Apparatus

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sensors Mode-S transponder

A2A2DF

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N26902 · BOEING 787-8 Dreamliner · operated by UNITED AIRLINES INC

Hex
A2A2DF
Octal
50521337
Decimal
10,658,527
Country
US
Tail
N26902
Type
B788
No current signal · last broadcast Jul 26, 11:20 UTC
Flights observed
227
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 11:20 UTC

Last known position

Most recent position reported by Mode-S A2A2DF.

Country allocation

The ICAO 24-bit address A2A2DF 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
UAL983 - 20 2026-07-19
UAL982 - 20 2026-07-17
UAL612 United Airlines 18 2026-07-26
UAL996 United Airlines 17 2026-07-20
UAL613 - 17 2026-06-25
UAL997 United Airlines 10 2026-07-20
UAL991 - 10 2026-07-17
UAL422 United Airlines 10 2026-04-29
UAL992 - 9 2026-07-16
UAL423 United Airlines 9 2026-04-30
UAL345 United Airlines 9 2026-07-24
UAL344 United Airlines 9 2026-07-25
UAL109 - 8 2026-07-16
UAL415 United Airlines 7 2026-04-18
UAL981 United Airlines 6 2026-04-29
UAL1147 United Airlines 6 2026-06-07
UAL416 United Airlines 5 2026-04-18
UAL108 - 5 2026-07-15
UAL980 United Airlines 3 2026-04-29
UAL953 United Airlines 3 2026-05-19

