Apparatus

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sensors Mode-S transponder

A9D5DF

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N73270 · BOEING 737-800 · operated by UNITED AIRLINES INC

Hex
A9D5DF
Octal
52352737
Decimal
11,130,335
Country
US
Tail
N73270
Type
B738
No current signal · last broadcast 8h ago
Flights observed
217
Distinct callsigns
20
Country
US
Last broadcast
8h ago

Last known position

Most recent position reported by Mode-S A9D5DF.

Country allocation

The ICAO 24-bit address A9D5DF 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
UAL1821 - 5 2026-06-30
UAL1910 - 4 2026-07-03
UAL1029 - 4 2026-07-14
UAL671 - 3 2026-07-17
UAL371 - 3 2026-06-15
UAL248 United Airlines 3 2026-07-18
UAL2323 - 3 2026-06-18
UAL8210 - 2 2026-07-09
UAL8100 - 2 2026-07-11
UAL715 - 2 2026-07-04
UAL703 - 2 2026-07-12
UAL687 - 2 2026-07-14
UAL678 United Airlines 2 2026-06-04
UAL664 United Airlines 2 2026-06-10
UAL571 United Airlines 2 2026-06-26
UAL539 - 2 2026-07-08
UAL478 - 2 2026-07-12
UAL4197 United Airlines 2 2026-06-01
UAL2654 United Airlines 2 2026-06-05
UAL2641 United Airlines 2 2026-06-28

