Apparatus

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sensors Mode-S transponder

A1C557

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N213HA · AIRBUS A-321neo · operated by UMB BANK NA TRUSTEE

Hex
A1C557
Octal
50342527
Decimal
10,601,815
Country
US
Tail
N213HA
Type
A21N
No current signal · last broadcast 9h ago
Flights observed
129
Distinct callsigns
20
Country
US
Last broadcast
9h ago

Last known position

Most recent position reported by Mode-S A1C557.

Country allocation

The ICAO 24-bit address A1C557 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
ASA868 Alaska Airlines 9 2026-05-24
ASA968 Alaska Airlines 8 2026-05-21
ASA963 Alaska Airlines 8 2026-05-20
ASA878 Alaska Airlines 7 2026-05-25
ASA867 Alaska Airlines 7 2026-05-24
ASA967 Alaska Airlines 6 2026-05-17
ASA844 Alaska Airlines 6 2026-05-23
ASA964 Alaska Airlines 5 2026-05-18
ASA888 Alaska Airlines 5 2026-05-18
ASA870 Alaska Airlines 5 2026-05-05
ASA848 Alaska Airlines 4 2026-05-14
ASA843 Alaska Airlines 4 2026-05-23
ASA826 Alaska Airlines 4 2026-05-12
ASA904 Alaska Airlines 3 2026-05-15
ASA873 Alaska Airlines 3 2026-04-14
ASA1136 Alaska Airlines 3 2026-04-20
ASA924 Alaska Airlines 2 2026-05-26
ASA923 Alaska Airlines 2 2026-05-27
ASA907 Alaska Airlines 2 2026-05-13
ASA903 Alaska Airlines 2 2026-05-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 ASA959 SEA → GEG May 29, 15:45 UTCMay 29, 16:20 UTC35m
2026-05-29 ASA960 SEA → GEG May 29, 01:55 UTCMay 29, 02:40 UTC45m
2026-05-28 ASA931 RNO → SEA May 28, 14:55 UTCMay 28, 15:55 UTC1h 0m
2026-05-28 ASA932 SEA → ABQ May 28, 01:20 UTCMay 28, 02:15 UTC55m
2026-05-27 ASA923 OAK → OGG May 27, 14:30 UTCMay 27, 14:55 UTC25m
2026-05-26 ASA924 RDM → SEA May 26, 16:30 UTCMay 27, 04:09 UTC11h 40m
2026-05-26 ASA972 SEA → YYZ May 26, 02:49 UTCMay 26, 03:19 UTC30m
2026-05-25 ASA9916 SMF → OGG May 25, 20:34 UTCMay 25, 20:55 UTC20m
2026-05-25 ASA898 OGG → PDX May 25, 04:35 UTCMay 25, 09:30 UTC4h 55m
2026-05-25 ASA878 OGG → SFO May 25, 02:05 UTCMay 25, 02:40 UTC35m
2026-05-24 ASA878 OGG → SFO May 24, 21:30 UTCMay 24, 21:45 UTC15m
2026-05-24 ASA867 PDX → KOA May 24, 18:45 UTCMay 24, 19:05 UTC20m
2026-05-24 ASA867 PDX → KOA May 24, 13:15 UTCMay 24, 15:00 UTC1h 45m
2026-05-24 ASA868 KOA → PDX May 24, 03:05 UTCMay 24, 04:50 UTC1h 45m
2026-05-23 ASA868 KOA → PDX May 23, 22:55 UTCMay 23, 23:15 UTC20m
2026-05-23 ASA843 SFO → LAX May 23, 09:45 UTCMay 23, 10:00 UTC15m
2026-05-23 ASA843 SFO → LAX May 23, 04:40 UTCMay 23, 05:35 UTC55m
2026-05-23 ASA844 LAX → PDX May 23, 01:50 UTCMay 23, 02:40 UTC50m
2026-05-22 ASA844 LAX → PDX May 22, 21:10 UTCMay 22, 21:30 UTC20m
2026-05-22 ASA843 SFO → LAX May 22, 05:10 UTCMay 22, 10:25 UTC5h 15m
