Apparatus

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sensors Mode-S transponder

A8B5FC

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N660UA · BOEING 767-300 · operated by UNITED AIRLINES INC

Hex
A8B5FC
Octal
52132774
Decimal
11,056,636
Country
US
Tail
N660UA
Type
B763
Broadcasting now · callsign UAL126 · 35,000 ft
Flights observed
197
Distinct callsigns
20
Country
US
Last broadcast
9d ago

Current position

A8B5FC is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A8B5FC 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
UAL128 United Airlines 21 2026-07-24
UAL854 United Airlines 19 2026-07-25
UAL331 United Airlines 17 2026-07-20
UAL129 United Airlines 15 2026-07-23
UAL330 United Airlines 14 2026-07-20
UAL21 - 13 2026-07-21
UAL855 United Airlines 12 2026-07-26
UAL52 - 12 2026-07-11
UAL53 - 11 2026-07-12
UAL20 - 11 2026-07-08
UAL947 - 9 2026-07-09
UAL946 United Airlines 9 2026-07-21
UAL322 United Airlines 8 2026-07-19
UAL321 - 7 2026-07-19
UAL8223 United Airlines 4 2026-04-18
UAL242 United Airlines 3 2026-06-16
UAL748 - 2 2026-06-15
UAL3912 United Airlines 2 2026-05-27
UAL925 United Airlines 1 2026-05-07
UAL924 United Airlines 1 2026-05-07