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-18 UAL248 BOS → IAH Jul 18, 00:04 UTCJul 18, 02:45 UTC2h 40m
2026-07-18 UAL248 BOS → IAH Jul 18, 00:03 UTCJul 18, 02:41 UTC2h 38m
2026-07-17 UAL1843 - Jul 17, 20:44 UTCJul 17, 22:29 UTC1h 45m
2026-07-17 UAL1294 DEN → YEG Jul 17, 17:30 UTCJul 17, 19:00 UTC1h 30m
2026-07-17 UAL671 - Jul 17, 12:35 UTCJul 17, 15:40 UTC3h 5m
2026-07-17 UAL671 DEN → SBA Jul 17, 12:32 UTCJul 17, 15:39 UTC3h 7m
2026-07-16 UAL1485 - Jul 16, 22:35 UTCJul 17, 01:35 UTC3h 0m
2026-07-16 UAL645 TPA → DEN Jul 16, 17:05 UTCJul 16, 20:19 UTC3h 15m
2026-07-16 UAL683 IAD → TPA Jul 16, 13:25 UTCJul 16, 15:25 UTC2h 0m
2026-07-15 UAL1140 LAS → IAD Jul 15, 16:00 UTCJul 15, 20:15 UTC4h 15m
2026-07-15 UAL655 DEN → LAS Jul 15, 01:25 UTCJul 15, 02:55 UTC1h 30m
2026-07-14 UAL475 - Jul 14, 21:30 UTCJul 14, 23:50 UTC2h 19m
2026-07-14 UAL1029 DEN → YEG Jul 14, 17:45 UTCJul 14, 20:10 UTC2h 25m
2026-07-14 UAL1029 DEN → YEG Jul 14, 18:00 UTCJul 14, 20:10 UTC2h 10m
2026-07-14 UAL687 - Jul 14, 14:30 UTCJul 14, 15:15 UTC45m
2026-07-14 UAL687 DRO → DEN Jul 14, 14:10 UTCJul 14, 15:17 UTC1h 7m
2026-07-14 UAL1390 - Jul 14, 01:25 UTCJul 14, 02:05 UTC40m
2026-07-13 UAL719 SJC → DEN Jul 13, 21:35 UTCJul 13, 23:45 UTC2h 10m
2026-07-13 UAL2808 DEN → SJC Jul 13, 18:10 UTCJul 13, 20:10 UTC2h 0m
2026-07-13 UAL1727 BUF → DEN Jul 13, 13:10 UTCJul 13, 16:00 UTC2h 50m
2026-07-12 UAL248 DEN → BUF Jul 12, 23:55 UTCJul 13, 02:40 UTC2h 45m
2026-07-12 UAL478 - Jul 12, 20:30 UTCJul 12, 21:40 UTC1h 10m
2026-07-12 UAL478 BIL → DEN Jul 12, 20:42 UTCJul 12, 21:42 UTC1h 0m
2026-07-12 UAL703 - Jul 12, 18:05 UTCJul 12, 19:10 UTC1h 5m
2026-07-12 UAL703 DEN → BIL Jul 12, 18:07 UTCJul 12, 19:09 UTC1h 2m
2026-07-12 UAL1891 MSP → DEN Jul 12, 14:26 UTCJul 12, 15:50 UTC1h 24m
2026-07-12 UAL1891 MSP → DEN Jul 12, 14:20 UTCJul 12, 15:55 UTC1h 35m
2026-07-12 UAL667 DEN → MSP Jul 12, 03:20 UTCJul 12, 04:50 UTC1h 30m
2026-07-11 UAL566 SMF → DEN Jul 11, 23:25 UTCJul 12, 01:15 UTC1h 50m
2026-07-11 UAL662T DEN → SMF Jul 11, 19:55 UTCJul 11, 21:55 UTC2h 0m
2026-07-11 UAL779 AUS → DEN Jul 11, 16:40 UTCJul 11, 18:25 UTC1h 45m
2026-07-11 UAL8100 - Jul 11, 00:15 UTCJul 11, 00:50 UTC35m
2026-07-11 UAL8100 IAH → AUS Jul 11, 00:11 UTCJul 11, 00:48 UTC37m
2026-07-10 UAL1242 - Jul 10, 16:20 UTCJul 10, 22:30 UTC6h 10m
2026-07-10 UAL1935 - Jul 10, 10:40 UTCJul 10, 13:25 UTC2h 45m
2026-07-09 UAL2382 LAS → IAD Jul 9, 21:00 UTCJul 10, 00:55 UTC3h 55m
2026-07-09 UAL8210 - Jul 9, 16:45 UTCJul 9, 19:15 UTC2h 30m
2026-07-09 UAL8210 IAH → LAS Jul 9, 16:49 UTCJul 9, 19:10 UTC2h 21m
2026-07-09 UAL2228 - Jul 9, 13:50 UTCJul 9, 15:15 UTC1h 25m
2026-07-09 UAL1596 - Jul 9, 03:50 UTCJul 9, 05:10 UTC1h 20m
2026-07-09 UAL2395 - Jul 9, 00:00 UTCJul 9, 01:35 UTC1h 35m
2026-07-08 UAL267 - Jul 8, 21:40 UTCJul 8, 22:45 UTC1h 5m
2026-07-08 UAL1712 - Jul 8, 16:45 UTCJul 8, 20:00 UTC3h 15m
2026-07-08 UAL539 ORD → DFW Jul 8, 12:40 UTCJul 8, 14:25 UTC1h 45m
2026-07-08 UAL2768 LGA → ORD Jul 8, 03:25 UTCJul 8, 05:15 UTC1h 50m
2026-07-08 UAL1623 ORD → LGA Jul 8, 00:10 UTCJul 8, 01:40 UTC1h 30m
2026-07-07 UAL1180 DEN → CID Jul 7, 14:10 UTCJul 7, 21:30 UTC7h 20m
2026-07-07 UAL2752 - Jul 7, 11:15 UTCJul 7, 12:10 UTC55m
2026-07-07 UAL2148 ORD → CVG Jul 7, 03:25 UTCJul 7, 04:10 UTC45m
2026-07-07 UAL2148 ORD → CVG Jul 7, 03:11 UTCJul 7, 04:09 UTC58m

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 N73270 page for operator, model, and routing details .

Mode-S A9D5DF frequently asked

What is Mode-S code A9D5DF?
A9D5DF is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N73270.
Where is Mode-S A9D5DF registered?
Mode-S code A9D5DF 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 A9D5DF broadcasting right now?
No active broadcast right now. Last signal was 8h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A9D5DF, octal 52352737, decimal 11,130,335.
What flights does A9D5DF operate?
Mode-S A9D5DF has broadcast 20 distinct callsigns, including UAL1821, UAL1910, UAL1029, UAL671, UAL371.