Apparatus

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sensors Mode-S transponder

A6BF5A

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N534AS · BOEING 737-800 · operated by ALASKA AIRLINES INC

Hex
A6BF5A
Octal
51537532
Decimal
10,927,962
Country
US
Tail
N534AS
Type
B738
No current signal · last broadcast 1h ago
Flights observed
122
Distinct callsigns
20
Country
US
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S A6BF5A.

Country allocation

The ICAO 24-bit address A6BF5A 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
ASA5 Alaska Airlines 4 2026-05-11
ASA572 Alaska Airlines 3 2026-06-05
ASA565 Alaska Airlines 3 2026-05-31
ASA433 Alaska Airlines 3 2026-05-10
ASA312 Alaska Airlines 3 2026-06-02
ASA264 Alaska Airlines 3 2026-05-15
ASA237 Alaska Airlines 3 2026-06-02
ASA10 Alaska Airlines 3 2026-05-15
ASA1 Alaska Airlines 3 2026-05-13
ASA741 Alaska Airlines 2 2026-05-28
ASA712 Alaska Airlines 2 2026-05-16
ASA699 Alaska Airlines 2 2026-06-07
ASA686 Alaska Airlines 2 2026-04-25
ASA668 Alaska Airlines 2 2026-05-16
ASA639 Alaska Airlines 2 2026-05-10
ASA634 Alaska Airlines 2 2026-05-12
ASA588 Alaska Airlines 2 2026-05-16
ASA376 Alaska Airlines 2 2026-06-03
ASA3 Alaska Airlines 2 2026-05-15
ASA238 Alaska Airlines 2 2026-06-09

