Apparatus

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sensors Mode-S transponder

AD22E1

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N94556 · AIRBUS A-321neo · operated by UNITED AIRLINES INC

Hex
AD22E1
Octal
53221341
Decimal
11,346,657
Country
US
Tail
N94556
Type
A21N
No current signal · last broadcast Jul 26, 22:15 UTC
Flights observed
412
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:15 UTC

Last known position

Most recent position reported by Mode-S AD22E1.

Country allocation

The ICAO 24-bit address AD22E1 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
UAL2618 - 7 2026-07-14
UAL1363 - 6 2026-07-01
UAL647 - 5 2026-07-13
UAL2481 - 5 2026-06-30
UAL2197 United Airlines 5 2026-05-31
UAL2123 United Airlines 5 2026-07-19
UAL1010 United Airlines 5 2026-05-16
UAL1007 - 5 2026-06-27
UAL800 United Airlines 4 2026-07-18
UAL597 - 4 2026-07-12
UAL2455 United Airlines 4 2026-07-26
UAL212 - 4 2026-07-02
UAL1915 United Airlines 4 2026-05-26
UAL1850 - 4 2026-07-19
UAL1377 United Airlines 4 2026-05-18
UAL1159 United Airlines 4 2026-05-06
UAL788 United Airlines 3 2026-04-21
UAL723 United Airlines 3 2026-04-13
UAL670 - 3 2026-07-16
UAL540 United Airlines 3 2026-07-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL1505 EWR → DEN Jul 26, 20:35 UTCJul 26, 22:15 UTC1h 40m
2026-07-26 UAL2455 EWR → ATL Jul 26, 14:15 UTCJul 26, 17:55 UTC3h 40m
2026-07-26 UAL2613 DEN → EWR Jul 26, 00:40 UTCJul 26, 03:50 UTC3h 10m
2026-07-25 UAL540 PDX → DEN Jul 25, 20:30 UTCJul 25, 22:15 UTC1h 45m
2026-07-25 UAL540 PDX → DEN Jul 25, 20:30 UTCJul 25, 22:33 UTC2h 3m
2026-07-25 UAL1506 SFO → ORD Jul 25, 16:20 UTCJul 25, 18:40 UTC2h 20m
2026-07-25 UAL1506 SFO → ORD Jul 25, 16:16 UTCJul 25, 18:31 UTC2h 15m
2026-07-25 UAL459 ORD → LAS Jul 25, 12:05 UTCJul 25, 14:10 UTC2h 5m
2026-07-25 UAL498 PDX → EWR Jul 25, 02:10 UTCJul 25, 04:20 UTC2h 10m
2026-07-24 UAL2297 EWR → LAS Jul 24, 19:20 UTCJul 24, 23:10 UTC3h 50m
2026-07-24 UAL558 HNL → SFO Jul 24, 14:10 UTCJul 24, 17:35 UTC3h 25m
2026-07-24 UAL2666 ORD → DEN Jul 24, 10:15 UTCJul 24, 12:10 UTC1h 55m
2026-07-24 UAL2487 RSW → EWR Jul 24, 01:10 UTCJul 24, 01:30 UTC20m
2026-07-23 UAL2487 RSW → EWR Jul 23, 21:40 UTCJul 24, 01:30 UTC3h 50m
2026-07-23 UAL2487 RSW → EWR Jul 23, 21:44 UTCJul 24, 00:53 UTC3h 9m
2026-07-23 UAL1044 EWR → DEN Jul 23, 15:55 UTCJul 23, 19:35 UTC3h 40m
2026-07-23 UAL2800 - Jul 23, 11:30 UTCJul 23, 13:20 UTC1h 50m
2026-07-23 UAL534 HNL → LAX Jul 23, 00:45 UTCJul 23, 02:10 UTC1h 25m
2026-07-22 UAL2113 EWR → ATL Jul 22, 18:10 UTCJul 22, 21:40 UTC3h 30m
2026-07-22 UAL2361 SFO → IAH Jul 22, 12:20 UTCJul 22, 16:00 UTC3h 40m