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL855 LIM → IAH Jul 26, 06:40 UTCJul 26, 12:10 UTC5h 30m
2026-07-25 UAL854 IAH → LIM Jul 25, 21:40 UTCJul 26, 03:25 UTC5h 45m
2026-07-25 UAL854 IAH → LIM Jul 25, 21:42 UTCJul 26, 03:45 UTC6h 3m
2026-07-25 UAL855 LIM → IAH Jul 25, 06:40 UTCJul 25, 12:20 UTC5h 40m
2026-07-24 UAL854 IAH → LIM Jul 24, 22:00 UTCJul 25, 00:35 UTC2h 35m
2026-07-24 UAL854 IAH → LIM Jul 24, 21:57 UTCJul 25, 04:11 UTC6h 14m
2026-07-24 UAL128 GIG → IAH Jul 24, 04:45 UTCJul 24, 10:10 UTC5h 25m
2026-07-23 UAL129 IAH → GIG Jul 23, 01:45 UTCJul 23, 11:40 UTC9h 55m
2026-07-21 UAL21 - Jul 21, 14:35 UTCJul 22, 00:25 UTC9h 50m
2026-07-21 UAL946 IAD → AMS Jul 21, 03:20 UTCJul 21, 10:35 UTC7h 15m
2026-07-20 UAL331 CDG → IAD Jul 20, 15:20 UTCJul 20, 23:00 UTC7h 40m
2026-07-20 UAL330 SFO → LAX Jul 20, 03:35 UTCJul 20, 10:45 UTC7h 10m
2026-07-19 UAL322 BOI → DEN Jul 19, 10:55 UTCJul 19, 19:00 UTC8h 5m
2026-07-19 UAL322 BOI → DEN Jul 19, 10:59 UTCJul 19, 20:02 UTC9h 3m
2026-07-19 UAL321 - Jul 19, 00:10 UTCJul 19, 08:25 UTC8h 15m
2026-07-16 UAL331 - Jul 16, 15:14 UTCJul 16, 23:15 UTC8h 0m
2026-07-16 UAL330 - Jul 16, 03:10 UTCJul 16, 10:40 UTC7h 30m
2026-07-15 UAL331 - Jul 15, 15:15 UTCJul 15, 23:20 UTC8h 5m
2026-07-15 UAL331 CDG → IAD Jul 15, 15:24 UTCJul 15, 23:19 UTC7h 55m
2026-07-15 UAL330 IAD → CDG Jul 15, 03:35 UTCJul 15, 10:50 UTC7h 15m
2026-07-14 UAL331 - Jul 14, 15:10 UTCJul 14, 23:05 UTC7h 54m
2026-07-14 UAL330 IAD → CDG Jul 14, 03:25 UTCJul 14, 10:35 UTC7h 10m
2026-07-13 UAL331 - Jul 13, 15:30 UTCJul 13, 23:25 UTC7h 55m
2026-07-13 UAL331 CDG → IAD Jul 13, 15:24 UTCJul 13, 23:21 UTC7h 57m
2026-07-13 UAL330 IAD → CDG Jul 13, 03:10 UTCJul 13, 10:30 UTC7h 20m
2026-07-12 UAL53 ZRH → IAD Jul 12, 10:30 UTCJul 12, 19:05 UTC8h 35m
2026-07-11 UAL52 IAD → ZRH Jul 11, 22:35 UTCJul 12, 06:01 UTC7h 25m
2026-07-11 UAL53 ZRH → IAD Jul 11, 10:30 UTCJul 11, 19:20 UTC8h 50m
2026-07-10 UAL52 IAD → ZRH Jul 10, 22:03 UTCJul 11, 06:01 UTC7h 58m
2026-07-10 UAL52 IAD → ZRH Jul 10, 22:25 UTCJul 11, 05:55 UTC7h 30m
2026-07-10 UAL53 ZRH → IAD Jul 10, 10:45 UTCJul 10, 20:00 UTC9h 15m
2026-07-09 UAL52 - Jul 9, 23:30 UTCJul 10, 07:20 UTC7h 50m
2026-07-09 UAL947 - Jul 9, 09:25 UTCJul 9, 11:00 UTC1h 35m
2026-07-09 UAL947 AMS → IAD Jul 9, 09:35 UTCJul 9, 17:35 UTC8h 0m
2026-07-09 UAL947 AMS → IAD Jul 9, 09:35 UTCJul 9, 17:42 UTC8h 7m
2026-07-08 UAL20 - Jul 8, 21:50 UTCJul 9, 07:10 UTC9h 20m
2026-07-08 UAL20 IAH → AMS Jul 8, 21:47 UTCJul 9, 06:57 UTC9h 10m
2026-07-08 UAL128 - Jul 8, 00:20 UTCJul 8, 10:05 UTC9h 45m
2026-07-07 UAL129 - Jul 7, 03:05 UTCJul 7, 12:45 UTC9h 40m
2026-07-05 UAL21 AMS → IAH Jul 5, 09:30 UTCJul 5, 19:35 UTC10h 5m
2026-07-04 UAL20 - Jul 4, 22:20 UTCJul 5, 07:25 UTC9h 5m
2026-07-02 UAL21 AMS → IAH Jul 2, 09:40 UTCJul 2, 20:15 UTC10h 35m
2026-07-02 UAL21 AMS → IAH Jul 2, 09:30 UTCJul 2, 20:10 UTC10h 40m
2026-07-01 UAL946 - Jul 1, 21:55 UTCJul 2, 05:10 UTC7h 15m
2026-06-30 UAL331 - Jun 30, 15:10 UTCJun 30, 23:10 UTC8h 0m
2026-06-30 UAL331 CDG → IAD Jun 30, 15:24 UTCJun 30, 23:08 UTC7h 44m
2026-06-30 UAL330 IAD → CDG Jun 30, 03:05 UTCJun 30, 10:20 UTC7h 15m
2026-06-29 UAL331 - Jun 29, 15:14 UTCJun 29, 23:19 UTC8h 5m
2026-06-29 UAL330 IAD → CDG Jun 29, 03:14 UTCJun 29, 10:29 UTC7h 15m
2026-06-28 UAL331 - Jun 28, 15:24 UTCJun 28, 23:50 UTC8h 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 N660UA page for operator, model, and routing details .

Mode-S A8B5FC frequently asked

What is Mode-S code A8B5FC?
A8B5FC is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N660UA.
Where is Mode-S A8B5FC registered?
Mode-S code A8B5FC 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 A8B5FC broadcasting right now?
Yes. Mode-S A8B5FC is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A8B5FC, octal 52132774, decimal 11,056,636.
What flights does A8B5FC operate?
Mode-S A8B5FC has broadcast 20 distinct callsigns, including UAL128, UAL854, UAL331, UAL129, UAL330.