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-10 ASA1679 SJC → PDX Jun 10, 15:10 UTCJun 10, 16:30 UTC1h 20m
2026-06-10 ASA1303 SJD → PDX Jun 10, 01:13 UTCJun 10, 02:33 UTC1h 20m
2026-06-10 ASA1303 SJD → PDX Jun 10, 01:00 UTCJun 10, 02:35 UTC1h 35m
2026-06-09 ASA641 TUS → SEA Jun 9, 20:30 UTCJun 9, 23:25 UTC2h 55m
2026-06-09 ASA648 SEA → TUS Jun 9, 16:50 UTCJun 9, 19:35 UTC2h 45m
2026-06-09 ASA259 SJD → SJC Jun 9, 07:55 UTCJun 9, 13:10 UTC5h 15m
2026-06-09 ASA238 SFO → LAS Jun 9, 04:40 UTCJun 9, 04:55 UTC15m
2026-06-08 ASA238 SFO → LAS Jun 8, 23:15 UTCJun 8, 23:55 UTC40m
2026-06-08 ASA1483 SFO → SEA Jun 8, 17:30 UTCJun 8, 20:40 UTC3h 10m
2026-06-08 ASA1483 SFO → SEA Jun 8, 17:27 UTCJun 8, 20:28 UTC3h 1m
2026-06-08 ASA224 ANC → PHX Jun 8, 15:00 UTCJun 8, 15:45 UTC45m
2026-06-08 ASA431 LAX → SEA Jun 8, 02:35 UTCJun 8, 03:15 UTC40m
2026-06-07 ASA772 SAN → EWR Jun 7, 21:40 UTCJun 8, 00:50 UTC3h 10m
2026-06-07 ASA1405 BZE → SEA Jun 7, 18:15 UTCJun 7, 20:20 UTC2h 5m
2026-06-07 ASA699 SFO → PHX Jun 7, 14:40 UTCJun 7, 16:50 UTC2h 10m
2026-06-07 ASA98 ADQ → ANC Jun 7, 10:05 UTCJun 7, 13:05 UTC3h 0m
2026-06-06 ASA413 SFO → LAS Jun 6, 07:30 UTCJun 6, 10:30 UTC3h 0m
2026-06-05 ASA572 RDU → SEA Jun 5, 23:35 UTCJun 6, 04:50 UTC5h 15m
2026-06-05 ASA572 RDU → SEA Jun 5, 23:33 UTCJun 6, 04:41 UTC5h 8m
2026-06-05 ASA572 RDU → SEA Jun 5, 17:25 UTCJun 5, 21:55 UTC4h 30m
2026-06-04 ASA291 MCI → SEA Jun 4, 00:20 UTCJun 4, 03:50 UTC3h 30m
2026-06-03 ASA376 SFO → LAX Jun 3, 19:30 UTCJun 3, 22:50 UTC3h 20m
2026-06-03 ASA376 SFO → LAX Jun 3, 19:29 UTCJun 3, 22:48 UTC3h 19m
2026-06-03 ASA702 LAX → LAS Jun 3, 15:10 UTCJun 3, 17:45 UTC2h 35m
2026-06-03 ASA1307 ONT → PDX Jun 3, 02:10 UTCJun 3, 04:15 UTC2h 5m
2026-06-02 ASA312 SEA → OMA Jun 2, 20:05 UTCJun 2, 23:05 UTC3h 0m
2026-06-02 ASA312 SEA → OMA Jun 2, 16:00 UTCJun 2, 18:50 UTC2h 50m
2026-06-02 ASA213 LAX → IAD Jun 2, 13:10 UTCJun 2, 13:50 UTC40m
2026-06-02 ASA237 LAS → SFO Jun 2, 01:25 UTCJun 2, 02:20 UTC55m
2026-06-02 ASA237 LAS → SFO Jun 2, 01:22 UTCJun 2, 06:55 UTC5h 33m
2026-06-01 ASA506 SEA → BOS Jun 1, 22:30 UTCJun 1, 23:30 UTC1h 0m
2026-06-01 ASA452 ORD → SFO Jun 1, 19:25 UTCJun 1, 21:05 UTC1h 40m
2026-06-01 ASA759 SFO → LAS Jun 1, 16:00 UTCJun 1, 18:15 UTC2h 15m
2026-06-01 ASA237 LAS → SFO Jun 1, 01:43 UTCJun 1, 07:13 UTC5h 30m
2026-06-01 ASA213 LAX → IAD Jun 1, 01:45 UTCJun 1, 13:50 UTC12h 5m
2026-05-31 ASA565 LAX → PDX May 31, 22:10 UTCMay 31, 23:45 UTC1h 35m
2026-05-31 ASA565 LAX → PDX May 31, 22:13 UTCMay 31, 23:35 UTC1h 22m
2026-05-31 ASA565 LAX → PDX May 31, 19:05 UTCMay 31, 20:30 UTC1h 25m
2026-05-31 ASA1325 SNA → SEA May 31, 15:25 UTCMay 31, 17:40 UTC2h 15m
2026-05-30 ASA557 PDX → LAX May 30, 21:15 UTCMay 31, 01:11 UTC3h 56m
2026-05-30 ASA11 BOS → SFO May 30, 15:00 UTCMay 30, 19:55 UTC4h 55m
2026-05-29 ASA9 DCA → PDX May 29, 21:40 UTCMay 30, 02:25 UTC4h 45m
2026-05-29 ASA4 SEA → DCA May 29, 15:20 UTCMay 29, 20:00 UTC4h 40m
2026-05-29 ASA1342 PVR → SFO May 29, 01:20 UTCMay 29, 03:40 UTC2h 20m
2026-05-28 ASA741 LAS → SEA May 28, 21:49 UTCMay 28, 23:42 UTC1h 53m
2026-05-28 ASA741 LAS → SEA May 28, 21:30 UTCMay 28, 23:55 UTC2h 25m
2026-05-28 ASA9440 GSO → TPA May 28, 15:15 UTCMay 28, 20:05 UTC4h 50m
2026-05-17 ASA9423 SEA → GSO May 17, 17:50 UTCMay 17, 22:15 UTC4h 25m
2026-05-17 ASA1366 SJD → LAX May 17, 03:35 UTCMay 17, 05:20 UTC1h 45m
2026-05-17 ASA366 MKE → SEA May 17, 01:15 UTCMay 17, 02:25 UTC1h 10m

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 N534AS page for operator, model, and routing details .

Mode-S A6BF5A frequently asked

What is Mode-S code A6BF5A?
A6BF5A is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N534AS.
Where is Mode-S A6BF5A registered?
Mode-S code A6BF5A 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 A6BF5A broadcasting right now?
No active broadcast right now. Last signal was 1h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A6BF5A, octal 51537532, decimal 10,927,962.
What flights does A6BF5A operate?
Mode-S A6BF5A has broadcast 20 distinct callsigns, including ASA5, ASA572, ASA565, ASA433, ASA312.