2026-07-22 UAL2361 SFO → IAH Jul 22, 12:33 UTCJul 22, 15:52 UTC3h 19m
2026-07-22 UAL1262 ORD → BOS Jul 22, 02:25 UTCJul 22, 04:20 UTC1h 55m
2026-07-21 UAL1354 SAT → IAD Jul 21, 20:35 UTCJul 21, 23:55 UTC3h 20m
2026-07-21 UAL1102 MSN → EWR Jul 21, 16:30 UTCJul 21, 18:50 UTC2h 20m
2026-07-21 UAL2631 ORD → MCI Jul 21, 12:25 UTCJul 21, 14:35 UTC2h 10m
2026-07-21 UAL1779 MIA → EWR Jul 21, 03:55 UTCJul 21, 05:45 UTC1h 50m
2026-07-20 UAL1779 MIA → EWR Jul 20, 21:30 UTCJul 21, 01:20 UTC3h 49m
2026-07-20 UAL1940 DEN → SAN Jul 20, 18:05 UTCJul 20, 19:55 UTC1h 50m
2026-07-20 UAL1940 DEN → SAN Jul 20, 17:51 UTCJul 20, 19:50 UTC1h 59m
2026-07-20 UAL2154 ORD → TPA Jul 20, 12:40 UTCJul 20, 16:15 UTC3h 35m
2026-07-20 UAL2033 RNO → SFO Jul 20, 00:13 UTCJul 20, 03:22 UTC3h 9m
2026-07-20 UAL2033 RNO → SFO Jul 20, 00:15 UTCJul 20, 03:25 UTC3h 10m
2026-07-19 UAL1565 SFO → PHX Jul 19, 19:50 UTCJul 19, 21:50 UTC2h 0m
2026-07-19 UAL660 - Jul 19, 14:25 UTCJul 19, 17:55 UTC3h 30m
2026-07-19 UAL660 ORD → SAN Jul 19, 14:21 UTCJul 19, 17:53 UTC3h 32m
2026-07-19 UAL1850 - Jul 19, 08:35 UTCJul 19, 12:10 UTC3h 35m
2026-07-19 UAL1850 ORD → MSY Jul 19, 08:40 UTCJul 19, 12:04 UTC3h 24m
2026-07-19 UAL2123 AUS → SFO Jul 19, 03:45 UTCJul 19, 05:50 UTC2h 5m
2026-07-18 UAL800 EWR → MCO Jul 18, 22:20 UTCJul 19, 02:15 UTC3h 55m
2026-07-18 UAL1232 DEN → BOS Jul 18, 17:00 UTCJul 18, 20:20 UTC3h 20m
2026-07-18 UAL1889 SMF → DEN Jul 18, 13:00 UTCJul 18, 14:55 UTC1h 55m
2026-07-18 UAL2132 DEN → SMF Jul 18, 02:00 UTCJul 18, 03:55 UTC1h 56m
2026-07-17 UAL746 DCA → DEN Jul 17, 20:44 UTCJul 18, 00:00 UTC3h 15m
2026-07-17 UAL746 DCA → DEN Jul 17, 20:34 UTCJul 17, 23:59 UTC3h 25m
2026-07-17 UAL789 DEN → DCA Jul 17, 15:49 UTCJul 17, 19:05 UTC3h 15m
2026-07-17 UAL2643 - Jul 17, 11:39 UTCJul 17, 13:29 UTC1h 50m
2026-07-17 UAL1253 PHX → ORD Jul 17, 03:29 UTCJul 17, 05:10 UTC1h 41m
2026-07-17 UAL1253 PHX → ORD Jul 17, 03:20 UTCJul 17, 05:10 UTC1h 50m
2026-07-16 UAL1197 - Jul 16, 21:40 UTCJul 17, 01:05 UTC3h 25m
2026-07-16 UAL1423 DEN → EWR Jul 16, 16:19 UTCJul 16, 19:35 UTC3h 15m

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 N94556 page for operator, model, and routing details .

Mode-S AD22E1 frequently asked

What is Mode-S code AD22E1?
AD22E1 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N94556.
Where is Mode-S AD22E1 registered?
Mode-S code AD22E1 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 AD22E1 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AD22E1, octal 53221341, decimal 11,346,657.
What flights does AD22E1 operate?
Mode-S AD22E1 has broadcast 20 distinct callsigns, including UAL2618, UAL1363, UAL647, UAL2481, UAL2197.