Apparatus

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sensors Mode-S transponder

A9D5E5

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N73276 · BOEING 737-800 · operated by UNITED AIRLINES INC

Hex
A9D5E5
Octal
52352745
Decimal
11,130,341
Country
US
Tail
N73276
Type
B738
No current signal · last broadcast Jul 26, 21:05 UTC
Flights observed
457
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:05 UTC

Last known position

Most recent position reported by Mode-S A9D5E5.

Country allocation

The ICAO 24-bit address A9D5E5 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
UAL1125 United Airlines 8 2026-05-09
UAL623 - 5 2026-07-16
UAL275 - 5 2026-07-20
UAL382 - 4 2026-06-24
UAL2857 - 4 2026-06-17
UAL2446 United Airlines 4 2026-07-23
UAL2342 United Airlines 4 2026-06-14
UAL2059 United Airlines 4 2026-07-23
UAL1911 - 4 2026-07-20
UAL1781 United Airlines 4 2026-06-04
UAL1569 United Airlines 4 2026-07-19
UAL1225 United Airlines 4 2026-04-25
UAL762 - 3 2026-07-23
UAL590 United Airlines 3 2026-06-12
UAL493 United Airlines 3 2026-06-13
UAL478 United Airlines 3 2026-05-19
UAL431 United Airlines 3 2026-05-27
UAL378 United Airlines 3 2026-07-23
UAL2829 United Airlines 3 2026-06-19
UAL2424 United Airlines 3 2026-05-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL1854 GCM → IAH Jul 26, 19:10 UTCJul 26, 21:05 UTC1h 55m
2026-07-26 UAL551 IAH → GCM Jul 26, 14:45 UTCJul 26, 16:35 UTC1h 50m
2026-07-26 UAL551 IAH → GCM Jul 26, 14:56 UTCJul 26, 17:08 UTC2h 12m
2026-07-26 UAL2302 EWR → MSY Jul 26, 10:20 UTCJul 26, 12:50 UTC2h 30m
2026-07-25 UAL2439 TPA → ORD Jul 25, 23:35 UTCJul 26, 02:10 UTC2h 35m
2026-07-25 UAL1242 SAP → IAH Jul 25, 18:47 UTCJul 25, 21:02 UTC2h 15m
2026-07-25 UAL1242 SAP → IAH Jul 25, 15:10 UTCJul 25, 21:05 UTC5h 55m
2026-07-25 UAL2371 DFW → SFO Jul 25, 10:15 UTCJul 25, 13:15 UTC3h 0m
2026-07-24 UAL1623 EWR → AUS Jul 24, 23:25 UTCJul 25, 01:10 UTC1h 45m
2026-07-24 UAL2160 PHX → SFO Jul 24, 19:25 UTCJul 24, 21:35 UTC2h 10m
2026-07-24 UAL441 EWR → FLL Jul 24, 16:10 UTCJul 24, 17:55 UTC1h 45m
2026-07-24 UAL2151 PDX → DEN Jul 24, 13:20 UTCJul 24, 14:05 UTC45m
2026-07-24 UAL2151 PDX → DEN Jul 24, 13:27 UTCJul 24, 13:54 UTC27m
2026-07-24 UAL630 BUF → ORD Jul 24, 03:25 UTCJul 24, 03:50 UTC25m
2026-07-23 UAL2446 FLL → EWR Jul 23, 23:40 UTCJul 24, 01:30 UTC1h 50m
2026-07-23 UAL1617 IAH → BOS Jul 23, 20:40 UTCJul 23, 22:25 UTC1h 45m
2026-07-23 UAL378 ORD → EWR Jul 23, 16:20 UTCJul 23, 18:20 UTC2h 0m
2026-07-23 UAL762 - Jul 23, 12:20 UTCJul 23, 13:55 UTC1h 35m
2026-07-23 UAL2059 SFO → EWR Jul 23, 01:20 UTCJul 23, 01:30 UTC10m
2026-07-23 UAL2059 SFO → EWR Jul 23, 00:04 UTCJul 23, 01:04 UTC1h 0m
