Apparatus

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sensors Mode-S transponder

A12A7F

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N17405 · operated by UMB BANK NA TRUSTEE

Hex
A12A7F
Octal
50225177
Decimal
10,562,175
Country
US
Tail
N17405
Type
B39M
Broadcasting now · callsign UAL1783 · 9,950 ft
Flights observed
450
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 03:00 UTC

Current position

A12A7F is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A12A7F 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
UAL727 - 5 2026-06-20
UAL595 - 5 2026-06-25
UAL2428 United Airlines 5 2026-07-25
UAL1938 United Airlines 5 2026-05-26
UAL1572 United Airlines 5 2026-06-14
UAL465 - 4 2026-07-18
UAL2661 United Airlines 4 2026-07-21
UAL2619 - 4 2026-07-21
UAL2373 - 4 2026-07-11
UAL2372 - 4 2026-07-12
UAL2198 United Airlines 4 2026-05-06
UAL1768 United Airlines 4 2026-05-15
UAL1754 United Airlines 4 2026-07-20
UAL1581 United Airlines 4 2026-06-13
UAL1467 - 4 2026-07-12
UAL1266 - 4 2026-07-12
UAL8261 United Airlines 3 2026-04-17
UAL755 - 3 2026-07-19
UAL619 United Airlines 3 2026-04-15
UAL552 - 3 2026-07-09

