Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A12F52

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N17589 · BOEING 737 MAX 9 · operated by BANK OF UTAH TRUSTEE

Hex
A12F52
Octal
50227522
Decimal
10,563,410
Country
US
Tail
N17589
Type
B39M
No current signal · last broadcast Jul 26, 22:30 UTC
Flights observed
455
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:30 UTC

Last known position

Most recent position reported by Mode-S A12F52.

Country allocation

The ICAO 24-bit address A12F52 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
UAL432 - 5 2026-07-06
UAL1556 - 5 2026-07-02
UAL1467 United Airlines 5 2026-06-12
UAL668 - 4 2026-07-02
UAL2387 - 4 2026-07-01
UAL2381 - 4 2026-07-17
UAL2372 United Airlines 4 2026-05-29
UAL2294 United Airlines 4 2026-04-18
UAL1948 United Airlines 4 2026-04-15
UAL1826 - 4 2026-07-18
UAL1817 - 4 2026-07-19
UAL1670 - 4 2026-07-21
UAL1461 - 4 2026-07-21
UAL1437 United Airlines 4 2026-06-16
UAL1276 - 4 2026-07-21
UAL1266 United Airlines 4 2026-06-12
UAL1163 United Airlines 4 2026-06-05
UAL787 United Airlines 3 2026-04-17
UAL747 United Airlines 3 2026-04-14
UAL679 - 3 2026-04-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL3776 DFW → ORD Jul 26, 22:20 UTCJul 26, 22:30 UTC10m
2026-07-26 UAL3754 LAX → IAD Jul 26, 18:51 UTCJul 26, 19:16 UTC25m
2026-07-26 UAL3754 LAX → IAD Jul 26, 18:40 UTCJul 26, 19:15 UTC35m
2026-07-26 UAL1858 IAD → AUS Jul 26, 14:05 UTCJul 26, 14:30 UTC25m
2026-07-26 UAL1858 IAD → AUS Jul 26, 14:13 UTCJul 26, 15:10 UTC57m
2026-07-26 UAL2355 PHX → IAH Jul 26, 11:00 UTCJul 26, 12:30 UTC1h 30m
2026-07-26 UAL1053 CUN → EWR Jul 26, 01:25 UTCJul 26, 04:40 UTC3h 15m
2026-07-26 UAL1053 CUN → EWR Jul 26, 01:29 UTCJul 26, 04:34 UTC3h 5m
2026-07-25 UAL1020 IAD → EWR Jul 25, 22:20 UTCJul 26, 00:05 UTC1h 45m
2026-07-25 UAL277 IAD → SFO Jul 25, 17:35 UTCJul 25, 20:35 UTC3h 0m
2026-07-25 UAL446 MCO → EWR Jul 25, 15:15 UTCJul 25, 16:00 UTC45m
2026-07-25 UAL2315 BOS → ORD Jul 25, 06:20 UTCJul 25, 07:00 UTC40m
2026-07-25 UAL298 AUS → EWR Jul 25, 03:35 UTCJul 25, 04:35 UTC1h 0m
2026-07-25 UAL233 DEN → SFO Jul 25, 00:35 UTCJul 25, 01:30 UTC55m
2026-07-24 UAL2610 IAD → PDX Jul 24, 21:35 UTCJul 24, 22:30 UTC55m
2026-07-24 UAL2017 IAH → BOS Jul 24, 14:45 UTCJul 24, 19:35 UTC4h 50m
2026-07-24 UAL8255 YVR → SFO Jul 24, 07:45 UTCJul 24, 10:30 UTC2h 45m
2026-07-24 UAL8255 YVR → SFO Jul 24, 07:33 UTCJul 24, 12:36 UTC5h 3m
2026-07-24 UAL2810 MIA → SFO Jul 24, 00:35 UTCJul 24, 05:45 UTC5h 10m
2026-07-23 UAL2810 MIA → SFO Jul 23, 23:49 UTCJul 24, 05:43 UTC5h 54m
2026-07-23 UAL2029 ORD → RIC Jul 23, 16:10 UTCJul 23, 21:35 UTC5h 25m
