Apparatus

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sensors Mode-S transponder

A2B8DB

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N2748U · BOEING 777-300ER · operated by UNITED AIRLINES INC

Hex
A2B8DB
Octal
50534333
Decimal
10,664,155
Country
US
Tail
N2748U
Type
B77W
No current signal · last broadcast Jul 26, 17:35 UTC
Flights observed
251
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 17:35 UTC

Last known position

Most recent position reported by Mode-S A2B8DB.

Country allocation

The ICAO 24-bit address A2B8DB 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
UAL1175 United Airlines 18 2026-07-21
UAL950 United Airlines 15 2026-07-24
UAL878 United Airlines 14 2026-07-19
UAL951 United Airlines 13 2026-07-25
UAL869 United Airlines 11 2026-07-18
UAL42 United Airlines 11 2026-07-23
UAL190 United Airlines 11 2026-07-21
UAL857 United Airlines 10 2026-05-29
UAL43 United Airlines 10 2026-07-26
UAL200 United Airlines 10 2026-07-23
UAL201 United Airlines 9 2026-07-22
UAL988 United Airlines 8 2026-07-24
UAL872 - 8 2026-07-18
UAL871 - 8 2026-07-16
UAL189 - 8 2026-07-20
UAL989 United Airlines 7 2026-07-25
UAL862 United Airlines 7 2026-05-25
UAL41 - 7 2026-07-15
UAL79 - 6 2026-06-28
UAL435 United Airlines 6 2026-07-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL43 OGG → EWR Jul 26, 09:35 UTCJul 26, 17:30 UTC7h 55m
2026-07-25 UAL989 IAD → FRA Jul 25, 22:30 UTCJul 26, 05:30 UTC7h 0m
2026-07-25 UAL951 BRU → IAD Jul 25, 10:15 UTCJul 25, 17:40 UTC7h 25m
2026-07-24 UAL950 IAD → BRU Jul 24, 22:45 UTCJul 25, 00:45 UTC2h 0m
2026-07-24 UAL950 IAD → BRU Jul 24, 22:23 UTCJul 25, 05:36 UTC7h 13m
2026-07-24 UAL988 FRA → IAD Jul 24, 10:45 UTCJul 24, 18:45 UTC8h 0m
2026-07-24 UAL988 FRA → IAD Jul 24, 10:39 UTCJul 24, 18:46 UTC8h 7m
2026-07-23 UAL42 OGG → EWR Jul 23, 23:55 UTCJul 24, 06:20 UTC6h 25m
2026-07-23 UAL435 KOA → SFO Jul 23, 15:45 UTCJul 23, 20:20 UTC4h 35m
2026-07-23 UAL1346 - Jul 23, 08:35 UTCJul 23, 12:40 UTC4h 5m
2026-07-23 UAL200 GUM → HNL Jul 23, 03:40 UTCJul 23, 04:10 UTC30m
2026-07-22 UAL201 HNL → GUM Jul 22, 01:10 UTCJul 22, 01:25 UTC15m
2026-07-21 UAL1175 SFO → HNL Jul 21, 16:53 UTCJul 21, 21:44 UTC4h 51m
2026-07-21 UAL1175 SFO → HNL Jul 21, 17:00 UTCJul 21, 21:45 UTC4h 45m
2026-07-21 UAL190 IAH → MIA Jul 21, 00:55 UTCJul 21, 13:35 UTC12h 40m
2026-07-20 UAL189 - Jul 20, 08:35 UTCJul 20, 21:35 UTC13h 0m
2026-07-19 UAL878 HKG → SFO Jul 19, 14:51 UTCJul 20, 03:25 UTC12h 34m
2026-07-19 UAL878 HKG → SFO Jul 19, 14:50 UTCJul 20, 03:25 UTC12h 35m
2026-07-19 UAL878 HKG → SFO Jul 19, 14:51 UTCJul 20, 03:23 UTC12h 32m
