Apparatus

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sensors Mode-S transponder

A0B7FB

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N14521 · operated by UNITED AIRLINES INC

Hex
A0B7FB
Octal
50133773
Decimal
10,532,859
Country
US
Tail
N14521
Type
A21N
No current signal · last broadcast 2h ago
Flights observed
347
Distinct callsigns
20
Country
US
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S A0B7FB.

Country allocation

The ICAO 24-bit address A0B7FB 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
UAL353 United Airlines 7 2026-06-03
UAL2361 United Airlines 7 2026-06-09
UAL1356 - 7 2026-06-23
UAL1023 - 6 2026-06-20
UAL747 United Airlines 5 2026-05-17
UAL414 United Airlines 5 2026-05-15
UAL1779 - 5 2026-06-13
UAL475 - 4 2026-06-16
UAL405 United Airlines 4 2026-06-11
UAL360 - 4 2026-06-11
UAL2213 United Airlines 4 2026-05-15
UAL2113 United Airlines 4 2026-05-01
UAL2061 United Airlines 4 2026-06-09
UAL2033 - 4 2026-06-12
UAL1865 United Airlines 4 2026-06-10
UAL1834 United Airlines 4 2026-05-06
UAL1755 - 4 2026-07-10
UAL1752 United Airlines 4 2026-05-11
UAL1568 United Airlines 4 2026-05-29
UAL1132 - 4 2026-06-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 UAL2088 - Jul 13, 21:55 UTCJul 14, 02:20 UTC4h 25m
2026-07-13 UAL1996 - Jul 13, 16:15 UTCJul 13, 18:00 UTC1h 45m
2026-07-13 UAL1996 ORD → SJU Jul 13, 16:15 UTCJul 13, 20:30 UTC4h 15m
2026-07-12 UAL2306 - Jul 12, 14:05 UTCJul 12, 17:30 UTC3h 25m
2026-07-11 UAL1677 - Jul 11, 22:01 UTCJul 12, 01:45 UTC3h 45m
2026-07-11 UAL587 - Jul 11, 15:25 UTCJul 11, 18:55 UTC3h 30m
2026-07-10 UAL1107 - Jul 10, 22:00 UTCJul 11, 01:45 UTC3h 45m
2026-07-10 UAL1107 ORD → SNA Jul 10, 21:53 UTCJul 11, 01:37 UTC3h 44m
2026-07-10 UAL1755 - Jul 10, 16:50 UTCJul 10, 19:45 UTC2h 55m
2026-07-10 UAL1421 - Jul 10, 12:45 UTCJul 10, 15:20 UTC2h 35m
2026-07-10 UAL787 - Jul 10, 06:00 UTCJul 10, 06:15 UTC15m
2026-07-10 UAL787 - Jul 10, 02:00 UTCJul 10, 05:00 UTC3h 0m
2026-07-09 UAL714 - Jul 9, 22:00 UTCJul 10, 00:10 UTC2h 10m
2026-07-09 UAL1755 - Jul 9, 19:20 UTCJul 9, 19:45 UTC25m
2026-07-09 UAL1755 - Jul 9, 16:35 UTCJul 9, 19:45 UTC3h 10m
2026-07-09 UAL1755 FLL → ORD Jul 9, 16:44 UTCJul 9, 19:01 UTC2h 17m
2026-07-09 UAL1421 - Jul 9, 12:30 UTCJul 9, 15:05 UTC2h 35m
2026-07-08 UAL706 LAS → ORD Jul 8, 21:30 UTCJul 9, 00:50 UTC3h 20m
2026-07-08 UAL2440 - Jul 8, 16:20 UTCJul 8, 19:35 UTC3h 15m
2026-07-08 UAL1775 IAD → ORD Jul 8, 12:50 UTCJul 8, 14:10 UTC1h 20m
2026-07-08 UAL3887 - Jul 8, 08:15 UTCJul 8, 09:35 UTC1h 20m
