Apparatus

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sensors Mode-S transponder

AB28D7

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N818UA · AIRBUS A-319 · operated by UNITED AIRLINES INC

Hex
AB28D7
Octal
52624327
Decimal
11,217,111
Country
US
Tail
N818UA
Type
A319
No current signal · last broadcast Jul 26, 21:45 UTC
Flights observed
488
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:45 UTC

Last known position

Most recent position reported by Mode-S AB28D7.

Country allocation

The ICAO 24-bit address AB28D7 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
UAL581 - 7 2026-06-19
UAL1604 - 6 2026-07-13
UAL1510 United Airlines 6 2026-07-01
UAL1479 United Airlines 6 2026-07-01
UAL1235 - 6 2026-07-15
UAL792 - 5 2026-06-29
UAL652 - 5 2026-07-13
UAL2272 - 5 2026-07-12
UAL2211 - 5 2026-07-16
UAL1728 - 5 2026-06-29
UAL1282 - 5 2026-06-29
UAL2233 United Airlines 4 2026-07-25
UAL2198 United Airlines 4 2026-07-25
UAL1848 - 4 2026-07-10
UAL1451 - 4 2026-07-16
UAL1380 - 4 2026-07-13
UAL822 United Airlines 3 2026-04-14
UAL738 United Airlines 3 2026-07-26
UAL587 United Airlines 3 2026-07-22
UAL498 - 3 2026-06-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL738 CMH → DEN Jul 26, 21:25 UTCJul 26, 21:45 UTC20m
2026-07-26 UAL2364 LGA → ORD Jul 26, 17:55 UTCJul 26, 19:50 UTC1h 55m
2026-07-26 UAL1586 DEN → LGA Jul 26, 15:00 UTCJul 26, 15:45 UTC45m
2026-07-26 UAL358 SFO → LAS Jul 26, 12:40 UTCJul 26, 13:30 UTC50m
2026-07-26 UAL2744 MCO → EWR Jul 26, 10:20 UTCJul 26, 11:05 UTC45m
2026-07-26 UAL2140 SFO → IAH Jul 26, 00:00 UTCJul 26, 00:50 UTC50m
2026-07-25 UAL404 SFO → DEN Jul 25, 21:35 UTCJul 25, 22:15 UTC40m
2026-07-25 UAL515 JFK → LAX Jul 25, 16:35 UTCJul 25, 20:05 UTC3h 30m
2026-07-25 UAL2233 SNA → EWR Jul 25, 11:35 UTCJul 25, 15:05 UTC3h 30m
2026-07-25 UAL2233 SNA → EWR Jul 25, 11:39 UTCJul 25, 15:00 UTC3h 21m
2026-07-25 UAL2198 IAH → BDL Jul 25, 02:55 UTCJul 25, 03:30 UTC35m
2026-07-24 UAL2376 DEN → EWR Jul 24, 23:20 UTCJul 25, 01:05 UTC1h 45m
2026-07-24 UAL1211 DEN → PIT Jul 24, 20:40 UTCJul 24, 22:20 UTC1h 40m
2026-07-24 UAL1211 DEN → PIT Jul 24, 20:40 UTCJul 24, 22:17 UTC1h 37m
2026-07-24 UAL2472 IAH → DCA Jul 24, 15:00 UTCJul 24, 18:30 UTC3h 30m
2026-07-24 UAL738 CMH → DEN Jul 24, 01:30 UTCJul 24, 05:20 UTC3h 50m
2026-07-23 UAL738 CMH → DEN Jul 23, 21:20 UTCJul 23, 23:30 UTC2h 10m
2026-07-23 UAL2364 LGA → ORD Jul 23, 17:45 UTCJul 23, 19:40 UTC1h 55m
2026-07-23 UAL2364 LGA → ORD Jul 23, 17:46 UTCJul 23, 19:39 UTC1h 53m
2026-07-23 UAL2460 SAT → IAH Jul 23, 12:45 UTCJul 23, 15:05 UTC2h 20m
2026-07-23 UAL2378 SFO → BUR Jul 23, 02:00 UTCJul 23, 04:20 UTC2h 20m
