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
Broadcasting now · callsign UAL1028 · 32,000 ft
Flights observed
507
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:00 UTC

Current position

AB9078 is currently broadcasting. Map zoomed to live position.

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
UAL1608 United Airlines 6 2026-07-19
UAL1531 - 6 2026-07-17
UAL412 - 5 2026-07-12
UAL2795 - 5 2026-06-20
UAL1712 United Airlines 5 2026-05-14
UAL696 United Airlines 4 2026-07-21
UAL543 United Airlines 4 2026-07-24
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
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

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL1863 PUJ → ORD Jul 26, 21:35 UTCJul 26, 22:00 UTC25m
2026-07-26 UAL1642 EWR → RSW Jul 26, 16:15 UTCJul 26, 20:10 UTC3h 55m
2026-07-26 UAL2718 PDX → SFO Jul 26, 13:40 UTCJul 26, 14:25 UTC45m
2026-07-26 UAL1334 EWR → PBI Jul 26, 04:05 UTCJul 26, 04:50 UTC45m
2026-07-25 UAL436 SFO → BWI Jul 25, 21:35 UTCJul 26, 02:50 UTC5h 15m
2026-07-25 UAL2836 SFO → PIT Jul 25, 15:45 UTCJul 25, 20:00 UTC4h 15m
2026-07-25 UAL2718 PDX → SFO Jul 25, 13:40 UTCJul 25, 14:20 UTC40m
2026-07-25 UAL1334 EWR → PBI Jul 25, 07:45 UTCJul 25, 08:30 UTC45m
2026-07-25 UAL436 SFO → BWI Jul 25, 00:55 UTCJul 25, 06:15 UTC5h 20m
2026-07-24 UAL2836 SFO → PIT Jul 24, 15:55 UTCJul 24, 20:15 UTC4h 20m
2026-07-24 UAL2097 SFO → EWR Jul 24, 05:10 UTCJul 24, 06:50 UTC1h 40m
2026-07-24 UAL543 IAH → MCO Jul 24, 01:35 UTCJul 24, 02:55 UTC1h 20m
2026-07-23 UAL2279 EWR → MSY Jul 23, 22:10 UTCJul 23, 23:50 UTC1h 40m
2026-07-23 UAL1301 CLT → ORD Jul 23, 18:30 UTCJul 23, 19:40 UTC1h 10m
2026-07-23 UAL2718 PDX → SFO Jul 23, 14:15 UTCJul 23, 14:50 UTC35m
2026-07-23 UAL1334 EWR → PBI Jul 23, 06:30 UTCJul 23, 07:10 UTC40m
2026-07-23 UAL2097 SFO → EWR Jul 23, 03:35 UTCJul 23, 05:10 UTC1h 35m
2026-07-23 UAL543 IAH → MCO Jul 23, 00:50 UTCJul 23, 02:15 UTC1h 25m
2026-07-23 UAL543 IAH → MCO Jul 23, 01:01 UTCJul 23, 02:11 UTC1h 10m
2026-07-22 UAL1453 SJD → IAH Jul 22, 22:40 UTCJul 22, 23:35 UTC55m
2026-07-22 UAL2154 ORD → TPA Jul 22, 17:30 UTCJul 22, 19:25 UTC1h 55m
2026-07-22 UAL1376 RDU → EWR Jul 22, 13:35 UTCJul 22, 15:50 UTC2h 15m
2026-07-22 UAL1376 RDU → EWR Jul 22, 13:15 UTCJul 22, 15:49 UTC2h 34m
2026-07-22 UAL1541 IAH → LGA Jul 22, 00:40 UTCJul 22, 02:55 UTC2h 15m
2026-07-21 UAL696 RIC → DEN Jul 21, 19:45 UTCJul 21, 21:50 UTC2h 5m
2026-07-21 UAL1836 SEA → SFO Jul 21, 16:15 UTCJul 21, 18:00 UTC1h 45m
2026-07-21 UAL1836 SEA → SFO Jul 21, 16:18 UTCJul 21, 18:07 UTC1h 49m
2026-07-20 UAL2325 ORD → PHL Jul 20, 19:45 UTCJul 20, 22:00 UTC2h 15m
2026-07-20 UAL2273 DTW → IAH Jul 20, 16:15 UTCJul 20, 18:30 UTC2h 15m
2026-07-20 UAL225 - Jul 20, 12:40 UTCJul 20, 14:30 UTC1h 50m
2026-07-20 UAL225 RNO → DEN Jul 20, 12:43 UTCJul 20, 14:26 UTC1h 43m
2026-07-20 UAL2852 EWR → DEN Jul 20, 04:17 UTCJul 20, 05:59 UTC1h 42m
2026-07-20 UAL2852 EWR → DEN Jul 20, 04:15 UTCJul 20, 06:00 UTC1h 45m
2026-07-20 UAL1268 BNA → DEN Jul 20, 00:55 UTCJul 20, 03:05 UTC2h 10m
2026-07-19 UAL1608 MSN → DEN Jul 19, 21:01 UTCJul 19, 22:43 UTC1h 42m
2026-07-19 UAL1608 MSN → DEN Jul 19, 20:45 UTCJul 19, 22:35 UTC1h 50m
2026-07-19 UAL1435 - Jul 19, 15:25 UTCJul 19, 19:40 UTC4h 15m
2026-07-19 UAL1435 AUS → EWR Jul 19, 15:24 UTCJul 19, 19:36 UTC4h 12m
2026-07-19 UAL2035 LAX → SFO Jul 19, 10:20 UTCJul 19, 13:40 UTC3h 20m
2026-07-18 UAL1797 IAH → EWR Jul 18, 19:37 UTCJul 19, 01:33 UTC5h 56m
2026-07-18 UAL2690 - Jul 18, 13:30 UTCJul 18, 15:15 UTC1h 45m
2026-07-18 UAL2784 ORD → BNA Jul 18, 01:18 UTCJul 18, 02:16 UTC58m
2026-07-18 UAL2784 ORD → BNA Jul 18, 01:15 UTCJul 18, 02:14 UTC1h 0m
2026-07-17 UAL1531 MSP → ORD Jul 17, 22:45 UTCJul 17, 23:55 UTC1h 10m
2026-07-17 UAL2749 ORD → MSP Jul 17, 18:05 UTCJul 17, 19:00 UTC55m
2026-07-17 UAL705 - Jul 17, 15:05 UTCJul 17, 16:19 UTC1h 15m
2026-07-17 UAL2753 - Jul 17, 12:55 UTCJul 17, 14:00 UTC1h 5m
2026-07-16 UAL1193 DCA → ORD Jul 16, 23:29 UTCJul 17, 01:20 UTC1h 50m
2026-07-16 UAL1941 - Jul 16, 20:35 UTCJul 16, 22:10 UTC1h 35m
2026-07-16 UAL1941 ORD → DCA Jul 16, 20:36 UTCJul 16, 22:03 UTC1h 27m

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?
Yes. Mode-S AB9078 is currently airborne.
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 UAL1608, UAL1531, UAL412, UAL2795, UAL1712.