Apparatus

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sensors Mode-S transponder

AB9078

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N844UA · AIRBUS A-319 · operated by UNITED AIRLINES INC

Hex
AB9078
Octal
52710170
Decimal
11,243,640
Country
US
Tail
N844UA
Type
A319
No current signal · last broadcast 5h ago
Flights observed
445
Distinct callsigns
20
Country
US
Last broadcast
5h ago

Last known position

Most recent position reported by Mode-S AB9078.

Country allocation

The ICAO 24-bit address AB9078 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
UAL412 - 5 2026-07-12
UAL2795 - 5 2026-06-20
UAL1712 United Airlines 5 2026-05-14
UAL2809 United Airlines 4 2026-06-12
UAL247 United Airlines 4 2026-04-23
UAL2364 - 4 2026-06-28
UAL2213 United Airlines 4 2026-05-19
UAL2144 - 4 2026-06-24
UAL1920 - 4 2026-06-17
UAL1839 United Airlines 4 2026-05-16
UAL1608 - 4 2026-06-25
UAL1531 - 4 2026-06-21
UAL1521 - 4 2026-07-05
UAL1510 - 4 2026-07-09
UAL1502 United Airlines 4 2026-05-15
UAL1479 - 4 2026-07-08
UAL1314 - 4 2026-06-20
UAL1235 - 4 2026-07-10
UAL1028 United Airlines 4 2026-07-03
UAL738 - 3 2026-06-29

