Apparatus

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sensors Mode-S transponder

A677CA

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N516AS · BOEING 737-800 · operated by WILMINGTON TRUST CO TRUSTEE

Hex
A677CA
Octal
51473712
Decimal
10,909,642
Country
US
Tail
N516AS
Type
B738
No current signal · last broadcast 4h ago
Flights observed
211
Distinct callsigns
20
Country
US
Last broadcast
4h ago

Last known position

Most recent position reported by Mode-S A677CA.

Country allocation

The ICAO 24-bit address A677CA 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
ASA67 Alaska Airlines 5 2026-05-06
ASA525 Alaska Airlines 4 2026-05-31
ASA9 Alaska Airlines 3 2026-05-11
ASA69 Alaska Airlines 3 2026-05-20
ASA60 Alaska Airlines 3 2026-05-26
ASA585 Alaska Airlines 3 2026-05-01
ASA564 Alaska Airlines 3 2026-05-24
ASA534 Alaska Airlines 3 2026-06-05
ASA4 Alaska Airlines 3 2026-05-11
ASA232 Alaska Airlines 3 2026-06-08
ASA217 Alaska Airlines 3 2026-05-09
ASA1456 Alaska Airlines 3 2026-04-28
ASA1357 Alaska Airlines 3 2026-05-31
ASA95 Alaska Airlines 2 2026-05-19
ASA796 Alaska Airlines 2 2026-05-05
ASA773 Alaska Airlines 2 2026-06-06
ASA760 Alaska Airlines 2 2026-05-31
ASA736 Alaska Airlines 2 2026-05-17
ASA702 Alaska Airlines 2 2026-05-29
ASA697 Alaska Airlines 2 2026-05-06