2026-07-22 UAL2059 SFO → EWR Jul 22, 23:55 UTCJul 23, 01:30 UTC1h 35m
2026-07-22 UAL1239 EWR → RDU Jul 22, 21:35 UTCJul 22, 22:45 UTC1h 10m
2026-07-22 UAL714 ORD → FLL Jul 22, 17:55 UTCJul 22, 19:55 UTC2h 0m
2026-07-22 UAL709 EWR → FLL Jul 22, 14:25 UTCJul 22, 15:55 UTC1h 30m
2026-07-22 UAL1856 DEN → SFO Jul 22, 11:25 UTCJul 22, 12:10 UTC45m
2026-07-22 UAL1839 SAN → DEN Jul 22, 04:00 UTCJul 22, 04:45 UTC45m
2026-07-21 UAL2048 ORD → MSY Jul 21, 21:05 UTCJul 22, 00:13 UTC3h 8m
2026-07-21 UAL2048 ORD → MSY Jul 21, 21:05 UTCJul 22, 00:55 UTC3h 50m
2026-07-21 UAL245 BZN → EWR Jul 21, 15:00 UTCJul 21, 19:05 UTC4h 5m
2026-07-20 UAL1911 - Jul 20, 23:45 UTCJul 21, 00:20 UTC35m
2026-07-20 UAL1911 - Jul 20, 21:55 UTCJul 20, 22:05 UTC10m
2026-07-20 UAL275 - Jul 20, 19:55 UTCJul 20, 20:10 UTC15m
2026-07-20 UAL275 - Jul 20, 17:50 UTCJul 20, 18:15 UTC25m
2026-07-20 UAL2141 - Jul 20, 01:55 UTCJul 20, 14:50 UTC12h 55m
2026-07-19 UAL1570 - Jul 19, 20:55 UTCJul 19, 22:40 UTC1h 45m
2026-07-19 UAL1569 IAH → BZE Jul 19, 17:25 UTCJul 19, 19:05 UTC1h 40m
2026-07-19 UAL1569 IAH → BZE Jul 19, 17:26 UTCJul 19, 19:24 UTC1h 58m
2026-07-19 UAL2863 - Jul 19, 12:25 UTCJul 19, 15:45 UTC3h 20m
2026-07-19 UAL1148 DEN → BOS Jul 19, 02:05 UTCJul 19, 05:35 UTC3h 30m
2026-07-18 UAL1911 - Jul 18, 23:35 UTCJul 19, 00:10 UTC35m
2026-07-18 UAL1911 - Jul 18, 21:50 UTCJul 18, 21:55 UTC5m
2026-07-18 UAL275 - Jul 18, 20:00 UTCJul 18, 20:15 UTC15m
2026-07-18 UAL275 - Jul 18, 18:00 UTCJul 18, 18:30 UTC30m
2026-07-18 UAL275 IAH → GUA Jul 18, 17:56 UTCJul 18, 20:09 UTC2h 13m
2026-07-18 UAL2319 TPA → IAH Jul 18, 14:12 UTCJul 18, 16:03 UTC1h 51m
2026-07-18 UAL2319 - Jul 18, 14:05 UTCJul 18, 15:55 UTC1h 50m
2026-07-17 UAL1312 - Jul 17, 00:50 UTCJul 17, 02:34 UTC1h 45m
2026-07-17 UAL1312 IAH → TPA Jul 17, 00:36 UTCJul 17, 02:32 UTC1h 56m
2026-07-16 UAL2095 - Jul 16, 20:15 UTCJul 16, 22:49 UTC2h 35m
2026-07-16 UAL2653 ORD → BWI Jul 16, 17:14 UTCJul 16, 18:34 UTC1h 20m

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 N73276 page for operator, model, and routing details .

Mode-S A9D5E5 frequently asked

What is Mode-S code A9D5E5?
A9D5E5 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N73276.
Where is Mode-S A9D5E5 registered?
Mode-S code A9D5E5 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 A9D5E5 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:05 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A9D5E5, octal 52352745, decimal 11,130,341.
What flights does A9D5E5 operate?
Mode-S A9D5E5 has broadcast 20 distinct callsigns, including UAL1125, UAL623, UAL275, UAL382, UAL2857.