Apparatus

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sensors Mode-S transponder

A43EED

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N37298 · BOEING 737-800 · operated by UMB BANK NA TRUSTEE

Hex
A43EED
Octal
51037355
Decimal
10,764,013
Country
US
Tail
N37298
Type
B738
Broadcasting now · callsign UAL2753 · 38,000 ft
Flights observed
468
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 19:35 UTC

Current position

A43EED is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A43EED 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
UAL717 United Airlines 6 2026-06-14
UAL565 United Airlines 6 2026-06-14
UAL1821 United Airlines 5 2026-06-08
UAL683 - 4 2026-07-23
UAL643 United Airlines 4 2026-05-03
UAL533 - 4 2026-07-06
UAL2635 United Airlines 4 2026-06-08
UAL2443 United Airlines 4 2026-05-23
UAL1649 United Airlines 4 2026-06-14
UAL1505 United Airlines 4 2026-05-01
UAL1257 United Airlines 4 2026-07-17
UAL1236 - 4 2026-07-08
UAL8130 - 3 2026-07-15
UAL786 United Airlines 3 2026-06-21
UAL741 - 3 2026-06-26
UAL645 United Airlines 3 2026-07-23
UAL602 - 3 2026-07-05
UAL361 United Airlines 3 2026-04-14
UAL2771 - 3 2026-07-05
UAL2487 - 3 2026-06-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL430 BNA → EWR Jul 26, 17:45 UTCJul 26, 19:35 UTC1h 50m
2026-07-26 UAL2045 TPA → EWR Jul 26, 11:45 UTCJul 26, 15:20 UTC3h 35m
2026-07-25 UAL1741 MSY → EWR Jul 25, 22:35 UTCJul 26, 02:10 UTC3h 35m
2026-07-25 UAL1741 MSY → EWR Jul 25, 22:29 UTCJul 26, 02:10 UTC3h 41m
2026-07-25 UAL1396 RSW → EWR Jul 25, 19:45 UTCJul 25, 20:30 UTC45m
2026-07-25 UAL1217 IAH → BOS Jul 25, 17:35 UTCJul 25, 18:15 UTC40m
2026-07-25 UAL1424 ORD → AUS Jul 25, 14:30 UTCJul 25, 15:45 UTC1h 15m
2026-07-24 UAL1184 IAH → MSY Jul 24, 23:45 UTCJul 25, 00:45 UTC1h 0m
2026-07-24 UAL1306 EWR → CHS Jul 24, 20:00 UTCJul 24, 22:15 UTC2h 15m
2026-07-24 UAL1887 DEN → BDL Jul 24, 15:55 UTCJul 24, 18:00 UTC2h 5m
2026-07-24 UAL2865 DEN → ORD Jul 24, 12:10 UTCJul 24, 14:05 UTC1h 55m
2026-07-24 UAL2479 ORD → LAS Jul 24, 02:55 UTCJul 24, 04:55 UTC2h 0m
2026-07-23 UAL1943 ORD → CHS Jul 23, 23:45 UTCJul 24, 01:10 UTC1h 25m
2026-07-23 UAL2327 ORD → SFO Jul 23, 21:20 UTCJul 23, 22:20 UTC1h 0m
2026-07-23 UAL645 LAX → EWR Jul 23, 16:55 UTCJul 23, 20:10 UTC3h 15m
2026-07-23 UAL683 IAD → TPA Jul 23, 13:21 UTCJul 23, 15:20 UTC1h 59m
2026-07-23 UAL683 IAD → TPA Jul 23, 13:30 UTCJul 23, 15:25 UTC1h 55m
2026-07-21 UAL2275 YYC → IAD Jul 21, 21:20 UTCJul 22, 01:15 UTC3h 55m
2026-07-21 UAL2459 DEN → YYC Jul 21, 17:35 UTCJul 21, 19:30 UTC1h 55m
2026-07-21 UAL671 DEN → BZN Jul 21, 12:20 UTCJul 21, 15:25 UTC3h 5m