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL612 IAD → LOS Jul 26, 03:48 UTCJul 26, 13:54 UTC10h 6m
2026-07-26 UAL612 IAD → LOS Jul 26, 03:40 UTCJul 26, 11:20 UTC7h 41m
2026-07-25 UAL344 HNL → IAD Jul 25, 05:10 UTCJul 25, 10:00 UTC4h 50m
2026-07-25 UAL344 HNL → IAD Jul 25, 01:45 UTCJul 25, 02:05 UTC20m
2026-07-24 UAL345 IAD → HNL Jul 24, 13:00 UTCJul 24, 22:35 UTC9h 35m
2026-07-24 UAL345 IAD → HNL Jul 24, 12:50 UTCJul 24, 22:28 UTC9h 38m
2026-07-24 UAL344 HNL → IAD Jul 24, 01:40 UTCJul 24, 09:50 UTC8h 10m
2026-07-23 UAL345 IAD → HNL Jul 23, 12:50 UTCJul 23, 22:45 UTC9h 55m
2026-07-23 UAL345 IAD → HNL Jul 23, 13:20 UTCJul 23, 22:45 UTC9h 25m
2026-07-23 UAL344 HNL → IAD Jul 23, 01:40 UTCJul 23, 09:55 UTC8h 15m
2026-07-22 UAL345 IAD → HNL Jul 22, 23:50 UTCJul 23, 00:05 UTC15m
2026-07-22 UAL345 IAD → HNL Jul 22, 14:20 UTCJul 22, 19:25 UTC5h 5m
2026-07-20 UAL996 IAD → ACC Jul 20, 23:30 UTCJul 21, 07:15 UTC7h 44m
2026-07-20 UAL997 ACC → IAD Jul 20, 07:06 UTCJul 20, 16:52 UTC9h 46m
2026-07-19 UAL997 ACC → IAD Jul 19, 19:10 UTCJul 20, 16:55 UTC21h 45m
2026-07-19 UAL996 - Jul 19, 12:20 UTCJul 20, 09:50 UTC21h 30m
2026-07-19 UAL983 - Jul 19, 06:30 UTCJul 19, 07:10 UTC40m
2026-07-19 UAL983 RDU → IAD Jul 19, 06:20 UTCJul 19, 07:07 UTC47m
2026-07-18 UAL983 ATH → RDU Jul 18, 09:15 UTCJul 18, 21:00 UTC11h 45m
2026-07-18 UAL983 ATH → RDU Jul 18, 09:05 UTCJul 18, 20:39 UTC11h 34m
2026-07-17 UAL982 IAD → ATH Jul 17, 21:50 UTCJul 18, 06:50 UTC9h 1m
2026-07-17 UAL991 BCN → IAD Jul 17, 09:50 UTCJul 17, 17:50 UTC8h 0m
2026-07-16 UAL992 IAD → BCN Jul 16, 22:59 UTCJul 17, 06:15 UTC7h 15m
2026-07-16 UAL109 - Jul 16, 10:20 UTCJul 16, 18:40 UTC8h 20m
2026-07-15 UAL108 IAD → MUC Jul 15, 22:10 UTCJul 16, 06:00 UTC7h 50m
2026-07-15 UAL109 - Jul 15, 10:25 UTCJul 15, 18:45 UTC8h 20m
2026-07-14 UAL108 IAD → MUC Jul 14, 21:50 UTCJul 15, 05:35 UTC7h 44m
2026-07-13 UAL344 - Jul 13, 05:15 UTCJul 13, 10:15 UTC5h 0m
2026-07-13 UAL344 - Jul 13, 01:40 UTCJul 13, 02:01 UTC20m
2026-07-12 UAL345 - Jul 12, 13:10 UTCJul 12, 22:10 UTC9h 0m
2026-07-12 UAL997 - Jul 12, 00:55 UTCJul 12, 08:25 UTC7h 30m
2026-07-11 UAL996 - Jul 11, 06:30 UTCJul 12, 01:15 UTC18h 45m
2026-07-10 UAL996 - Jul 10, 23:45 UTCJul 11, 07:20 UTC7h 35m
2026-07-10 UAL344 - Jul 10, 01:35 UTCJul 10, 10:10 UTC8h 35m
2026-07-09 UAL345 - Jul 9, 13:05 UTCJul 9, 22:45 UTC9h 40m
2026-07-08 UAL991 BCN → IAD Jul 8, 09:35 UTCJul 8, 17:40 UTC8h 5m
2026-07-07 UAL992 IAD → BCN Jul 7, 22:56 UTCJul 8, 06:10 UTC7h 14m
2026-07-07 UAL992 IAD → BCN Jul 7, 23:00 UTCJul 8, 00:50 UTC1h 50m
2026-07-07 UAL109 EDI → EWR Jul 7, 10:30 UTCJul 7, 12:55 UTC2h 25m
2026-07-07 UAL109 EDI → EWR Jul 7, 10:19 UTCJul 7, 18:55 UTC8h 36m
2026-07-07 UAL108 EWR → EDI Jul 7, 00:40 UTCJul 7, 08:25 UTC7h 45m
2026-07-05 UAL997 - Jul 5, 07:45 UTCJul 5, 15:45 UTC8h 0m
2026-07-05 UAL997 ACC → IAD Jul 5, 05:48 UTCJul 5, 15:47 UTC9h 59m
2026-07-03 UAL996 - Jul 3, 23:20 UTCJul 4, 07:15 UTC7h 55m
2026-07-02 UAL983 ATH → IAD Jul 2, 09:05 UTCJul 2, 19:49 UTC10h 44m
2026-07-02 UAL983 ATH → IAD Jul 2, 09:20 UTCJul 2, 19:50 UTC10h 30m
2026-07-01 UAL982 IAD → ATH Jul 1, 21:43 UTCJul 2, 06:33 UTC8h 50m
2026-07-01 UAL982 IAD → ATH Jul 1, 21:25 UTCJul 2, 06:41 UTC9h 16m
2026-06-30 UAL983 ATH → IAD Jun 30, 09:35 UTCJun 30, 19:25 UTC9h 50m
2026-06-29 UAL982 IAD → ATH Jun 29, 21:43 UTCJun 30, 06:53 UTC9h 10m

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 N26902 page for operator, model, and routing details .

Mode-S A2A2DF frequently asked

What is Mode-S code A2A2DF?
A2A2DF is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N26902.
Where is Mode-S A2A2DF registered?
Mode-S code A2A2DF 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 A2A2DF broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 11:20 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A2A2DF, octal 50521337, decimal 10,658,527.
What flights does A2A2DF operate?
Mode-S A2A2DF has broadcast 20 distinct callsigns, including UAL983, UAL982, UAL612, UAL996, UAL613.