Apparatus

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sensors Mode-S transponder

A59601

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N45905 · BOEING 787-8 Dreamliner · operated by UNITED AIRLINES INC, ATTN TREASURER

Hex
A59601
Octal
51313001
Decimal
10,851,841
Country
US
Tail
N45905
Type
B788
Broadcasting now · callsign UAL109 · 28,975 ft
Flights observed
253
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 11:10 UTC

Current position

A59601 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A59601 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
UAL997 United Airlines 31 2026-07-25
UAL613 - 22 2026-07-09
UAL996 United Airlines 21 2026-07-24
UAL612 - 18 2026-07-08
UAL981 - 13 2026-07-16
UAL770 - 13 2026-07-15
UAL980 - 11 2026-07-16
UAL952 United Airlines 11 2026-07-20
UAL769 - 11 2026-07-15
UAL109 United Airlines 11 2026-07-23
UAL909 - 10 2026-07-21
UAL908 United Airlines 10 2026-07-21
UAL345 United Airlines 9 2026-07-25
UAL108 - 9 2026-07-19
UAL982 - 8 2026-07-05
UAL953 United Airlines 8 2026-07-22
UAL1147 United Airlines 8 2026-05-28
UAL344 United Airlines 7 2026-07-26
UAL983 - 6 2026-07-05
UAL1791 United Airlines 3 2026-05-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL344 HNL → IAD Jul 26, 06:00 UTCJul 26, 11:05 UTC5h 6m
2026-07-25 UAL345 IAD → HNL Jul 25, 13:00 UTCJul 25, 22:15 UTC9h 15m
2026-07-25 UAL997 ACC → IAD Jul 25, 00:35 UTCJul 25, 08:50 UTC8h 15m
2026-07-24 UAL997 ACC → IAD Jul 24, 06:20 UTCJul 25, 01:30 UTC19h 10m
2026-07-24 UAL996 IAD → ACC Jul 24, 06:00 UTCJul 25, 01:30 UTC19h 30m
2026-07-23 UAL996 IAD → ACC Jul 23, 23:15 UTCJul 24, 07:00 UTC7h 45m
2026-07-23 UAL109 EDI → EWR Jul 23, 10:30 UTCJul 23, 18:50 UTC8h 20m
2026-07-22 UAL953 ORD → MUC Jul 22, 23:30 UTCJul 23, 07:20 UTC7h 50m
2026-07-21 UAL908 AMS → ORD Jul 21, 10:40 UTCJul 21, 18:45 UTC8h 5m
2026-07-21 UAL909 - Jul 21, 00:30 UTCJul 21, 07:40 UTC7h 10m
2026-07-20 UAL952 MUC → ORD Jul 20, 09:45 UTCJul 20, 18:35 UTC8h 50m
2026-07-19 UAL108 - Jul 19, 22:10 UTCJul 20, 05:40 UTC7h 30m
2026-07-19 UAL109 - Jul 19, 12:00 UTCJul 19, 18:55 UTC6h 55m
2026-07-19 UAL109 - Jul 19, 10:25 UTCJul 19, 11:55 UTC1h 30m
2026-07-19 UAL109 MUC → IAD Jul 19, 10:19 UTCJul 19, 18:51 UTC8h 32m
2026-07-18 UAL953 ORD → MUC Jul 18, 23:30 UTCJul 19, 07:25 UTC7h 55m
2026-07-18 UAL908 - Jul 18, 10:25 UTCJul 18, 18:20 UTC7h 55m
2026-07-18 UAL909 - Jul 18, 00:10 UTCJul 18, 07:20 UTC7h 11m
2026-07-16 UAL981 DUB → ORD Jul 16, 14:05 UTCJul 16, 21:10 UTC7h 5m
2026-07-16 UAL980 - Jul 16, 01:50 UTCJul 16, 08:25 UTC6h 35m