2026-07-18 UAL869 SFO → HKG Jul 18, 21:12 UTCJul 19, 10:11 UTC12h 59m
2026-07-18 UAL869 SFO → HKG Jul 18, 21:10 UTCJul 19, 10:10 UTC13h 0m
2026-07-18 UAL872 - Jul 18, 04:10 UTCJul 18, 04:45 UTC35m
2026-07-18 UAL872 TPE → SFO Jul 18, 02:23 UTCJul 18, 13:41 UTC11h 18m
2026-07-16 UAL871 SFO → TPE Jul 16, 22:10 UTCJul 17, 10:10 UTC12h 0m
2026-07-16 UAL871 SFO → TPE Jul 16, 22:08 UTCJul 17, 10:02 UTC11h 54m
2026-07-15 UAL1844 - Jul 15, 23:40 UTCJul 16, 04:50 UTC5h 10m
2026-07-15 UAL41 - Jul 15, 09:45 UTCJul 15, 10:45 UTC1h 0m
2026-07-15 UAL41 FCO → EWR Jul 15, 09:27 UTCJul 15, 18:30 UTC9h 3m
2026-07-14 UAL40 - Jul 14, 22:20 UTCJul 15, 06:05 UTC7h 44m
2026-07-14 UAL43 - Jul 14, 09:40 UTCJul 14, 17:05 UTC7h 25m
2026-07-13 UAL989 IAD → FRA Jul 13, 21:45 UTCJul 14, 04:55 UTC7h 10m
2026-07-13 UAL951 BRU → IAD Jul 13, 10:45 UTCJul 13, 18:10 UTC7h 25m
2026-07-12 UAL950 - Jul 12, 23:30 UTCJul 13, 02:01 UTC2h 30m
2026-07-12 UAL950 IAD → BRU Jul 12, 23:08 UTCJul 13, 06:48 UTC7h 40m
2026-07-12 UAL951 BRU → IAD Jul 12, 10:25 UTCJul 12, 18:01 UTC7h 35m
2026-07-11 UAL950 - Jul 11, 23:20 UTCJul 12, 01:05 UTC1h 45m
2026-07-11 UAL950 IAD → BRU Jul 11, 23:18 UTCJul 12, 06:07 UTC6h 49m
2026-07-11 UAL988 - Jul 11, 11:40 UTCJul 11, 19:40 UTC8h 0m
2026-07-11 UAL42 - Jul 11, 00:10 UTCJul 11, 06:55 UTC6h 45m
2026-07-10 UAL435 SFO → EWR Jul 10, 15:39 UTCJul 10, 20:45 UTC5h 6m
2026-07-10 UAL435 - Jul 10, 15:35 UTCJul 10, 20:45 UTC5h 10m
2026-07-10 UAL1346 - Jul 10, 12:10 UTCJul 10, 12:45 UTC35m
2026-07-10 UAL200 - Jul 10, 03:40 UTCJul 10, 04:05 UTC25m
2026-07-09 UAL200 GUM → HNL Jul 9, 21:18 UTCJul 10, 04:01 UTC6h 43m
2026-07-09 UAL201 - Jul 9, 01:30 UTCJul 9, 01:55 UTC25m
2026-07-08 UAL1175 - Jul 8, 21:15 UTCJul 8, 21:30 UTC15m
2026-07-08 UAL1175 - Jul 8, 16:45 UTCJul 8, 17:20 UTC35m
2026-07-08 UAL190 - Jul 8, 01:00 UTCJul 8, 13:15 UTC12h 15m
2026-07-07 UAL189 SFO → MNL Jul 7, 08:30 UTCJul 7, 22:00 UTC13h 30m
2026-07-06 UAL810 - Jul 6, 13:45 UTCJul 7, 01:45 UTC12h 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 N2748U page for operator, model, and routing details .

Mode-S A2B8DB frequently asked

What is Mode-S code A2B8DB?
A2B8DB is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N2748U.
Where is Mode-S A2B8DB registered?
Mode-S code A2B8DB 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 A2B8DB broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 17:35 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A2B8DB, octal 50534333, decimal 10,664,155.
What flights does A2B8DB operate?
Mode-S A2B8DB has broadcast 20 distinct callsigns, including UAL1175, UAL950, UAL878, UAL951, UAL869.