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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 Jul 26, 20:50 UTC
Flights observed
298
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 20:50 UTC

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
ASA870 - 12 2026-07-18
ASA844 - 12 2026-06-28
ASA843 - 11 2026-06-20
ASA968 - 10 2026-06-18
ASA963 Alaska Airlines 10 2026-06-18
ASA869 Alaska Airlines 10 2026-07-22
ASA883 Alaska Airlines 9 2026-07-26
ASA868 Alaska Airlines 9 2026-05-24
ASA967 - 8 2026-06-17
ASA884 Alaska Airlines 8 2026-07-25
ASA848 Alaska Airlines 8 2026-06-05
ASA964 - 7 2026-06-17
ASA880 Alaska Airlines 7 2026-07-25
ASA878 Alaska Airlines 7 2026-05-25
ASA867 Alaska Airlines 7 2026-05-24
ASA923 Alaska Airlines 6 2026-06-19
ASA839 Alaska Airlines 6 2026-07-23
ASA972 Alaska Airlines 5 2026-07-22
ASA924 - 5 2026-06-17
ASA904 Alaska Airlines 5 2026-06-07

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ASA883 SAN → FLL Jul 26, 15:35 UTCJul 26, 20:50 UTC5h 15m
2026-07-25 ASA884 FLL → SAN Jul 25, 22:35 UTCJul 26, 03:35 UTC5h 0m
2026-07-25 ASA883 SAN → FLL Jul 25, 15:20 UTCJul 25, 20:45 UTC5h 25m
2026-07-25 ASA880 KOA → SEA Jul 25, 12:25 UTCJul 25, 13:10 UTC45m
2026-07-25 ASA880 KOA → SEA Jul 25, 08:20 UTCJul 25, 08:35 UTC15m
2026-07-25 ASA894 KOA → SAN Jul 25, 00:45 UTCJul 25, 06:10 UTC5h 25m
2026-07-24 ASA892 HNL → SAN Jul 24, 22:25 UTCJul 24, 23:05 UTC40m
2026-07-24 ASA892 HNL → SAN Jul 24, 17:55 UTCJul 24, 18:15 UTC20m
2026-07-24 ASA841 SFO → LAX Jul 24, 06:10 UTCJul 24, 06:25 UTC15m
2026-07-24 ASA841 SFO → LAX Jul 24, 01:00 UTCJul 24, 01:55 UTC55m
2026-07-23 ASA840 BOS → SEA Jul 23, 22:10 UTCJul 23, 23:05 UTC55m
2026-07-23 ASA840 BOS → SEA Jul 23, 18:05 UTCJul 23, 18:20 UTC15m
2026-07-23 ASA855 SEA → SJC Jul 23, 09:55 UTCJul 23, 10:15 UTC20m
2026-07-23 ASA855 SEA → SJC Jul 23, 04:50 UTCJul 23, 05:40 UTC50m
2026-07-23 ASA839 SEA → LIH Jul 23, 01:40 UTCJul 23, 02:40 UTC1h 0m
2026-07-22 ASA839 SEA → LIH Jul 22, 21:30 UTCJul 22, 21:45 UTC15m
2026-07-22 ASA869 SJC → KOA Jul 22, 14:10 UTCJul 22, 19:40 UTC5h 30m
2026-07-22 ASA972 SEA → YYZ Jul 22, 02:30 UTCJul 22, 03:05 UTC35m
2026-07-21 ASA959 SEA → GEG Jul 21, 15:45 UTCJul 21, 16:25 UTC40m
2026-07-21 ASA960 SEA → GEG Jul 21, 01:30 UTCJul 21, 02:25 UTC55m
2026-07-20 ASA931 - Jul 20, 14:30 UTCJul 20, 15:50 UTC1h 20m
2026-07-20 ASA932 SEA → ABQ Jul 20, 00:30 UTCJul 20, 02:10 UTC1h 40m
2026-07-19 ASA953 - Jul 19, 14:15 UTCJul 19, 14:55 UTC40m
2026-07-19 ASA954 - Jul 19, 01:55 UTCJul 19, 02:45 UTC50m
2026-07-18 ASA971 SFO → SEA Jul 18, 15:25 UTCJul 18, 16:00 UTC35m
2026-07-18 ASA870 - Jul 18, 03:00 UTCJul 18, 03:35 UTC35m
2026-07-17 ASA870 - Jul 17, 22:45 UTCJul 17, 23:05 UTC20m
2026-07-17 ASA869 - Jul 17, 19:09 UTCJul 17, 19:35 UTC25m
2026-07-17 ASA869 - Jul 17, 14:15 UTCJul 17, 14:50 UTC35m
2026-07-17 ASA870 - Jul 17, 02:59 UTCJul 17, 03:34 UTC35m
2026-07-16 ASA870 - Jul 16, 22:45 UTCJul 16, 23:05 UTC20m
2026-07-16 ASA879 - Jul 16, 20:29 UTCJul 16, 20:49 UTC20m
2026-07-16 ASA879 - Jul 16, 15:10 UTCJul 16, 16:05 UTC55m
2026-07-16 ASA880 - Jul 16, 12:09 UTCJul 16, 13:00 UTC50m
2026-07-16 ASA880 - Jul 16, 08:00 UTCJul 16, 08:15 UTC15m
2026-07-15 ASA9295 - Jul 15, 17:10 UTCJul 15, 22:35 UTC5h 25m
2026-07-14 ASA9296 - Jul 14, 23:00 UTCJul 15, 04:00 UTC5h 0m
2026-07-14 ASA869 - Jul 14, 14:10 UTCJul 14, 19:35 UTC5h 25m
2026-07-14 ASA870 - Jul 14, 03:00 UTCJul 14, 03:35 UTC35m
2026-07-13 ASA870 - Jul 13, 22:40 UTCJul 13, 22:55 UTC15m
2026-07-13 ASA879 - Jul 13, 20:00 UTCJul 13, 20:25 UTC25m
2026-07-13 ASA879 - Jul 13, 15:05 UTCJul 13, 15:55 UTC50m
2026-07-12 ASA884 - Jul 12, 22:40 UTCJul 13, 03:50 UTC5h 10m
2026-07-12 ASA883 - Jul 12, 15:35 UTCJul 12, 20:50 UTC5h 15m
2026-07-12 ASA880 - Jul 12, 12:15 UTCJul 12, 13:01 UTC45m
2026-07-12 ASA880 - Jul 12, 07:50 UTCJul 12, 08:05 UTC15m
2026-07-12 ASA896 - Jul 12, 03:25 UTCJul 12, 03:50 UTC25m
2026-07-11 ASA895 - Jul 11, 03:05 UTCJul 11, 03:40 UTC35m
2026-07-10 ASA869 - Jul 10, 14:20 UTCJul 10, 19:50 UTC5h 30m
2026-07-09 ASA870 - Jul 9, 22:40 UTCJul 10, 03:25 UTC4h 45m

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 Jul 26, 20:50 UTC.
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 ASA870, ASA844, ASA843, ASA968, ASA963.