Apparatus

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sensors Mode-S transponder

A12A7B

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N17401 · operated by UMB BANK NA TRUSTEE

Hex
A12A7B
Octal
50225173
Decimal
10,562,171
Country
US
Tail
N17401
Type
B39M
No current signal · last broadcast Jul 26, 21:55 UTC
Flights observed
460
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:55 UTC

Last known position

Most recent position reported by Mode-S A12A7B.

Country allocation

The ICAO 24-bit address A12A7B 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
UAL1053 - 7 2026-07-16
UAL1215 - 6 2026-06-22
UAL1021 United Airlines 6 2026-05-21
UAL420 - 5 2026-07-19
UAL2848 - 5 2026-07-08
UAL1988 United Airlines 5 2026-05-17
UAL1490 - 5 2026-06-22
UAL535 United Airlines 4 2026-07-26
UAL371 - 4 2026-07-09
UAL2330 United Airlines 4 2026-05-29
UAL2168 - 4 2026-07-04
UAL1948 - 4 2026-07-17
UAL1947 - 4 2026-06-29
UAL1466 United Airlines 4 2026-05-01
UAL1177 - 4 2026-07-16
UAL1167 - 4 2026-07-05
UAL1052 - 4 2026-07-17
UAL1020 United Airlines 4 2026-05-16
UAL672 United Airlines 3 2026-04-14
UAL630T United Airlines 3 2026-06-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL2756 SFO → ORD Jul 26, 18:35 UTCJul 26, 21:55 UTC3h 20m
2026-07-26 UAL535 BOS → EWR Jul 26, 14:20 UTCJul 26, 16:15 UTC1h 55m
2026-07-26 UAL535 BOS → EWR Jul 26, 14:21 UTCJul 26, 16:14 UTC1h 53m
2026-07-26 UAL215 IAD → SFO Jul 26, 10:30 UTCJul 26, 12:25 UTC1h 55m
2026-07-25 UAL636 CHS → EWR Jul 25, 23:52 UTCJul 26, 01:10 UTC1h 18m
2026-07-25 UAL636 CHS → EWR Jul 25, 23:35 UTCJul 26, 01:10 UTC1h 35m
2026-07-25 UAL1475 EWR → RSW Jul 25, 19:25 UTCJul 25, 21:35 UTC2h 10m
2026-07-25 UAL1606 SFO → ORD Jul 25, 15:55 UTCJul 25, 17:50 UTC1h 55m
2026-07-25 UAL1150 PHX → EWR Jul 25, 11:20 UTCJul 25, 13:40 UTC2h 20m
2026-07-24 UAL1571 IAH → BOS Jul 24, 22:05 UTCJul 25, 00:00 UTC1h 55m
2026-07-24 UAL1795 DEN → CLE Jul 24, 17:40 UTCJul 24, 20:05 UTC2h 25m
2026-07-24 UAL2469 - Jul 24, 13:20 UTCJul 24, 15:35 UTC2h 15m
2026-07-24 UAL265 ABQ → ORD Jul 24, 00:10 UTCJul 24, 03:05 UTC2h 55m
2026-07-23 UAL1611 LAX → SFO Jul 23, 17:15 UTCJul 23, 19:45 UTC2h 30m
2026-07-23 UAL2444 EWR → FLL Jul 23, 12:59 UTCJul 23, 15:44 UTC2h 45m
2026-07-23 UAL2444 EWR → FLL Jul 23, 13:10 UTCJul 23, 15:50 UTC2h 40m
2026-07-23 UAL1802 IAH → BOS Jul 23, 06:00 UTCJul 23, 10:15 UTC4h 15m
2026-07-22 UAL780 IAD → LAS Jul 22, 22:00 UTCJul 23, 03:25 UTC5h 25m
2026-07-22 UAL2125 BNA → IAD Jul 22, 18:45 UTCJul 22, 20:05 UTC1h 20m
2026-07-22 UAL2414 IAH → SFO Jul 22, 16:15 UTCJul 22, 17:20 UTC1h 5m