2026-07-22 UAL1420 MCO → EWR Jul 22, 21:45 UTCJul 22, 23:40 UTC1h 55m
2026-07-22 UAL587 EWR → MSP Jul 22, 19:35 UTCJul 22, 20:05 UTC30m
2026-07-22 UAL2437 LGA → DEN Jul 22, 16:50 UTCJul 22, 17:55 UTC1h 5m
2026-07-22 UAL1484 LAX → SFO Jul 22, 13:55 UTCJul 22, 15:05 UTC1h 10m
2026-07-22 UAL2137 ORD → SLC Jul 22, 11:35 UTCJul 22, 12:05 UTC30m
2026-07-21 UAL1178 SMF → EWR Jul 21, 23:30 UTCJul 22, 00:00 UTC30m
2026-07-21 UAL1178 SMF → EWR Jul 21, 23:44 UTCJul 21, 23:57 UTC13m
2026-07-21 UAL516 SFO → LAX Jul 21, 19:55 UTCJul 21, 21:50 UTC1h 55m
2026-07-21 UAL471 IAD → BOS Jul 21, 16:55 UTCJul 21, 18:20 UTC1h 25m
2026-07-21 UAL1434 SFO → LAX Jul 21, 13:35 UTCJul 21, 15:10 UTC1h 35m
2026-07-20 UAL293 EWR → DFW Jul 20, 23:35 UTCJul 21, 01:10 UTC1h 35m
2026-07-20 UAL1831 RNO → SFO Jul 20, 19:10 UTCJul 20, 20:35 UTC1h 25m
2026-07-20 UAL2684 PHL → ORD Jul 20, 16:15 UTCJul 20, 17:40 UTC1h 25m
2026-07-20 UAL247 DTW → ORD Jul 20, 12:50 UTCJul 20, 14:10 UTC1h 20m
2026-07-20 UAL2317 EWR → AUS Jul 20, 02:50 UTCJul 20, 03:50 UTC1h 0m
2026-07-19 UAL1990 LAX → EWR Jul 19, 22:30 UTCJul 20, 00:50 UTC2h 20m
2026-07-19 UAL622 ORD → AUS Jul 19, 19:05 UTCJul 19, 21:15 UTC2h 10m
2026-07-19 UAL622 ORD → AUS Jul 19, 18:59 UTCJul 19, 21:11 UTC2h 12m
2026-07-19 UAL1660 ANC → EWR Jul 19, 16:15 UTCJul 19, 16:50 UTC35m
2026-07-19 UAL2093 - Jul 19, 14:35 UTCJul 19, 15:05 UTC30m
2026-07-19 UAL1517 DFW → ORD Jul 19, 02:15 UTCJul 19, 04:10 UTC1h 55m
2026-07-18 UAL793 SFO → ORD Jul 18, 22:40 UTCJul 19, 00:35 UTC1h 55m
2026-07-18 UAL793 SFO → ORD Jul 18, 21:38 UTCJul 19, 00:29 UTC2h 51m
2026-07-18 UAL1107 CVG → ORD Jul 18, 19:00 UTCJul 18, 20:05 UTC1h 5m
2026-07-18 UAL365 - Jul 18, 16:20 UTCJul 18, 17:10 UTC50m
2026-07-18 UAL786 - Jul 18, 13:35 UTCJul 18, 15:05 UTC1h 30m
2026-07-18 UAL2762 SFO → FTW Jul 18, 04:33 UTCJul 18, 05:45 UTC1h 12m
2026-07-18 UAL2762 SFO → FTW Jul 18, 04:30 UTCJul 18, 05:45 UTC1h 15m
2026-07-18 UAL658 AUS → EWR Jul 18, 00:39 UTCJul 18, 01:39 UTC1h 0m

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 N818UA page for operator, model, and routing details .

Mode-S AB28D7 frequently asked

What is Mode-S code AB28D7?
AB28D7 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N818UA.
Where is Mode-S AB28D7 registered?
Mode-S code AB28D7 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 AB28D7 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:45 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AB28D7, octal 52624327, decimal 11,217,111.
What flights does AB28D7 operate?
Mode-S AB28D7 has broadcast 20 distinct callsigns, including UAL581, UAL1604, UAL1510, UAL1479, UAL1235.