Apparatus

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sensors Mode-S transponder

A5B1A8

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N466UA · AIRBUS A-320 · operated by UNITED AIRLINES INC

Hex
A5B1A8
Octal
51330650
Decimal
10,858,920
Country
US
Tail
N466UA
Type
A320
No current signal · last broadcast Jul 26, 21:10 UTC
Flights observed
473
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:10 UTC

Last known position

Most recent position reported by Mode-S A5B1A8.

Country allocation

The ICAO 24-bit address A5B1A8 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
UAL355 - 8 2026-07-12
UAL1604 United Airlines 6 2026-07-01
UAL671 United Airlines 5 2026-07-24
UAL2193 - 5 2026-07-01
UAL1857 United Airlines 5 2026-07-23
UAL1842 United Airlines 5 2026-07-23
UAL1766 - 5 2026-07-01
UAL1625 United Airlines 5 2026-06-12
UAL779 United Airlines 4 2026-04-16
UAL578 United Airlines 4 2026-04-17
UAL2159 United Airlines 4 2026-04-22
UAL2082 - 4 2026-06-24
UAL1878 United Airlines 4 2026-05-08
UAL1762 United Airlines 4 2026-07-23
UAL1564 United Airlines 4 2026-07-25
UAL1485 United Airlines 4 2026-04-27
UAL1436 - 4 2026-07-01
UAL1322 - 4 2026-07-13
UAL1061 United Airlines 4 2026-06-12
UAL8102 United Airlines 3 2026-07-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL2298 SFO → PHX Jul 26, 20:05 UTCJul 26, 21:05 UTC1h 0m
2026-07-26 UAL1215 EWR → SRQ Jul 26, 15:44 UTCJul 26, 17:26 UTC1h 42m
2026-07-26 UAL1215 EWR → SRQ Jul 26, 15:45 UTCJul 26, 17:50 UTC2h 5m
2026-07-26 UAL2622 LAX → ORD Jul 26, 12:20 UTCJul 26, 13:55 UTC1h 35m
2026-07-26 UAL2622 LAX → ORD Jul 26, 12:33 UTCJul 26, 14:00 UTC1h 27m
2026-07-25 UAL1564 BOS → ORD Jul 25, 22:55 UTCJul 26, 00:55 UTC2h 0m
2026-07-25 UAL1062 DEN → SFO Jul 25, 16:20 UTCJul 25, 19:25 UTC3h 5m
2026-07-25 UAL335 DEN → IAD Jul 25, 13:15 UTCJul 25, 14:35 UTC1h 20m
2026-07-25 UAL8190 ORD → SFO Jul 25, 05:10 UTCJul 25, 06:10 UTC1h 0m
2026-07-25 UAL8190 ORD → SFO Jul 25, 05:17 UTCJul 25, 06:10 UTC53m
2026-07-25 UAL1508 IAD → EWR Jul 25, 03:15 UTCJul 25, 04:10 UTC55m
2026-07-25 UAL2764 IAD → EWR Jul 25, 01:05 UTCJul 25, 02:00 UTC55m
2026-07-25 UAL2764 IAD → EWR Jul 25, 00:36 UTCJul 25, 01:57 UTC1h 21m
2026-07-24 UAL2305 RSW → ORD Jul 24, 22:05 UTCJul 24, 22:50 UTC45m
2026-07-24 UAL671 DEN → BZN Jul 24, 18:10 UTCJul 24, 20:10 UTC2h 0m
2026-07-24 UAL255 ATL → EWR Jul 24, 14:40 UTCJul 24, 16:40 UTC2h 0m
2026-07-24 UAL255 ATL → EWR Jul 24, 13:45 UTCJul 24, 16:37 UTC2h 52m
2026-07-24 UAL1204 DEN → SJC Jul 24, 00:30 UTCJul 24, 02:20 UTC1h 50m
2026-07-23 UAL1762 SDF → DEN Jul 23, 19:35 UTCJul 23, 22:40 UTC3h 5m
2026-07-23 UAL1762 SDF → DEN Jul 23, 19:35 UTCJul 23, 22:35 UTC3h 0m