2026-07-08 UAL3887 LCQ → IAD Jul 8, 07:58 UTCJul 8, 09:39 UTC1h 41m
2026-06-26 UAL3898 - Jun 26, 05:19 UTCJun 26, 07:05 UTC1h 45m
2026-06-26 UAL3898 ORD → LCQ Jun 26, 04:00 UTCJun 26, 07:05 UTC3h 5m
2026-06-25 UAL258K - Jun 25, 07:00 UTCJun 25, 07:09 UTC10m
2026-06-25 UAL258K DEN → ORD Jun 25, 04:45 UTCJun 25, 07:09 UTC2h 25m
2026-06-25 UAL258K DEN → ORD Jun 25, 04:25 UTCJun 25, 06:41 UTC2h 16m
2026-06-24 UAL1132 CUN → DEN Jun 24, 19:10 UTCJun 24, 22:49 UTC3h 40m
2026-06-24 UAL1119 DEN → CUN Jun 24, 14:04 UTCJun 24, 17:34 UTC3h 30m
2026-06-23 UAL1974 - Jun 23, 23:59 UTCJun 24, 02:15 UTC2h 15m
2026-06-23 UAL617 DEN → ORD Jun 23, 19:50 UTCJun 23, 21:45 UTC1h 55m
2026-06-23 UAL662 - Jun 23, 13:50 UTCJun 23, 17:59 UTC4h 10m
2026-06-23 UAL1356 DEN → BOS Jun 23, 00:35 UTCJun 23, 04:00 UTC3h 25m
2026-06-23 UAL1356 DEN → BOS Jun 23, 00:23 UTCJun 23, 03:58 UTC3h 35m
2026-06-22 UAL1411 PDX → DEN Jun 22, 20:00 UTCJun 22, 22:05 UTC2h 5m
2026-06-22 UAL1994 SFO → PDX Jun 22, 14:19 UTCJun 22, 18:15 UTC3h 55m
2026-06-22 UAL530 EWR → ORD Jun 22, 10:19 UTCJun 22, 12:19 UTC2h 0m
2026-06-22 UAL1209 EWR → ATL Jun 22, 03:30 UTCJun 22, 04:59 UTC1h 30m
2026-06-21 UAL2135 - Jun 21, 22:40 UTCJun 22, 00:50 UTC2h 10m
2026-06-21 UAL2821 HNL → EWR Jun 21, 18:04 UTCJun 21, 20:24 UTC2h 20m
2026-06-21 UAL1928 DEN → ORD Jun 21, 13:59 UTCJun 21, 15:59 UTC2h 0m
2026-06-21 UAL329 ORD → DEN Jun 21, 01:35 UTCJun 21, 04:10 UTC2h 35m
2026-06-20 UAL1023 - Jun 20, 23:25 UTCJun 20, 23:45 UTC20m
2026-06-20 UAL1023 DEN → ORD Jun 20, 21:25 UTCJun 20, 23:08 UTC1h 43m
2026-06-20 UAL2843 - Jun 20, 17:34 UTCJun 20, 19:19 UTC1h 45m
2026-06-20 UAL2666 ORD → DEN Jun 20, 14:14 UTCJun 20, 16:19 UTC2h 5m
2026-06-20 UAL2339 LAS → LAX Jun 20, 07:49 UTCJun 20, 09:54 UTC2h 5m
2026-06-16 UAL2224 - Jun 16, 22:50 UTCJun 16, 23:45 UTC55m
2026-06-16 UAL686 EWR → IAD Jun 16, 20:55 UTCJun 16, 21:40 UTC45m
2026-06-16 UAL475 - Jun 16, 02:34 UTCJun 16, 04:25 UTC1h 50m

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 N14521 page for operator, model, and routing details .

Mode-S A0B7FB frequently asked

What is Mode-S code A0B7FB?
A0B7FB is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N14521.
Where is Mode-S A0B7FB registered?
Mode-S code A0B7FB 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 A0B7FB 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 A0B7FB, octal 50133773, decimal 10,532,859.
What flights does A0B7FB operate?
Mode-S A0B7FB has broadcast 20 distinct callsigns, including UAL353, UAL2361, UAL1356, UAL1023, UAL747.