Apparatus

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sensors Mode-S transponder

A12F72

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N17596 · BOEING 737 MAX 9 · operated by BANK OF UTAH TRUSTEE

Hex
A12F72
Octal
50227562
Decimal
10,563,442
Country
US
Tail
N17596
Type
B39M
No current signal · last broadcast Jul 26, 18:40 UTC
Flights observed
475
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 18:40 UTC

Last known position

Most recent position reported by Mode-S A12F72.

Country allocation

The ICAO 24-bit address A12F72 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
UAL356 United Airlines 6 2026-06-02
UAL492 United Airlines 5 2026-05-04
UAL2111 United Airlines 5 2026-07-26
UAL1724 - 5 2026-07-16
UAL1556 United Airlines 5 2026-06-11
UAL797 United Airlines 4 2026-04-15
UAL744 United Airlines 4 2026-07-24
UAL727 - 4 2026-06-25
UAL668 United Airlines 4 2026-06-11
UAL665 - 4 2026-07-11
UAL2452 United Airlines 4 2026-06-27
UAL2431 United Airlines 4 2026-05-14
UAL2400 United Airlines 4 2026-04-16
UAL2373 United Airlines 4 2026-05-14
UAL2372 United Airlines 4 2026-05-15
UAL2210 - 4 2026-07-10
UAL2002 - 4 2026-07-10
UAL1947 - 4 2026-07-18
UAL1723 - 4 2026-07-16
UAL1664 United Airlines 4 2026-06-08