2026-07-20 UAL1485 DEN → SFO Jul 20, 22:30 UTCJul 21, 01:25 UTC2h 55m
2026-07-20 UAL2470 DEN → MCI Jul 20, 18:10 UTCJul 20, 20:40 UTC2h 30m
2026-07-20 UAL362 DEN → YVR Jul 20, 14:05 UTCJul 20, 16:35 UTC2h 30m
2026-07-20 UAL362 STL → DEN Jul 20, 10:15 UTCJul 20, 12:05 UTC1h 50m
2026-07-20 UAL1422 DEN → STL Jul 20, 01:55 UTCJul 20, 03:30 UTC1h 35m
2026-07-19 UAL1953 YYC → DEN Jul 19, 22:20 UTCJul 20, 00:10 UTC1h 50m
2026-07-19 UAL1832 CUN → IAH Jul 19, 16:21 UTCJul 19, 20:47 UTC4h 26m
2026-07-19 UAL1832 CUN → IAH Jul 19, 16:25 UTCJul 19, 20:50 UTC4h 25m
2026-07-18 UAL1373 ORD → DCA Jul 18, 23:45 UTCJul 19, 02:20 UTC2h 35m
2026-07-18 UAL1373 ORD → DCA Jul 18, 19:30 UTCJul 18, 21:50 UTC2h 20m
2026-07-18 UAL1895 IAH → PHX Jul 18, 15:15 UTCJul 18, 17:30 UTC2h 15m
2026-07-18 UAL2453 BIL → DEN Jul 18, 11:15 UTCJul 18, 13:05 UTC1h 50m
2026-07-18 UAL2293 - Jul 18, 02:25 UTCJul 18, 04:20 UTC1h 56m
2026-07-18 UAL2293 IAH → JAX Jul 18, 02:25 UTCJul 18, 04:17 UTC1h 52m
2026-07-17 UAL618 EWR → DEN Jul 17, 22:25 UTCJul 18, 01:10 UTC2h 45m
2026-07-17 UAL1257 DEN → LGA Jul 17, 19:45 UTCJul 17, 20:55 UTC1h 10m
2026-07-17 UAL1113 - Jul 17, 17:09 UTCJul 17, 18:15 UTC1h 5m
2026-07-17 UAL1113 PWM → ORD Jul 17, 16:43 UTCJul 17, 18:22 UTC1h 39m
2026-07-17 UAL1980 - Jul 17, 13:55 UTCJul 17, 15:05 UTC1h 10m
2026-07-17 UAL2615 LAS → SFO Jul 17, 05:50 UTCJul 17, 06:50 UTC1h 0m
2026-07-17 UAL655 DEN → LAS Jul 17, 02:50 UTCJul 17, 04:14 UTC1h 25m
2026-07-16 UAL1483 STL → DEN Jul 16, 22:10 UTCJul 16, 23:55 UTC1h 45m
2026-07-16 UAL2000 ORD → STL Jul 16, 20:05 UTCJul 16, 20:58 UTC53m
2026-07-16 UAL2000 ORD → STL Jul 16, 20:09 UTCJul 16, 21:00 UTC50m
2026-07-15 UAL2797 PHL → ORD Jul 15, 23:30 UTCJul 16, 01:10 UTC1h 40m
2026-07-15 UAL2430 - Jul 15, 20:20 UTCJul 15, 22:05 UTC1h 45m
2026-07-15 UAL576 MSP → ORD Jul 15, 16:49 UTCJul 15, 17:42 UTC53m
2026-07-15 UAL576 - Jul 15, 17:00 UTCJul 15, 17:55 UTC55m
2026-07-15 UAL2805 - Jul 15, 14:00 UTCJul 15, 14:55 UTC55m
2026-07-15 UAL2752 - Jul 15, 11:10 UTCJul 15, 12:00 UTC50m

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 N37298 page for operator, model, and routing details .

Mode-S A43EED frequently asked

What is Mode-S code A43EED?
A43EED is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N37298.
Where is Mode-S A43EED registered?
Mode-S code A43EED 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 A43EED broadcasting right now?
Yes. Mode-S A43EED is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A43EED, octal 51037355, decimal 10,764,013.
What flights does A43EED operate?
Mode-S A43EED has broadcast 20 distinct callsigns, including UAL717, UAL565, UAL1821, UAL683, UAL643.