Apparatus

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sensors Mode-S transponder

A219EA

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N2341U · BOEING 777-300ER · operated by UNITED AIRLINES INC

Hex
A219EA
Octal
50414752
Decimal
10,623,466
Country
US
Tail
N2341U
Type
B77W
Transponder active on ground
Flights observed
261
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:00 UTC

Last known position

Most recent position reported by Mode-S A219EA.

Country allocation

The ICAO 24-bit address A219EA 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
UAL872 - 15 2026-07-16
UAL871 - 14 2026-07-15
UAL857 - 14 2026-07-09
UAL79 United Airlines 11 2026-07-25
UAL1960 - 11 2026-07-06
UAL858 - 10 2026-07-10
UAL2416 United Airlines 10 2026-07-25
UAL869 United Airlines 9 2026-07-17
UAL810 United Airlines 9 2026-07-24
UAL809 United Airlines 9 2026-07-23
UAL78 United Airlines 9 2026-07-26
UAL41 United Airlines 9 2026-05-25
UAL988 - 8 2026-07-03
UAL951 United Airlines 8 2026-07-04
UAL40 United Airlines 8 2026-05-24
UAL1175 - 8 2026-06-30
UAL989 - 7 2026-07-05
UAL950 - 7 2026-07-03
UAL878 United Airlines 7 2026-07-18
UAL43 - 7 2026-07-05