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 UAL2851 BUR → SFO Jul 25, 22:05 UTCJul 26, 03:00 UTC4h 55m
2026-07-25 UAL2851 BUR → SFO Jul 25, 22:09 UTCJul 26, 02:57 UTC4h 48m
2026-07-25 UAL2428 PHX → EWR Jul 25, 19:05 UTCJul 25, 20:10 UTC1h 5m
2026-07-25 UAL1930 MIA → EWR Jul 25, 12:25 UTCJul 25, 17:10 UTC4h 45m
2026-07-25 UAL1930 MIA → EWR Jul 25, 12:33 UTCJul 25, 17:12 UTC4h 39m
2026-07-25 UAL8150 YYZ → CLT Jul 25, 00:35 UTCJul 25, 04:55 UTC4h 20m
2026-07-25 UAL8150 YYZ → CLT Jul 25, 00:40 UTCJul 25, 04:53 UTC4h 13m
2026-07-24 UAL2077 PBI → EWR Jul 24, 22:10 UTCJul 24, 23:20 UTC1h 10m
2026-07-24 UAL318 EWR → DEN Jul 24, 17:55 UTCJul 24, 20:05 UTC2h 10m
2026-07-24 UAL2167 ORD → CVG Jul 24, 12:20 UTCJul 24, 15:30 UTC3h 10m
2026-07-24 UAL2865 DEN → ORD Jul 24, 00:15 UTCJul 24, 02:15 UTC2h 0m
2026-07-23 UAL1475 EWR → RSW Jul 23, 19:55 UTCJul 23, 22:10 UTC2h 15m
2026-07-23 UAL1606 SFO → ORD Jul 23, 16:35 UTCJul 23, 18:30 UTC1h 55m
2026-07-23 UAL1640 EWR → CHS Jul 23, 09:25 UTCJul 23, 14:45 UTC5h 20m
2026-07-23 UAL2223 CPT → IAD Jul 23, 01:18 UTCJul 23, 07:53 UTC6h 35m
2026-07-23 UAL2223 CPT → IAD Jul 23, 01:10 UTCJul 23, 08:00 UTC6h 50m
2026-07-22 UAL2825 ORD → PHL Jul 22, 18:20 UTCJul 22, 18:40 UTC20m
2026-07-22 UAL2825 ORD → PHL Jul 22, 16:35 UTCJul 22, 18:40 UTC2h 5m
2026-07-22 UAL2825 ORD → PHL Jul 22, 16:50 UTCJul 22, 18:04 UTC1h 14m
2026-07-22 UAL2034 - Jul 22, 12:50 UTCJul 22, 14:15 UTC1h 25m
2026-07-22 UAL2229 EWR → SRQ Jul 22, 03:10 UTCJul 22, 05:25 UTC2h 15m
2026-07-22 UAL2229 EWR → SRQ Jul 22, 02:56 UTCJul 22, 05:11 UTC2h 15m
2026-07-21 UAL2356 BUR → SFO Jul 21, 20:40 UTCJul 22, 01:40 UTC5h 0m
2026-07-21 UAL2661 PHL → ORD Jul 21, 10:20 UTCJul 21, 15:40 UTC5h 20m
2026-07-21 UAL2619 SFO → PHL Jul 21, 00:41 UTCJul 21, 05:24 UTC4h 43m
2026-07-21 UAL2619 SFO → PHL Jul 21, 00:50 UTCJul 21, 05:25 UTC4h 35m
2026-07-20 UAL1754 MSN → ORD Jul 20, 22:00 UTCJul 20, 23:15 UTC1h 15m
2026-07-20 UAL337 DEN → MFR Jul 20, 17:55 UTCJul 20, 19:55 UTC2h 0m
2026-07-20 UAL2052 IAH → MSY Jul 20, 12:00 UTCJul 20, 15:40 UTC3h 40m
2026-07-20 UAL2254 - Jul 20, 00:55 UTCJul 20, 04:05 UTC3h 10m
2026-07-19 UAL1263 - Jul 19, 20:40 UTCJul 19, 22:35 UTC1h 55m
2026-07-19 UAL2661 PHL → ORD Jul 19, 18:30 UTCJul 19, 19:25 UTC55m
2026-07-19 UAL2661 PHL → ORD Jul 19, 18:06 UTCJul 19, 19:26 UTC1h 20m
2026-07-19 UAL2441 BOS → SFO Jul 19, 10:20 UTCJul 19, 16:05 UTC5h 45m
2026-07-19 UAL755 IAD → BOS Jul 19, 06:25 UTCJul 19, 07:35 UTC1h 10m
2026-07-19 UAL755 IAD → BOS Jul 19, 06:06 UTCJul 19, 07:33 UTC1h 27m
2026-07-18 UAL1648 AUA → IAD Jul 18, 21:50 UTCJul 19, 01:45 UTC3h 55m
2026-07-18 UAL1648 AUA → IAD Jul 18, 21:49 UTCJul 19, 01:43 UTC3h 54m
2026-07-18 UAL1804 - Jul 18, 14:55 UTCJul 18, 19:05 UTC4h 10m
2026-07-18 UAL2358 SAN → EWR Jul 18, 11:15 UTCJul 18, 13:05 UTC1h 50m
2026-07-18 UAL465 - Jul 18, 01:15 UTCJul 18, 03:10 UTC1h 56m
2026-07-18 UAL465 IAH → IND Jul 18, 01:17 UTCJul 18, 03:08 UTC1h 51m
2026-07-17 UAL1387 - Jul 17, 19:35 UTCJul 17, 23:10 UTC3h 35m
2026-07-17 UAL2744 MCO → EWR Jul 17, 13:40 UTCJul 17, 17:15 UTC3h 35m
2026-07-17 UAL2379 ORF → EWR Jul 17, 08:04 UTCJul 17, 12:00 UTC3h 55m
2026-07-17 UAL2456 LAX → EWR Jul 17, 01:29 UTCJul 17, 05:30 UTC4h 0m
2026-07-16 UAL1019 - Jul 16, 20:35 UTCJul 16, 22:30 UTC1h 55m
2026-07-16 UAL1016 - Jul 16, 17:10 UTCJul 16, 18:59 UTC1h 50m
2026-07-16 UAL2417 - Jul 16, 13:00 UTCJul 16, 15:05 UTC2h 5m
2026-07-15 UAL2740 - Jul 15, 22:25 UTCJul 16, 00:25 UTC2h 0m

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 N17405 page for operator, model, and routing details .

Mode-S A12A7F frequently asked

What is Mode-S code A12A7F?
A12A7F is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N17405.
Where is Mode-S A12A7F registered?
Mode-S code A12A7F 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 A12A7F broadcasting right now?
Yes. Mode-S A12A7F is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A12A7F, octal 50225177, decimal 10,562,175.
What flights does A12A7F operate?
Mode-S A12A7F has broadcast 20 distinct callsigns, including UAL727, UAL595, UAL2428, UAL1938, UAL1572.