2026-05-22 ASA844 LAX → PDX May 22, 02:05 UTCMay 22, 03:00 UTC55m
2026-05-21 ASA844 LAX → PDX May 21, 21:30 UTCMay 21, 21:45 UTC15m
2026-05-21 ASA847 OAK → HNL May 21, 14:10 UTCMay 21, 18:55 UTC4h 45m
2026-05-21 ASA968 LIH → OAK May 21, 00:15 UTCMay 21, 05:15 UTC5h 0m
2026-05-20 ASA963 GEG → SEA May 20, 17:05 UTCMay 20, 22:05 UTC5h 0m
2026-05-19 ASA878 OGG → SFO May 19, 21:25 UTCMay 20, 02:25 UTC5h 0m
2026-05-19 ASA867 PDX → KOA May 19, 19:15 UTCMay 19, 19:35 UTC20m
2026-05-19 ASA867 PDX → KOA May 19, 13:30 UTCMay 19, 15:00 UTC1h 30m
2026-05-19 ASA868 KOA → PDX May 19, 03:15 UTCMay 19, 04:55 UTC1h 40m
2026-05-18 ASA868 KOA → PDX May 18, 23:00 UTCMay 18, 23:20 UTC20m
2026-05-18 ASA888 HNL → SEA May 18, 15:45 UTCMay 18, 21:05 UTC5h 19m
2026-05-18 ASA964 GEG → SEA May 18, 04:51 UTCMay 18, 05:45 UTC55m
2026-05-17 ASA967 OAK → LIH May 17, 17:20 UTCMay 17, 17:50 UTC30m
2026-05-17 ASA968 LIH → OAK May 17, 04:35 UTCMay 17, 05:10 UTC35m
2026-05-16 ASA963 GEG → SEA May 16, 17:10 UTCMay 16, 17:55 UTC45m
2026-05-16 ASA897 SAN → KOA May 16, 09:56 UTCMay 16, 14:51 UTC4h 55m
2026-05-16 ASA903 PVR → SEA May 16, 06:10 UTCMay 16, 06:35 UTC25m
2026-05-16 ASA903 PVR → SEA May 16, 00:55 UTCMay 16, 01:40 UTC45m
2026-05-15 ASA904 SEA → BZN May 15, 17:45 UTCMay 15, 23:05 UTC5h 20m
2026-05-15 ASA843 SFO → LAX May 15, 04:20 UTCMay 15, 10:20 UTC6h 0m
2026-05-15 ASA844 LAX → PDX May 15, 01:35 UTCMay 15, 02:40 UTC1h 5m
2026-05-14 ASA844 LAX → PDX May 14, 21:25 UTCMay 14, 21:40 UTC15m
2026-05-14 ASA847 OAK → HNL May 14, 14:20 UTCMay 14, 19:30 UTC5h 10m
2026-05-14 ASA848 HNL → SEA May 14, 03:25 UTCMay 14, 04:05 UTC40m
2026-05-13 ASA848 HNL → SEA May 13, 23:15 UTCMay 13, 23:30 UTC15m
2026-05-13 ASA907 RDM → SEA May 13, 21:05 UTCMay 13, 21:20 UTC15m
2026-05-13 ASA907 RDM → SEA May 13, 15:55 UTCMay 13, 16:45 UTC50m
2026-05-12 ASA826 LIH → SAN May 12, 22:20 UTCMay 12, 23:10 UTC50m
2026-05-12 ASA826 LIH → SAN May 12, 18:00 UTCMay 12, 18:15 UTC15m
2026-05-11 ASA846 GEG → SEA May 11, 22:35 UTCMay 12, 06:45 UTC8h 11m

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 N213HA page for operator, model, and routing details .

Mode-S A1C557 frequently asked

What is Mode-S code A1C557?
A1C557 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N213HA.
Where is Mode-S A1C557 registered?
Mode-S code A1C557 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 A1C557 broadcasting right now?
No active broadcast right now. Last signal was 9h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A1C557, octal 50342527, decimal 10,601,815.
What flights does A1C557 operate?
Mode-S A1C557 has broadcast 20 distinct callsigns, including ASA868, ASA968, ASA963, ASA878, ASA867.