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL78 NRT → EWR Jul 26, 08:40 UTCJul 26, 20:55 UTC12h 15m
2026-07-25 UAL79 EWR → NRT Jul 25, 15:55 UTCJul 26, 04:50 UTC12h 55m
2026-07-25 UAL2416 LAS → SFO Jul 25, 08:16 UTCJul 25, 13:08 UTC4h 52m
2026-07-25 UAL2416 LAS → SFO Jul 25, 08:35 UTCJul 25, 13:05 UTC4h 30m
2026-07-24 UAL810 PHL → DEN Jul 24, 13:41 UTCJul 25, 01:58 UTC12h 17m
2026-07-24 UAL810 PHL → DEN Jul 24, 13:40 UTCJul 25, 02:05 UTC12h 25m
2026-07-23 UAL809 SEA → IAD Jul 23, 21:54 UTCJul 24, 10:25 UTC12h 31m
2026-07-23 UAL809 SEA → IAD Jul 23, 21:50 UTCJul 24, 10:20 UTC12h 30m
2026-07-23 UAL838 NRT → SFO Jul 23, 08:50 UTCJul 23, 09:15 UTC25m
2026-07-23 UAL838 NRT → SFO Jul 23, 08:31 UTCJul 23, 18:04 UTC9h 33m
2026-07-22 UAL79 EWR → NRT Jul 22, 16:12 UTCJul 23, 05:56 UTC13h 44m
2026-07-22 UAL79 EWR → NRT Jul 22, 16:15 UTCJul 23, 05:55 UTC13h 40m
2026-07-22 UAL2416 LAS → SFO Jul 22, 10:20 UTCJul 22, 12:35 UTC2h 15m
2026-07-21 UAL810 PHL → DEN Jul 21, 16:10 UTCJul 22, 04:45 UTC12h 35m
2026-07-20 UAL809 SEA → IAD Jul 20, 22:05 UTCJul 21, 11:15 UTC13h 10m
2026-07-20 UAL838 NRT → SFO Jul 20, 09:10 UTCJul 20, 18:20 UTC9h 10m
2026-07-19 UAL79 EWR → NRT Jul 19, 17:50 UTCJul 20, 06:50 UTC13h 0m
2026-07-19 UAL2416 LAS → SFO Jul 19, 07:50 UTCJul 19, 12:25 UTC4h 35m
2026-07-18 UAL878 HKG → SFO Jul 18, 14:51 UTCJul 19, 03:15 UTC12h 24m
2026-07-18 UAL878 HKG → SFO Jul 18, 14:45 UTCJul 19, 03:20 UTC12h 35m
2026-07-17 UAL869 SFO → HKG Jul 17, 21:25 UTCJul 18, 10:05 UTC12h 41m
2026-07-17 UAL838 NRT → SFO Jul 17, 08:31 UTCJul 17, 17:50 UTC9h 19m
2026-07-17 UAL838 - Jul 17, 08:40 UTCJul 17, 17:55 UTC9h 15m
2026-07-16 UAL837 SFO → NRT Jul 16, 19:55 UTCJul 17, 05:39 UTC9h 45m
2026-07-16 UAL872 - Jul 16, 03:50 UTCJul 16, 13:40 UTC9h 50m
2026-07-16 UAL872 - Jul 16, 02:20 UTCJul 16, 02:30 UTC10m
2026-07-15 UAL871 - Jul 15, 10:30 UTCJul 15, 10:45 UTC15m
2026-07-14 UAL871 SFO → TPE Jul 14, 22:39 UTCJul 15, 10:44 UTC12h 5m
2026-07-14 UAL871 - Jul 14, 23:00 UTCJul 15, 09:15 UTC10h 15m
2026-07-13 UAL1844 EWR → SFO Jul 13, 23:24 UTCJul 14, 04:22 UTC4h 58m
2026-07-13 UAL1844 - Jul 13, 23:20 UTCJul 14, 04:30 UTC5h 10m
2026-07-13 UAL435 - Jul 13, 15:55 UTCJul 13, 20:50 UTC4h 55m
2026-07-13 UAL190 - Jul 13, 00:55 UTCJul 13, 13:15 UTC12h 20m
2026-07-12 UAL189 SFO → MNL Jul 12, 08:15 UTCJul 12, 21:40 UTC13h 25m
2026-07-11 UAL810 - Jul 11, 13:40 UTCJul 12, 01:50 UTC12h 10m
2026-07-11 UAL810 MNL → SFO Jul 11, 13:41 UTCJul 12, 01:46 UTC12h 5m
2026-07-10 UAL809 SFO → MNL Jul 10, 22:00 UTCJul 11, 11:20 UTC13h 20m
2026-07-10 UAL858 - Jul 10, 05:20 UTCJul 10, 15:25 UTC10h 5m
2026-07-10 UAL858 PVG → SFO Jul 10, 04:44 UTCJul 10, 15:20 UTC10h 36m
2026-07-09 UAL857 - Jul 9, 06:35 UTCJul 10, 06:30 UTC23h 55m
2026-07-08 UAL857 SFO → PVG Jul 8, 20:57 UTCJul 9, 09:01 UTC12h 4m
2026-07-08 UAL857 - Jul 8, 20:55 UTCJul 9, 08:05 UTC11h 10m
2026-07-08 UAL872 - Jul 8, 03:40 UTCJul 8, 13:20 UTC9h 40m
2026-07-08 UAL872 - Jul 8, 02:10 UTCJul 8, 02:25 UTC15m
2026-07-06 UAL871 - Jul 6, 22:45 UTCJul 6, 23:10 UTC25m
2026-07-06 UAL871 SFO → TPE Jul 6, 22:35 UTCJul 7, 10:51 UTC12h 16m
2026-07-06 UAL1960 - Jul 6, 15:05 UTCJul 6, 20:05 UTC5h 0m
2026-07-05 UAL43 FRA → EWR Jul 5, 11:45 UTCJul 5, 19:50 UTC8h 5m
2026-07-05 UAL989 IAD → FRA Jul 5, 01:40 UTCJul 5, 08:55 UTC7h 15m
2026-07-04 UAL951 BRU → IAD Jul 4, 10:27 UTCJul 4, 18:18 UTC7h 51m

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 N2341U page for operator, model, and routing details .

Mode-S A219EA frequently asked

What is Mode-S code A219EA?
A219EA is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N2341U.
Where is Mode-S A219EA registered?
Mode-S code A219EA 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 A219EA broadcasting right now?
Mode-S A219EA is currently broadcasting from the ground.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A219EA, octal 50414752, decimal 10,623,466.
What flights does A219EA operate?
Mode-S A219EA has broadcast 20 distinct callsigns, including UAL872, UAL871, UAL857, UAL79, UAL1960.