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL1817 IAD → PLS Jul 26, 16:50 UTCJul 26, 18:40 UTC1h 50m
2026-07-26 UAL1709 EWR → MCO Jul 26, 13:40 UTCJul 26, 15:00 UTC1h 20m
2026-07-26 UAL1815 EWR → CLT Jul 26, 07:25 UTCJul 26, 11:15 UTC3h 50m
2026-07-26 UAL2111 EWR → BNA Jul 26, 00:05 UTCJul 26, 04:45 UTC4h 40m
2026-07-25 UAL1384 DEN → TPA Jul 25, 17:25 UTCJul 25, 22:25 UTC5h 0m
2026-07-25 UAL1384 DEN → TPA Jul 25, 17:24 UTCJul 25, 22:33 UTC5h 9m
2026-07-25 UAL2661 PHL → ORD Jul 25, 10:20 UTCJul 25, 15:40 UTC5h 20m
2026-07-25 UAL2619 DEN → MSP Jul 25, 00:55 UTCJul 25, 05:30 UTC4h 35m
2026-07-24 UAL1754 MSN → ORD Jul 24, 22:45 UTCJul 24, 23:55 UTC1h 10m
2026-07-24 UAL1754 MSN → ORD Jul 24, 21:58 UTCJul 24, 23:48 UTC1h 50m
2026-07-24 UAL337 DEN → DFW Jul 24, 17:50 UTCJul 24, 20:00 UTC2h 10m
2026-07-24 UAL690 SEA → SFO Jul 24, 13:10 UTCJul 24, 15:50 UTC2h 40m
2026-07-24 UAL744 IAD → EWR Jul 24, 00:00 UTCJul 24, 02:10 UTC2h 10m
2026-07-23 UAL1259 SJC → DEN Jul 23, 18:35 UTCJul 23, 22:00 UTC3h 25m
2026-07-23 UAL1768 EWR → DEN Jul 23, 12:45 UTCJul 23, 16:20 UTC3h 35m
2026-07-23 UAL1768 EWR → DEN Jul 23, 12:39 UTCJul 23, 16:14 UTC3h 35m
2026-07-22 UAL2741 IAD → EWR Jul 22, 23:00 UTCJul 23, 01:40 UTC2h 40m
2026-07-22 UAL2741 IAD → EWR Jul 22, 20:25 UTCJul 22, 21:10 UTC45m
2026-07-22 UAL1653 - Jul 22, 13:20 UTCJul 22, 17:30 UTC4h 10m
2026-07-22 UAL1145 SFO → CUN Jul 22, 07:18 UTCJul 22, 11:59 UTC4h 41m
2026-07-22 UAL1145 SFO → CUN Jul 22, 10:20 UTCJul 22, 12:00 UTC1h 40m
2026-07-22 UAL2777 EWR → TPA Jul 22, 00:20 UTCJul 22, 04:55 UTC4h 35m
2026-07-19 UAL2818 SFO → TPA Jul 19, 21:00 UTCJul 20, 01:50 UTC4h 50m
2026-07-19 UAL1550 - Jul 19, 15:15 UTCJul 19, 19:25 UTC4h 10m
2026-07-19 UAL1550 DTW → SFO Jul 19, 14:50 UTCJul 19, 19:20 UTC4h 30m
2026-07-19 UAL234 MSY → IAH Jul 19, 04:55 UTCJul 19, 08:55 UTC4h 0m
2026-07-18 UAL2462 YVR → SFO Jul 18, 22:10 UTCJul 19, 02:50 UTC4h 40m
2026-07-18 UAL2462 YVR → SFO Jul 18, 21:46 UTCJul 19, 02:45 UTC4h 59m
2026-07-18 UAL608 - Jul 18, 15:30 UTCJul 18, 19:45 UTC4h 15m
2026-07-18 UAL1947 - Jul 18, 06:15 UTCJul 18, 07:00 UTC45m
2026-07-18 UAL1947 - Jul 18, 02:25 UTCJul 18, 02:40 UTC15m
2026-07-18 UAL1260 SNA → SFO Jul 18, 00:39 UTCJul 18, 01:05 UTC25m
2026-07-17 UAL1260 SNA → SFO Jul 17, 20:10 UTCJul 17, 20:40 UTC30m
2026-07-17 UAL1668 AUS → SFO Jul 17, 13:55 UTCJul 17, 17:09 UTC3h 15m
2026-07-17 UAL1807 - Jul 17, 07:20 UTCJul 17, 10:30 UTC3h 10m
2026-07-16 UAL2810 - Jul 16, 23:55 UTCJul 17, 05:15 UTC5h 20m
2026-07-16 UAL2029 SFO → MIA Jul 16, 16:35 UTCJul 16, 21:40 UTC5h 5m
2026-07-16 UAL1724 - Jul 16, 12:49 UTCJul 16, 13:40 UTC50m
2026-07-16 UAL1724 - Jul 16, 09:00 UTCJul 16, 09:10 UTC10m
2026-07-16 UAL1723 - Jul 16, 04:50 UTCJul 16, 05:05 UTC15m
2026-07-16 UAL1723 - Jul 16, 00:10 UTCJul 16, 00:35 UTC25m
2026-07-15 UAL1321 - Jul 15, 21:05 UTCJul 15, 21:45 UTC40m
2026-07-15 UAL1321 - Jul 15, 17:10 UTCJul 15, 17:20 UTC10m
2026-07-15 UAL731 - Jul 15, 07:35 UTCJul 15, 07:55 UTC20m
2026-07-15 UAL731 - Jul 15, 02:55 UTCJul 15, 03:30 UTC35m
2026-07-15 UAL731 SFO → KOA Jul 15, 02:57 UTCJul 15, 08:01 UTC5h 4m
2026-07-14 UAL2862 IAD → SFO Jul 14, 19:12 UTCJul 14, 23:42 UTC4h 30m
2026-07-14 UAL2862 - Jul 14, 19:00 UTCJul 14, 23:40 UTC4h 39m
2026-07-14 UAL2066 - Jul 14, 15:25 UTCJul 14, 16:05 UTC40m
2026-07-14 UAL2112 IAD → ORF Jul 14, 12:40 UTCJul 14, 13:20 UTC40m

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 N17596 page for operator, model, and routing details .

Mode-S A12F72 frequently asked

What is Mode-S code A12F72?
A12F72 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N17596.
Where is Mode-S A12F72 registered?
Mode-S code A12F72 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 A12F72 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 18:40 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A12F72, octal 50227562, decimal 10,563,442.
What flights does A12F72 operate?
Mode-S A12F72 has broadcast 20 distinct callsigns, including UAL356, UAL492, UAL2111, UAL1724, UAL1556.