Apparatus

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sensors Mode-S transponder

A12734

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N17338 · BOEING 737 MAX 8 · operated by UMB BANK NA TRUSTEE

Hex
A12734
Octal
50223464
Decimal
10,561,332
Country
US
Tail
N17338
Type
B38M
No current signal · last broadcast Jul 26, 00:15 UTC
Flights observed
442
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 00:15 UTC

Last known position

Most recent position reported by Mode-S A12734.

Country allocation

The ICAO 24-bit address A12734 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
UAL2153 - 5 2026-07-10
UAL1676 - 5 2026-07-01
UAL840 United Airlines 4 2026-06-01
UAL677 United Airlines 4 2026-05-18
UAL637 - 4 2026-06-15
UAL363 United Airlines 4 2026-06-05
UAL2623 - 4 2026-06-22
UAL2384 - 4 2026-06-25
UAL1632 - 4 2026-07-16
UAL1560 United Airlines 4 2026-05-22
UAL1446 United Airlines 4 2026-04-15
UAL1378 - 4 2026-07-15
UAL1299 - 4 2026-06-22
UAL1080 United Airlines 4 2026-05-22
UAL1065 United Airlines 4 2026-06-03
UAL794 United Airlines 3 2026-05-18
UAL628 - 3 2026-07-10
UAL587 United Airlines 3 2026-05-14
UAL573 - 3 2026-07-09
UAL572 - 3 2026-06-27