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-09 ASA1307 ONT → PDX Jun 9, 02:35 UTCJun 9, 04:40 UTC2h 5m
2026-06-08 ASA1486 SEA → BUR Jun 8, 21:26 UTCJun 9, 00:25 UTC2h 59m
2026-06-08 ASA1486 SEA → BUR Jun 8, 21:20 UTCJun 9, 00:30 UTC3h 10m
2026-06-08 ASA232 SEA → SJC Jun 8, 17:40 UTCJun 8, 18:30 UTC50m
2026-06-08 ASA231 LAS → SFO Jun 8, 15:55 UTCJun 8, 16:41 UTC46m
2026-06-08 ASA231 LAS → SFO Jun 8, 15:55 UTCJun 8, 16:35 UTC40m
2026-06-07 ASA51 ANC → BRW Jun 7, 22:25 UTCJun 8, 02:35 UTC4h 10m
2026-06-07 ASA1451 SFO → LAX Jun 7, 17:30 UTCJun 7, 20:35 UTC3h 5m
2026-06-07 ASA1380 PDX → CUN Jun 7, 12:30 UTCJun 7, 16:10 UTC3h 40m
2026-06-07 ASA1381 CUN → PDX Jun 7, 01:30 UTCJun 7, 04:50 UTC3h 20m
2026-06-06 ASA506 SEA → BOS Jun 6, 23:09 UTCJun 7, 00:19 UTC1h 10m
2026-06-06 ASA452 ORD → SFO Jun 6, 20:45 UTCJun 6, 21:04 UTC20m
2026-06-06 ASA452 ORD → SFO Jun 6, 19:30 UTCJun 6, 20:14 UTC45m
2026-06-06 ASA759 SFO → LAS Jun 6, 15:59 UTCJun 6, 18:25 UTC2h 25m
2026-06-06 ASA1310 SFO → DAL Jun 6, 04:15 UTCJun 6, 06:30 UTC2h 15m
2026-06-06 ASA773 EWR → SAN Jun 6, 01:00 UTCJun 6, 03:20 UTC2h 20m
2026-06-05 ASA316 MIA → PDX Jun 5, 21:30 UTCJun 5, 23:30 UTC2h 0m
2026-06-05 ASA316 MIA → PDX Jun 5, 18:00 UTCJun 5, 20:05 UTC2h 5m
2026-06-05 ASA534 SFO → AUS Jun 5, 11:35 UTCJun 5, 15:20 UTC3h 45m
2026-06-05 ASA426 SEA → JFK Jun 5, 06:40 UTCJun 5, 10:00 UTC3h 20m
2026-06-04 ASA572 RDU → SEA Jun 4, 23:40 UTCJun 5, 05:05 UTC5h 25m
2026-06-04 ASA572 RDU → SEA Jun 4, 17:25 UTCJun 4, 22:05 UTC4h 40m
2026-06-04 ASA534 SFO → AUS Jun 4, 11:40 UTCJun 4, 15:20 UTC3h 40m
2026-06-04 ASA426 SEA → JFK Jun 4, 06:25 UTCJun 4, 09:45 UTC3h 20m
2026-06-03 ASA698 SEA → PHX Jun 3, 23:05 UTCJun 4, 01:30 UTC2h 25m
2026-06-03 ASA480 SEA → MSP Jun 3, 19:50 UTCJun 3, 21:35 UTC1h 45m
2026-06-03 ASA476 SEA → LAX Jun 3, 16:57 UTCJun 3, 18:47 UTC1h 50m
2026-06-03 ASA476 SEA → LAX Jun 3, 16:40 UTCJun 3, 18:45 UTC2h 5m
2026-06-03 ASA1338 LAS → SJD Jun 3, 04:00 UTCJun 3, 06:00 UTC2h 0m
2026-06-03 ASA758 SFO → SEA Jun 3, 01:05 UTCJun 3, 02:55 UTC1h 50m
2026-06-02 ASA236 SFO → LAS Jun 2, 22:16 UTCJun 2, 23:34 UTC1h 18m
2026-06-02 ASA236 SFO → LAS Jun 2, 22:20 UTCJun 2, 23:40 UTC1h 20m
2026-06-02 ASA235 GDL → SJC Jun 2, 19:50 UTCJun 2, 21:10 UTC1h 20m
2026-06-02 ASA725 LAS → PDX Jun 2, 16:55 UTCJun 2, 18:35 UTC1h 40m
2026-06-02 ASA687 LAS → PDX Jun 2, 02:30 UTCJun 2, 04:40 UTC2h 10m
2026-06-02 ASA687 LAS → PDX Jun 2, 02:30 UTCJun 2, 04:45 UTC2h 15m
2026-06-01 ASA686 SFO → LAS Jun 1, 23:25 UTCJun 2, 01:25 UTC2h 0m
2026-06-01 ASA357 BOS → SFO Jun 1, 20:00 UTCJun 1, 20:45 UTC45m
2026-06-01 ASA250 PDX → GEG Jun 1, 17:40 UTCJun 1, 18:25 UTC45m
2026-06-01 ASA250 PDX → GEG Jun 1, 17:38 UTCJun 1, 18:24 UTC46m
2026-06-01 ASA750 SNA → PDX Jun 1, 14:20 UTCJun 1, 16:25 UTC2h 5m
2026-06-01 ASA1387 PVR → SFO Jun 1, 03:05 UTCJun 1, 05:20 UTC2h 15m
2026-05-31 ASA760 SNA → SEA May 31, 22:40 UTCJun 1, 00:55 UTC2h 15m
2026-05-31 ASA760 SNA → SEA May 31, 22:53 UTCJun 1, 00:52 UTC1h 59m
2026-05-31 ASA1357 PVR → SFO May 31, 19:10 UTCMay 31, 21:20 UTC2h 10m
2026-05-31 ASA1357 PVR → SFO May 31, 19:07 UTCMay 31, 21:21 UTC2h 14m
2026-05-31 ASA525 LAX → SEA May 31, 15:20 UTCMay 31, 17:40 UTC2h 20m
2026-05-31 ASA525 LAX → SEA May 31, 15:18 UTCMay 31, 17:26 UTC2h 8m
2026-05-31 ASA711 SEA → OAK May 31, 01:10 UTCMay 31, 01:11 UTC1m
2026-05-30 ASA325 ORD → PDX May 30, 19:35 UTCMay 30, 23:05 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 N516AS page for operator, model, and routing details .

Mode-S A677CA frequently asked

What is Mode-S code A677CA?
A677CA is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N516AS.
Where is Mode-S A677CA registered?
Mode-S code A677CA 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 A677CA broadcasting right now?
No active broadcast right now. Last signal was 4h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A677CA, octal 51473712, decimal 10,909,642.
What flights does A677CA operate?
Mode-S A677CA has broadcast 20 distinct callsigns, including ASA67, ASA525, ASA9, ASA69, ASA60.