Apparatus

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sensors Mode-S transponder

A6A1B4

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N5261A · BOEING 737-800 · operated by BANK OF UTAH TRUSTEE

Hex
A6A1B4
Octal
51520664
Decimal
10,920,372
Country
US
Tail
N5261A
Type
B738
No current signal · last broadcast 5h ago
Flights observed
272
Distinct callsigns
20
Country
US
Last broadcast
5h ago

Last known position

Most recent position reported by Mode-S A6A1B4.

Country allocation

The ICAO 24-bit address A6A1B4 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
SCX3034 - 9 2026-07-09
SCX3050 - 8 2026-07-06
SCX3048 - 8 2026-07-01
SCX3038 - 8 2026-06-21
SCX3033 - 8 2026-07-13
SCX3056 - 6 2026-06-20
SCX3055 - 6 2026-06-22
SCX3054 Sun Country Airlines 6 2026-05-27
SCX3039 Sun Country Airlines 6 2026-05-26
SCX3081 - 5 2026-06-19
SCX3061 Sun Country Airlines 5 2026-05-26
SCX3057 - 5 2026-06-28
SCX3043 - 5 2026-06-21
SCX3029 - 5 2026-07-03
SCX3022 - 5 2026-06-28
SCX3018 - 5 2026-07-06
SCX3012 Sun Country Airlines 5 2026-05-26
SCX3099 - 4 2026-06-29
SCX3098 Sun Country Airlines 4 2026-06-21
SCX3094 - 4 2026-07-03

