 2026-05-19
UAL2849 United Airlines 3 2026-06-09
UAL2438 United Airlines 3 2026-04-15
UAL2409 United Airlines 3 2026-04-28

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL1212 SFO → PVR Jul 26, 16:10 UTCJul 26, 22:30 UTC6h 20m
2026-07-26 UAL1954 RDM → SFO Jul 26, 13:15 UTCJul 26, 13:45 UTC30m
2026-07-25 UAL1208 IAH → EWR Jul 25, 22:20 UTCJul 26, 00:25 UTC2h 5m
2026-07-25 UAL708 DEN → SFO Jul 25, 19:00 UTCJul 25, 20:25 UTC1h 25m
2026-07-25 UAL2159 DCA → IAH Jul 25, 16:05 UTCJul 25, 17:10 UTC1h 5m
2026-07-25 UAL1561 SFO → PDX Jul 25, 12:30 UTCJul 25, 14:05 UTC1h 35m
2026-07-25 UAL1561 SFO → PDX Jul 25, 12:29 UTCJul 25, 14:01 UTC1h 32m
2026-07-25 UAL696 RIC → DEN Jul 25, 02:15 UTCJul 25, 03:45 UTC1h 30m
2026-07-24 UAL1943 ORD → CHS Jul 24, 22:45 UTCJul 25, 00:05 UTC1h 20m
2026-07-24 UAL2327 ORD → SFO Jul 24, 20:05 UTCJul 24, 21:05 UTC1h 0m
2026-07-24 UAL347 PHL → DEN Jul 24, 16:15 UTCJul 24, 18:00 UTC1h 45m
2026-07-24 UAL719 MIA → EWR Jul 24, 02:08 UTCJul 24, 03:46 UTC1h 38m
2026-07-24 UAL719 MIA → EWR Jul 24, 02:00 UTCJul 24, 03:45 UTC1h 45m
2026-07-23 UAL2123 AUS → SFO Jul 23, 23:20 UTCJul 24, 00:40 UTC1h 20m
2026-07-23 UAL2123 AUS → SFO Jul 23, 23:15 UTCJul 24, 00:29 UTC1h 14m
2026-07-23 UAL586 DEN → MCI Jul 23, 20:20 UTCJul 23, 21:25 UTC1h 5m
2026-07-23 UAL1315 EWR → FLL Jul 23, 17:00 UTCJul 23, 18:20 UTC1h 20m
2026-07-23 UAL1315 EWR → FLL Jul 23, 16:55 UTCJul 23, 18:19 UTC1h 24m
2026-07-23 UAL1264 - Jul 23, 12:30 UTCJul 23, 15:00 UTC2h 30m
2026-07-22 UAL2217 ORD → PIT Jul 22, 22:23 UTCJul 23, 01:50 UTC3h 27m
2026-07-22 UAL2217 ORD → PIT Jul 22, 23:10 UTCJul 23, 01:50 UTC2h 40m
2026-07-22 UAL2366 SFO → LAS Jul 22, 17:35 UTCJul 22, 20:10 UTC2h 35m
2026-07-22 UAL722 - Jul 22, 13:10 UTCJul 22, 15:25 UTC2h 15m
2026-07-22 UAL1374 DEN → ORF Jul 22, 00:10 UTCJul 22, 03:40 UTC3h 30m
2026-07-21 UAL1728 SFO → IAH Jul 21, 18:00 UTCJul 21, 22:30 UTC4h 30m
2026-07-21 UAL1727 LAS → SFO Jul 21, 13:15 UTCJul 21, 16:40 UTC3h 25m
2026-07-21 UAL248 BOS → IAH Jul 21, 00:15 UTCJul 21, 03:10 UTC2h 55m
2026-07-20 UAL2155 - Jul 20, 20:55 UTCJul 20, 22:15 UTC1h 20m
2026-07-20 UAL2383 PHL → DEN Jul 20, 18:10 UTCJul 20, 19:10 UTC1h 0m
2026-07-20 UAL2853 DEN → EWR Jul 20, 14:45 UTCJul 20, 16:35 UTC1h 50m
2026-07-20 UAL2819 DEN → SAT Jul 20, 00:25 UTCJul 20, 02:10 UTC1h 45m
2026-07-19 UAL1534 EWR → FLL Jul 19, 21:00 UTCJul 19, 22:50 UTC1h 50m
2026-07-19 UAL2167 - Jul 19, 17:35 UTCJul 19, 19:20 UTC1h 45m
2026-07-19 UAL2853 - Jul 19, 14:05 UTCJul 19, 15:50 UTC1h 45m
2026-07-19 UAL2819 DEN → SAT Jul 19, 00:05 UTCJul 19, 01:55 UTC1h 50m
2026-07-18 UAL2754 - Jul 18, 12:55 UTCJul 18, 15:00 UTC2h 5m
2026-07-18 UAL1371 SNA → ORD Jul 18, 03:30 UTCJul 18, 05:40 UTC2h 10m
2026-07-18 UAL1483 STL → DEN Jul 18, 00:04 UTCJul 18, 01:45 UTC1h 40m
2026-07-17 UAL2000 ORD → STL Jul 17, 22:15 UTCJul 17, 22:55 UTC40m
2026-07-17 UAL714 - Jul 17, 17:44 UTCJul 17, 19:35 UTC1h 50m
2026-07-17 UAL709 - Jul 17, 15:00 UTCJul 17, 16:34 UTC1h 35m
2026-07-16 UAL343 BNA → ORD Jul 16, 15:55 UTCJul 16, 17:20 UTC1h 25m
2026-07-16 UAL343 BNA → ORD Jul 16, 15:46 UTCJul 16, 17:01 UTC1h 15m
2026-07-16 UAL2175 ORD → BNA Jul 16, 12:55 UTCJul 16, 13:54 UTC1h 0m
2026-07-16 UAL2175 ORD → BNA Jul 16, 12:43 UTCJul 16, 13:51 UTC1h 8m
2026-07-15 UAL1504 - Jul 15, 21:35 UTCJul 15, 22:00 UTC25m
2026-07-15 UAL1504 LGA → ORD Jul 15, 19:45 UTCJul 15, 22:00 UTC2h 15m
2026-07-15 UAL1504 LGA → ORD Jul 15, 19:44 UTCJul 15, 21:20 UTC1h 36m
2026-07-15 UAL1775 - Jul 15, 16:25 UTCJul 15, 18:05 UTC1h 40m
2026-07-15 UAL623 LGA → ORD Jul 15, 12:56 UTCJul 15, 14:41 UTC1h 45m

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 N16234 page for operator, model, and routing details .

Mode-S A0FBFA frequently asked

What is Mode-S code A0FBFA?
A0FBFA is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N16234.
Where is Mode-S A0FBFA registered?
Mode-S code A0FBFA 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 A0FBFA broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:30 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A0FBFA, octal 50175772, decimal 10,550,266.
What flights does A0FBFA operate?
Mode-S A0FBFA has broadcast 20 distinct callsigns, including UAL2000, UAL1504, UAL586, UAL532, UAL493.