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 UAL474 MEX → ORD Jul 25, 20:30 UTCJul 26, 00:10 UTC3h 40m
2026-07-25 UAL359 ORD → MEX Jul 25, 18:35 UTCJul 25, 18:50 UTC15m
2026-07-25 UAL359 ORD → MEX Jul 25, 15:15 UTCJul 25, 17:55 UTC2h 40m
2026-07-25 UAL1113 ORD → MSP Jul 25, 10:25 UTCJul 25, 12:50 UTC2h 25m
2026-07-25 UAL1113 ORD → MSP Jul 25, 10:18 UTCJul 25, 12:26 UTC2h 8m
2026-07-25 UAL1401 AUS → SFO Jul 25, 01:00 UTCJul 25, 02:40 UTC1h 40m
2026-07-25 UAL1401 AUS → SFO Jul 25, 01:12 UTCJul 25, 02:43 UTC1h 31m
2026-07-23 UAL2766 HKG → ORD Jul 23, 21:35 UTCJul 24, 01:15 UTC3h 40m
2026-07-23 UAL1415 IAH → MSY Jul 23, 17:55 UTCJul 23, 20:00 UTC2h 5m
2026-07-23 UAL2307 DEN → LIH Jul 23, 12:15 UTCJul 23, 15:50 UTC3h 35m
2026-07-23 UAL1214 DEN → EWR Jul 23, 07:05 UTCJul 23, 10:00 UTC2h 55m
2026-07-23 UAL2436 DEN → MSY Jul 23, 03:45 UTCJul 23, 05:45 UTC2h 0m
2026-07-22 UAL1726 ORD → ALB Jul 22, 15:40 UTCJul 23, 02:40 UTC11h 0m
2026-07-22 UAL1750 PHX → EWR Jul 22, 11:30 UTCJul 22, 12:10 UTC40m
2026-07-22 UAL1749 SFO → OGG Jul 22, 00:15 UTCJul 22, 00:45 UTC30m
2026-07-21 UAL2313 ORD → IAH Jul 21, 15:05 UTCJul 21, 20:55 UTC5h 50m
2026-07-21 UAL2312 SFO → DEN Jul 21, 07:15 UTCJul 21, 13:30 UTC6h 15m
2026-07-21 UAL2482 - Jul 21, 01:35 UTCJul 21, 05:15 UTC3h 40m
2026-07-20 UAL2090 IAH → PHL Jul 20, 19:47 UTCJul 20, 23:04 UTC3h 17m
2026-07-20 UAL2090 IAH → PHL Jul 20, 19:40 UTCJul 20, 23:10 UTC3h 30m
2026-07-20 UAL520 - Jul 20, 16:45 UTCJul 20, 17:40 UTC55m
2026-07-20 UAL1612 LIH → LAX Jul 20, 08:13 UTCJul 20, 13:25 UTC5h 12m
2026-07-20 UAL1104 SJC → DEN Jul 20, 00:35 UTCJul 20, 01:35 UTC1h 0m
2026-07-19 UAL2184 - Jul 19, 22:05 UTCJul 19, 22:45 UTC40m
2026-07-19 UAL1524 IAH → EWR Jul 19, 17:25 UTCJul 19, 19:50 UTC2h 25m
2026-07-19 UAL1533 - Jul 19, 01:10 UTCJul 19, 14:55 UTC13h 45m
2026-07-18 UAL2617 SFO → LAX Jul 18, 20:10 UTCJul 18, 23:20 UTC3h 10m
2026-07-17 UAL1579 DEN → LGA Jul 17, 20:25 UTCJul 17, 23:39 UTC3h 15m
2026-07-17 UAL2246 CLE → DEN Jul 17, 15:20 UTCJul 17, 17:50 UTC2h 30m
2026-07-17 UAL2246 CLE → DEN Jul 17, 15:22 UTCJul 17, 17:52 UTC2h 30m
2026-07-17 UAL1833 EWR → CLE Jul 17, 12:55 UTCJul 17, 13:55 UTC1h 0m
2026-07-17 UAL258 GUA → EWR Jul 17, 05:04 UTCJul 17, 09:16 UTC4h 12m
2026-07-17 UAL258 - Jul 17, 05:04 UTCJul 17, 08:59 UTC3h 55m
2026-07-16 UAL1632 - Jul 16, 22:10 UTCJul 16, 22:19 UTC10m
2026-07-16 UAL1632 - Jul 16, 19:55 UTCJul 16, 20:25 UTC30m
2026-07-16 UAL1632 IAH → GUA Jul 16, 20:02 UTCJul 16, 22:17 UTC2h 15m
2026-07-16 UAL8123 LGA → IAH Jul 16, 14:38 UTCJul 16, 17:32 UTC2h 54m
2026-07-16 UAL8123 - Jul 16, 14:35 UTCJul 16, 17:35 UTC3h 0m
2026-07-15 UAL2168 DEN → LGA Jul 15, 22:15 UTCJul 16, 01:35 UTC3h 20m
2026-07-15 UAL2663 - Jul 15, 19:30 UTCJul 15, 19:55 UTC25m
2026-07-15 UAL1378 DEN → EGE Jul 15, 17:38 UTCJul 15, 17:49 UTC11m
2026-07-15 UAL1378 - Jul 15, 17:25 UTCJul 15, 17:40 UTC15m
2026-07-15 UAL1716 BNA → DEN Jul 15, 12:10 UTCJul 15, 14:15 UTC2h 5m
2026-07-14 UAL1300 DEN → BNA Jul 14, 23:53 UTCJul 15, 02:03 UTC2h 10m
2026-07-14 UAL1300 DEN → BNA Jul 14, 23:55 UTCJul 15, 02:05 UTC2h 10m
2026-07-14 UAL2132 - Jul 14, 20:20 UTCJul 14, 22:15 UTC1h 55m
2026-07-14 UAL643 - Jul 14, 17:40 UTCJul 14, 18:45 UTC1h 5m
2026-07-14 UAL1372 - Jul 14, 15:25 UTCJul 14, 16:15 UTC50m
2026-07-14 UAL1372 LAX → SFO Jul 14, 14:49 UTCJul 14, 16:08 UTC1h 19m
2026-07-14 UAL1612 - Jul 14, 08:10 UTCJul 14, 13:15 UTC5h 5m

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 N17338 page for operator, model, and routing details .

Mode-S A12734 frequently asked

What is Mode-S code A12734?
A12734 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N17338.
Where is Mode-S A12734 registered?
Mode-S code A12734 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 A12734 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 00:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A12734, octal 50223464, decimal 10,561,332.
What flights does A12734 operate?
Mode-S A12734 has broadcast 20 distinct callsigns, including UAL2153, UAL1676, UAL840, UAL677, UAL637.