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 SX3089 CVG → MSP Jul 14, 04:50 UTCJul 14, 06:10 UTC1h 20m
2026-07-13 SCX3033 MSP → CVG Jul 13, 22:20 UTCJul 13, 23:40 UTC1h 20m
2026-07-10 SCX3089 - Jul 10, 05:05 UTCJul 10, 06:45 UTC1h 40m
2026-07-09 SCX3034 - Jul 9, 22:15 UTCJul 9, 23:25 UTC1h 10m
2026-07-09 SCX3091 - Jul 9, 18:55 UTCJul 9, 20:10 UTC1h 15m
2026-07-09 SCX3086 ABQ → CVG Jul 9, 07:35 UTCJul 9, 10:20 UTC2h 45m
2026-07-09 SCX3067 - Jul 9, 04:40 UTCJul 9, 05:55 UTC1h 15m
2026-07-08 SCX3071 LAS → AFW Jul 8, 23:15 UTCJul 9, 01:25 UTC2h 10m
2026-07-08 SCX3093 - Jul 8, 19:10 UTCJul 8, 21:25 UTC2h 15m
2026-07-06 SCX3050 - Jul 6, 08:05 UTCJul 6, 10:10 UTC2h 5m
2026-07-06 SCX3018 - Jul 6, 03:35 UTCJul 6, 04:30 UTC55m
2026-07-04 SCX3044 - Jul 4, 18:40 UTCJul 4, 20:05 UTC1h 25m
2026-07-04 SCX3082 CVG → LAL Jul 4, 05:05 UTCJul 4, 06:45 UTC1h 40m
2026-07-04 SCX6010 - Jul 4, 00:55 UTCJul 4, 02:40 UTC1h 45m
2026-07-03 SCX3094 - Jul 3, 11:00 UTCJul 3, 13:25 UTC2h 25m
2026-07-03 SCX3029 - Jul 3, 05:00 UTCJul 3, 08:30 UTC3h 30m
2026-07-01 SCX3017 FAI → PDX Jul 1, 22:25 UTCJul 2, 00:05 UTC1h 40m
2026-07-01 SCX3079 - Jul 1, 19:25 UTCJul 1, 21:05 UTC1h 40m
2026-07-01 SCX3013 - Jul 1, 10:00 UTCJul 1, 11:15 UTC1h 15m
2026-07-01 SCX3048 - Jul 1, 04:15 UTCJul 1, 06:15 UTC2h 0m
2026-06-30 SCX3053 - Jun 30, 23:45 UTCJul 1, 01:10 UTC1h 25m
2026-06-30 SCX3003 - Jun 30, 19:10 UTCJun 30, 20:35 UTC1h 25m
2026-06-30 SCX3050 - Jun 30, 08:20 UTCJun 30, 10:25 UTC2h 5m
2026-06-30 SCX3018 - Jun 30, 04:15 UTCJun 30, 05:15 UTC1h 0m
2026-06-29 SCX3001 - Jun 29, 19:44 UTCJun 29, 22:49 UTC3h 5m
2026-06-29 SCX3051 TOL → LAS Jun 29, 12:39 UTCJun 29, 16:29 UTC3h 50m
2026-06-29 SCX3099 - Jun 29, 04:30 UTCJun 29, 06:19 UTC1h 50m
2026-06-28 SCX3071 LAS → AFW Jun 28, 23:34 UTCJun 29, 01:39 UTC2h 5m
2026-06-28 SCX3093 - Jun 28, 19:44 UTCJun 28, 22:04 UTC2h 20m
2026-06-28 SCX3022 - Jun 28, 07:44 UTCJun 28, 09:05 UTC1h 20m
2026-06-28 SCX3057 - Jun 28, 04:59 UTCJun 28, 06:15 UTC1h 15m
2026-06-27 SCX6050 CVG → MSP Jun 27, 06:09 UTCJun 27, 08:39 UTC2h 30m
2026-06-24 SCX3085 MCI → BWI Jun 24, 19:29 UTCJun 24, 21:50 UTC2h 20m
2026-06-24 SCX3050 - Jun 24, 08:09 UTCJun 24, 10:14 UTC2h 5m
2026-06-24 SCX3099 LAL → ORD Jun 24, 04:34 UTCJun 24, 06:29 UTC1h 55m
2026-06-23 SCX3071 BDL → AFW Jun 23, 23:44 UTCJun 24, 02:05 UTC2h 20m
2026-06-23 SCX3093 AUS → PHX Jun 23, 19:15 UTCJun 23, 21:34 UTC2h 20m
2026-06-23 SCX3094 MSP → CVG Jun 23, 11:04 UTCJun 23, 13:29 UTC2h 25m
2026-06-23 SCX3029 - Jun 23, 05:15 UTCJun 23, 08:59 UTC3h 45m
2026-06-23 SCX3029 - Jun 23, 04:50 UTCJun 23, 05:09 UTC20m
2026-06-22 SCX3034 - Jun 22, 22:19 UTCJun 22, 23:29 UTC1h 10m
2026-06-22 SCX3091 BDL → AFW Jun 22, 18:54 UTCJun 22, 20:14 UTC1h 20m
2026-06-22 SCX3055 - Jun 22, 12:59 UTCJun 22, 16:14 UTC3h 15m
2026-06-22 SCX3029 - Jun 22, 05:34 UTCJun 22, 09:19 UTC3h 45m
2026-06-21 SCX3033 MSP → SBD Jun 21, 22:00 UTCJun 21, 23:14 UTC1h 15m
2026-06-21 SCX3043 - Jun 21, 18:50 UTCJun 21, 20:24 UTC1h 35m
2026-06-21 SCX3055 - Jun 21, 13:00 UTCJun 21, 16:04 UTC3h 5m
2026-06-21 SCX3098 STL → CVG Jun 21, 06:29 UTCJun 21, 08:04 UTC1h 35m
2026-06-21 SCX3038 GEG → SBD Jun 21, 00:49 UTCJun 21, 02:55 UTC2h 5m
2026-06-20 SCX3011 SBD → GEG Jun 20, 21:00 UTCJun 20, 23:04 UTC2h 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 N5261A page for operator, model, and routing details .

Mode-S A6A1B4 frequently asked

What is Mode-S code A6A1B4?
A6A1B4 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N5261A.
Where is Mode-S A6A1B4 registered?
Mode-S code A6A1B4 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 A6A1B4 broadcasting right now?
No active broadcast right now. Last signal was 5h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A6A1B4, octal 51520664, decimal 10,920,372.
What flights does A6A1B4 operate?
Mode-S A6A1B4 has broadcast 20 distinct callsigns, including SCX3034, SCX3050, SCX3048, SCX3038, SCX3033.