2026-07-23 UAL2427 ORD → SXM Jul 23, 15:55 UTCJul 23, 17:45 UTC1h 50m
2026-07-23 UAL1857 BWI → ORD Jul 23, 12:55 UTCJul 23, 14:00 UTC1h 5m
2026-07-23 UAL1857 BWI → ORD Jul 23, 12:56 UTCJul 23, 13:49 UTC53m
2026-07-23 UAL1842 IAD → DEN Jul 23, 03:03 UTCJul 23, 04:02 UTC59m
2026-07-23 UAL1842 IAD → DEN Jul 23, 02:55 UTCJul 23, 04:05 UTC1h 10m
2026-07-22 UAL2770 MSY → ORD Jul 22, 22:55 UTCJul 22, 23:50 UTC55m
2026-07-22 UAL1634 - Jul 22, 19:35 UTCJul 22, 20:40 UTC1h 5m
2026-07-22 UAL1114 DFW → ORD Jul 22, 15:00 UTCJul 22, 16:50 UTC1h 50m
2026-07-22 UAL1673 CLE → ORD Jul 22, 01:50 UTCJul 22, 03:35 UTC1h 45m
2026-07-21 UAL2211 ORD → SFO Jul 21, 21:05 UTCJul 21, 23:35 UTC2h 30m
2026-07-21 UAL2427 ORD → SXM Jul 21, 16:05 UTCJul 21, 17:55 UTC1h 50m
2026-07-21 UAL466 AUS → EWR Jul 21, 13:20 UTCJul 21, 14:25 UTC1h 5m
2026-07-21 UAL1492 PHL → IAH Jul 21, 03:25 UTCJul 21, 04:15 UTC50m
2026-07-20 UAL1084 - Jul 20, 23:50 UTCJul 21, 01:15 UTC1h 25m
2026-07-20 UAL1934 - Jul 20, 19:55 UTCJul 20, 22:20 UTC2h 25m
2026-07-20 UAL8102 YYZ → YQB Jul 20, 16:25 UTCJul 20, 17:55 UTC1h 30m
2026-07-20 UAL2174 - Jul 20, 13:00 UTCJul 20, 14:35 UTC1h 35m
2026-07-20 UAL2174 IAH → BNA Jul 20, 12:59 UTCJul 20, 14:36 UTC1h 37m
2026-07-20 UAL1966 AUS → IAH Jul 20, 10:40 UTCJul 20, 11:10 UTC30m
2026-07-20 UAL2674 - Jul 20, 00:10 UTCJul 20, 00:35 UTC25m
2026-07-19 UAL1838 MEX → IAH Jul 19, 20:35 UTCJul 19, 22:25 UTC1h 50m
2026-07-19 UAL1088 - Jul 19, 17:10 UTCJul 19, 18:00 UTC50m
2026-07-19 UAL1088 IAH → MEX Jul 19, 17:09 UTCJul 19, 18:56 UTC1h 47m
2026-07-19 UAL2662 - Jul 19, 13:10 UTCJul 19, 15:00 UTC1h 50m
2026-07-19 UAL1216 - Jul 19, 01:55 UTCJul 19, 03:40 UTC1h 45m
2026-07-19 UAL1216 IAH → OMA Jul 19, 01:56 UTCJul 19, 03:36 UTC1h 40m
2026-07-18 UAL738 - Jul 18, 22:05 UTCJul 19, 00:00 UTC1h 55m
2026-07-18 UAL2364 - Jul 18, 17:45 UTCJul 18, 19:40 UTC1h 55m
2026-07-18 UAL2196 - Jul 18, 15:00 UTCJul 18, 15:35 UTC35m
2026-07-18 UAL2016 IAH → AUS Jul 18, 13:25 UTCJul 18, 13:55 UTC30m

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 N466UA page for operator, model, and routing details .

Mode-S A5B1A8 frequently asked

What is Mode-S code A5B1A8?
A5B1A8 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N466UA.
Where is Mode-S A5B1A8 registered?
Mode-S code A5B1A8 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 A5B1A8 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:10 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A5B1A8, octal 51330650, decimal 10,858,920.
What flights does A5B1A8 operate?
Mode-S A5B1A8 has broadcast 20 distinct callsigns, including UAL355, UAL1604, UAL671, UAL2193, UAL1857.