2026-07-15 UAL770 BCN → ORD Jul 15, 13:41 UTCJul 15, 22:01 UTC8h 20m
2026-07-15 UAL770 BCN → ORD Jul 15, 13:41 UTCJul 15, 22:03 UTC8h 22m
2026-07-15 UAL770 - Jul 15, 13:35 UTCJul 15, 20:15 UTC6h 40m
2026-07-15 UAL769 - Jul 15, 03:35 UTCJul 15, 11:20 UTC7h 45m
2026-07-15 UAL769 ORD → BCN Jul 15, 03:13 UTCJul 15, 11:14 UTC8h 1m
2026-07-14 UAL952 - Jul 14, 09:55 UTCJul 14, 12:05 UTC2h 10m
2026-07-14 UAL952 MUC → ORD Jul 14, 09:47 UTCJul 14, 18:18 UTC8h 31m
2026-07-14 UAL952 MUC → ORD Jul 14, 09:47 UTCJul 14, 18:35 UTC8h 48m
2026-07-13 UAL108 IAD → MUC Jul 13, 21:50 UTCJul 14, 05:30 UTC7h 40m
2026-07-12 UAL997 ACC → IAD Jul 12, 22:38 UTCJul 13, 08:34 UTC9h 56m
2026-07-12 UAL997 ACC → IAD Jul 12, 22:38 UTCJul 13, 08:31 UTC9h 53m
2026-07-11 UAL996 IAD → ACC Jul 11, 23:06 UTCJul 12, 08:57 UTC9h 51m
2026-07-11 UAL996 - Jul 11, 23:20 UTCJul 12, 00:15 UTC55m
2026-07-11 UAL991 BCN → IAD Jul 11, 09:25 UTCJul 11, 17:35 UTC8h 10m
2026-07-10 UAL992 IAD → BCN Jul 10, 23:11 UTCJul 11, 06:25 UTC7h 14m
2026-07-10 UAL992 IAD → BCN Jul 10, 23:15 UTCJul 11, 06:30 UTC7h 15m
2026-07-09 UAL613 - Jul 9, 02:25 UTCJul 9, 09:50 UTC7h 25m
2026-07-09 UAL61 MEL → SFO Jul 9, 01:09 UTCJul 9, 14:23 UTC13h 14m
2026-07-08 UAL613 - Jul 8, 10:40 UTCJul 9, 09:50 UTC23h 10m
2026-07-08 UAL612 - Jul 8, 04:20 UTCJul 9, 02:45 UTC22h 25m
2026-07-08 UAL612 IAD → LOS Jul 8, 03:59 UTCJul 8, 14:06 UTC10h 7m
2026-07-08 UAL612 - Jul 8, 04:05 UTCJul 8, 11:40 UTC7h 35m
2026-07-07 UAL613 - Jul 7, 02:55 UTCJul 7, 03:05 UTC10m
2026-07-06 UAL613 LOS → IAD Jul 6, 23:15 UTCJul 7, 10:39 UTC11h 24m
2026-07-06 UAL613 - Jul 6, 12:25 UTCJul 7, 10:40 UTC22h 15m
2026-07-06 UAL612 - Jul 6, 06:20 UTCJul 7, 03:05 UTC20h 45m
2026-07-06 UAL612 IAD → LOS Jul 6, 05:48 UTCJul 6, 15:42 UTC9h 54m
2026-07-06 UAL612 - Jul 6, 05:50 UTCJul 6, 13:25 UTC7h 35m
2026-07-05 UAL983 ATH → IAD Jul 5, 13:55 UTCJul 6, 00:00 UTC10h 5m
2026-07-05 UAL982 IAD → ATH Jul 5, 02:50 UTCJul 5, 11:45 UTC8h 55m

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 N45905 page for operator, model, and routing details .

Mode-S A59601 frequently asked

What is Mode-S code A59601?
A59601 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N45905.
Where is Mode-S A59601 registered?
Mode-S code A59601 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 A59601 broadcasting right now?
Yes. Mode-S A59601 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A59601, octal 51313001, decimal 10,851,841.
What flights does A59601 operate?
Mode-S A59601 has broadcast 20 distinct callsigns, including UAL997, UAL613, UAL996, UAL612, UAL981.