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 UAL1639 STL → ORD Jul 13, 23:15 UTCJul 14, 00:00 UTC45m
2026-07-13 UAL1639 STL → ORD Jul 13, 23:11 UTCJul 13, 23:48 UTC37m
2026-07-13 UAL1639 DEN → STL Jul 13, 19:55 UTCJul 13, 21:35 UTC1h 40m
2026-07-13 UAL1327 - Jul 13, 15:40 UTCJul 13, 18:15 UTC2h 35m
2026-07-13 UAL2739 IAD → ATL Jul 13, 12:45 UTCJul 13, 14:00 UTC1h 15m
2026-07-12 UAL1240 DFW → IAD Jul 12, 23:30 UTCJul 13, 01:55 UTC2h 25m
2026-07-12 UAL2842 SFO → DFW Jul 12, 17:51 UTCJul 12, 20:49 UTC2h 58m
2026-07-12 UAL2842 SFO → DFW Jul 12, 17:40 UTCJul 12, 20:55 UTC3h 15m
2026-07-12 UAL822 - Jul 12, 11:15 UTCJul 12, 15:05 UTC3h 50m
2026-07-12 UAL412 - Jul 12, 09:45 UTCJul 12, 09:50 UTC5m
2026-07-12 UAL412 SFO → MEX Jul 12, 06:03 UTCJul 12, 09:53 UTC3h 50m
2026-07-12 UAL412 - Jul 12, 05:55 UTCJul 12, 08:55 UTC3h 0m
2026-07-12 UAL1508 BUR → SFO Jul 12, 03:10 UTCJul 12, 04:01 UTC50m
2026-07-11 UAL2764 SFO → BUR Jul 11, 23:55 UTCJul 12, 00:45 UTC50m
2026-07-11 UAL1453 BUR → SFO Jul 11, 21:50 UTCJul 11, 22:50 UTC1h 0m
2026-07-11 UAL2154 DEN → BUR Jul 11, 17:25 UTCJul 11, 19:25 UTC2h 0m
2026-07-11 UAL340 ATL → DEN Jul 11, 12:55 UTCJul 11, 15:35 UTC2h 40m
2026-07-11 UAL1305 DEN → ATL Jul 11, 01:20 UTCJul 11, 03:50 UTC2h 30m
2026-07-10 UAL514 - Jul 10, 20:40 UTCJul 10, 22:20 UTC1h 40m
2026-07-10 UAL476 - Jul 10, 17:30 UTCJul 10, 18:50 UTC1h 20m
2026-07-10 UAL1235 - Jul 10, 13:05 UTCJul 10, 15:40 UTC2h 35m
2026-07-10 UAL1228 DEN → DAY Jul 10, 01:45 UTCJul 10, 04:15 UTC2h 30m
2026-07-09 UAL498 - Jul 9, 20:50 UTCJul 9, 23:30 UTC2h 40m
2026-07-09 UAL1112 DEN → MEM Jul 9, 17:27 UTCJul 9, 19:05 UTC1h 38m
2026-07-09 UAL1112 - Jul 9, 17:20 UTCJul 9, 19:05 UTC1h 45m
2026-07-09 UAL1081 - Jul 9, 14:20 UTCJul 9, 15:55 UTC1h 35m
2026-07-09 UAL1282 - Jul 9, 11:10 UTCJul 9, 12:35 UTC1h 25m
2026-07-09 UAL1510 - Jul 9, 02:50 UTCJul 9, 04:10 UTC1h 20m
2026-07-08 UAL1510 - Jul 8, 19:45 UTCJul 8, 22:55 UTC3h 10m
2026-07-08 UAL1479 DEN → SDF Jul 8, 16:00 UTCJul 8, 18:20 UTC2h 20m
2026-07-08 UAL393 BFL → DEN Jul 8, 12:15 UTCJul 8, 14:05 UTC1h 50m
2026-07-08 UAL8144 DEN → BFL Jul 8, 02:08 UTCJul 8, 03:58 UTC1h 50m
2026-07-08 UAL8144 DEN → BFL Jul 8, 02:05 UTCJul 8, 04:05 UTC2h 0m
2026-07-07 UAL568 YYZ → DEN Jul 7, 20:59 UTCJul 8, 00:30 UTC3h 31m
2026-07-07 UAL568 - Jul 7, 21:00 UTCJul 8, 00:35 UTC3h 35m
2026-07-07 UAL1874 DEN → YYZ Jul 7, 16:20 UTCJul 7, 19:20 UTC3h 0m
2026-07-05 UAL514 - Jul 5, 21:00 UTCJul 5, 22:40 UTC1h 40m
2026-07-05 UAL476 DEN → CID Jul 5, 17:47 UTCJul 5, 19:27 UTC1h 40m
2026-07-05 UAL476 - Jul 5, 18:00 UTCJul 5, 19:30 UTC1h 30m
2026-07-05 UAL1521 - Jul 5, 14:40 UTCJul 5, 16:05 UTC1h 25m
2026-07-05 UAL1521 DSM → DEN Jul 5, 14:32 UTCJul 5, 15:56 UTC1h 24m
2026-07-04 UAL1311 DEN → DSM Jul 4, 20:14 UTCJul 4, 21:24 UTC1h 10m
2026-07-04 UAL2049 DFW → DEN Jul 4, 17:00 UTCJul 4, 18:45 UTC1h 45m
2026-07-04 UAL2160 PHX → SFO Jul 4, 14:00 UTCJul 4, 15:30 UTC1h 30m
2026-07-04 UAL439 AUS → DEN Jul 4, 00:49 UTCJul 4, 02:58 UTC2h 9m
2026-07-04 UAL439 AUS → DEN Jul 4, 01:05 UTCJul 4, 03:15 UTC2h 10m
2026-07-03 UAL1711 IAH → AUS Jul 3, 22:55 UTCJul 3, 23:25 UTC30m
2026-07-03 UAL1841 - Jul 3, 21:00 UTCJul 3, 21:35 UTC35m
2026-07-03 UAL755 - Jul 3, 19:25 UTCJul 3, 20:00 UTC35m
2026-07-03 UAL428 - Jul 3, 13:20 UTCJul 3, 15:05 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 N844UA page for operator, model, and routing details .

Mode-S AB9078 frequently asked

What is Mode-S code AB9078?
AB9078 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N844UA.
Where is Mode-S AB9078 registered?
Mode-S code AB9078 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 AB9078 broadcasting right now?
No active broadcast right now. Last signal was 5h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AB9078, octal 52710170, decimal 11,243,640.
What flights does AB9078 operate?
Mode-S AB9078 has broadcast 20 distinct callsigns, including UAL412, UAL2795, UAL1712, UAL2809, UAL247.