2026-07-23 UAL643 KOA → SFO Jul 23, 13:10 UTCJul 23, 14:15 UTC1h 5m
2026-07-23 UAL406 DEN → LGA Jul 23, 04:30 UTCJul 23, 05:40 UTC1h 10m
2026-07-23 UAL1656 ORD → CUN Jul 23, 01:45 UTCJul 23, 03:15 UTC1h 30m
2026-07-22 UAL2851 BUR → SFO Jul 22, 23:15 UTCJul 23, 00:25 UTC1h 10m
2026-07-22 UAL2428 - Jul 22, 20:50 UTCJul 22, 21:55 UTC1h 5m
2026-07-22 UAL1930 IAD → SAN Jul 22, 14:50 UTCJul 22, 19:35 UTC4h 45m
2026-07-22 UAL2131 PBI → EWR Jul 22, 03:05 UTCJul 22, 03:55 UTC50m
2026-07-22 UAL2131 PBI → EWR Jul 22, 02:50 UTCJul 22, 03:54 UTC1h 4m
2026-07-21 UAL1133 CUN → IAD Jul 21, 21:30 UTCJul 22, 00:50 UTC3h 20m
2026-07-21 UAL1276 - Jul 21, 15:45 UTCJul 21, 20:00 UTC4h 15m
2026-07-21 UAL1670 - Jul 21, 08:15 UTCJul 21, 12:45 UTC4h 30m
2026-07-21 UAL1461 - Jul 21, 00:30 UTCJul 21, 02:45 UTC2h 15m
2026-07-20 UAL2086 - Jul 20, 19:05 UTCJul 20, 22:05 UTC3h 0m
2026-07-20 UAL1734 - Jul 20, 12:30 UTCJul 20, 16:55 UTC4h 25m
2026-07-19 UAL1820 PLS → IAD Jul 19, 23:00 UTCJul 19, 23:55 UTC55m
2026-07-19 UAL1817 - Jul 19, 16:50 UTCJul 19, 18:25 UTC1h 35m
2026-07-19 UAL1817 IAD → PLS Jul 19, 16:55 UTCJul 19, 19:35 UTC2h 40m
2026-07-19 UAL2331 TPA → IAD Jul 19, 13:10 UTCJul 19, 14:55 UTC1h 45m
2026-07-18 UAL2865 ORD → TPA Jul 18, 23:25 UTCJul 19, 01:40 UTC2h 15m
2026-07-18 UAL1710 - Jul 18, 18:00 UTCJul 18, 21:40 UTC3h 40m
2026-07-18 UAL1710 SAN → ORD Jul 18, 17:52 UTCJul 18, 21:25 UTC3h 33m
2026-07-18 UAL1826 EWR → SAN Jul 18, 10:55 UTCJul 18, 15:45 UTC4h 50m
2026-07-18 UAL1162 BQN → EWR Jul 18, 04:49 UTCJul 18, 08:19 UTC3h 30m
2026-07-18 UAL569 - Jul 18, 00:04 UTCJul 18, 03:10 UTC3h 6m
2026-07-17 UAL2381 - Jul 17, 14:15 UTCJul 17, 19:09 UTC4h 55m
2026-07-17 UAL2381 SAN → EWR Jul 17, 14:02 UTCJul 17, 19:04 UTC5h 2m
2026-07-17 UAL2407 - Jul 17, 01:45 UTCJul 17, 04:35 UTC2h 50m
2026-07-17 UAL2407 IAH → SAN Jul 17, 01:23 UTCJul 17, 04:31 UTC3h 8m
2026-07-16 UAL1867 - Jul 16, 21:05 UTCJul 16, 23:25 UTC2h 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 N17589 page for operator, model, and routing details .

Mode-S A12F52 frequently asked

What is Mode-S code A12F52?
A12F52 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N17589.
Where is Mode-S A12F52 registered?
Mode-S code A12F52 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 A12F52 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:30 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A12F52, octal 50227522, decimal 10,563,410.
What flights does A12F52 operate?
Mode-S A12F52 has broadcast 20 distinct callsigns, including UAL432, UAL1556, UAL1467, UAL668, UAL2387.