2026-07-22 UAL752 - Jul 22, 11:40 UTCJul 22, 14:20 UTC2h 40m
2026-07-22 UAL752 FLL → ORD Jul 22, 11:19 UTCJul 22, 14:01 UTC2h 42m
2026-07-21 UAL2294 AUS → EWR Jul 21, 23:30 UTCJul 22, 01:55 UTC2h 25m
2026-07-21 UAL2294 AUS → EWR Jul 21, 23:32 UTCJul 22, 01:54 UTC2h 22m
2026-07-21 UAL1710 JAX → ORD Jul 21, 18:05 UTCJul 21, 21:50 UTC3h 45m
2026-07-21 UAL2428 - Jul 21, 12:20 UTCJul 21, 15:55 UTC3h 35m
2026-07-21 UAL651 SAN → SFO Jul 21, 01:25 UTCJul 21, 04:10 UTC2h 45m
2026-07-20 UAL2635 ORD → FLL Jul 20, 21:15 UTCJul 20, 23:45 UTC2h 30m
2026-07-20 UAL426 - Jul 20, 15:10 UTCJul 20, 16:00 UTC50m
2026-07-20 UAL426 DTW → ORD Jul 20, 15:18 UTCJul 20, 15:42 UTC24m
2026-07-20 UAL1344 - Jul 20, 12:50 UTCJul 20, 13:40 UTC50m
2026-07-20 UAL546 EWR → ORD Jul 20, 03:55 UTCJul 20, 05:45 UTC1h 50m
2026-07-19 UAL1526 PUJ → EWR Jul 19, 21:03 UTCJul 20, 00:23 UTC3h 20m
2026-07-19 UAL420 - Jul 19, 15:25 UTCJul 20, 00:20 UTC8h 55m
2026-07-19 UAL2670 ORD → CLE Jul 19, 12:10 UTCJul 19, 12:55 UTC45m
2026-07-19 UAL8135 CLE → YYZ Jul 19, 00:35 UTCJul 19, 00:45 UTC10m
2026-07-19 UAL8135 CLE → YYZ Jul 19, 00:39 UTCJul 19, 01:15 UTC36m
2026-07-18 UAL1387 - Jul 18, 19:45 UTCJul 18, 23:10 UTC3h 25m
2026-07-18 UAL1387 SFO → IAH Jul 18, 19:37 UTCJul 18, 23:08 UTC3h 31m
2026-07-18 UAL520 - Jul 18, 16:30 UTCJul 18, 17:20 UTC50m
2026-07-18 UAL2096 - Jul 18, 13:40 UTCJul 18, 14:45 UTC1h 5m
2026-07-18 UAL8288 YYZ → YOW Jul 18, 04:25 UTCJul 18, 05:20 UTC55m
2026-07-18 UAL1427 - Jul 18, 02:00 UTCJul 18, 03:00 UTC1h 1m
2026-07-17 UAL1948 CUN → SFO Jul 17, 18:16 UTCJul 17, 23:19 UTC5h 3m
2026-07-17 UAL1948 CUN → SFO Jul 17, 18:19 UTCJul 17, 23:20 UTC5h 0m
2026-07-17 UAL1052 EWR → CUN Jul 17, 13:05 UTCJul 17, 16:19 UTC3h 14m
2026-07-17 UAL1052 - Jul 17, 13:00 UTCJul 17, 14:44 UTC1h 45m
2026-07-16 UAL1053 CUN → EWR Jul 16, 21:10 UTCJul 17, 02:15 UTC5h 5m
2026-07-16 UAL1053 CUN → EWR Jul 16, 21:05 UTCJul 17, 02:12 UTC5h 7m
2026-07-16 UAL1177 DEN → CUN Jul 16, 15:55 UTCJul 16, 19:25 UTC3h 30m

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 N17401 page for operator, model, and routing details .

Mode-S A12A7B frequently asked

What is Mode-S code A12A7B?
A12A7B is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N17401.
Where is Mode-S A12A7B registered?
Mode-S code A12A7B 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 A12A7B broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:55 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A12A7B, octal 50225173, decimal 10,562,171.
What flights does A12A7B operate?
Mode-S A12A7B has broadcast 20 distinct callsigns, including UAL1053, UAL1215, UAL1021, UAL420, UAL2848.